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In this paper, a novel recursive method to identify the moment of inertia parameters of on-orbit spacecraft is proposed. Different from the frequently-used momentum conservation and least squares approach, the presented method is implemented based on the Projection Approximation Subspace Tracking (PAST), and the moment of inertia parameters can be determined recursively from the system state-space...
A novel parallel micromanipulator with large range of motion based on flexible hinges is designed and analyzed in this paper, which has three degrees of freedom motions along x, y and z axes. The Pseudo-Rigid-Body (PRB) model method is applied to obtain the kinetic performance and inputting stiffness. To calculate the natural frequency of the mechanism, the Lagrange method is used to achieve the dynamic...
Based on elastic aircraft, time-domain continuous gust response analysis using rational function approximation technique and time-domain discrete gust response analysis using hybrid modeling technique are presented. Two gust alleviation control schemes are designed: (1) the feedback signals are gathered by pitch rate gyroscope and accelerometers, which are located at the tip of the wing and the centroid...
A nonlinear optimal control strategy is formulated to design optimal continuous low-thrust transfers between three dimensional Halo orbits in the vicinity of the second libration point of the Sun-Earth system. The nonlinear optimal control method based on the circular restricted three-body problem model, which uses the dual variable principle, is transformed into nonlinear algebraic equations for...
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