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Nonlinear dynamics of fixed-trim reentry vehicles with moving-mass roll control system 被引量:4
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作者 Yafei Wang Jianqiao Yu +2 位作者 Yuesong Mei Linlin Wang Xiaolong Su 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2016年第6期1249-1261,共13页
Nonlinear dynamic characteristics of a fixed-trim reentry vehicle controlled by an internal moving-mass actuator are analyzed. A traditional dynamic model develops into a five-dimensional nonlinear model using classic... Nonlinear dynamic characteristics of a fixed-trim reentry vehicle controlled by an internal moving-mass actuator are analyzed. A traditional dynamic model develops into a five-dimensional nonlinear model using classic Euler angles and their derivatives as state variables. Based on the nonlinear motion equations, by setting the offset distance of the moving-mass as a variation parameter, the curves of the system's equilibrium points are presented by numerical methods. Then the distributions and approximate analytical solutions of the equilibrium points are obtained by simplifying the model under the condition of small intrinsic angles. The results show that the numbers and values of the equilibrium points are closely connected with the location of the moving-mass. Furthermore, the stabilities of equilibrium points are examined by the Lyapunov's first method and three groups of stable equilibrium points are obtained. Since only one group of the stable equilibrium points is desired, the angular motion of the system may be unstable or stay in an undesired lock-in state when the offset distance of the moving-mass or the attitude disturbance of the vehicle is too large. © 2016 Beijing Institute of Aerospace Information. 展开更多
关键词 Dynamics equations of motion Numerical methods REENTRY VEHICLES
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Yes, Science is Confronted by a Great Revolution
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作者 Smulsky, Jozeph J. 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1994年第2期72-76,共5页
An equation is derived to explain the General Theory of Relativity and the effects of GTR: the rotations of planets' perihilion, deflects of star light by a gravitational mass, and the existence of gravitational w... An equation is derived to explain the General Theory of Relativity and the effects of GTR: the rotations of planets' perihilion, deflects of star light by a gravitational mass, and the existence of gravitational waves. Differentiation was used in the derivation but without the dependence of mass, space and time on velocity. The general postulates that are the bases of the new approach to electrodynamics were stated. 展开更多
关键词 Charged particles Differentiation (calculus) Electromagnetic field effects Electromagnetic waves equations of motion Error analysis Errors GRAVITATION Mathematical models Mathematical transformations Velocity
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