Sheet metal lift trolleys : effects of design differences on muscle activity and subjective perceptions of operators

Yap, Peei Yong (2018) Sheet metal lift trolleys : effects of design differences on muscle activity and subjective perceptions of operators. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Muscle fatigue are caused when human is performing the manual tasks repetitively and in awkward posture for prolonged period. The using of lift table cart jack required subject to bend down to hold the sheet metal may causing the muscle fatigue. Trolley lifter was designed to reduce the awkward posture of the subject during performing the loading and unloading tasks. An experiment was conducted in order to examine the effect of differences in the two sheet metal handling devices which is lift table cart and trolley lifter. The objective of this study is to compare the muscle activity and subjective perceptions of the subjects using the sheet metal handling devices to performing tasks. Surface electromyography has been used to measure and analysed the muscle activity in order to compare the effect differences between two sheet metal handling devices. The surface electromyography data were collected at biceps brachii, triceps brachii, lower back muscle and trapezius by using Noraxon EMG device. sEMG data predicted compression at 90th percentile by using the repeated measures analysis of variance (ANOVA) and the T-test. The subjective perceptions were made between two sheet metal handling devices based on the usefulness, usability and the desirability. This study showed that the muscle activity for the trolley lifter is lower than the lift table cart jack in term of loading and unloading task. Besides that, the subjects were more prefer to use the trolley lifter for transportation compare to the lift table cart jack.

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