Portfolio Models Essay Example for Free

Portfolio Models Essay The use of portfolio models in marketing has been gaining increasing use since 1960s. The portfolio models were developed with the aim of helping in the development of market share and growth. These models have been used as strategic thinking model in the making of business decision. These models include BCG, General electric/shell, Hofner-Schendel, Experience Curve and Porters Competitive models. Each model has been criticized on the capabilities and according to its scope on market share. These models have been found to lead to the wrong decision in investment and other business processes. The portfolio models assume a causal relationship between the market share and the profitability of a product in the market. The common scope of portfolio models is the way it tries to ignores some of the most relevant strategic issues in business. Therefore, all models cannot be taken as an effective strategic decision making model. It should however be discarded or it should be used with caution. This paper does not recommend the use of portfolio models and an alternative way should be sought to replace this. Introduction Portfolio models can be defined as a method or strategy in which a new product will be introduced in the market and perform as it was expected. In the 1960s, there was growing assertion of the use of portfolio models in marketing. There was growing interest on the development of market share and growth strategy which later came to be known as marketing portfolio. The BCG matrix, Hofner-Schendel, Experience Curve and Porters Competitive models and GE/S were meant to achieve the marketing needs especially when introducing new products in the market. They were meant to stimulate strategic thinking especially among the senior marketing executives in the turbulent business environment. However, there has been dysfunction of these models in the way they are taught and the way they are applied in the market. This study will look into the applicability of portfolio models in strategic decision making in marketing. The study will evaluate the view from a number of literature to understand whether the model can really be applied to the decision making process or not. This paper therefore evaluates the available literature which has given an insight into this model to understand how it can be applied in strategic marketing decision. There are other methods that were introduced to give a product a distinctive market share especially when it’s introduced. There are four commonly used methods to approach this matter, the Boston consulting group (BCG), the General electric/shell (GE/S), Hofner-Schendel, Experience Curve and Porters Competitive models. Therefore to give the clear meaning of the portfolio model, there is a need to understand how the portfolio models work. The first step to be taken when using the above models is to understand the different business/ marketing strategies of the company. Portfolio models in marketing decisions Portfolio models management generally defines the way business comes up with strategic decision to venture into the market. In this definition, the strategic marketing decision is a method by which marketing ideas are made and implemented in order for a product to have stronger grounds in the market. At any one time, company will be coming up with new product which will need to be introduced to the market in the most successful way. Portfolio models therefore provide the business with important tools for analyzing of the strategic decision to determine their effectiveness in the market (Abell and Hammond, 1979, p. 42). Purpose of portfolio models in strategic decision making in marketing There are mainly four main purpose of using the portfolio models in the strategic marketing decisions which are pursued in portfolio management and must be achieved through any model that is used. These goals include the maximization of portfolio, seeking of the right balance of the available projects, aligning of the portfolio strategically, and aligning the projects to the available resource (Ansoff, 1984, p. 12). Smith and Swinyard (1999, p. 2) also show that portfolio marketing models are important for an organization to assess the overall success of a new product in the market before a lot of money is used in the development of the product. They both call for the use of multiple marketing models in order to achieve the overall success of introducing new products in the market. This will reduce the failure rate of the products and extend their life cycle in the market. (Thomas, 2002, p. 61) The models can also be used as important tools to forecast the level of competition and therefore draw upon effective way of beating this competition. They help to forecast the performance of a product in the market so as to draw up strategies to effectively introduce it in the market. Edgett, Cooper, and Kleinschmidt (2002, p. 2) showed that in order to achieve full development of a new product in the market, there has to be effective portfolio management. There are different types of portfolio models that include the BCG, GE/S, Hofner-Schendel, Experience Curve and Porters Competitive models. In his review of the portfolio models, Day (1977, p. 32) showed that the use of bubble diagrams had been gaining increasing use in business. Day shows that these models resemble the portfolio models with stars, cash cows, dogs, and others. He showed that these models could be used successfully to forecast the market in the future. Day therefore asserted the role of matrix like Boston matrix in marketing. The Boston matrix could be used to show four quadrants as has been shown by Day and corresponding strategies which could be used in each