In this paper, the contact force between two colliding bodies is modeled by using Hertz’s force-displacement law and nonlinear damping function. In order to verify the appropriateness of the proposed contact force model, the free drop type impact test is carried out for different impact velocities and different materials of the impacting body, such as rubber, plastic and steel. The drop type impact experiment are installed to measure the velocity before impact more accurately, which verify the characteristics of contact force model. The parameters of the contact force model are estimated using the optimization technique. Finally the estimated parameters are used to predict the impact force between two colliding bodies in opening action of the spring actuated linkage system, a kind of switch mechanism for switching electric circuits.

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