1 Develop A Reasonable Set Of Engineering Specifications Problem Definition Using The Information Given To You In Cha 1 (55.36 KiB) Viewed 38 times
1 Develop A Reasonable Set Of Engineering Specifications Problem Definition Using The Information Given To You In Cha 2 (54.99 KiB) Viewed 38 times
1. Develop a reasonable set of engineering specifications (problem definition) using the information given to you in Chapter 1. Be specific as possible; make assumptions as necessary. Use some of the considerations from Figure 3 as you develop your engineering specifications. Design Considerations Sometimes the strength required of an element in a system is an important factor in the determination of the geometry and the dimensions of the element. In such a situation we say that strength is an important design consideration. When we use the expression design consideration, we are referring to some characteristic that influences the design of the element or, perhaps, the entire system. Usually quite a number of such charac- teristics must be considered and prioritized in a given design situation. Many of the important ones are as follows (not necessarily in order of importance): 1 Functionality 2 Strength/stress 3 Distortion/deflection/stiffness 4 Wear 5 Corrosion 6 Safety 7 Reliability s Manufacturability 9 Utility 10 Cost 11 Friction 12 Weight 13 Life 14 Noise 15 Styling 16 Shape 17 Size 18 Control 19 Thermal properties 20 Surface 21 Lubrication 22 Marketability 23 Maintenance 24 Volume 25 Liability 26 Remanufacturing/resource recovery Some of these characteristics have to do directly with the dimensions, the material, the processing, and the joining of the elements of the system. Several characteristics may be interrelated, which affects the configuration of the total system. Figure 3 Design Considerations
2. After defining problem with engineering specifications (item 1 above) create an initial, tentative flowchart (similar to Fig. 4, but much more detailed) for ONLY stages 2, 3, and 4 (Definition of Problem, Synthesis, Analysis and Optimization)of the design method (Fig. 4). 3. Specify the tasks that must be performed in each phase before moving to the next phase. 4. Discuss iteration and optimization as they pertain to refining the design. 5. Discuss all major machine elements comprising the loader. Identification of need Definition of problem Synthesis Analysis and optimization Evaluation Presentation Figure 4 The Design Method Iteration
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