In order to study the effect of component-dropping-collision on structural response, the constraint condition on displacement imposed by collision is derived and the dynamic equation of collision system is established. The presented method, which combined Hertz-damp model with finite element method, can account for the influence of mass distribution of components as well as the nonlinear stiffness and the energy loss during collision process. Effects of mass, mass distribution and dropping height of component are analyzed based on component-dropping-collision model. The results indicate that neglecting mass distribution of collision body will lead to overestimation of collision effects while collision body is asymmetric along the collision surface normal. The peak of collision load and the duration of single collision are exponential functions of the mass and dropping height of component, and the larger of the mass and the higher of the dropping height, the larger of the peak of collision load, but the duration of single collision becomes longer with the increasing of mass and the decreasing of dropping height. These laws can provide reference for reduction of collision damage.
Key words：component-dropping-collision; Hertz-damp model; mass distribution; nonlinear stiffness; energy loss