Slide 1Slide 2Vibration (Ch. 12)Effects on Human - MechanicalSlide 5Effects on Human - PhysiologicalSlide 7HAVS - AttenuationWhole-Body Limits (Vertical)Slide 10Worker Selection (Ch. 13) Assigning the right worker to the right jobSensitivity and SpecificityTrainingIE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #20IE 5532IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #20IE 5533Vibration (Ch. 12)•Forced = external•Free = internal•Average = (∫|x|dt/T)½•RMS = (∫x2dt/T)½•dB = 20 log10 (a/a0)•Piezoelectric sensors•AccelerometersIE 5534Effects on Human - MechanicalIE 5535Effects on Human - MechanicalIE 5536Effects on Human - Physiological•Activates muscles–Skeletal (back)–Smooth (arterioles)•Problem in hands–HAVS - blanching–“White finger”–Raynaud’s diseaseIE 5537Cumulative EffectIE 5538HAVS - AttenuationIE 5539Whole-Body Limits (Vertical)IE 55310Hand-arm LimitsIE 55311Worker Selection (Ch. 13)Assigning the right worker to the right jobAccuracy = test’s ability to provide true answer, small deviations from targetPrecision = small variations about meanIE 55312Sensitivity and SpecificitySensitivity = Test’s ability to identify worker’s developing disease = a/(a+c)Specificity = Test’s ability to identify worker’s not developing disease = d/(b+d)IE 55313Training•X-rays•Anthropometry•Range of motion and pain•Muscle strength•General fitness•General awareness•Lifting techniques•Use of aidsPhysical ExaminationBack
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