A METHOD FOR IDENTIFICATION OF POWERPLANT JOINT PROPERTIES USING FRF DATA AND FEM MODEL

摘要

Vibration characteristics of a powerplant, an importantrnparameter to evaluate the booming noise and the durability ofrneach parts of an automobile is a major field of simulation analysisrnusing the finite element method (FEM). Overall vibrationrncharacteristics, however, depend heavily on the joint propertiesrnwhen it comes to the analysis of complicated structures like arnpower-plant where a number of parts are incorporated. Amongrnother characteristics, it is extremely difftcult to conduct accuraternidentification of the damping characteristics of the joint area,rnwhich had been the result of inaccurate analyses.rnThis paper reports a newly established method to solve thesernproblems through the application of frequency response functionrn(FKF) data and FEM models. Also described is the result ofrnapplication of the method to the evaluation of a transverselymountedrnin-line four-cylinder engine in a front-wheel drivernlayout. The application revealed that the joint properties can bernidentified fairly accurately, which in turn allows reliablernprediction of vibration level.