Pneumatic Firearms Emission Principle Problem

This dissertation focuses on an exploring research about related questions of pneumatic gun firing principle. Pneumatic gun uses compressed gas as firing energy. Projectile or related object is impeled by expansion work and fired along the firing tube.Firstly, on the basis of pneumatic gun firing principle, the basic concept of pneumatic gun is given in this dissertation. The structure and work processes of pneumatic gun is completely described by using a modular design demonstration. Simultaneously, the pneumatic gun work processes include two core processes-gas valve work process and projectile firing process. Then, the following research is dead against these processes. The action mechanism of gas valve work process is analysed. Through the analysis on energy of hammer spring and gas valve spring, the determination methed of stroke and replacement energy is obtained. Secondly, the analysis model about projectile firing process is established. By using Runge-Kutta method and Matlab software, the analysis model is computed. The computation result includes: gas bottle pressure curve, high-pressured channel pressure curve, bore pressure curve, projectile displacement curve and projectile speed curve. By changing the value of gas bottle initial pressure, projectile quality, barrel caliber, barrel length, high-pressured channel diameter, high-pressured channel length, projectile initial point and so on, the influence rule of shooting performance is analysed. In view of string firing, gas bottle pressure drop causes unstable shooting performance. Improvement measure is proposed. The research results of this dissertation may supply the reference for following related research.