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Updated: Sep 17, 2025

Measurement of the Hand Transmitted Vibration of the Human Hand Arm System During Operation of a Hand Tractor
Published on: June 16, 2021
Motorboat engine hand-arm vibration attenuation using dual-dynamic vibration absorbers under different engine gear
Nabil Mohamad Usamah1, Mohamad Syazwan Md Isa1, Ahmad Zhafran Ahmad Mazlan1
1School of Mechanical Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Pulau Pinang, Malaysia.
Abstract:
Direct contact with a small motorboat engine handle exposes operators to high vibration levels, risking hand-arm vibration syndrome (HAVS). This study investigates handle vibration transmissibility and applies dual-dynamic vibration absorbers (DVAs) to reduce vibration within targeted frequencies. A laboratory-scale rig simulates engine operation under varying speeds and gear conditions. Without DVAs, high vibrations occur at 45-50 Hz (Speed 1) and 95-100 Hz (Speed 2). The handle's natural frequencies (70-78 and 92-96 Hz) shift closer to target ranges with DVAs applied. Vibration is reduced by 42.08% in neutral gear (Speed 1) and 53.56% in forward gear (Speed 2). Transmissibility within 0-100 Hz shows a significant drop (Ts < 1), indicating reduced vibration from engine to hand. Standard No. ISO 5349-1-based weighting confirms that DVAs substantially lower vibration risks, helping to prevent HAVS in motorboat operators.
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