Grass trimmer is identified as a type of machine which contributes high vibration level and can cause hand-arm vibration. Hand-arm vibration syndrome (HAVS) can cause musculoskeletal disorder, neurology and complex vascular. The risk of developing HAVS is depending on the magnitude of vibration transmitted to the tool handle, the duration of vibration exposure and the user sensitivity to HAVS. In this study, a prototype handle is designed to reduce the vibration level. Three rubber mounts were used as isolator in the experiment. There are three isolators was selected to measure the different acceleration between the specimen. In addition, the transmissibility of engine was selected to compare between the original and three different isolators but on transmissibility of handle was compared between three rubber mounts. Every isolator has different value of stiffness and damping. When stiffness and damping are decrease in value; the vibration level was decreases. However, decrement of stiffness and damping, the value of transmissibility were decreases. In addition, the dynamic behavior as natural frequency and mode shapes of free analysis was determined between the original handle and the prototype handle. According to the analysis, the local and global vibration were found in the vibration mode of the grass trimmer.