quadrant. However Day criticizes the matrix on the sense that it is too narrow on its scope. He asserts that the BCG matrix has a narrow focus on the market share of the product. On the other hand Morrison and Wensley (1991, p. 106) provided an insight into the portfolio planning models as used in making business decision. They asserted that the use of BCG matrix in portfolio management is inhibited by difficulties in measurement of the rate of market growth and the relative market share of the product. This is due to a number of reasons. They gave the most prominent reason being the fact that market boundaries are often very difficult to fix which meant the different matrix methods will give different recommendations for a given situation. Therefore they argue that the common scope of BCG matrix in a way ignores some of the most relevant strategic issues in business. Though these other models are not as famous as BCG, Day still argues that use of them could also lead to success in the market. Day advocated and recommended the use of Porters competitiveness that he viewed to have higher possibilities of success than other models if its well implemented. It is commonly used in an already operating business with other products in the market. The experience curve can only be help to the company that has been in the market for sometime with a different product. The experience that the company has gained in the given period will determine the strength of the company in the market. This has been used by several companies like coca-cola in the introduction their mineral water. It would be hard for a company that has not been doing well in the market to succeed with the new product. They showed that Boston matrix was a technique for one season and not for all the season. This is because its popularity and use increased in the 1960s and 1970s and then plummeted due to the challenges faced in the market. They showed that the single chart could be successfully used to determine the growth potential and the competitive strength of a product in the market but this has rapidly changed with time. Armstrong and Brodie (1994, p. 38) evaluation on the applicability of the Boston matrix concluded that the use of the matrix to guide investors often would result to wrong decision through the use of BCG. General Electric and Shell, Porters competitive models are designed for long term use in the market, once the product has been introduced in the market, the models techniques still continues to support the product through the entire life in the market. Whichever model is used, it has to be used for entire life of the company because no other model will fit without altering the companies business especially when the company is introducing new product in the market. Although they based their study on a small number of graduates in a class, they gave a further warning against the use of the matrix in a simple mind. Armstrong and Brodie (1994, p. 3) carried out a study on the effect of the portfolio planning methods on the overall decision making process. Their study pointed out the weakness in the use of BCG matrix in making strategic decision in an organization. Their study revealed that the use of BCG matrix in making investment decisions was highly likely to lead to unprofitable investment while Robert and Merton (1989, p. 210) advocates that the implementation of other models instead of matrix were intended for lifetime decision making. If not well implemented, there is a probability of causing life time losses and would be hard to recover unless the product is withdrawn from the market. Each model has some weaknesses bas they are exposed out in the way models assume a casual relationship between the market share and the profitability of a product in the market. Morison and Wesley (1991, p. 26) also pointed out lack of consistency in the use of the portfolio models in determining market growth and profits. These studies give varied views on the use of Boston matrix, GE/S, Hofner-Schendel, Experience Curve and Porters Competitive models in making marketing decision. They all seem to point out on the weaknesses of these models in light of their theory and application. There are other ways a business can prosper other than using portfolio models. The strategies used in introducing the product in the market is all that matters, portfolios are just to give the business a rough idea on how to approach the marketing matter but not to give a conclusive tread which the business should follow. Conclusion Portfolio models are applied in portfolio management. They are applied in management to make strategic marketing decision. Though they had gained increasing use in different times, they have some weaknesses that are fatal to the welfare of the business in future. On the other hand they may give a rough idea on how to approach the market issues and on how to introduce the new product in the market. In all portfolios, not is able to predict the growth and the profit margins or losses on the other hand for the product, thus making them less important tool for the marketing. However the use of models should be discarded and there be implemented new strategies that would be able to address the issues of the business on long term and in both growth and revenues that are likely to be gained by the introduced product. Recommendations: The use of portfolio models is not recommended and if they have to be used, they must be implemented with great caution. None of all models has proofed an effective strategic decision making in regard to the marketing issues. It should however be discarded or it should be used with caution. This paper does not recommend the use of portfolio models and an alternative way should be sought to replace this.

