Design and evaluation of test rig for measuring hip flexor strength in standing position

Abdul Talib, Azreen Shafira (2022) Design and evaluation of test rig for measuring hip flexor strength in standing position. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

The hip flexor muscles play a significant role in performing daily and work activities, especially in manufacturing and construction industries such as ascending/descending scaffolding and ladders. These work activities are potentially to cause problem to workers’ motion if the hip flexor is weakened. Consequently, the workers may experience pain in the lower back, thus work efficiency and productivity might be affected. To prevent these consequences, however, ergonomics practitioners and industrial engineers have limited technical data on the hip flexor strength. This is due to absent of a sturdy test rig for measuring the hip flexor strength. Therefore, the objectives of this study are to determine design requirements to develop a prototype of test rig for measuring hip flexor strength and evaluate the usability and functionality of test rig prototype. The result of this analysis revealed that the design requirements for the test rig were stable, compact size (not bulky), sturdy, light weight, and environmental-friendly. Several concepts are then developed through Pugh method, and one best concept was chosen based on the screening matrix. The best concept design has been translated into engineering drawing on CATIA software and analysed using ANSYS engineering simulation software to evaluate the deformation and maximum stress on the structure of the prototype. Then, usability study and functionality test were carried out to ensure the test rig prototype is able to collect data on hip flexor strength. This study found the maximum hip flexor strength of male and female participants was 347.8 N, and 211.8 N, respectively. According to the functionality prototype of test rig using System Usability Scale (SUS) score is 74.25 determined as an acceptable range usability. Based on the results obtained, this study concluded that the data of hip flexor strength was reliable when using this prototype of test rig. The test rig prototype developed by this study would be meaningful to ergonomics practitioners to collect data on hip flexor strength so that work process in industries can be designed ergonomically.

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