Theoretical modeling and optimal matching on the damping property of mechatronic shock absorber with low speed and heavy load capacity

In this paper, a mechatronic shock absorber based on ball screw pair is designed, which can produce large damping force under the same working conditions, the dynamic model of mechatronic shock absorber is established, in which the damping force is divided into inertial damping force, electromagnetic damping force, and mechanical damping force, respectively. The global sensitivity analysis methodology, named Sobol based on variance, is employed to carry out parameter sensitivity analysis, the parameters of excitation amplitude, frequency, load resistance, motor back electromotive force constant, motor electromagnetic torque constant, lead screw, motor reducer transmission ratio are investigated comprehensively. Results indicate that for the operational conditions, the load resistance has the greatest impact on equivalent damping coefficient; while for the structural parameters, the transmission ratio has the greatest impact on equivalent damping coefficient. Based on the results of parameter sensitivity analysis, aiming at vehicle ride comfort, take a certain type of light truck as an example, the optimal approach of load resistance range under different structural parameters are proposed. Finally, the experimental tests are conducted, and validates the established dynamic model. This work provides a theoretical basis for guiding the future design of the mechatronic shock absorber.