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.

Automated summary

This paper designs a mechatronic shock absorber based on a ball screw pair, which can produce a large damping force under the same working conditions. The dynamic model of the mechatronic shock absorber is established, and the damping force is divided into inertial, electromagnetic, and mechanical damping forces. The global sensitivity analysis method, Sobol based on variance, is used to analyze the sensitivity of various parameters. The results show that the load resistance has the greatest impact on the equivalent damping coefficient. The optimal range of load resistance under different structural parameters is proposed for vehicle ride comfort. Experimental tests are conducted to validate the dynamic model. This work provides a theoretical basis for guiding the future design of mechatronic shock absorbers.