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;