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Composite Back Stepping Anti-winding Control of Spacecraft with Finite Time Convergence |
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Umair Javaid, Qinglei Hu(Beihang (BUAA) University beijing china, China) |
| The research note proposes anti-unwinding attitude stabilization control of rigid body spacecraft in presence of external disturbance and inertial uncertainties.
In pursuit of our goal, we formulated sliding surface using scalar component of quaternion and developed composite anti-unwinding control law using back-stepping technique (BT), in accomplice with sliding mode control (SMC). Furthermore, state transformation is performed to facilitate application of observer for estimation of lumped uncertainties. Extended state observer (ESO) is used to compensate for external disturbance |
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Model Predictive Control with Cross-Product Term between State and Input |
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Sungmin Cho(The University of Tokyo, Japan), Masatsugu Otsuki, Takashi Kubota(Japan Aerospace Exploration Agency, Japan) |
| Model Predictive Control (MPC) is one of control methods for the discrete time system. The optimum input is calculated by using Linear Quadratic Regulator (LQR). In MPC, the cross-product term is generally omitted in the evaluation function for LQR. However, the effectiveness of the cross-product term for LQR is confirmed by various researches. Therefore, this paper addresses the expanded form of cross-product term applied to MPC. Simulation of zero momentum spacecraft shows that the cross-product term is effective for consideration of performance to MPC. |
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Development of a Benchmark Testbed for Input Shaping Control |
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Mahn-Tuan Ha, Rubayet Hassan, Chul-Goo Kang(Konkuk University, Korea) |
| Input shaping control is an open-loop control technique to suppress residual vibration of a dynamic system, and a testbed to verify its logics is needed for comparison purpose of input shaping control performance. In this paper, we developed a benchmark testbed for input shaping control, which is reliable, compact, easy to use, user-expandable and cost-effective. A mathematical model including saturation and time delay of the plant is obtained for simulation purpose. The validity of the developed system is demonstrated by experimenting actual input shaping logics. |
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Backstepping control integrated with model predictive control for selective catalytic reduction system of diesel vehicle |
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Yeonsoo Kim(Seoul National University, Korea), Changho Jung, Chang Hwan Kim, Yong Wha Kim(Hyundai Motor Company, Korea), Jong Min Lee(Seoul National University, Korea) |
| This study proposes backstepping control integrated with model predictive control to determine the amount of urea dosing. First, we prove that the subsystem of SCR is input-to-state stable with respect to the disturbances regardless of the value of the coverage fraction. Second, the desired coverage fraction of the catalyst is determined by solving the finite-horizon optimal control problem with the information of measurable disturbances. The backstepping control approach is then applied to determine the value of the manipulated input to achieve the desired coverage fraction. |
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