CEE_492_F06_design_p_1384B1 - The Engineering Design...

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The Engineering Design Process Engineers for a Sustainable World (CEE 492)
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In this lecture… Definition of the engineering design process Steps in a representative approach to the design process Problem formulation A case study: designing a new ATM machine
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Engineering Design Process Process of devising a system, component, or process to meet desired needs. It is a decision-making process…in which the basic sciences and math and engineering sciences are applied to convert resources optimally to meet a stated objective. —ABET
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1. Define the problem 2. Identify evaluation criteria and constraints 3. Research and gather data 4. Generate feasible alternatives 5. Evaluate the alternatives 6. Iterate 7. Implement the preferred alternative 8. Evaluate implementation and provide feedback Engineering Design Process
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WHY IS IT IMPORTANT? WHAT MAKES A GOOD PROBLEM DEFINITION? 1. Problem Formulation
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Poor problem definition can lead to a misdirected , or overly limited search for solutions Based on input from all stakeholders Focuses on source of the problem, not symptoms Not just what is wrong, but why is it wrong? Focuses on functions, not a specific solution WHY IS IT IMPORTANT? WHAT MAKES A GOOD PROBLEM DEFINITION? 1. Problem Formulation
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Problem Statement Examples Okay : Design a new lawn mower that will be the most popular product on the market. Better : Design an effective means of maintaining lawns. Okay : Develop a material that is able to withstand the high temps. of reentry. Better : Okay : Develop shutters that can protect window glass in future hurricane winds. Better : Okay : Design a device to wake up sleepy medical residents while they are on duty. Better : [Note: problem statements are phrased as commands.] Step 1
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Okay : Design a new lawn mower that will be the most popular product on the market. Better : Design an effective means of maintaining lawns. Okay : Develop a material that is able to withstand the high temps. of reentry. Better : Okay : Develop shutters that can protect window glass in future hurricane winds. Better : Okay : Design a device to wake up sleepy medical residents while they are on duty. Better : [Note: problem statements are phrased as commands.] Reduce medical resident mistakes caused by sleepiness. Problem Statement Examples Develop a way to protect astronauts during reentry. Reduce damage to homes in future hurricanes. Step 1 Step 1
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Write and rewrite the problem statement until it’s right! Initial problem statement Increase the number of commuters who use public transportation. Substitute explicit definitions of certain terms Increase the number of people traveling to work each day who use trains or buses . Replace persuasive & implied words with the reasoning behind
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CEE_492_F06_design_p_1384B1 - The Engineering Design...

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