The aerial dispersing interior ballistic processes and the computational method of submunition exterior ballistic initial conditions of cluster munition dispersing with piston maximum travel limit were explored,ballistic models of dispersion were established and the numerical simulations were performed by the models.

The paper analyses several questions of annular BOP design which must be paid attention, for example, the determination of piston stroke; the stroke mating of piston and entity; and the sealing between piston and entity.

Since both the structure and the operating parameters of a d iesel engine change nonlinearly,the heat load and heat rad iation area are d irectly influenced by the ratio of piston stroke to cylinder d iameter(S /D).

A method was developed to measure the piston stroke and to determine the static and dynamic characteristics of a variable displacement compressor.

Optimum design of cylinder diameter and piston travel for intermediate-speed and high-speed internal combustion engine;