VIBRATORY CHARACTERISTICS AND HAND-TRANSMITTED VIBRATION REDUCTION OFWALKING TRACTOR

The main excitations and characteristics of the hand-transmitted vibra tion of a walking tractor were investigated and a new type of vibratio n-isolating handle grip, which equipped with an anti-vibration device, was designed. In accordance with ISO5349-1986(E)(ISO, 1986), the vibr ation-isolating effect of the new anti-vibration device was evaluated The measured results showed that the vector sum of frequency weighted accelerations in three directions was decreased by 41.1%, and the late ncy period before neuro-vascular disorders of the hands was prolonged from 1.417 years to 3.209 years, if the daily exposure is 8 h and the risk of pathology appearance is 30%. The anti-vibration device is of s imple structure and good anti-vibration properties, and could be easil y installed on existing walking tractors.