Author/Authors :
Fayzi، Masoud نويسنده Master science of Mechanical Engineering of Agricultural Machinery, University of Tehran, karaj, Iran , , Jafari، Ali نويسنده Associte professor of Mechanical Engineering of Agricultural Machinery, University of Tehran, karaj, Iran , , Ahmadi، Hojat نويسنده Associte professor of Mechanical Engineering of Agricultural Machinery, University of Tehran, karaj, Iran ,
Abstract :
One of machines that whose operator is exposed to large magnitude of hand-arm vibration is chain saw. Some studies are accordance whit this. These vibrations can cause vascular, neurological and musculoskeletal disorder, collectively named as hand-arm vibration syndrome. Main sources of vibration for this machine are single cylinder engine and the interaction of the chain with the wood being worked on. Current study was done to investigate the effect of engine speed and Species of wood on the vibration of front handle of 070-stihl chain saw during the cutting simulating tree. The result showed that the effect of different operation, different axes and different speeds on the value of RMS acceleration was significant at 1% level. The peak of frequency spectrum was in the frequency in accordance with the hook of piston. By change in species of wood occasionally the peak frequency was shifted to other centre frequency between the range frequencies of 63Hz to 100 Hz.
