MAE486_Fall11_L23_S

MAE486_Fall11_L23_S - MAE 486 Design of Mechanical Systems...

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MAE 486 Design of Mechanical Systems Lecture 22 Fall 2011 Today ` s’topics:’ Manufacturing consideration of design (Chapter 13); Robust design (Chapter 15);
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Process’Capability’ Process’capability’index’ C p ’ ’ ’ ’ ’ ’ ’ ’ ’’ ’ ’ ’ ’ ’Control’charts’ Review A’spindle’has’a’spec.’on’its’diameter’of’1.5+/-0.009’ inch.’If’ C p =1.’what’is’?.’ What’would’be’std’to’achieve’ C p =1.33?’ If’ C p =1.33’and’mean’is’centered’within’the’range,’how’ many’oversize’parts?’
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Process’Capability’ If’the’mean’is’not’centered’within’the’tolerance’range,’ process’capability’index’ C pk The’distance’of’the’process’mean’diFers’from’the’ midpoint’of’the’tolerance’region’is’give’by’ How’ ’ ’ does C pk and C p relate to each other? Taguchi’Methods The’input’parameters’aFecOng’the’quality’of’the’product/ process’ à Noise factors: What’are’they?’ Varia1onal noise :’ Inner noise :’ Design noise :’ External noise (outer’noise):.’
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Robust’Design’ What’is’it?’ Approach’ à ’O p±mum’values’of’design’factors’ à economical’design’&’low’variability.’ Parameter’design:’ Iden±fy’the’se²ngs’of’the’design’parameters’or’ process’variables’ à ’R educe’the’sensi±vity’of’the’ design’to’sources’of’varia±on.’ How’to’do’parameter’design?’ Step’1:’Iden±fy’Control’factors’ Design’parameters’that’primarily’aFect’the’S/N’ ra±o’but’not’the’mean.’ Step’2:’Adjust’the’mean’response’by’using’a’ suitable’design’parameter’(the’signal’factor)’ once’the’variance’has’been’reduced.’
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Parameter’Design’(cont±d)’ What’is’the’trade-of?’ Min’(#’oF’tests)’vs.’Loss’(Detailed’inFormaOon’oF’interacOons).’ Two’commonly’used’orthogonal’arrays.’ (a) L4’deals’with’three’control’Factors’at’ two’levels.’A’total’oF’4’runs’oF’D²E’is’ needed.’
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MAE486_Fall11_L23_S - MAE 486 Design of Mechanical Systems...

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