Slide 1Slide 2RWL = 51(10/H)(1-.0075|V-30|) (.82+1.8/D)(1-.0032A)FMxCMFrequency MultiplierEx. #1 - Infrequent LiftingEx. #2 - Repetitive LiftingSlide 7Effect of Multipliers - 1Effect of Multipliers - 2Effect of Multipliers - 3Multi-Task LiftingEx. Multi-Task LiftingSlide 13DesignToolsIE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #15IE 5532IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #15IE 5533RWL = 51(10/H)(1-.0075|V-30|) (.82+1.8/D)(1-.0032A)FMxCMCoupling TypeV<30 V≥30Good 1.00 1.00Fair 0.95 1.00Poor 0.90 0.90IE 5534Frequency MultiplierIE 5535Ex. #1 - Infrequent Lifting RWLor = 51(10/H)(1-.0075|V-30|)(.82+1.8/D)(1-.0032A)FMxCMRWLdest = 51(10/H)(1-.0075|V-30|)(.82+1.8/D)(1-.0032A)FMxCMBox into CarIE 5536Ex. #2 - Repetitive Lifting Sam restocks cases of Coke (compact, with handles):1) 5/min for 8 hrs, each weighs 20 lbs.2) from cart to shelves (worst case, V=0, to V=40)3) twisting 45° each way, H=15 for shelfRWLor = 51(10/H)(1-.0075|V-30|)(.82+1.8/D)(1-.0032A)FMxCMRWLdest=51(10/H)(1-.0075|V-30|)(.82+1.8/D)(1-.0032A)FMxCMIE 5537Frequency MultiplierIE 5538Effect of Multipliers - 1IE 5539Effect of Multipliers - 2IE 55310Effect of Multipliers - 3Frequency MultiplierIE 55311Multi-Task Lifting•Multi-task lifting ↑ LI over single-task•↑ LI from worst case, as marginal effect•Calculate Composite LI (CLI) from:–Single task RWL (STRWL)–Frequency independent RWL (FIRWL), FM=1–Single task LI (STLI)–Frequency independent LI (FILI)–CLI = STLI1 + FILI2x(1/FM1,2 – 1/FM1)IE 55312Ex. Multi-Task LiftingCLI = STLI1 + FILI2x(1/FM1,2 – 1/FM1)CLI = 1.6 + 1.0x(1/.88–1/.94) + 0.67x(1/.7–1/.88) = 1.9IE 55313Frequency MultiplierIE
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