NUMERICAL SIMULATION STUDY ON DYNAMIC RESPONSE UNDER RUDDER CONTROL
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摘要: 针对超声速机动飞行器舵面操纵动态响应问题,开展了相应的算法研究,建立了适用于模拟舵面与弹体相对运动及弹体气动力动态响应的非定常计算方法和局部动态网格变形技术. 以方形弹超声速绕流为例,验证了所提出的定常和非定常计算方法. 对方形弹舵面操纵的3种基本过程(脉冲、阶跃和谐波) 进行了数值模拟,获得了舵面操纵下导弹的俯仰运动对操纵的响应过程. 研究结果表明,快速的舵面操纵过程,甚至会导致导弹的俯仰运动失稳.Abstract: The vehicle would have a dynamic response process in aerodynamics under a rudder deflecting manipulation. However, this dynamic process is often ignored in current research about the characteristics of rudder manipulation and only the static characteristics such as the rudder's inversed effect and control efficiency are taken into account. It is focused in this paper the dynamic response process about a supersonic maneuvering aircraft under the rudder manipulation. A dynamic mesh technique and unsteady numerical methods are developed to simulate the relative motion between the rudder and the aircraft body and the dynamic responses. Supersonic flow about a square cross-section missile and the flow about a forced pitching airfoil are simulated to verify the numerical methods. Then the rudder manipulation processes of the square cross-section missile under the three generic rudder deflection types (step-type, pulse-type and sinusoid-type) are simulated, and dynamic response of the missile's pitching motion under the rudder control is obtained. The results indicate that a fast rudder control process can even cause instability in the pitching motion of the missile.
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Key words:
- rudder manipulation /
- dynamic response /
- numerical simulation /
- dynamic mesh
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