航炮炮舱结构的炮振响应分析

Analysis of Vibration Response of Aircraft Gun Cabin Structure

目的获得航炮发射时炮舱结构的动响应。方法依据火炮发射原理,使用化学爆炸模拟炮口冲击波,建立航炮发射时炮口冲击载荷的表达模型。利用ALE方法处理高压流动空气与炮舱表面的流固耦合问题,通过数值计算获得发射气流冲击载荷作用下炮舱结构的表面压力分布与动响应。利用试验结果,修正载荷与炮舱模型的有关参数。结果计算得到的炮舱动响应与试验结果相比较,误差在可接受范围内。结论建立了一种使用化爆模拟冲击波进行航炮炮舱结构炮振响应仿真计算的技术方法,初步确定了结构危险部位,为后续炮舱结构减振设计创造了条件。

The paper aims to obtain the dynamic response of the gun cabin structure when the gun is fired.According to the principle of artillery firing,the muzzle blast wave is simulated by the chemical explosion to establish the expression model of the muzzle impact load.ALE method is used to deal with the fluid-structure interaction between high-pressure flowing air and the surface of the cabin.The surface pressure distribution and dynamic response of the gun cabin structure under the impact load of launching air are obtained by numerical calculation.The test results are used to correct the relevant parameters of the load and the gun cabin model.Compared with the experimental results,the calculated dynamic response of the gun cabin is within the acceptable error range.Thus,a technical method for calculating the vibration response of gun cabin structure using the simulated blast wave of the chemical explosion is established.which initially determines the dangerous position of the structure and cre ates conditions for the subsequent vibration reduction design of the gun cabin structure.