【作者】 王鹏；

【导师】 夏刚；

【作者基本信息】 国防科学技术大学 ， 航空宇航科学与技术， 2011， 硕士

【摘要】 拖曳式诱饵系统(Towed Decoy System)是一种机载电子或红外反制系统,由飞机—拖缆—弹体三个部分组成,主要用于保护载机平台,提高了作战飞行器的生存率。因此研究此系统有着重要的现实意义。为分析拖曳式诱饵弹系统在释放过程中的运动稳定性问题,需要对诱饵弹弹体及拖曳绳索的动力学特性进行仿真分析。本文首先综述了拖曳绳索释放动力学研究领域的国内外发展概况,然后介绍绳索动力学中三种主要的建模方法:质量—弹簧阻尼模型、多刚体模型、连续体模型,并推导了相关动力学方程。而后建立了拖曳式诱饵弹弹体的六自由度动力学模型,对于弹体所受的气动力采用流固耦合方法来求解。通过建立拖曳绳索的多刚体模型与质量—弹簧阻尼模型,仿真分析了五种不同工况下的释放过程中诱饵弹弹体的运动轨迹、速度、姿态、拖曳绳索的张力以及作用于诱饵弹的气动力等动力学问题,总结了释放过程中的一些特征状态数据,通过对比两种模型的计算结果验证模型的有效性,进一步将仿真结果与光学测量分析所得的数据对比,验证计算结果的正确性。最后建立了拖曳绳索的连续体模型,分析了释放完成后的绳索位形变化,仿真研究了拖曳式诱饵弹系统中的参数变化对释放完成后绳索位形的影响。本文研究了拖曳式诱饵弹系统释放过程中诱饵弹弹体以及拖曳绳索的动力学特性,仿真结果可为拖曳式诱饵弹系统的释放安全设计及释放过程稳定性问题提供借鉴。更多还原

【Abstract】 Towed Decoy System is a electronic or infrared anti-attack system composed of three parts: plane, drag cable and bullet. It is utilized to protect the carrier aircraft in order to promote its viability. Therefore it is significant to carry out an in-depth investigation into the Towed Decoy System. For the sake of analyzing the stability of Towed Decoy System when it is released, the dynamic characteristics of the decoy and the drag cable is analyzed.Firstly in this thesis, the investigation status of drag cable release dynamic is summarized. Secondly, three main modeling methods of rope dynamics which are mass-spring- damp model, multi-rigid body model, and consecutive body model, are introduced, respectively, and the dynamic functions are constructed. Then a 6 DOF dynamic model of towed decoy is built. The aerodynamic force s solved by the Fluid-Solid-Integral method Towed decoy’s trajectory, velocity, gesture, strain on the drag rope and the aerodynamic force is evaluated and analyzed under 5 different situations during releasing process based on multi-rigid model and mass-spring-damp model is established, The solution is validated by comparing the simulation solutions and the experimental data. Finally, the consecutive model is established, and the gesture of the Towed decoy is evaluated, the effects of the parameters in shaping the cable are also discussed in this paper.The dynamic characteristic of the towed decoy and the drag cable of Towed Decoy System during releasing process is investigated in this thesis. And the algorithms and results can provide reference for the design of the Towed Decoy System.更多还原