Study on the Vibration Reduction of Internal Combustion EMU Powerpack Frame under Multiple Loading Conditions Based on Particle Damping

Reducing bogie vibration is beneficial to control the stability of high-speed train body and prolong the service life of the structure. It is of great significance to the research of vibration reduction of power package frame. The vibration reduction of a power pack bogie frame is studied based on particle damping. The dynamic characteristics of the bogie frame are analyzed by combining the finite element method and modal experiment, and the installation location of the particle damper is determined. The discrete element model of particle system-bogie frame is established, and the energy dissipation values corresponding to different damping particle parameters are calculated, and the optimal damping particle parameters of bogie frame under given working conditions are obtained.The particle damper is designed, manufactured and installed according to the optimal parameters. The vibration acceleration of the bogie frame before and after vibration reduction is compared and analyzed on the power pack experimental table. The results show that the vibration amplitude of the bogie frame decreases by 60.7% vertically under the target working condition, and the vibration reduction effect of the vibration acceleration amplitude of the bogie frame varies from 15.5% to 67.4% in other gears. The average vibration reduction effect is 49.33 %. This provides a new method and design criterion for the vibration reduction of the bogie frame and other parts of the high-speed train.