Basic Research on the Vibration and Noise of Internal Combustion Engines. 5th Report, Vibration Analysis and Prediction of Actual Responses on the Whole Structure.

概要

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The purpose of the study described in this paper is to analyze and predict the vibration response of an ICE (internal combustion engine). Firstly, all components of the ICE are modelled by the finite-element model, and their dynamic characteristics obtained by component mode synthesis or multiple component mode synthesis are checked by comparision with experimental results. Secondly, the dynamic characteristics of a FE model of the whole system synthesized by MCMS are compared with experimental results to verify the accuracy of the analyzed results. Thirdly, a computational prediction of the vibration characteristics, in the case that the supplementary parts are added to the original engine, is carried out and compared with an experimental result. In addition, the overall level of the force occurring at intake/outlet valve setting points is experimentally estimated for the purpose of application as a factor of excitation forces in the engine on operation. Then, by using the FE model and the estimated force at a valve setting point, a simulation of the forced vibration is carried out with MCMS, and it is shown that the results correspond well with experimentally obtained ones.
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