Estimation of comfort parameters of an active vibrationisolation system of handle of percussive power tool

摘要

The first step for the assessment and choice of comfort parameters of an active vibration isolation system of hand – held percussive power tools is the construction of appropriaterndynamical model of the operator – tool – base system (OTB). The interaction between the hand and handle is composed of the passive, dynamical reaction of the hand caused by the vibration signal and a slowly varying feed force by which the operator controls the tool operation. In the paper a complexrnmodel of system OTB was proposed. Visual and tactile feedback signals coming to human nervous system were assumed as basic components of control of percussive tool by operator. It was shown that vibration comfort and work efficiency of the percussive tool are contradictory notions. Some feedbackrnsignals responsible for the control of the tool operation are attenuated by the vibration isolation system and finally when vibration comfort increases the control of the tool and the work efficiency decrease. In the paper a criterion of assessment of work comfort with percussive tool was assumed. Simulation of the proposed model of OTB was done applying Matlab – Simulink. The influence of parameter values of the proposed active vibration isolation system on the assumed comfort criterion was analyzed. The obtained results were graphically presented.