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Nonlinear adaptive control for slewing flexible active structures

JOURNAL OF GUIDANCE control AND DYNAMICS 2004年第1期27卷 142-145页

作者： Wilson, DG Starr, GP Parker, GG Robinett, RD Sandia Natl Labs Dept 15211 Albuquerque NM 87185 USA Univ New Mexico Dept Mech Engn Albuquerque NM 87131 USA Michigan Technol Univ Dept Mech Engn Houghton MI 49931 USA Sandia Natl Labs Dept 6200 Albuquerque NM 87185 USA

The development of lightweight flexible structures that include both advanced control and active material will impact several space application areas. One way to reduce vibration is the combination of advanced control methods such as nonlinear adaptive control plus active structure technology. Active structures with both sensors and actuators, strategically placed along the structure, can suppress vibrations and enhance slewing performance. Active vibration suppression is accomplished with a graphite/epoxy composite structure that includes embedded strain sensors and actuators.

关键词： Linear Quadratic Regulator Flexible Structures Flexible Manipulators Flight control Design Active Vibration Suppression Stiffness Matrices Vibration Suppression control algorithm Flying Qualities Strain Gauge

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Covariance control for sensor management in cluttered tracking environments

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JOURNAL OF GUIDANCE control AND DYNAMICS 2004年第3期27卷 493-496页

作者： Kalandros, M No, LY Univ Colorado Dept Elect & Comp Engn Boulder CO 80309 USA

Sensor management schemes have recently been proposed to reduce the tracking demands on multisensor systems while minimizing the loss of tracking performance by selecting only enough sensing resources to maintain a desired covariance level for each target. However, covariance control algorithms to date have not addressed the presence of clutter measurements and the need for data association in those cases. This note presents a method of reducing the effects of probabilistic data association on covariance control algorithms through the addition of a scalar loss of information parameter. Whereas single-sensor management systems have been designed for the probabilistic data association filter (PDAF), including one that uses the loss of information parameter to approximate the covariance calculation, no sensor managers to date haw been designed around the multisensor extension of the PDAF. Monte Carlo simulations show that, without this parameter, the co variance control system is unable to maintain the desired covariance resulting in a much larger actual covariance level. Use of the loss of information parameter generally restores system performance.

关键词： Sensors Solar Electric Propulsion Interplanetary Mission Monte Carlo Simulation control algorithm Probability Distribution Track algorithm Propulsion System Kalman Filter Propellant

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Exact solutions for instability control of piezolaminated imperfect struts

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AIAA JOURNAL 2004年第4期42卷 857-859页

作者： Mukherjee, A Chaudhuri, AS Indian Inst Technol Dept Civil Engn Bombay 400076 Maharashtra India

The exact solutions for active instability control of strut is demonstratedin this Note by using displacement and velocity feedback methods. A comparative study of thecombined displacement and velocity feedback method is shown with respect to energy *** feedback increases the effective stiffness of the structure and velocity feedbackaugments its damping. Hence, displacement feedback is necessary to reduce the amplitude of vibrationand velocity feedback is necessary to attenuate it more rapidly. A judicious selection ofdisplacement and velocity feedback is required for optimum energy consumption in control.

关键词： Energy Consumption Piezoelectric Materials Structural Vibration Dielectric Constant Feedback control System Flexural Rigidity control algorithm Structural System Active control Critical Loading

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Global control Simulation of Electric Vehicle Based on Finite State Machine Theory

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Journal of Beijing Institute of Technology 2004年第S1期13卷 68-72页

作者：邹渊孙逢春何洪文 School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing100081China

Finite state machine theory (FSM) is introduced and applied to global control of electric vehicle. Theoretical adaptation for application of FSM in control of electric vehicle is analyzed. Global control logic for parts of electric vehicle is analyzed and built based on FSM. Using Matlab/Simulink, BJD6100-HEV global control algorithm is modeled and prove validity by simulation.

