计及减振器非线性阻尼的自行火炮车体振动试验及数值模拟

为了研究减振器的非线性阻尼特性对轮式自行火炮连发射击过程中车体振动的影响，基于流体力学和液压基本理论，通过建立减振器的非线性阻尼求解模型，得到减振器阻尼及刚度系数表达式。针对某轮式自行火炮的具体结构特点，推导由减振器引起的悬挂等效阻尼系数和等效刚度系数表达式。同时，对轮式自行火炮连发射击时车体振动进行试验测试。在理论研究和试验研究基础上，对减振器阻尼及刚度系数采用线性和非线性表达式两种状态进行了数值建模模拟。结果表明,考虑非线性阻尼及刚度系数仿真结果与试验结果吻合较好，而采用线性阻尼及刚度系数仿真结果与试验结果存在较大的误差。研究结果表明减振器非线性阻尼及刚度系数对轮式自行火炮车体振动具有较大影响。所述方法可以推广到其他火炮车体振动仿真研究中。

Test and numerical simulation of wheeled self-propelled gun considering nonlinear damp characteristics of shock absorber

To study the affection on the vibration of wheeled self-propelled gun chassis during running firing, a nonlinear shock absorber damper model was built in this paper based on the basic theory of fluid and hydraulic mechanics. And the damping coefficient and stiffness coefficient expressions of the shock absorber were deduced, with its nonlinear damping characteristics included. In addition, according to the specific structural characteristics of wheeled self-propelled gun, expressions to calculate equivalent damp coefficient and equivalent stiffness coefficient were developed. And tests on wheeled self-propelled gun during running firing were done. Based on the tests data and the theory developed, numerical simulations in two conditions, the damping and stiffness coefficient calculated by linear expressions and by nonlinear expressions, were done respectively. The result shows that, simulations in the nonlinear condition match well with the experiments data, but simulations in the linear condition have a deviation to the experiments data. As a conclusion, the damping coefficient and stiffness coefficient has a considerable affection on the vibration of wheeled self-propelled gun chassis. This method can be popularized to studies on the simulation of vibration of other gun chassis.