Vibration reduction of brush cutter considering human response characteristic

摘要

Balancing brush cutter was developed to be used safety and easy handling. In this study, we tried to improve the vibration through subjective evaluation tests and the vibration analyses. In the first subjective test, participants evaluated handle vibration feelings of some brush cutters and the frequency characteristic to the vibration feeling was clarified. Subsequently, the handle vibration from 100 to 200 Hz was found to be large and the handle pipe structure had high influence on the large vibration through measurements and analyses of the handle vibration at the operational condition. We then applied several countermeasures including modification of the handle pipe length to reduce the vibration. As a result, the handle vibration of the brush cutter was reduced much and the vibration feeling was improved.