Improvement in Vibration Characteristics of Brush Cutter Based on Evaluation of Subjective Sensation

Abstract

In this study, a subjective evaluation was performed into the sensation of brush cutter vibration experienced by operators to improve its vibration characteristics. The results indicated the sensation was particularly strong for handle vibrations in the frequency range 50∼500Hz. Experimental measurements were then performed to determine the vibration characteristics of the brush cutter at different engine rotation speeds. The vibration amplitude was found to be large at high rotation speeds, particularly at frequencies 100∼200Hz, which are within the range where the sensation was strong. Several countermeasures were then applied to reduce the vibration, including changing the handle pipe length. As a result, the vibration sensation at high speeds was significantly improved without any increase in total weight.