Abstract
As the agricultural engine is used to work many different load of working machine, I have studied and tested how load is the optimum works on problem of engine vibration-proof.
As first in experimental formura of load test, connect at amplitude and brake horse power. And this formula is comprehended the amplitude of spontaneous measuring points of engine body and foundamental frame. Next, I was doing the theoretical study of load, as a cause of curve. But practically must be calculated a belting under the load to added engine shaking force.
Still more study by combustion state at engine cylinder. It's owing to happen abnormal combustion in cylinder, that cause at small torque, irregular change of atomization of light oil fuel, imprefection at growth of combustion zone. Especially, as comparison of mean effective press, high load is constant press type, hence 1/4 load and it's vicinity are minimum amplitude because it was setting between constant volume type and constant pressure type.
From the stand-point of vibration, as in conclusion, if the forced vibration, which included the natural vibration of engine and frame, is worked under one load depend on force of brake friction, vibration is go away from resonance, so that the minimum compound amplitude at 1/4 load. From stand-point of economical drive, 1/4 load is must effective used at vibration but the this point is drop the fuel consumption and mechanical efficiency, therefore I hope that we must used at about 3/4 load and it's vicinity