Strategy of Channelization in River Systems

Strategy of Channelization in River Systems The purpose of this essay is to analyze the strategy of channelization in river systems in order to reduce flooding, and other purposes such as navigation. Also the importance of channel forms and the value of the systems approach are evaluated within this essay when considering the pros and cons of restoration activities and whether these schemes are beneficial to the environment. Overall this essay will look at the environmental degradation caused by channelization and determine whether channelization is the most beneficial strategy in reducing flooding or are there alternatives that lead to less environmental degradation. Channel forms: Channel forms help humans comprehend the behaviour of rivers. This is vital as one can foresee how rivers may be affected by various changes and restoration schemes. Thus, the ability to protect and restore river health is enhanced. Channel forms are regulated by convoluted interactions between profuse environmental variables. This is why the systems approach is a useful method when analysing channel systems, as it does not just look at one variable but all of the linked variables involved. Even with this system shaping channel forms is highly dependent on geology; directly and indirectly over a prolonged period. Human interactions have also had an impact on the change of channel form for instance channelization (Water and river commissions, 2002). Channelization and its implementation: Human interaction with river systems is both the reason why channelization was implemented for example as a result of flooding and the cause of environmental degradation of the river systems. Humans interact with river systems in many ways and have impacted flooding of river channels due to increased population pressure, which has put a growing demand on water supply systems leading to environmental degradation. Deforestation around river channels have also increased flooding as deforestation impacts the interaction between precipitation and the drainage basin response. Due to increased awareness of river behaviour and dynamics new strategies were implemented and overtime humans modernised engineering structures and built broad structures to control and regulate river flows, such as channelization. Channelization according to Brookes is a type of â€Å"river engineering whereby the natural river channels are modified to control flooding, drain wetlands, and improve river channels for navigation, control stream-bank erosion and to improve river alignment† (Brookes, 1988). River channelization has seven types of alterations (Gregory, 2006). These are â€Å"(1) re-sectioning and realignment, (2) Dredging, (3) Snagging and clearing, (4) Levees or artificial embankments, (5) Bank protection, (6) Bed protection and (7) River training† (Charlton, 2008). An example where these alterations have been implemented is during the channelization of the River Raba in Carpathians, Poland (Wyzga, 1993). However, these engineering structures tend to have a large impact on river and the natural ecology and hydrology of the channel system. For years humans have interacted with channels and altered the natural geology of the systems and thus have lead to severe impacts on the â€Å"physical, chemical and ecological condition of the channel systems† (Brookes, 1988). The impacts of channelization usually involve the alteration of river hydraulics and the decrease of instream habitat. Other impacts discovered as a result of these alterations include increased water temp, erosion, elimination of bankside habitat. These impacts can cause severe environmental degradation (Gregory, 2006). Environmental degradation: The deterioration of systems within the environment by either natural or human influence is considered environmental degradation and as channelization alters the natural river system it leads to extreme environmental degradation. Impacts on the environment associated with human interference are usually quite complex and are mostly long term effects. Nevertheless, few studies have been conducted on the long term effects of channelization (Brooker, 1985). Swales (1982a) however inspected several environmental effects on channel engineering systems, in particular the impact on stream habitat and discovered that channelization has a major impact on instream and bankside habitat (Brooker, 1985), as well as the hydrology, aspects of flow and suspended sediment within river systems (Wilcock, 1991). Effects of channelization can also occur downstream in a channel system which broadens the extent of ecological disturbance (Brooker, 1985). The increase of flow velocity and its carrying capacity as a result of shortening and straightening the channels has an immediate ecological effect on instream habitat as many ecosystems need particular conditions in terms water velocity (Gore, 1978). This destruction within the channel systems leads to erosion of bankside vegetation which increases sediment loads in the channel (Keller, 1976; Karr and Schlosser, 1978). Sediment loads in channel systems are usually low (Lewin, 1981), however, in channelized rivers se the loads are increased as bed/channel wall sediments are scraped up. This release of sediment has major effects on the ecology of the river (Wilcock, 1991) as removal of bankside vegetation leads to temp changes and in results affects the ecosystem as well as reducing energy flow (Brooker, 1985). In some cases channel slopes have also seen as increase whilst channel roughness is seen to reduce. An example of environmental degradation was shown in Gregory (2006) which involved the Channelization of the Blackwater River in Johnson County, Missouri. This channel was shortened in 1910 in order to reduce flooding by deepening and widening the channel by â€Å"up to four times its original size† (Emerson, 1971). This subsequent lowering and increase of channel width lead to increased erosion in the river system, also