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Geometric Mechanics Based Nonlinear Model Predictive Spacecraft Attitude control with Reaction Wheels

JOURNAL OF GUIDANCE control AND DYNAMICS 2017年第2期40卷 309-319页

作者： Lee, Dae Young Gupta, Rohit Kalabic, Uros V. Di Cairano, Stefano Bloch, Anthony M. Cutler, James W. Kolmanovsky, Ilya V. Univ Texas Austin Ctr Space Res Austin TX 78759 USA Univ Michigan Dept Aerosp Engn Ann Arbor MI 48109 USA Mitsubishi Elect Res Labs Cambridge MA 02139 USA Univ Michigan Dept Math Ann Arbor MI 48109 USA Univ Michigan Dept Aeronaut & Astronaut Ann Arbor MI 48109 USA Univ Michigan Dept Aerosp Engn Ann Arbor MI 48109 USA

This paper develops a nonlinear model predictive controller for constrained attitude maneuvering of a fully actuated spacecraft with reaction wheels. In the proposed control algorithm, a Lie group variational integrator is used as a predictive model. The nonlinear model predictive control problem is formulated in the form of a discrete-time optimal control problem over each prediction horizon, and a numerical solver is used to solve the necessary conditions for optimality for this discrete-time optimal control problem. The numerical solver uses the indirect single shooting method. The control constraints and exclusion zone constraints are handled using the exterior penalty function approach. Simulation results are presented and compared with the case of a fully actuated spacecraft without reaction wheels. The nonlinear model predictive controller is shown to provide a large domain of attraction.

关键词： Spacecraft Attitude Model Predictive control Time Optimal control control algorithm Small Satellites Attitude Dynamics Lagrange Multipliers Attitude Determination and control System Sequential Quadratic Programming Photodiodes

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A hybrid seismic response control to improve performance of a two-span bridge

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STRUCTURAL ENGINEERING AND MECHANICS 2017年第5期61卷 675-684页

作者： Heo, Gwanghee Kim, Chunggil Jeon, Seunggon Lee, Chinok Jeon, Joonryong Konyang Univ Dept Civil Engn 121 Daehak Ro Nonan 32992 Chungcheongnam South Korea Chungnam Natl Univ Dept Civil Engn 99 Daehak Ro Daejeon 34134 South Korea

In this paper, a hybrid seismic response control (HSRC) system was developed to control bridge behavior caused by the seismic load. It was aimed at optimum vibration control, composed of a rubber bearing of passive type and MR-damper of semi-active type. Its mathematical modeling was driven and applied to a bridge model so as to prove its validity. The bridge model was built for the experiment, a two-span bridge of 8.3 meters in length with the HSRC system put up on it. Then, inflicting the EI Centro seismic load on it, shaking table tests were carried out to confirm the system's validity. The experiments were conducted under the basic structure state (without an MR-damper applied) first, and then under the state with an MRdamper applied. It was also done under the basic structure state with a reinforced rubber bearing applied, then the passive on/off state of the HSRC system, and finally the semi-active state where the control algorithm was applied to the system. From the experiments, it was observed that pounding rather increased when the MR-damper alone was applied, and also that the application of the HSRC system effectively prevented it from occurring. That is, the experiments showed that the system successfully mitigated structural behavior by 70% against the basic structure state, and, further, when control algorithm is applied for the operation of the MR-damper, relative displacement was found to be effectively mitigated by 80%. As a result, the HSRC system was proven to be effective in mitigating responses of the two-span bridge under seismic load.

关键词： hybrid seismic response control system rubber bearing MR-damper shaking table test control algorithm

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Lighting and cooling energy assessment of multi-purpose control strategies for external movable shading devices by using shaded fraction

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ENERGY AND BUILDINGS 2017年 150卷 328-338页

作者： Choi, Su-Ji Lee, Dong-Seok Jo, Jae-Hun Inha Univ Dept Architectural Engn Incheon 22212 South Korea

External movable shading devices are mainly used to improve the thermal and lighting environment of an interior space by preventing overheating during the cooling season as well as by preventing glare. An external movable shading device can be controlled using various methods, where parameters related to the lighting environment, such as daylighting and glare, are commonly adopted as major variables associated with the control of the shading device. In this paper, an algorithm is provided with which an external movable shading device can be operated in any one of three control modes as selected according to the operation purpose preferred by the occupant. The algorithm can be applied to external movable shading devices of various shapes. The shaded fraction is adopted as a major control element, and the control purpose of the external shading device is configured to include energy conservation, illuminance satisfaction, and glare protection. The algorithm includes an hourly evaluation procedure for obtaining the range of allowable shading device movement that satisfies each of the three operation purposes. Real-scale mockup tests for the three control modes were conducted during different time periods in summer to verify the performance of the control strategies. The test results regarding the energy and environment performance for each control mode show that the control algorithm can be selected to provide satisfactory compromises between energy and visual comfort factors. The result of this study can provide users with options for controlling movable shading devices on a building according to their preferred operation purposes. (C) 2017 Elsevier B.V. All rights reserved.

