Influence of cycle times on the simulation results of main bearing wear

DU Xiang-ning1, ZHANG Yan-yan2, DIAO Zi-yu2, SUN Nan-nan1, ZHANG Heng-jing3, LIU Zhen-tao2
（1.State Key Laboratory of Engine Reliability, Weifang 261061, China; 2.the Power Machinery &
Vehicular Engineering Institute, Zhejiang University, Hangzhou 310027, China;
3.Zhejiang Fangyuan Test Group Co.,Ltd., Hangzhou 310027, China）

Abstract: In order to investigate the appropriate value of one of the simulation parameters, cycle index in the wear prognosis of main bearing, the method of dynamics simulation and lubrication analysis were applied in the simulation of crankshaft system of internal combustion engine. The coupling model of multi-body dynamics and lubrication of the crankshaft system of a certain diesel engine in service were established. Based on Archard model of wear theory, several groups of cycle indexes were set up for the wear calculation, and a portion of the maximum wear depths and shell profiles of main bearings were selected to be compared and evaluated. The variation law of the calculation results of maximum wear depth with the increase of cycle index was summarized. The results show that index 3 is supposed to be selected in the wear simulation condition in consideration of the cost and reliability of calculation. This study provides guidance and suggestions for the optimization of wear prognosis.
Key words: multi-body dynamics; coupling simulation; wear calculation; cycle index; wear profile