bridge repairs have had to be carried out and there has been a severe loss of farmland. â€Å"Downstream reduction in channel capacity has caused suspended sediment in turn increased flooding rather than reducing it due to termination of dredging† (Emerson, 1971). Alternatives: Channelization was initially implemented to straighten and shorten river channels to reduce flooding. It was also implemented to decrease flow velocity and prevent flooding, however, this lead to environmental degradation which resulted in the depletion of instream habitats and depleted drainage function. As channelization has had problems leading to environmental degradation, alternative channel schemes have been developed to enhance water quality functions whilst preserving drainage function and lessening environmental degradation (Evans, Bass, Burchell, Hinson, Johnson and Doxey, 2007). There are many alternatives to channelization that environmentalists could install; one such method is stream renovation which has been implemented on â€Å"streams in Charlotte, North Carolina† (Nunnally, 1978). Unlike channelization stream restoration aims to decrease the risk of flooding and drainage problems â€Å"by employing channel design guidelines that do not destroy the hydraulic and morphologic equilibria that natural streams possess† (Nunnally, 1978). Minimal straightening which promotes bank stability by leaving trees is employed in this scheme. Also the reduction of channel reshaping and the use of bank stabilization techniques are used here to reduce flooding and control erosion as well as sedimentation problems (Nunnally, 1879). Other alternatives involve the formation of in-stream wetlands and â€Å"lowering of the floodplain to reconnect the channel with the floodplain, redesign of channels using natural channel design principles, and establishment of conservation easements† (Evans, Bass, Burchell, Hinson, Johnson and Doxey, 2007). Restoration: Recognising channel forms and understanding how they behave and change is crucial for managing and protecting channel systems, especially for river restoration activities. Due to severe environmental degradation restoration schemes have been implemented. Though, it is not known whether these schemes are beneficial. Restoration activities generally improve bank stabilization (Florsheim, Mount, and Chin, 2008) and have positively increased depth and flow variety and velocity as well as increasing habitat diversity in channel systems (Pretty, Harrison, Shepherd, Smith, Hildrew and Hey, 2003). Other benefits include the protection of infrastructure around river channels, and in relation to instream habitat it guarantees overall ecological system. Restoration schemes allow the natural process in the channel systems to redevelop and surrounding landscapes to restore. Restoration schemes are constructive in counteracting the environmental degradation caused by channelization; yet there are a few cons. For instance natural processes may not necessarily be enhanced. Also a clear understanding of channel process is important in implementing these schemes, as they may sacrifice natural conditions in order to protect infrastructure. Restoration schemes are extremely expensive and very complicated therefore it is generally impossible to remove all human influences meaning restoration may not lead to higher biological diversity. Channelization is commonly used to prevent flooding of channel systems; however, it has been found that the adverse impacts created by channelization projects far outweigh the benefits they intend to create. It is for this reason that alternative strategies are being developed so that in the long run creates less environmental degradation. The use of the systems approach is important as the use of all variables regulated by channel forms is necessary in making the new strategies environmentally acceptable. Also increased knowledge of channel systems and its dynamics have helped better restoration schemes and thus leading to the recuperation of many already channelized systems.

Automating the process of jib crane design

Automating the process of jib crane design Automating the Process of Jib Crane Design Chapter 1 Introduction 1.1 Introduction In a jib crane horizontal jib is fixed to a piller or to a wall and supports a movable lift. Jib crane mostly used in industries and for military purpose. The jib can also swing by the arc which corresponds to lateral movement (additional). These types of crane are used in warehouse stores to lift the goods to all floors. In the materials handling industry workers are often required to do large payloads. In situations where large payload movements would require extra forces to be applied by the operator, the material handling devices are provided now with automatic or motorized power assists. These are basically designed such that they can reduce operator tiredness and damage. Such cranes are power assisted jib cranes with advanced design. A jib crane consists of a pendulum like end line attached to a rota-table jib. Within this general cranes category there exist some devices with multiple degrees of freedom which includes variable load line length and jib length which is also variable. Point-point payload maneuvers with jib cranes are performed so as not to incite the spherical pendulum modes of the cable attached and payload assembly. In a typical way these pendulum modes yet time-varying, but shows low frequencies. That results in slow performance; hence high construction and transportation costs can occur. The figure below shows the different parts of jib crane. [Franklin, 1994] Jib Cranes are industrial machines which mostly uses for materials movements in construction of buildings, production halls, assembly lines, storage areas, and power plants. The design features of jib crane vary widely according to their major operational and manufacturing specifications such as: crane structure according to motion, weight and type of the load, crane location, geometric features, and environmental conditions. However, a review of the available literature tells that technical design of jib cranes are highly saturated and standardized in many industrial companies and organizations independent of the jib crane type. [Marchese, 1974] 1.2 Problems/Issues Today most companies currently uses manual calculations to provide product design specification for their jib cranes for their customers requirements. This job involves very hard work and the manual calculation. The reduced man work will efficient the companys process for design and manufacturing of the product. So it would be beneficial to automate this process which requires a software package in which all calculation can be done automatic. 