| dc.description.abstract | In this study, a particle damper (PD) is proposed to configure particles according to the dynamic balance of the workpiece to achieve the dual effects of counterweight and vibration suppression at the same time. Firstly, the rotary compressor model is established through Multi-Body Dynamics (MBD), which considers the change of the circulating gas load, the stiffness, and the damping of the bearing and rubber. Experiments verify the trend and magnitude of vibration at the rotating frequency to confirm the reliability of the model. In the future, this model will be used to study the dynamic balance and vibration suppression of the rotary compressor with PD (new design).
The discrete element method (DEM) and MBD are used for two-way coupling to obtain the dynamic simulation results of the rotary compressor with PD (new design). Firstly, the dynamic balance verification of the rotor system is carried out for the rotary compressor, and the influence of gas load is not considered. According to ISO 1940, the dynamic balance level of the rotary compressor needs to be lower than G 2.5. Through PD, the dynamic balance level of the rotor system can reach G 0.31.
The new design is simulated and compared its vibration suppression effect with the original design (top weight) to confirm vibration suppression effect. The different particle sizes, friction coefficients, and restitution coefficients on the vibration suppression of rotary compressors were discussed. The new design has the vibration suppression effect under different particle radii, among which the particle radius of 1 mm is better than other particle diameters. With the increase of particle friction coefficient, the smaller the total kinetic energy of the new design, indicating that the more significant the friction energy consumption, the better the vibration suppression effect of PD. With the increase of particle restitution coefficient, the greater the kinetic energy of the new design, the smaller the collision energy consumption, and the worse the vibration suppression effect of PD. Finally, the actual vibration value of the new design is verified through experiments. The radial acceleration can be reduced by 9.7 % on average, and the tangential acceleration can be reduced by 2.46 % on average, confirming the vibration suppression effect of PD. | en_US |