Studies on the vibration of agricultural engine. (IV)

On the absorption of engine vibration of the Foundation Frame with the rubber absorber

Abstract

On the vibration isolation of the agricultural engine, I studied the vibration isolating method with used the rubber absorber on the Foundation Frame within doors. The rubber absorber which used to this experiment, is the trapezoidal cylindrical type with 57kg/cm spring constant, and the circular plate type with 120-180kg/cm spring constant from the compression, test.
The resonant limit was calculated with the theoretical formula of compressive and shearing direction of rubber. Stillmore, it was added the damping ability to this, requested the transmissibility and calculated the transmitting force through the rubber of “Katsura” engine vibration force. At this results, the resonant is 500 engine r. p. m. in compressive direct. and 200 r. p. m. in shearing direct. at the trapezoidal cylindrical type, 700-800 r. p. m in compressive direct. and 400-500 r. p. m. in shearing direct. at the circular plate type. When the damping ability was considered, the resonant point was fall down but I known that this is unnecessary under high speed driven.
On the experiment, rubber was disposed in many ways and it was measured for engine and frame vibration amplitudes, then it was inspected for this result of each direction and compared the theoretical consideration with another.