Jixie chuandong (Mar 2021)
Stiffness Optimization of Parallel Suspension based on Inter-chain Coupling
Abstract
For the improvement of off-road vehicle seat stiffness， a scheme of using parallel mechanism as the main structure of the seat suspension is proposed. The coupling between chains and the natural frequency are studied to ensure that the suspension mechanism has high precision and high stiffness. Firstly， generalized mass and generalized stiffness matrices of the mechanism can be obtained by means of energy method， virtual work principle and disturbance theory. Secondly， elastic coupling and inertial coupling are two indexes defined based on the above two generalized matrices to measure the coupling degree of the parallel mechanism. Cholesky decomposition method is used to obtain the natural frequency of the mechanism. Then， in order to obtain the small elastic coupling， the inertial coupling and a large natural frequency， the natural frequency is used as the objective function to optimize the structural parameters of the suspension mechanism. Finally， the optimization results are comprehensively analyzed and the optimal structural parameters are obtained to improve the structure of the device.
