引信双自由度后坐保险机构理论研究

【作者】 曹莹；

【导师】 王雨时；

【作者基本信息】 南京理工大学 ， 机械设计及理论， 2007， 硕士

【摘要】 发射过载较小的火箭弹、追击炮弹和无后坐炮弹发射时的后坐力要远小于跌落时的冲击力，这增加了引信后坐保险机构识别发射环境和跌落环境的难度。如何有效解决勤务处理安全性与发射解除保险可靠性之间的矛盾成为低发射过载环境下引信后坐保险机构设计的难点。双自由度后坐保险机构是一种结构简单、成本低廉、工艺性好的引信后坐保险机构。建立了引信双自由度后坐保险机构的动力学模型，利用数值算法分段解算双自由度后坐保险机构的运动微分方程组，根据得出的位移响应结果详细分析了机构的运动过程。运用数值模拟和软件仿真对前人文献中给出的4组设计参数进行了分析和比较，结果表明用龙格-库塔法分段解算运动微分方程组的方法能够正确得出机构的位移响应，从而真实地反映机构的运动过程。从理论上论证了双自由度后坐保险机构应用于极低发射过载环境(100g)的可行性；总结了极低发射过载下该类机构设计参数选取的规律。另外，对炮弹后坐过载曲线的拟合问题也进行了分析，用Logistic曲线以适当精度来拟合炮弹的内弹道曲线。对76种国产制式火炮弹药内弹道曲线拟合的结果表明，Logistic曲线能够较好地拟合内弹道的行程—时间曲线和速度—时间曲线。通过对大量拟合实例的分析和总结，得出了拟合内弹道曲线的Logistic函数通用公式。更多还原

【Abstract】 The setback force of Rocket, mortar and recoilless gun in launch environment is far lower than impact force in drop environment, which increased the difficulty of distinguish from the launch environment and the drop environment. How to resolve the contradiction between reliability arming in launch and the safety in handling transportation and storage became a difficult problem in the design of setback arming mechanism of low velocity projectile.Two degree of freedom setback arming device is a classical setback arming device, which have the advantages of simple structure, low cost and machining convenience. The dynamic model of two degrees of freedom setback arming device is established. The movement of this setback arming device is analyzed particularly by solving the differential equation with Runge-Kutta method. The numerical analysis and computer simulation is used to compare four data of two degrees of freedom setback arming mechanism which were get from previous product. The results indicated that this analysis method could truly describe the movement of the mechanism.The feasibility of two degrees of freedom setback arming mechanism which is used in low overload (100g) is proved. And the selection of design parameter for this device is summarized.Otherwise, the curves of gun’s interior ballistic are also researched. The Logistic curve is used to fit displacement-time curve and veloeity-time curve with appropriate precision. A large number of analysis and summing-up of fitting indicated that Logistic curve could fit the two curves well. Finally, the general Logistic formula is summarized to fit the displacement-time curve and velocity-time curve.更多还原