Idle Vibration Analysis and Optimization of a Sport Utility Vehicle

The idle Vibration problem was analyzed and optimized in this paper for the air conditioning eompressor operating. The major contributing frequeney and exeitation source of the Vibration problem were identified by spectrum analysis and the component-independent Operation method. The fan rotor unbalanee caleulation model was established by homogeneous eoordinate transforms method. The transfer prineiple of manufacturing parameters and assembly position to unbalaneed exeitation was clarified. Statistical distribution of rotor unbalanee was calculated by Monte Carlo method. Modal tests and cooling module bushing Vibration model Simulation calculations show that the eooling module System resonance is the main cause of path transfer. The contribution analysis method of fan rotor imbalance was applied to identify the key factors affecting and optimize the rotor unbalanee. The cooling module bushing stiffness was optimized based on genetic algorithm to achieve the modal frequeney Separation. The Validation results of the optimization scheine show that the combination Solution of reducing rotor unbalanee and cooling module modal frequeney Separation significantly improves the idle Vibration. © 2025 Chinese Vibration Engineering Society. All rights reserved.