This paper discusses the conception of ideal shock input mode and the principle of kinetics equivalent,connects the principle and shock test logically.

The experiments of percussive penetration into rock plates at low velocities were made.

A study on water impact of recovery module was carried out by means of a simulation method.

On the basis of meshing impact dynamics model in gear transmission established in document [1], and by means of theoretical analysis and compiling corresponding analytical program, the impact force of meshing and the variation status of impact speed in the transmission of involute spur gears were calculated.

The characteristics of meshing impact is improved by using meshing analysis procedure in FORTRAN language so that such gears will have low-noise performance.

It is found that the chain/sprocket meshing impact is reduced and the transverse vibration of chain is decreased by applying the new sprocket.

In order to ensure thatair-drop mine fuse safety unit can act effectively while air-drop sea mine enters water, we need know theimpingement acceleration signal peak value and pulse width of the air-drop mine in the process of entiretrajectory impingement such as opening an umbrella overhead , impinging entering water an.