高超声速飞行器弹性振动抑制方法研究

Stabilization of Elastic Vibration for Hypersonic Vehicles

分析了静不稳定高超声速飞行器弹性振动与飞行控制系统之间的耦合机理,进而研究机体弹性振动抑制方法。建立弹性高超声速飞行器耦合模型,针对静不稳定特性设计角速率稳定回路,并从时域和频域研究弹性振动与角速度稳定回路的耦合机理;提出一种新型综合相位稳定方法,该方法在达到传统弹性振动相位稳定要求同时保证弹性模态最大能控性指标,得到一种新的敏感元件位置配置准则。仿真结果表明,该方法能够保证飞行器的稳定性,与采用增益稳定和普通相位稳定方法相比,能更好地快速抑制弹性振动。

The interactions between structure elasticity and flight control was analyzed, and aeroservoelastic stabilization techniques for statically unstable hypersonic vehicles was developed. First, a nu- merical model with aeroelastic modes was presented. Then, a pitch rate stabilization control system was designed, and the interactions between the structure flexibility and flight control system were investigated. A new phase stabilization technique was proposed. The essence of this approach is the manipulation of the sensor location with the intent of phase stabilization as well as maximizing controllability of the elastic modes, based on which, a criterion of locating sensors was created. The results of the simulations show that the closed loop stability could be guaranteed by the proposed approach. Compared to the gain or phase stabilization technique, the proposed approach is shown to be faster and more effective to suppress structure vibration.