1.2.1 Current Problems The problems in jib crane design incorporate advance design for their different customers and their different purpose and the companies dont have a computer program which calculates the design specifications for manufacturing for their customers. [Erden, 1996] 1.2.2 Literature review Current material handling systems exhibit anisotropic behavior. Their two planar degrees of freedom have requirement of different force inputs from the operator. For jib crane in generation of isotropic behavior there can be two directions, the first direction generates isotropy by floating the boom above the load. The second direction adds a power trolley and is capable of assisting by providing power to actually accelerate the given load. We can provide a cable angle sensor and ultrasonic distance sensor for the intelligence necessary to achieve isotropy. [A, Lorenz, 1999] Consideration of the available technology that is mainly based on the accumulated previous experience is important for better performance, higher safety and more reliable designs. It is well known that generic features of jib crane components are similar for various different types of cranes. Since the jib crane design procedures are highly standardized with these components, main effort and time spent in jib crane design projects are mostly for interpretation and implementation of the available design. In the figure below a rotatory jib crane is shown with degrees of freedom. The crane considered here consists of a rotatable jib with a load line attached to the end. A mass, representing a payload, is attached to the end of the load-line. The figure (1) is shown for analysis. The three co-ordinate system (three vectors shown) attached to the jib and rotates about the hub with an angular rate (gamma). The rotation angles are defined as rotation of the load-line about the two axes. The attachment point of the load-line to the jib is at a distance x from the centre of rotation of hub. The load-line has length L and the payload mass m. Alternative Concepts: Several concepts were evaluated: Single tension rod A single-rod design is assumed during the initial calculations to determine reaction forces on the building column. Extra analysis explained that this design did not have enough power for its length and capacity. Truss A trussed beam is considered, as it would have provided a very light, strong crane. This design was shortly discarded because it would have proven very difficult to study and build. Two tension rods A two-rod design can be selected because it could be made strong enough to support the design load up to the length of 30 feet, yet be simple enough to analyze with a combination of manual calculations and computer-based analysis. 1.2.3 Objectives To understand design and analysis of jib crane To design jib crane in AutoCAD / Solid work To develop calculation of jib crane data using Microsoft excel Chapter 2 Methodology 2.1 Flow chart: Start Design and analysis for the jib crane (Existing Design) and a modified design AutoCAD Design Create Microsoft excel software End In the initial stage the project overview and scope of project is analyzed. Further on the literature based on the current design is reviewed. Next stage is examining the design advancement of the jib crane using sensors and control to automate the crane process and in lowering the operator stress and power. After that the software developed will be used in design and selection of major jib crane parts for the manufacturing. The design stated by software would be seen as in AutoCAD or solid work. In the final stage the further advancement and conclusion will be made. The stages of the project are shown below. 2.2 Description: The project will consist of manual calculations of design specifications for the complex structures like Jib crane along with automated process. The use of Microsoft software along with some other package will be usedso that it would be more users friendly. First thecalculationwill be donelike moment of inertia, torque and transmission ratios etc.for the advanced mechanicaldesign of the Jib crane[Juvinall,1991] then the number of variables will be included in software to give the product design specification for jib crane directly which will help in reducing the manwork. The simple advantage to get the all data which are required in jib crane design will come directly and this process will help in reducing time taken to produce a required jib crane. The work will be done with existing data and current methods of calculation. At the end of project, a manufacturer should not calculate the various design data for the custom design of the jib crane for different purpose. The jib crane software itself will pick the most essential and important data and according to that will choose the simplified method to give design specification directly. Reader will be able to understand the various methods involved in jib crane design and advancement of design and the analysis of jib crane to make it effective. The practices followed and measures developed to make high-rise construction a safer job will be listed in report. Some of the main benefits of the automated design include the following: Greater consistency of design; this makes manufacturing and field service easier. Ability to explore more alternatives; because design can be created in a shorter time, it allows designers to study more alternatives. 