CSME Conference Proceedings (May 27-30, 2018)
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Browsing CSME Conference Proceedings (May 27-30, 2018) by Author "2aa6066ac3347a96ad3268495fa7bd6b"
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Item Open Access Development Of A Ground Based Testbed For Studying The Libration Dynamics Of Orbiting Tethered Satellite Systems(CSME-SCGM, May-18) Bindra, Udai; Zhu, Zheng HongThis paper discusses the development of a ground based experimental environment that can mimic the libration dynamics of tethered satellite systems. The setup consists of an Air-Bearing Inclinable Turntable (A-BIT), whose inclination and rotation rate can be adjusted independently. Appropriate scaling factors help compare the tethered system in the experiment to that in orbit, both of which experience vastly different magnitudes of forces. The two scenarios also differ in their physical parameters including the length of the tether, the mass of the satellite, and the tension along the tether. The scaling factors are used to compareItem Open Access Lagrangian, Hamiltonian, And Energy-Based Control For Space Tethered System(CSME-SCGM, May-18) Kang, Junjie; Zhu, Zheng HongA typical and useful way to derive the dynamics equation of the tethered systems is by means of the Lagrange’s equations and various dynamic models of different tethered missions are established by the Lagrangian formulation. The Hamiltonian formulation is also widely used in the mechanical systems for its well-known symplectic structure property. With this in mind, the dynamics equation of the tethered system’s motion are deduced by Hamilton’s equations in this research. The relation between the Lagrangian and Hamiltonian is shown by Legendre transformation. The goodness of the Hamiltonian formulation is intuitive to reveal the Energy balance property that corresponds to the passivity property. Furthermore, the Hamiltonian energy function of tethered system is employed for facilitating the controller design. In order to bring the system into operations, the energy based control is to achieve the tethered system for precise positioning. Simulations are used to demonstrate the effectiveness of the designed controller.Item Open Access Vision-Based Relative State And Inertia Ratio Estimation Of Unknown Targets(CSME-SCGM, May-18) Feng, Qian; Pan, Quan; Zhu, Zheng Hong; Hou, Xiaolei; Liu, YongThis paper develops an algorithm to estimate the relative pose, motion, and inertia ratio of an unknown target using stereoscopic vision. First, the positions and velocities of detected feature points on the spacecraft are estimated. Second, the angular velocity and attitude of the target are estimated by the least square method and q-method, respectively. Third, the position and velocity of the center of mass of the spacecraft are recovered. Finally, the inertia ratio is estimated based on the angular momentum conversation using the estimated angular velocity and attitude of the target. Numerical simulations are conducted to demonstrate the proposed algorithm.