航空拖曳诱饵系统机动过程缆绳张力仿真

Simulation on cable tension of aerial towed decoy system during maneuvers

为解决航空拖曳诱饵系统研制过程中拖曳缆绳强度设计问题,对拖曳诱饵系统机动过程缆绳张力进行了仿真研究。仿真中建立了缆绳的质量弹簧阻尼模型和诱饵弹的六自由度动力学模型,研究了直线加速和机动转弯2个典型飞行动作中缆绳受力情况,分析了载机加速度、飞行高度、缆绳弹性模量、缆绳直径等因素对缆绳张力的影响。结果表明:缆绳中张力大小不仅与诱饵弹、缆绳的气动阻力、重力有关,还与它们的惯性力有关;由于张力在缆绳中传递存在时滞性,机动过程中缆绳张力存在波动现象,波动的剧烈程度与载机加速度、缆绳弹性模量、缆绳直径有关;机动转弯过程中,缆绳会承受一个较大的峰值应力,该应力随着转弯角速度的增大而增大。

To solve the problem of strength design of towing cable during the development of aerial towed decoy system,the cable tension during maneuvers is simulated in this paper.The mass spring damping model of the cable and the six-degree-of-freedom dynamic model of the decoy are established in the simulation.Cable tension during two typical flight maneuvers are studied:the linear accelerated motion and the turning maneuver motion.The influences of aircraft acceleration,flight height,cable elastic modulus and cable diameter on cable tension are also analyzed.The results show that cable tension is related not only to aerodynamic forces and gravity of the system,but also to inertial forces.Due to the time lag during transfer of tension in the cable,cable tension fluctuates during maneuver.The fluctuation of tension is related to aircraft acceleration,cable elastic modulus and cable diameter.The cable is subjected to a peak tension during the turning maneuver,which increases along with the turning angular velocity.