繩系衛(wèi)星系統(tǒng)動力學與展開規(guī)劃問題研究
[Abstract]:Tethered satellite system is a spacecraft system composed of two or more satellites connected by tethered satellites. Tethered satellites have broad application prospects in space environment detection and space debris removal. Considering the complicated space perturbed environment and its attitude-orbit coupling motion characteristics, the dynamics and control of tethered satellite system are difficult to some extent. The release and recovery strategy of tethered satellite has always been the focus of research in this field. In the process of release and recovery of rope satellite, the change of rope length will lead to large-scale oscillation in and out of orbit of the system. Therefore, combined with the dynamics and kinematics characteristics of tethered satellite system, Rational planning of the release process and stability of the system is the key to the on-orbit operation of tethered satellites. In this paper, according to the requirements of the release mission of tethered satellite system, the existing projects of tethered satellite system at home and abroad are investigated, and the methods of dynamic analysis and control strategy design of tethered satellite system are summarized. The dynamics modeling, analysis and release planning of tethered satellite system are further studied. The main contents of this thesis are as follows: firstly, the dynamic models of two-body and multi-body tethered satellite systems are established by using Lagrange equation; In the process of modeling the two-body system, a general system model is obtained by taking the rope system as a linear elastomer with uniform mass distribution. Then the two-body system is extended to a multi-body system, and the dynamic characteristics of the radiative and beaded multibody systems are analyzed by comparing the two-body system with and without the master star attitude in the model. On the basis of the two-body dynamic model, the mathematical model close to the real rope and the method of accurately calculating the tension are obtained by introducing the deformation coefficient of the rope. The uniform velocity and uniform acceleration of the system are studied in combination with the tension moment and the gravity gradient moment of the rope system. The motion of the rope system and the attitude of the master star in exponential expansion. The convergence rate and stability of rope and star attitude under different expansion strategies are analyzed by numerical simulation, and the constraints of power exponential expansion stability are given. Then, combined with the modeling and analysis results of the two-body rope system, the orbit parameter variation of the electric rope deorbiting process under the condition of the rope attitude change is studied. According to the attitude dynamics model under Lorentz force and the high-order international geomagnetic field model, the calculation method of Lorentz force and Lorentz moment in the process of rope movement is analyzed. Combined with Gao Si's perturbation equation, a numerical simulation model for derailment of electric rope system is established. Under the conditions of no swing angle, only in-plane swing angle and inside-out swing angle, the simulation and comparison of the deorbit process of electric rope system are carried out. Finally, the release planning problem of the two-body system is extended to the multi-body system. The unfolding dynamic characteristics of the radiative open-loop tethered satellite system and the vibration suppression after the deployment are studied. A uniform and variable acceleration deployment strategy is designed for the radiation system without considering the attitude of the master star. The relationship between the deployment efficiency and the terminal vibration is analyzed and verified by mathematical simulation. For the radiation system considering the attitude and geometric dimension of the master star, the control strategy of gravity gradient compensation and non-compensation is designed. For the oscillation of the unfolded rope system, a phased open-loop expansion is proposed. The closed-loop vibration suppression control method makes the system run stably after completion. The effectiveness of the proposed deployment control strategy is verified by building a simulation model.
【學位授予單位】:北京理工大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:V448.2
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