抄録
Authors measured and analysed the sound pressure level and frequency spectrum on the noise of power tiller. Even if the sound pressure level passes the Automobile Standards in Japan, operator ought to work under fairly intense noise level, which amounts to 90-100 decibel. Such noise can cause temporary threshold shift especially at the frequencies around 4000c/s.
The noise of power tiller mainly consists of exaust note and mechanical noise from engine and gear box, however, as the velocity of engine increases, noise from secondary noise source grows rapidly.
