Fuse The Two Degrees Of Freedom Take The Insurance Agencies Theoretical Research

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.