Study On The Vibration Reduction And Optimization About The Rotor System Of Electrical Scroll Compressor

When the electric scroll compressor is operating,the faster the rotor is,the more violent the compressor vibrates,which reduces the performance of the whole machine.The previous researches on the compressor always focused on the kinematics or dynamics characteristics,but not on the influence relationship between design factors and rotor characteristics.The paper analyzed the kinematics or dynamics characteristics and rotor parameterizational model in a simulated way,found out the influence relationship between the design factors of every parts and the rotor kinematics and dynamics characteristics,built an approximate model of rotor system through considering the rotor kinematics and dynamics characteristics in a full way,and finally completed the research on the vibration reduction and optimization of the rotor system.The detail is following:Completed the dynamic balance design of rotor system based on the operation principle of the electric scroll compressor and the structure features of the rotor system,built a three-dimensional model of the rotor system and imported the multi-body dynamics software ADAMS,analyzed the kinematics characteristics of the whole rotor system and the main parts and what influence the rotation speed has on the kinematics characteristics of the rotor system.Built a parameterizational model of the rotor system with ADAMS,collected sample points in the feasible rotor design space by means of Latin hypercube sampling method,analyzed the rotor kinematics characteristics of different virtual prototype in a simulated way.Built the finite element analysis model of rotor system based on the theory of modal analysis and rotor dynamics,and analyzed the rotor dynamics characteristics of rotor system ANSYS Workbench in a simulated way,extracted the first six modes and Vibration diagram,and analyzed the Campbell diagram of rotor system in a simulated way.Parameterized the variables in the structure of the rotor system parts with Design Modular,established an approximate model of rotor system based on the approximate model theory,analyzed the dynamics characteristics of the approximate model with ANSYS Workbench in a simulated way,obtained the influence relationship between design variables and rotor dynamics characteristics and the interactive relationship among the design variables.Built an approximate model of rotor system of scroll compressor with multidisciplinary optimization software ISIGHT through considering comprehensively the kinematics and dynamics characteristics of the rotor system and finished the accuracy test.Optimized the module with ISIGHT,the rotor center of mass displacement offset as the restriction,targeted to improve rotor modal and lightweight,sought for the best solution in feasible design space of the the rotor system,finally finished the research on the rotor vibration reduction and optimization.The research showed that in the research on the rotor dynamics characteristics,,and the amplitude in Y axis was largest to 0.63 mm and that in Z axis was largest to 0.53 mm.The displacement of center of mass of the main bearing and auxiliary bearing was 0.055 mm and 0.052 mm respectively when the compressor was operating,bearing a stress of 5432.94 N and 5126.66 N respectively,and the center of mass of moving disk bearing had a small displacement and stress.The amplitude and rotation speed of the rotor system had a linear relationship,and when the rotation sped up,the displacement of center of mass of the whole system would increase.The moving scroll,large balance weight and small balance weight all had an impact on the vibration offset of rotor system,among which the moving scroll influenced the most,and its contribution value in the Pareto contribution diagram was 55.84%.Among the main bearing,auxiliary bearing and moving disc bearing,the bearing stiffness of the auxiliary bearing had the largest influence on the vibration offset of the rotor system,and its contribution value in the Pareto contribution diagram was 84.58%.It's needed to pay more attention to the parameter setting of the moving vortex disk and the auxiliary bearing in the design of compressor vibration reduction optimization.In the research on the rotor dynamics characteristics,there was a resonance point in the rotor system when the rotation speed was between 7200 to 12000 r every minute,and the critical speed was 9997.8 r every minute,the mass of large balance weight had a largest impact on the rotor dynamics characteristics.Optimizing the rotor multidisciplinary approximate model with ISIGHT optimization module,the mass reduced from 9.1154 kg to 8.9747 kg,and the overall bob-weight reduced 0.1407 kg.The modal natural frequency increased from 455.37 Hz to 480.25 Hz.The vibration reduction and optimization of the rotor system of the electric scroll compressor finished.