Reaearch On The Tether Dynamic In The Releasing Process Of Towed Decoy Missile

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.