Validation of compliant contact force models for low coefficient of restitution impact

Abstract

Low coefficient of restitution impact occurs frequently in agricultural machinery systems. In recent decades, many compliant contact force models have been proposed. However, there are no experimental validation studies for low coefficient of restitution impact problems. Based on this, this study conducted impact experiments using the tobacco main vein and the rubber ball as impact bodies to verify the accuracy and applicability of the contact force models for low coefficient of restitution impact. Firstly, A drop tower test rig was built to measure the coefficient of restitution and the impact force at different pre-impact velocities. Then the measured value of the coefficient of restitution was brought into some typical contact force models to simulate the impact process. Finally, the simulation results were compared with the experimental results. The comparison results showed that the Flores et al. model, the Gharib-Hurmuzlu model, and the Yu et al. model could describe the impact process relatively better. This study can provide a reference for the description of the low coefficient of restitution contact-impact problems. • Experimentally validating the accuracy of compliant contact force models. • Prediction error of the peak impact force is less than 30%. • Using rubber ball and tobacco main vein as impact bodies. • The measured value of the coefficient of restitution is less than 0.6.