Development Of Measurement System For Indirect Hand Grip Force And Wrist Angle For Bionic Hand

Md Amin Teng, Fazilla (2015) Development Of Measurement System For Indirect Hand Grip Force And Wrist Angle For Bionic Hand. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

In today’s world, the number of physical disability people is increasing year by year. To overcome the problem, bionic hand is introduced. However, most of the bionic hands designed are complex and time consuming. Thus, in this project, a bionic hand with a designed measurement system is proposed. The first objective is to design and develop a measuring system that consist of preamplifier with DRL concept, band pass filter, full wave precision rectifier, smoothing circuit and also inverting amplifier in order to extract linear enveloped EMG signal. The second objective is to establish the relationship of EMG signal with hand grip force and wrist angle. An experiment is done which the angle considered are 60°, 90°, and 120° with the hand grip force of 20N, 60N and 100N to obtain the relationship. The last objective is to see the performance of the bionic hand in terms of repeatability and accuracy by using the designed measuring circuit. In terms of repeatability, the bionic hand is led to follow the actual human hand in terms of gripping and relaxed position to see the ability of the bionic hand to repeat and follow the human hand. From the results obtained, the bionic hand manages to yield the movement repeat ably. Finally, in terms of accuracy, the angle of each fingers of the bionic hand is test respect to the expected angle of bionic hand. From the results, the bionic hand considered as accurate as most of the fingers have lower percentage of error than 50%

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