关键词: 微耕机, 手传振动, 握力, 1/3倍频程, 振动传递率

Abstract: Operators of power tillers are exposed to highlevel handtransmitted vibration during working. However, the characteristics and transmission process of power tillers handtransmitted vibration are currently unclear. In this study, measurements of ten subjects were conducted to determine the characteristics of the power tillers handtransmitted vibration using accelerometers, thinfilm pressure sensors, revolution meters, and other equipment. The characteristics of vibration intensity and transmission process at key nodes of the manmachine system were comprehensively analyzed under three levels of engine speed and three levels of grip forces. The results demonstrate that the engine speed is the dominant factor in the vibration intensity of the operatorpower tiller interface. With the increase of grip force, the vibration transmission ability of the handarm system is enhanced. Meanwhile, the vibration coupling effect between the handlebar and the operators handarm system is more obvious. The handarm system has the effect of lowpass filtering during the transmission of the power tillers vibration, and its cutoff frequency is around 100 Hz. This research provides guidance and support for the prevention of vibration syndromes and the development of vibration isolators of power tillers.

Key words: power tiller, handtransmitted vibration, grip force, 1/3rd octave band, vibration transmissibility