Design for Optimization

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Last updated 9:53 PM on 10/1/26
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12 Terms

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Robustness

The condition of a product or process design that remains relatively stable with a minimum of variation, even through factors that influence operations or usage are constantly changing

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Taguchi’s robust parameter design (RPD)

Quality should be designed into the process and the product (want to create products and processes that are robust, performing consistently even when exposed to noise factors)

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Variables in RPD

Controllable and uncontrollable

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Controllable variables

once chosen, values and settings remain fixed

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Uncontrollable variables

Hard to control variables that are expected during normal use of a process or product

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Who controls controllable variables?

The people responsible for designing, optimizing, or operating the process (the user has control of these variables only if the product is designed for them to customize performance) (most cases the user does not have control)

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design failure mode and effects analysis (DFMEA)

  • Assessment tool to proactively address product risks early during the desgin process

    • Identify and anticipate mechanisms of failure before they ever happen, and implement prevention systems into the design


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Basic steps to DFMEA

  1. Determine how the component can fail

  2. Determine possible causes of the failure

  3. Determine the effect on the product or system within which it operates (what are the effects could result from each failure mode identified?)

  4. Assign severity ranking (effect of failure on the customer) (2-4 = annoyance, 5-6 = loss or reduction in secondary function, 7-8 loss or reduction in primary function, 9-10 very severe consequences where regulatory and safety factors cannot be overlooked)


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Fault tree analysis (FTA)

  • Top down approach to failure analysis, starting with a potential undesirable event called a top event, and then determining all the ways it can happen

  • a way to identify causes associated with failures (good complement to DFMEA)


<ul><li><p>Top down approach to failure analysis, starting with a potential undesirable event called a top event, and then determining all the ways it can happen </p></li><li><p>a way to identify causes associated with failures (good complement to DFMEA)</p></li></ul><p></p>
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FTA and gate

The output event occurs only if all the input events occur at the same time

<p>The output event occurs only if all the input events occur at the same time </p>
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FTA or gate

The output event occurs if any one of the input events occur

<p>The output event occurs if any one of the input events occur </p>
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Limitations of FTA

  • Difficult to conceive all possible scenarios leading to the top event

  • Construction of fault trees for large systems can be tedious

  • Subjective decisions regarding the level of detail and completeness