STUDY OF HAND-ARM VIBRATION

Abstract

This study includes the solid modelling of the human hand and its modal analysis. The solid model created in 'Solid works' converted into 'PARASOLID' file and exported to 'Abaqus' for the modal analysis. 'Abaqus' has the ability to generate a tetrahedral mesh from a well conditioned surface mesh. The experiment has been done to compare the Vibration Energy Absorption (VEA) transmissibility for the horizontal and vertical direction of z-axis, handle vibration of the human hand-arm are characterized in the laboratory. The experiments involved six male subjects grasping an impact drill machine of 6.5 mm and 8 mm diameter drill size subjected to broad-band random vibration targeted on concrete block and wooden plank. Trans missibility is measured from 'handle to wrist' (I-ITW) and handle to elbow' (1-ITE). The result shows the resonant frequencies are consistent at different mode shapes of the human hand under two degree of freedom systems. It also shows that the VEA is maximum in horizontal direction and on concrete block while drilling. Also the Transmissibility is higher at 'handle-to-wrist' (HTW) and on concrete block as it is hard compared to wooden plank for drilling. Also the VEA and the Trans missibility shows linear relationship with drilling size to be drill.