2.3 Gantt Chart Gantt Chart: Project on â€Å"Automating design of jib crane† TASKS Oct Nov Dec Jan Feb Selection of the Topic Submission of the Project Proposal Literature survey on the Topic Submission of the Interim Report Software development Conclusion and Recommendations Final Report Submission Chapter-3 Design and Calculation of Jib Crane 3.1 Design Concepts for Jib Crane Jib cranes, a free standing or portable jib crane is an economical solution for moving materials within an individual workstation, for transferring materials from work area to work area, or for use as an auxiliary lifting device under an overhead crane. Jib cranes are designed and manufactured in four styles: Free standing or portable jib cranes Wall bracket tie rod supported jib cranes Wall cantilever jib cranes Mast style jib cranes (top and bottom supported) Articulating jib cranes are also manufactured for positioning loads in those hard to reach places where most Standard jib cranes cannot reach. An articulating jib crane can move loads around corners and columns, reach into machinery, and service an area from the closest pivot point to the end of the boom allowing 360 º of operation. Another jib crane is the workstation jib crane. From self-supporting to wall mounted, workstation jib cranes provides economic, supplemental lifting coverage with 200 º or 360 º of rotation. Features Standard jib cranes range in capacity up to 5 tons and spans to 20 feet. Jib cranes feature on unique trussed boom design, which offers longer spans for custom jib crane designs. Free standing and mast type jib cranes offer 360  º rotations. Wall mounted offers 200 º of rotation. Design Factor The standard capacity rating of a jib crane represents the net rated load of the hook at the hook of a hoist of the same rated capacity as the crane. The design factor for the stresses in the crane is based on the capacity plus 25% of the rated load for impact and 15% of the rated load for the weight of the hoist and trolley. This was used all along with the average yield stress of the material to find out the type of the design. [Juvinall, 1991] This design provides a margin to allow for variations in material properties, operating conditions, and design assumptions. No crane should be supposed to ever, in any circumstance, be weighted beyond its rated capability. Service Factor The maximum weight of the application should match, NOT exceed, and design weight. The capacity rating is dependent and based on a design load. The jib crane design criterion allows the least amount of deflection so as not to hamper the performance of the jib crane. 3.2 Design of a Jib Crane The unit system of choice is normally SI. For this design, though, the BG (British Gravitational) system is chosen because the dimensions of most acquired components are in inches. We are doing analysis and design of a 30-foot, 1 ton jib crane. Requirements The crane must meet the following criteria: Should have a capacity of one ton (2000 lb). Should have a 30 feet length. Should be able to mount on the existing building structure. The design load is 2700 lb, defined as follows: Pd = 2000 lb + 25% overload + 200 lb trolley weight The length of the crane is taken as that of the main beam. The entire crane will arrive at approximately 372 inches from its pivot point. The alternative concepts are already evaluated earlier. We are taking the crane with two tension rods. 3.2.1 Reaction Force Calculations Before detailed design could begin, it had to be determined whether the building structure could support the new crane. This can be accomplished by drawing a free body diagram of the overall crane structure, and calculating the forces that would act on it. The design load should be positioned in the worst-case position hence at the end of the main beam. Since the weight of the crane makes a noteworthy horizontal reaction force, its main structural components were specified for this practice. A single 200-lb tension rod, attached at 20 feet from the root of the main beam The weight of the vertical member (eight feet at 25 pounds per foot) was used in calculating the vertical reaction force, but was not deemed significant in calculating the horizontal reaction forces. Minor components e.g. mounting brackets and pin- fasteners, are not going to consider. The calculations solved on paper, give the following results for The 10 Inch diameter S10at25.4 the beam: Horizontal reaction force: 12,556 lb Vertical reaction force: 3854 lb 3.2.2 Design of Main Beam The main beam is the most structurally significant part of the crane, and thus was the first to be designed. The maximum stress of a crane has to be less than one fifth of the ultimate strength of the steel. The maximum deflection should be less than 600th part of the length of the crane. Manual calculations proved that the 8-inch beam would buckle under the compression made by applying the design load at the end of the beam. Buckling load A Beam, 360 inches long, meets both stress and deflection guidelines when used with two tension rods. The maximum stress and deflection, when the load is on the end of the crane, are as follows 3.2.3 Primary Structure With the main beam specified, the rest of the crane was designed around it. A model was constructed consisting of the main beam, the vertical member, and the tension rods, which were arbitrarily attached at 15 and 25 feet from the root of the main beam. Manual calculations performed later confirmed that these were appropriate attachment points. For the sake of simplicity, the vertical member can be specified as the same cross section as the main beam and the vertical member is 96 inches long. Rod tension Assume main beam pinned at one end 3.2.4 Minor Components Connecting the Tension Rods to the Main Beam The tension rods are connected to the main beam using a clevis, which is