Primary Research On Towed Flight Dynamics

This paper relies on country 863 project" taking off levelly, two stage to orbit and transatmosphere flight vehicle system design", research towed flight dynamics primarily, development for our country air launch technology of carrier rocket, offering the essential technological reserve. Through calculating and analyzing basic performance, the flight characteristic of the towed system is researched. Stability and control issue of carrier rocket is discussed primarily. The net result of the thesis will prove the feasibility of the scheme of towed launch. Combining the above research purpose. This thesis has carried on the following job:At first, familiar with structure and function of towed system. Have put forward the schemes of five kinds of setting-up models by analysis to towed flight, concrete course and basic theories of scheme carry on the simple narration on each, compare their pluses and minuses. Combine with study the purpose, the suitable method towed systematic modeling way is chosen.Secondly, towed system is considered as many rigid body systems. According to research approaches of many rigid body systematic dynamics, The towed systematic engagement calculating models is derived; according to actual course of the towed flight, deriving mathematics model of the course of taking off and towed flight of the towing plane and of carrier rocket, and corresponding parameter calculate models.The third part, familiar with the frame of the emulation software VPM. Making use of user' s module offered by VPM, write the emulation procedure of the towed flight. According to purpose of the towed flight, a new trajectory consisting of taking off, climbing phase, level flight phase is presented with. Trajectory pitch angle of the towing plane is optimized. According to the flight law of the towing plane, the fin deflection angle and amplification coefficient of particle-system trajectory of carrier rocket are designed, in order to realizing flight steadily of the carrier rocker. Finally, one trajectory meeting the height and the speed of towing flight is designed.Finally, according to the towed systematic characteristic, the concrete performance computing method is put forward. Making use of this method, theperformance of taking off, level flight and the state of the towed rope are calculated. Utilize data processing method, two groups of data of the towed plane is compared. Characteristic of the towed system is analyed.Research work of this thesis offers preliminary basis for the scheme of towed launch. At the same time, the result of performance calculation and performance analysis has important reference value to determining overall scheme of towed launch.