关键词： External movable shading device control algorithm Shaded fraction Glare Illuminance Energy

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control algorithm for a Doubly Fed Induction Generator in Medium Voltage Wind Power System under Fault Ride Through and Unbalanced Grid Conditions

Control Algorithm for a Doubly Fed Induction Generator in Me...

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IEEE Energy Conversion Congress and Exposition (ECCE)

作者： Suh, Yongsug Park, Yonggyun Go, Yuran Chonbuk Natl Univ Dept Elec Eng 664-14 Duckjin Dong Jeonju 556756 South Korea ILJIN Electric Co Ltd Youngstown OH 44501 USA

ISBN: (纸本)9781467308014

This paper investigates control algorithms for a doubly fed induction generator with a back-to-back three-level neutral-point clamped voltage source converter in medium voltage wind power system under unbalanced grid conditions. Three different control algorithms to compensate for unbalanced conditions have been investigated with respect to four performance factors;fault ride-through capability, instantaneous active power pulsation, harmonic distortions and torque pulsation. The control algorithm having zero amplitude of torque ripple shows the most cost-effective performance concerning torque pulsation. The least active power pulsation is produced by control algorithm that nullifies the oscillating component of the instantaneous stator active and reactive power. Combination of these two control algorithms depending on the operating requirements and depth of grid unbalance presents most optimized performance factors under the generalized unbalanced operating conditions leading to high performance DFIG wind turbine system.

关键词： control algorithm Induction Generator Unbalanced Grid Conditions Computer algorithms double-fed induction generator torque ripple Medium pressures wind power system Performance Factors Induction generators ride-through operational requirement grids voltage source converter Grid

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control strategy for mitigation of pulsed heat load transferred to ITER cryoplant from magnets

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FUSION ENGINEERING AND DESIGN 2017年第Oct.期121卷 1-6页

作者： Alekseev, A. Arslanova, D. Belyakov, V. Bessette, D. Gornikel, I. Kalinin, V. Kaparkova, M. Mitchell, N. Serio, L. Shatil, N. Sytchevsky, S. Vasiliev, V. JSC NIIEFA 3 Doroga Metallostroy St Petersburg 196641 Russia ITER Org Route Vinon Sur Verdon F-13115 St Paul Les Durance France ALPHYSICA GmbH Unterreut 6 D-76135 Karlsruhe Germany CERN CH-1211 Geneva 23 Switzerland St Petersburg State Univ St Petersburg Russia

Active mitigation of pulsed heat load is foreseen for the ITER superconducting magnets during cyclic plasma scenarios to ensure stable operation of the cryoplant. The paper addresses a promising feedback control to smooth heat pulses in the primary cryogenic circuits of the ITER magnets. A feedback control signal is proposed that can be derived from direct measurements of helium parameters in a low pressure return cryoline to the cryoplant. Configurations with two or more LHe baths were investigated at the Auxiliary Cold Box (ACB) level. Efficiency of the proposed control approach was evaluated in thermohydraulic simulations. A possibility to control several cryogenic loops using a common regulator is demonstrated. (C) 2017 Elsevier B.V. All rights reserved.

关键词： Fusion reactor Cryogenic circuit Cryoplant Heat load mitigation Thermal-hydraulic analysis control algorithm

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Finite-Time Fault-Tolerant Spacecraft Attitude control with Torque Saturation

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JOURNAL OF GUIDANCE control AND DYNAMICS 2017年第10期40卷 2524-2537页

作者： Hu, Qinglei Tan, Xiao Akella, Maruthi R. Beihang Univ Sch Automat Sci & Elect Engn Beijing 100191 Peoples R China Univ Texas Austin Dept Aerosp Engn & Engn Mech Engn Austin TX 78712 USA

A smooth attitude-stabilizing controller is proposed for rigid spacecraft actuated by thrusters that achieves finite-time stability in the presence of external disturbance, input saturation, and inertia uncertainty. More specifically, a novel time-varying fast terminal sliding-mode surface is first developed in conjunction with a judiciously designed control signal that rigorously obeys a known maximum-torque constraint. The controller can be viewed as a continuous analog to a variable structure approach, with the smoothness of the control permitted to vary with time according to a set of user-defined parameters. The second major contribution is that the control algorithm is extended to accommodate actuator faults while making use of the remaining active actuating capabilities. A Lyapunov-based analysis of the proposed formulation is provided, and finite-time stability of the closed-loop system is guaranteed. Numerical simulation studies are presented to help illustrate the desirable properties of the controller whenever certain design parameters are selected appropriately, and guidelines for selecting those parameters are provided in depth.