pinned to a mounting plate welded to the main beam. This clevis is having a tensile load rating of 45,600 lb which allows a considerable safety factor. The clevis pin is protected with a 1/8†inch cotter pin. Double-shear calculations show it to be more than strong enough. Clevis Pin The clevis mount was designed over-large, to fill up the clearances provided by the clevis. The calculations show that the clevis mount, like the clevis itself, provides a significant margin of safety. Clevis Mount Su = 58000 psi Sus = 33640 psi F = 21658 lb th = 2 ½ in ro = 21/8 in ri = 7/8 in d = 1 ¾ in The tension rod is connected to the clevis through a turnbuckle and since the clevis has a rod diameter of 1 ½ inches, the stud must be turned down from 2 ¼ inches to 1 ½ inches. The lower end of the tension rod should be threaded for inclusion into the turnbuckle. Specification of Bearings Using the overall horizontal reaction force as the radial load, the bearings can be specified. The bolt holes in the flange of this bearing are placed in the identical position. Design of Welds The weld connecting the tension rod to the top of the vertical member requires individual explanation. The tension rod on the crane is bent, and then welded to the top of the vertical member of that crane After placing one rod on top of the vertical member, welds 1 and 2 should consist of a groove weld, then a fillet weld. Weld 3 should use the same pattern subsequent to the second rod is being placed. At last, weld 4 is a groove weld. All welds should fill up obtainable clearances. 3.3 Design Modification: For each handling device, the two horizontal DOF differ in feel. For the jib and gantry cranes, motion along the trolleys direction of travel requires relatively little force. Similarly, on the bridge crane, motion along the bridge is relatively easy. But for the jib crane, moving perpendicular to the booms length is complicated by the booms rotational inertia and the boom pivots friction. For the gantry crane, this perpendicular motion is very difficult due to the large inertia of the crane, and as stated earlier, often requires power assist. Finally, for the bridge crane, it is the large inertia of the bridge and resulting increased rolling resistance in its trolleys that make the perpendicular motion more difficult. Low speed power assist has been added to each of these difficult motions: rotation of the boom on a jib crane, translation of a gantry crane, and translation of the bridge along the fixed rails of a bridge crane. The control of this power has been limited to simple push button on/off switches and control algorithms which provide a slow start and stop to minimize load swing. The anisotropy exhibited in the different motions remains. This lack of isotropy makes it difficult for workers to move an object from point to point. The worker must constantly vary the applied force as the desired direction of motion changes. To think of this phenomenon in different terms, consider a round stick half immersed in a pool of water. It is very easy to move this stick through a curved trajectory. The forces resisting the motion are independent of the motions direction. Now consider a paddle (which cannot be rotated) immersed in the pool. It is considerably more difficult to move this paddle through the same curved trajectory. The human must continually adjust to the changing resistance forces. Increasing the viscosity of the fluid will exacerbate the problem. This is analogous to increasing the size and/or load of a material handling system.[Franklin, 1994] Hence thus, ideally, overhead material handing devices would exhibit isotropy. That is, the feel of the device would be independent of the direction in which it was pushed. So the next objective is to advance the design of jib crane which is intelligent power assist jib and making the design calculation by Microsoft excel itself. For this design the drawing has been done for some parts and shown below. The rest of the analysis will be done in the final report. In the modified design we put some control sensor for the motion of the jib crane. References A, Lorenz., August 1999, Force Sensors for Human-Robot Interaction Erden Z., et al, 1996, â€Å"A Computer Based Design Support System for Automate Access to the F. E.M. Rules in a Crane Design Procedure†, Proceedings of the 7th International Machine Design and Production Conference, pp. 575-583, Ankara, Turkey G. Franklin, et al, 1994,Feedback Control of Dynamic Systems†, Third edition, Addison Wiley R. Juvinall and K. Marshek , 1991, Fundamentals of Machine Component Design Marchese P. J. and Rice R. F., 1974, â€Å"Trends in Equipment Design and Controls for Heavy Duty Industrial Overhead Traveling Cranes†, Iron and Steel Engineer, v. 51, n. 9, p.66 Baker J., 1971, â€Å"Cranes in Need of Change†, Engineering, v. 211,n. 3, p. 298

Stress Types Essay -- Papers Exploratory Stressing Problems Essays

Stress Types There are three types of stress that will be explained. At various times in our lives, one or more of these stresses may overcome us. The first of these is ?Type A? stress, which is both foreseeable and avoidable. For example, going on a roller coaster is both foreseeable and avoidable, thus, it is considered a ?Type A? stress. A ?Type B? stress is defined as something that is neither foreseeable nor avoidable. A good example of this is being hit by a baseball while watching the game. The last type of these stresses is called ?Type C? stress, and is defined as stress that is foreseeable, but not avoidable. A good example of this would be a teenager staying out too late and knowing that when she comes home, she will get into trouble with her parents. At certain times in our life, such as marriage, we may be confronted with ?Type A? stress (foreseeable and avoidable). We know, of course, that when we get married, we will have to endure this added stress. It is foreseeable because we know whether or not we will ask someone to marry us. It is avoidable because you ...

