The exciting force measuring equipment is designed to transform supporting system of the reciprocating internal combustion engine into the perfect uncoupled system and separate six components of the exciting force from the vibration acceleration so that quantitative measurement can be taken. Moreover, as the result of the exciting force calculating programs considering speed fluctuation the calculated value agreed well with the measured value, and thus the property of the calculating method was proved. In addition, the application of the results of calculation to vibration isolation design produced good results on the vibration response prediction, so that the possibility of becoming an effective means in predicting vibration during design procedure was confirmed.
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