关键词： Spacecraft Attitude Model Reference Adaptive control Actuators Numerical Simulation control algorithm Rigid Spacecraft Attitude control System Fault Detection and Diagnosis Mathematical Models Spacecraft control

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A new filter-based pseudo-negative-stiffness control for base-isolated buildings

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STRUCTURAL control & HEALTH MONITORING 2017年第5期24卷 pn/a-N.PAG页

作者： Gong, Wei Xiong, Shishu Huazhong Univ Sci & Technol Sch Civil Engn & Mech Wuhan 430074 Hubei Peoples R China

A filter-based pseudo-negative-stiffness (FPNS) control is proposed for seismic control of base-isolated structures. The control algorithm is designed to produce a negative stiffness friction damping force with a gradual change at velocity switches, so that it is potential to prevent structures from experiencing significant jerks especially under earthquakes rich of high-frequency components. The control algorithm requires information only on device's displacement. The effect of the control parameters on structural performance is studied and the optimal combination of control parameters is obtained with the consideration of control efficiency and the economy of control force. The superior performance of an active control system employing the FPNS control algorithm over that employing the conventional PNS control algorithm is verified. A semi-active control design, MC-FPNS, is developed to produce the control force of the FPNS control algorithm by MR dampers. The effectiveness and robustness of the MC-FPNS control system are investigated through numerical analysis of the base-isolated benchmark problem under earthquakes scaled to different intensity levels. The proposed MC-FPNS control system is shown to be effective to not only prevent the isolator from failure but also improve the isolation functionality for a variety of earthquakes with different frequency contents and intensity levels. Moreover, the MC-FPNS control system is capable of suppressing transference of high-frequency components of ground motions to the superstructure. Copyright (c) 2016 John Wiley & Sons, Ltd.

关键词： pseudo-negative stiffness control control algorithm semi-active control benchmark base-isolated building MR damper

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Research on the automatically trajectory control of a spherical isolation plug in subsea pipeline

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OCEAN ENGINEERING 2017年 141卷 101-107页

作者： Zhu, Xiaoxiao Wang, Hao Li, Fengqin Quan, Yi Wang, Wenming Zhang, Shimin China Univ Petr Coll Mech & Transportat Engn Beijing 102249 Peoples R China

The rapid growth demanding for oil and gas resources has gradually driven the fossil energy exploitation from the land to the ocean. Technology shifts from manually operated oil fields to the remotely operated oil fields is necessary, and robotic assistance to human cognition is essential. Hot tapping and line stop techniques, as a great method for the replacement of the risky pipelines without disrupting the service to customers, demands for the automation to improve the efficiency and reliability. In this paper, automatically trajectory control of a spherical isolation plug in subsea pipeline was investigated. Mathematical model for the spherical plug head insertion was presented, and two control algorithms for the automatically insertion of the plug were proposed, named the rotation angle based control algorithm and the vertical displacement based control algorithm. Simulation was conducted and the results indicate that the vertical displacement based control algorithm owes better performance than the rotation angle based control algorithm. The accuracy and efficiency of the vertical displacement based control algorithm was then experimentally researched. The results in this paper can provide references for the automatically trajectory control of an isolation plug, as well as improve the accuracy and reliability of offshore hot tapping.

关键词： Subsea pipeline maintenance Spherical isolation plug Insertion trajectory control algorithm Geometrical modeling

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control of Asteroid-Hovering Spacecraft with Disturbance Rejection Using Position-Only Measurements

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JOURNAL OF GUIDANCE control AND DYNAMICS 2017年第10期40卷 2401-2416页

作者： Gui, Haichao de Ruiter, Anton H. J. Ryerson Univ Dept Aerosp Engn 350 Victoria St Toronto ON M5B 2K3 Canada

This paper addresses the control of spacecraft hovering about uniformly rotating asteroids using only position measurements. The highly uncertain dynamical environments and the absence of velocity feedback make it a challenging issue. To overcome the difficulties, an extended state observer is designed to estimate the spacecraft velocity and uncertain perturbations simultaneously. It ensures ultimately bounded estimation errors, irrespective of the control law applied. A velocity-free hovering controller is then obtained by driving a full-state feedback controller with estimates from the observer. The observer and controller design accounts for both measurement errors and unknown perturbations, and a Lyapunov analysis shows that the resultant control scheme globally stabilizes the spacecraft trajectory to the vicinity of the desired hovering state. Furthermore, autonomous hovering operations, implemented by either continuous or on-off thrusters, in both the body-fixed frame and the inertial frame are simulated with sensor noise and multiple unknown disturbances to demonstrate the effectiveness of the proposed methods.

关键词： Spacecrafts Asteroids Active Disturbance Rejection control Full State Feedback Spacecraft Trajectories Sensors Propellant Solar Radiation control algorithm Numerical Simulation

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Analysis of Compressor control Structures and algorithms for Compressor Drives for Automobile Gas Filling Compressor Stations

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Procedia Computer Science 2018年 145卷 652-655页

作者： Andrew A. Evstifeev Margarita A. Zaeva National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) Kashirskoe shosse 31 Moscow 115409 Russia LLC Gazprom VNIIGAZ Leninsky district Razvilkovsky village Razvilka 5537 Proyektiruyemyy Proyezd 15-1 Moscow region 142717 Russia

Prototypes of structures and control algorithms for compressor drives for automobile gas filling compressor stations are considered. The stations have switching facilities with semiconductor switches on fully managed switches. Examples of realization and technical solutions for controlling compressor drives of different designs, performance and power are given.

关键词： control algorithm automobile gas filling compressor station compressor

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