The thermal management system of new energy vehicles directly affects the overall vehicle performance

placing stringent demands on the performance and reliability of the scroll compressor for air conditioning

with particular emphasis on the mass imbalance response of the scroll compressor drive shaft for its performance and service life.For a certain type of scroll compressor drive system with a design speed of 0~7000 r/min

based on the distributed mass model

the intrinsic characteristics of the shaft system and the unbalance response at different speeds were analysed by using the modal method.Considering the robustness of the simulation speed setting

the rotor system was set at 0~7000 r/min

and the first six orders of the intrinsic frequency

vibration mode and the positive vortex criticality were obtained.The first six orders of intrinsic frequencies

vibration mode and critical speeds of positive eddy currents were obtained for the rotor system at 15452 r/min and 32839 r/min

and the deformations and stresses of the spindle eccentric pins

the balancing block and the tail section were analyzed by the harmonic response analysis under the excitation of the gas loads to obtain the variation of the frequencies.Finally

the prototype was experimented

and the measured acceleration time-domain and frequency-domain response curves were obtained.The results show that the scroll compressor does not reach the critical speed under the design speed of 0~7000 r/min;the unbalanced vibration at 271.96 Hz and 517.01 Hz and its side frequency has a greater impact on the rotor

which is consistent with the results in the harmonic response analysis.The study provides a reference for the vibration finite element analysis and structural optimization of the scroll compressor.