Analysis of Dynamic Characteristics of High-Speed Cycloidal Gear Pump Rotor Based on Thermo-Fluid-Solid Coupling
In order to solve the vibration problem of gear pump caused by flow field and compensation force under high-speed working conditions,the high-speed cycloidal gear pump was taken as the research object,the effects of flow field temperature,flow field pressure,motor torque and radial compensation force of sliding bearing on the rotor performance were analyzed.Based on the thermal-fluid-solid coupling method,the 3D model of the high-speed cycloidal gear pump was established,and the multi-physical field cou-pling analysis of the rotor was carried out by using the coupling module in ANSYS Workbench platform to determine whether the critical speed met the design requirements.The results show that the flow field temperature affects the deformation of the rotor to a greater extent than the torque and the flow field pressure,indicating that the temperature field is the main cause of the rotor deformation.At the same time,in the case of thermal-fluid-solid coupling,the amplitude of bending and torsion of the rotor increases and the natural frequency decreases greatly,indicating that the thermal-fluid-solid coupling has a significant effect on the natural frequency of the rotor.The criti-cal speed of the rotor is 96 600 r/min,which is much higher than the designed speed.
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