Refrigerant-Born NVH Source and TPA Prediction for EV Electric Scroll Compressor
This paper presents a novel methodology for predicting refrigerant-born NVH(Noise, Vibration and Harshness) sources in electric scroll compressor. The approach begins with the development of a comprehensive scroll geometry thermodynamic model capable of simulating refrigerant behavior at thousands of hertz scales. Thermodynamic properties of refrigerant are applied, and the dynamic movement of scroll is modeled by using the scroll geometry parameters . This results in the calculation of the scroll volume, which is subsequently converted into dynamic forces on the scroll surface. The kinematic structure of the electric scroll compressor is then analyzed, and a kinematic model is developed to predict the dynamic force outputs. These dynamic forces serve as inputs for NVH prediction, performed using structural FEM (Finite Element Method) analysis. The model's accuracy is validated using industrial testing data by 1.5% error for 1st order frequency, and it provides a reliable tool for virtual NVH evaluation in EV’s refrigerant electric compressor.