关键词： electric vehicle: finite state machine control algorithm

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Development of counterpulsation algorithm for a moving-actuator type pulsatile LVAD

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INTERNATIONAL JOURNAL OF ARTIFICIAL ORGANS 2004年第10期27卷 882-890页

作者： Nam, KW Chung, J Choi, SW Kim, WE Sun, K Min, BG Seoul Natl Univ Coll Med Dept Biomed Engn Seoul 110744 South Korea Seoul Natl Univ Interdisciplinary Program Med & Biol Engn Major Seoul South Korea Seoul Natl Univ Med Res Ctr Inst Med & Biol Engn Seoul South Korea

A pulsatile left ventricular assist device (LVAD) was used to support the aortic blood pumping function of an injured left ventricle, and as a result helped its recovery. It is important to observe a left ventricle's pumping status and to adjust the operating status of a LVAD to reduce the left ventricle's pumping load and thus to enhance its recovery To observe the left ventricle's pumping status, an electrocardiogram (ECG) signal is generally used because it is a result of the natural heart's blood pumping function. In this paper, we describe the development of an ECG based counterpulsation control algorithm that prevents simultaneous aortic blood co-pumping by a left ventricle and a moving-actuator type pulsatile LVAD and as a result, reduces the natural heart's pumping load. In addition, to verify the algorithm's applicability for LVAD control we designed three ECG based automatic pump control algorithms that use a developed counterpulsation control algorithm. These algorithms control the operating status of a LVAD automatically and, at the same time, maintain a counterpulsing status. The results of in vitro experiments show that the counterpulsing effect between a left ventricle and a LVAD was successfully produced and that the newly designed automatic pump control algorithms met their own control purposes with a counterpulsing effect.

关键词： counterpulsation control left ventricular assist device control algorithm electrocardiogram moving-actuator type ventricular assist device

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Trajectory shaping in linear-quadratic pursuit-evasion games

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JOURNAL OF GUIDANCE control AND DYNAMICS 2004年第6期27卷 1102-1105页

作者： Ben-Asher, JZ Levinson, S Technion Israel Inst Technol Fac Aerosp Engn IL-32000 Haifa Israel

The effect of the trajectory-shaping term on such disturbance attenuation is presented and analyzed. The model used for the analysis assumes planar geometry, first-order pursuer, and ideal evader dynamics. The analysis leads to a differential Riccati equation that needs to be solved. A simple technique for facilitating the solution is proposed. The Note is organized as follows: In the next section the standard two-dimensional problem geometry and the mathematical modeling will be reviewed. The problem formulation and analysis by the LQDG theory will be presented in Sec. III. Section IV presents some numerical results including a comparison between the LQDG and the hard-bounded game results. Section V summarizes the paper.

关键词： Riccati Equations Guidance Laws Earth Algebraic Riccati Equation State Space Representation Mathematical Models Low Thrust Propulsion control algorithm Solar Radiation Heading Angle

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Synthesis of optimal control and flight testing of an autonomous circular parachute

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JOURNAL OF GUIDANCE control AND DYNAMICS 2004年第1期27卷 29-40页

作者： Yakimenko, OA Dobrokhodov, VN Kaminer, II Dellicker, SH USN Postgrad Sch Dept Aeronaut & Astronaut Monterey CA 93943 USA US Army Yuma Proving Ground Yuma AZ 85365 USA

Development of guidance and control algorithms for autonomous solid circular parachutes is addressed. This effort is a part of the Affordable Guided Airdrop System that integrates a low-cost guidance and control system into fielded cargo air delivery systems. First, the underlying Affordable Guided Airdrop System concept, architecture, and components are described. Then a synthesis of a classical optimal control based on Pontrjagin's maximum principle is suggested. Then the development of a practical control algorithm is detailed. Simulation and flight-test results of the final Affordable Guided Airdrop System demonstration are also presented.

