轴对称矢量喷管作动系统矢量偏转受载特性研究

针对轴对称矢量喷管实际工作时A9作动筒负载未知问题,提出了结合轴对称矢量喷管空间运动学模型和矢量偏转CFD模型的耦合建模方法。首先根据CFD计算求解喷管扩张调节片受载情况,然后由运动学模型确定偏转过程各调节机构空间位姿,最后结合受力分析、力矩分析建立矢量喷管A9作动系统受载分析力学模型,解得A9作动筒受载情况。仿真结果表明:随着发动机工作状态的增加,完成相同的矢量偏转角度,A9作动筒输出力不断增大;A9作动筒输出力随矢量偏转角增大而增大,随矢量方位角变化呈现正弦周期性变化。该方法可为矢量喷管作动系统地面加载试验提供载荷谱,具有重要的工程应用价值。

Research on Vector Deflection Loading Characteristics of Axisymmetric Vector Nozzle Actuation System

In order to solve the problem of unknown load on A9 actuator when axisymmetric vectoring nozzle is working, a coupling modeling method combining the space kinematics model of axisymmetric vectoring nozzle and the vector deflection CFD model is proposed. Firstly, according to the CFD calculation, the load condition of the nozzle expansion adjusting plate is solved, then the space posture of each adjusting mechanism in the deflection process is determined by the kinematic model. Finally, combined with force analysis and moment analysis, a mechanical model for load analysis of the vector nozzle A9 actuation system is established, and the load condition of the A9 actuator is obtained. The simulation results show that the output force of A9 actuator increases with the increase of the engine working state at the same vector deflection angle, and the output force of A9 actuator increases with the increase of vector deflection angle and shows sinusoidal periodic change with the change of vector azimuth angle. This method can provide a load spectrum for the ground loading test of the vector nozzle actuation system, which has important engineering application value.