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chapter4 - EML 3004C CHAPTER 4 What is Design Namas Chandra...

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Namas Chandra Introduction to Mechanical engineering Chapter 4-1 EML 3004C CHAPTER 4 What is Design?
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Namas Chandra Introduction to Mechanical engineering Chapter 4-2 EML 3004C Objectives Sections 4.1 Concept of Design 4.2 Difference between design and analysis 4.3 Good design versus bad design 4.4 Design Cycle The meaning of the word “design” Difference between design, analysis and reproduction Difference between good and bad design Engineering Design Process Design Cycle A design competition example
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Namas Chandra Introduction to Mechanical engineering Chapter 4-3 EML 3004C 4.1 Concept of Design Design is the development of a product or device to meet a specific need Design may not necessarily be a physical product Development of Microsoft word software is considered a software design of a word processing program. In mechanical engineering world, by device we typically mean a product. It may range from an automobile, engine or even a spark plug.
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Namas Chandra Introduction to Mechanical engineering Chapter 4-4 EML 3004C 4.2 Difference Between Design and Analysis Analysis is different from design or reproduction Analysis is the application of engineering science and mathematics to a well-defined, well-posed process with a unique solution. Design is a solution to a problem with ill-posed constraints. There are many possible solutions all valid to the problem. Analysis …….. If a 6' man reaches the top of the building at 32° standing 40' away from base, what is the height of the building? Design …….. Given a building, device a method to measure the height of the building. .
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Namas Chandra Introduction to Mechanical engineering Chapter 4-5 EML 3004C Design example of a Catapult Rewind back to middle ages! We need to design a device to haul objects from a distance accurately on to a target. Suppose we need to determine the trajectory given all geometric variables, we can use basic dynamic equation: 2 2 2 2 0 0 2 2 / 0 cos sin x y x y o x y F ma a F m dv d x dt dt dv d y g dt dt dx v V dt dy v V dt V v v θ θ = = = = = = - = = = = = + Given specific x, angle and distance we have a unique velocity to get to the target- Analysis But there are many possible ways to choose combination of these variables- Design .
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Namas Chandra Introduction to Mechanical engineering Chapter 4-6 EML 3004C Analysis of the Catapult Trajectory
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Namas Chandra Introduction to Mechanical engineering Chapter 4-7 EML 3004C 4.3 Good vs. Bad Design In general a design that just barely meets the expectation is a bad design. If the design fails to meet the requirement it is no design. If a design exceeds expectation in terms of cost, performance, maintenance, rugged, eventual disposal and safety then it is a good design.
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Namas Chandra Introduction to Mechanical engineering Chapter 4-8 EML 3004C 4.3 Good vs. Bad Design Some characteristics of Good Design 1. Does the product meet technical requirements?
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