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检索条件"任意字段=Smart Structures and Materials 2000 - Mathematics and Control in Smart Structures"

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Development of a recursive ZAP controller with specific applications in flexible space structures

Development of a recursive ZAP controller with specific appl...

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smart structures and materials 1994: mathematics and control in smart structures

作者： Jakubowski, Amy M. Helferty, John J. Bayard, David S. Department of Electrical Engineering Temple University United States Jet Propulsion Laboratory California Institute of Technology United States

When continuous-time systems are discretized in the digital controller design process, it is often the case that unstable discrete-time zeros (i.e., zeros outside the unit circle in the Z-plane) result regardless of whether or not there are unstable zeros in the original continuous-time plant. Such a system is recognized as being nonminimum phase. Unfortunately, many design techniques in adaptive control are dependent upon pole-zero cancellations and stable plant invertibility and, therefore, cannot be utilized when the plant is nonminimum phase. In this research, a matrix parameter recursive least squares (RLS) adaptation law is developed for the zero annihilator periodic (ZAP) controller first introduced by Bayard[7] and later extended by Jakubowski[8]. This direct adaptive control scheme allows for the construction of an optimal set of matrix controller gains that will place the transmission zeros of the system at the origin, alleviating the nonminimum phase condition, and force the system output to track a desired reference signal. This adaptive ZAP control law has specific applications in nonminimum phase flexible space structures such as the ASTREX facility developed by researchers at Edwards Air Force Base [16]. This flexible structure is a space-based laser that requires the control of three PZT struts that control the traverse bending in two orthogonal planes and one axial direction of a payload. Simulations are presented that demonstrate the performance of the adaptive ZAP controller on a 12-state, 2-input, 2-output partial model of one of the ASTREX struts, where the model of the particular strut exhibits nonminimum phase characteristics. © 1994 SPIE.

关键词： controllers

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An experiment in feedforward control for the reduction of sound transmission through an elastic plate backed by a rigid rectangular cavity

An experiment in feedforward control for the reduction of so...

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smart structures and materials 1994: mathematics and control in smart structures

作者： Ellis, Graham K. Koshigoe, Shozo Aerospace Corporation P.O. Box 92957 M4/972 Los AngelesCA90009-2957 United States

The payload compartment of space launch vehicles is an acoustically severe environment with sound pressure levels that often exceed 130 dB. Many of the design constraints for satellites are driven by the launch loads and any reduction in these loads would allow lighter spacecraft and significant cost savings because of reduced launch weight and testing requirements. In order to determine the levels of sound attenuation possible in such an application, a simple experimental apparatus consisting of a flexible plate backed by a rigid rectangular cavity has been built to mimic the behavior of a launch vehicle payload compartment. An external speaker is used to simulate the pressure loading caused by vehicle exhaust and turbulent flow around the launch vehicle. This paper provides a comparison of the harmonic disturbance attenuation capability and transient/convergence performance of a fixed analog feedforward and a filtered-x LMS adaptive feedforward controller for the cavity backed plate problem using piezoelectric ceramic (PZT) actuators on the flexible plate and polyvinylidene fluoride (PVDF) pressure and plate vibration sensors. controllers are developed for the first plate controlled mode and the first cavity controlled mode. © 1994 SPIE.

关键词： Vibrations (mechanical)

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Modeling and robust control of smart structures

Modeling and robust control of smart structures

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smart structures and materials 1993: mathematics in smart structures

作者： Tebbe, Chris D. Schroeder, Tim G. Butler, Robert K. Rao, Vittal S. Koval, Leslie R. et.al. Univ. of Missouri/Rolla Rolla MO USA

ISBN: (纸本)0819411523

The design and implementation of control strategies for large, flexible smart structures presents challenging problems. One of the difficulties arises in the approximation of high-order finite element models with low order models. Another difficulty in controller design arises from the presence of unmodeled dynamics and incorrect knowledge of the structural parameters. In this paper, the balance-truncation reduced-order models are employed in deriving lower-order models for complex smart structures. These methods do not introduce any spill-over problems in the closed-loop response of the system. The simplified analytical models are compared with models developed by structural identification techniques based on vibration test data. To minimize the effects of uncertainties on the closed-loop system performance of smart structures, robust control methodologies have been employed in the design of controllers. The reduced order models are employed in the design of robust controllers. To demonstrate the capabilities of shape-memory-alloy actuators, we have designed and fabricated a three-mass test article with multiple shape-memory-alloy (NiTiNOL) actuators. Generally, the non-collocation of actuators and sensors presents difficulties in the design of controllers. controllers for a test article with non-collocated sensors and actuators are designed, implemented and tests. The closed-loop system response of the test article with two actuators and sensors has been experimentally determined and presented in the paper.

关键词： Shape memory effect

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APPLICATION OF DESIGN OPTIMIZATION TECHNIQUES FOR VIBRATION control OF structures USING PIEZOELECTRIC DEVICES

APPLICATION OF DESIGN OPTIMIZATION TECHNIQUES FOR VIBRATION ...

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1993 smart structures AND materials CONF : smart structures AND INTELLIGENT SYSTEMS

作者： CHATTOPADHYAY, A SEELEY, CE Arizona State Univ. (United States)

ISBN: (纸本)0819411507

Active vibration control of structures using piezoelectric materials is a new approach for damping unwanted vibrations in structures lacking sufficient stiffness or passive damping. The finite elements method is used to model active damping elements which are piezoelectric actuators bonded to a box beam. Efficient implementation of these actuators requires that their optimal locations on the structure be determined and that the structure be designed to best utilize the properties of the piezoelectrics. A formal optimization procedure has been developed to address both of these issues. Multiobjective optimization techniques are used to minimize multiple and conflicting design objectives such as mass and energy dissipated by the piezoelectric actuators.

