Abstract
Motorcycle riders are exposed to hand-transmitted vibration of the hand-arm system due to the vibration of the handle and extended exposure can result in numbness and trembling. One feasible solution to attenuate the handle vibration is by using a dynamic vibration absorber (DVA). In this work a DVA is designed and mounted on the motorcycle handle in order to reduce the vibration at the handle by transferring the vibration from the primary system handle to the secondary mass. Removal of elastomeric material at the DVA mounting locations, symmetry of secondary mass and the direction of DVA attachment influence the vibration absorption. A series of tests conducted show that the vibration on the handle is mainly induced by the engine and there is additional source of vibration from the road surface roughness. Installation of DVA at different locations on the handle resulted in various attenuation levels at different speed in the x and z directions. the attenuation level is between 59-68 % in the biodynamic x-directions for speed at 30-50kmh-1.
Highlights
Motorcycles are one of the major transportation vehicle used in the world because they are cheap with low fuel consumption and easy to handle [1]
Standard human vibration exposure limit set by the European Directive (European Directive/2002/44/EC) can be used to achieve the acceptable level to reduce the prevalence of hand arm vibration syndrome
This paper covers the development of dynamic vibration absorber for use on motorcycle handlebar which include on the road test of speed range at 30-50 kmh−1
Summary
Motorcycles are one of the major transportation vehicle used in the world because they are cheap with low fuel consumption and easy to handle [1]. Most studies in the past were mainly done by measuring handle vibration with the motorcycle stationary on the dynamometer [7] or at relatively low speed of up to 10 kmh−1 [2] or at a mean velocity of 40 kmh−1 [8]. This paper covers the development of dynamic vibration absorber for use on motorcycle handlebar which include on the road test of speed range at 30-50 kmh−1. A small light weight accelerometer (Dytran 3055B2T) was used to measure the vibration response in the x-axis while an impact hammer (Krisler 9724A5000) was used to excite the motorcycle handlebar.
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