关键词： Time Optimal control Flight Testing Affordable Guided Airdrop System control algorithm control Systems Pneumatic Muscle Actuators Yaw Hysteresis GNC Systems Flight control algorithms

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Integrated 3-D Animation system for decentralized controlled space telescope test-bed

Integrated 3-D Animation system for decentralized controlled...

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International Conference on Modeling, Simulation and Visualization Methods/International Conference on algorithmic Mathematics and Computer Sciences

作者： Boussalis, H Liu, C Dong, J Rad, K Alpas, C Chen, YL Komandyan, Y Ren, X Sun, W Calif State Univ Los Angeles Los Angeles CA 90032 USA

ISBN: (纸本)1932415343

This paper presents the design and implementation of an integrated 3-D animation system for space segmented telescope test-bed. Sponsored by National Science Foundation (NSF), the objective of the animation system is to demonstrate various real-time control algorithms developed in Structures Pointing And control Engineering (SPACE) Laboratory, and to provide a research tool for exploring new control algorithms. The development of the 3-D animation system involves a variety of techno! logies, such as real-time decentralized control, animation technology based on computational geometry, and user-friendly graphic user interface design methodology, etc. In order to integrate heterogeneous technologies together seamlessly, a highly modularized methodology is employed, based on which the 3-D animation system is decomposed into four autonomous modules. Each module encapsulates a different technology. To enable efficient interaction between different modules, inter-module communication is established by Common Object Request Broker Architecture (CORBA). This system integration method provides an open and flexible platform for software development, and significantly reduces the cost of implementation and maintenance.

关键词： segmented telescope 3-D Animation Graphic User Interface control algorithm CORBA

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Some new problems of automatic control of extrusion process

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POLIMERY 2004年第3期49卷 195-201页

作者： Sikora, JW Broel-Plater, B Politech Lubelska Katedra Proc Polimerowych PL-20618 Lublin Poland Tech Univ Szczecin Inst Automat Przemysloej PL-71126 Szczecin Poland

control of an extrusion process in the extruder with a passive grooved feed section bases on either the screw velocity change (Fig. 1) or the changes of temperatures of particular heating zones of plastifying system and extruder head. This work concerns the better use of possibility of control offered by the extruder with active grooved feed section. Its constructional features can fit the processes carrying out in it (Fig. 3). An idea of an extruder, allowing changing the direction of the grooves' torsion during the extrusion as well as to change continuously an angle of the grooves' torsion and their cross-section shape, was elaborated and then the model and a prototype were constructed. On this basis the conditions allowing selecting the optimal couple of screw velocity and an angle of the grooves' torsion leading to the optimal work of an extruder (Figs. 5 and 6) were presented. These activities and application of self-learning mechanisms, using the artificial intelligence methods, allow constructing the system of automatic control of an extrusion process, able to improve its own efficiency gradually with extruder use. A number of limitations of such optimization were pointed. out.

关键词： extrusion extruder active grooved feed section automatic control control algorithm extrusion work optimization

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Simple structure for a high-performance three-dimensional tracking filter

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JOURNAL OF GUIDANCE control AND DYNAMICS 2004年第3期27卷 491-493页

作者： Weiss, H Hexner, G RAFAEL Armament Dev Author Ltd Dept 39 IL-31021 Haifa Israel

The structure of a three-dimensional tracking filter in a rotating sensor frame was discussed. The three-dimensional estimator consisted of three independent filters whose state included position, velocity and acceleration along the tree axes in the rotating frame sensor frame. The line-of-sight models for the target acceleration were found to be identical in all three axes and independent. Analysis shows that filter structure remained unchanged during the replacement of basic exponetially correlated acceleration model by more complicated models.

关键词： Track algorithm control algorithm Kalman Filter Cartesian Coordinate System Monte Carlo Simulation Poisson Distribution Interceptor Missile Kinematics Equation White Noise

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