关键词： Actuators Intelligence systems smart structures Structural design Vibration control control systems Finite element methods Ferroelectric materials Optimization (mathematics) Sensors

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RECENT controlLABILITY RESULTS FOR THE WAVE-EQUATION IN DOMAINS WITH SMALL HOLES

RECENT CONTROLLABILITY RESULTS FOR THE WAVE-EQUATION IN DOMA...

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1993 NORTH AMERICAN CONF ON smart structures AND materials

作者： DONATO, P Univ. di Salerno (France)

ISBN: (纸本)0819411523

An important problem in the applications is the controllability for perturbed systems. A special kind of perturbed systems, depending on a small parameter (epsilon) is the wave equation when the coefficients are rapidly oscillating or when posed in periodically perforated domains. Then a limit system (in the homogenization theory sense) can be defined. We present here a review of some recent results for exact and approximate controllability in these situations.

关键词： control systems Homogenization mathematics smart structures Wave plates Distributed computing Fourier transforms Mathematical modeling Statistical analysis

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ELECTROMECHANICAL SURFACE DAMPING USING CONSTRAINED LAYER AND SHUNTED PIEZOELECTRIC

ELECTROMECHANICAL SURFACE DAMPING USING CONSTRAINED LAYER AN...

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1993 NORTH AMERICAN CONF ON smart structures AND materials

作者： GHONEIM, H Rochester Institute of Technology (United States)

ISBN: (纸本)0819411523

An electromechanical surface damping (EMSD) technique is proposed. The technique is a combination of the constrained layer damping and the shunted piezoelectric methods, where the viscoelastic layer attached to the surface of the vibrating substructure is constrained by a shunted piezoelectric ceramic element. A mathematical model of the dynamic behavior of the coupled piezoelectric/constrained layer/substructure (EMSD element) is developed, implemented into a finite element algorithm, and used to investigate the effect of some of the system parameters on the dynamic characteristics (the first three natural frequencies and modal loss factors) of a generic cantilever beam. The effect of the following system parameters is considered: storage modulus ratios, material loss factors, thickness ratios, and the axial location of the EMSD element. The algorithm is also used to demonstrate the effectiveness of the proposed EMSD technique in controlling the peak vibration amplitudes at the first two natural frequencies of the cantilever beam.

关键词： Algorithm development mathematics smart structures Algorithms Ceramics Mathematical modeling Composites Electroluminescence Environmental sensing Vibration control

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smart structures and materials 1993: mathematics in smart structures

Smart Structures and Materials 1993: Mathematics in Smart St...

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smart structures and materials 1993: mathematics in smart structures

The proceedings contains 34 papers. Following topics are discussed: computational methods;control;materials modeling;and continuum modeling.

ISBN: (纸本)0819411523

The proceedings contains 34 papers. Following topics are discussed: computational methods;control;materials modeling;and continuum modeling.

关键词： Shape memory effect

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Covariance active/passive control

Covariance active/passive control

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smart structures and materials 1993: mathematics in smart structures

作者： Skelton, Robert E. Lee, Yi-Bing Zhu, Guoming Purdue Univ. West Lafayette IN USA

An integrated means for active controller design and structure redesign is presented. The techniques of covariance control are used to parametrize all possible combinations of active controllers/structure redesign par... 详细信息

ISBN: (纸本)0819411523

关键词： control systems

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Fuzzy-sliding-mode control for vibration damping of flexible structures

Fuzzy-sliding-mode control for vibration damping of flexible...

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smart structures and materials 1993: mathematics in smart structures

作者： Meyer, John E. Burke, Shawn E. Hubbard Jr., James E. Charles Stark Draper Lab. Inc. Cambridge MA USA

ISBN: (纸本)0819411523

A control methodology integrating sliding mode control, distributed parameter systems theory, and fuzzy control is presented for the vibration damping of flexible structures. The method reduces the theoretically infinite-order system to a second-order representation, still capturing its vibratory nature in a series of decentralized input/output loops. A sliding controller is then designed with fuzzy control gain weighting to increase the performance of the system off the sliding surface. The results of computer simulations are presented including comparisons demonstrating superior damping performance to output velocity feedback.

关键词： Vibration control

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Identification and robust control of flexible structures using shape memory actuators

Identification and robust control of flexible structures usi...

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smart structures and materials 1993: mathematics in smart structures

作者： Lashlee, Robert W. Damle, Rajendra Rao, Vittal S. Kern, Frank J. Univ. of Missouri/Rolla Rolla MO USA

ISBN: (纸本)0819411523

The application of shape memory alloy materials as actuators and sensors in the active control of flexible structures has been extensively reported in the literature. The design of active controllers plays an important role in the overall development of smart structures for a given application. To design active controllers for flexible structures, a mathematical representation of the system is needed. The process of constructing a model to describe the vibration properties of a structure based on experimental test data is known as structural identification method. To account for any uncertainties in the structural models and to accomplish good closed loop system performance and noise suppression properties, we have developed robust control design methodologies for flexible structures. We have utilized the eigensystem realization algorithm (ERA) for system identification and linear quadratic Gaussian with loop transfer recovery (LQG/LTR) method for designing robust controllers for a simple cantilever beam test article. The shape memory alloy, NiTiNOL, is used as an actuator. The LQG/LTR method has been modified to accommodate the limited control force provided by the actuators. The closed loop performance of the cantilever beam is experimentally determined for various types of uncertainties. The properties of robust controllers are demonstrated.

关键词： Shape memory effect

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