A nonlinear dynamics model for describing the impact contact state between rotating rod and tube was presented.

The dynamics model of rotating rod string is presented, with the consideration of the impact contact between rotating rod string and well bore which happened in any direction of well depth and well bore circumference.

Through the contact impact arithmetic theory of multi-body dynamics and ADAMS,the dynamic simulation of the gear mesh is specified.

The theory of collision contact was studied,and the parallel indexing cam mechanism was simulated.

The flexible robot system contact-impact dynamics is essentially a time varying, nonlinear dynamic process with variable topology, the key to solve the impact dynamics in the flexible robot system is to correctly establish the contact-impact model.

This paper is concerned with the investigation on contact/impact occuring during the firing of a vehicle-mounted howitzer and its system dynamics by nonlinear finite element method (FEM), which can provide theoretical foundation and design decision for overall design and structural design of such weapon systems.