Design and Mechanical Performance Analysis of Two-Stage Flexible Damping System

With regards to the mechanical environment not meeting operational requirements, several steps are taken to address the issue of local amplification of vibrations in individual instruments caused by secondary isolation. Firstly, regarding the metal rubber double-layer isolation system, the flexible stiffness of the mounting plate is fully considered, and a secondary vibration reduction system model with both flexibility and rigidity is established. Secondly, based on the target frequency, the frequency response function of the secondary vibration reduction system is decoupled systematically to solve for the stiffness of the damper. Finite element analysis is then employed for random vibration analysis to validate the feasibility of the theory model of the composite secondary isolation system. Finally, the experimental verification is conducted using a vibration table. The results indicate that when the secondary isolation system meets the engineering stiffness requirements and its first natural frequency is below 40 Hz, the vibration reduction efficiency can reach over 70%. Experimental results are generally consistent with the simulation results. © 2024 Nanjing University of Aeronautics an Astronautics. All rights reserved.