The Louvre :: Essays Papers

The Louvre T h e A r t M u s e u m s of P a r i s Paris is renowned worldwide for its art museums. There are so many, each with its own unique pieces of art, this report will only cover two of Paris’ most famous museums. Which are of course The Louvre and Museum d’Orsay. The Louvre History The Louvre was originally built in 1190 AD as a fortress for protection to the city of Paris during the Crusades. It was a fortress for nearly 500 years until it became an elegant palace. By the 1400’s France’s Royalty gathered at The Louvre to enjoy banquets and tournaments. Elaborate gardens were added along with an aviary and many wild, exotic animals. In 1415 France was captured by the British and The Louvre was ravaged by vandals. It fell into disrepair and was left unoccupied for nearly 150 years. This is when Francis the first tore down the original structure and erected an exquisite and prosperous palace. Every king since then on added an addition to The Louvre. It also served as their home until the French Revolution of 1789. The Louvre officially became a museum in 1793. The government opened it to the public which no longer meant art was only available to the upper-class. All through the previous centuries the government had collected priceless pieces of art and now displayed them in The Louvre. The collection was growing so big that more buildings had to be built to display the great and precious collection that was accumulated over so many years. This period was known as â€Å"The Restoration† as Napoleon established remodeling of the interior and exterior of the Louvre and eliminated all the shops that filled the Louvre from the 18th century. The Louvre Today Today The Louvre is one the World’s most famous Art Museums. It houses many famous masterpieces such as: The Mona Lisa Winged Victory of Samothrace Venus De Milo The Seated Scribe

Reflective Essay Founded Online, Not Mine Essay

The purpose of writing a reflective essay is to present what you felt and what you reflect after an experience. Readers will discover how you associate with the subject on which you are writing. Your reflective essay can provide your perspective and the lesson you learned from a given experience. A reflective essay must provide a personal perspective, inform of the purpose for creating, and indulge in personal thoughts as well as feelings. A reflective essay must present a purpose or a lesson to be learned from the story. You personalise the creation of a reflective essay by mentioning your role in the event or occurrence. A reflective essay will always provide for varying perceptions by studying the different point of views and aspects (mentioning if a certain decision had gone in another direction) and how you evaluate the experience as a whole. You must feel that the experience or occurrence is worthy of developing a reflective essay on. You must remember each detail and every facet of the story for the exploration of each description. You must mention the significance and the feelings that you have regarding the experience on which you write your reflective essay.

Araling Panlipunan Essay

The Human Poverty Index (HPI) was an indication of the standard of living in a country, developed by the United Nations (UN) to complement the Human Development Index (HDI) and was first reported as part of the Human Development Report in 1997. It was considered to better reflect the extent of deprivation in developed countries compared to the HDI.[1] In 2010 it was supplanted by the UN’s Multidimensional Poverty Index. The HPI concentrates on the deprivation in the three essential elements of human life already reflected in the HDI: longevity, knowledge and a decent standard of living. The HPI is derived separately for developing countries (HPI-1) and a group of select high-income OECD countries (HPI-2) to better reflect socio-economic differences and also the widely different measures of deprivation in the two groups The Gender Empowerment Measure (GEM) is the United Nations Development Programme’s attempt to measure the extent of gender inequality across the globe’s countries, based on estimates of women’s relative economic income, participations in high-paying positions with economic power, and access to professional and parliamentary positions. In 1995 in the Human Development Report commissioned by the United Nations Development Program set-out to create two new measurement indices for measuring development. Their aim was to add to the Human Development Index by way of including a gender dimension in the measure. They were created in order to rival the traditional income-focused measures of development such as the Gross Domestic Product (GDP) and the Gross National Product (GNP). Haq, the first director of the Human Development Report Office, established several principles for the newly emerging measure including provisions that it had to be simple, had to be represented as a single number, had to be easily calculated, had to yield numbers that were internationally comparable, had to use numbers available on a yearly basis and had to use numbers that were easily interpretable. The resulting measures that were created were the Gender-related Development Index (GDI) and the Gender Empowerment Measure (GEM). The GEM, the more specialized of the two, is focused on indicating the relative empowerment of women in a given country.