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检索条件"任意字段=Conference on Mathematics and Control in Smart Structures"

共 142 条记录，以下是61-70 订阅

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Probabilistic characterization of the performance of actively controlled smart structures

Probabilistic characterization of the performance of activel...

引用

smart structures and Materials 1999 conference

作者： Akpan, UO Orisamolu, IR Martec Ltd Res & Emerging Technol Dept Halifax NS B3J 3J8 Canada

ISBN: (纸本)0819431419

smart materials and structural systems are increasingly attracting attention from the engineering community because of their importance in current and future high performance structural applications. As these new structural systems emerge, there is an important need to have capabilities that can be employed for assessing their performance with reference to the primary functional requirement of structural integrity and control robustness as well as reliability. Furthermore, it is desirable to establish adequate performance metrics (which account for inherent or environmental uncertainties) that can be used as a quantitative basis for the comparative evaluation of various design options or for assessing the state of such systems that are already in service. In this study, two measures that can be used for probabilistic characterization and assessment of the performance of actively controlled smart structures are developed. The framework is based on the use of the probabilistic finite element strategy for modelling the parent (host) structure as well as the piezoelectric materials that are employed for sensing and actuation in the assembled system. The uncertainties inherent in the parent structure and the piezoelectric materials are propagated through the probabilistic finite element model. This enables rational and realistic characterisation of the performance measures. The probabilistic models are based on the use of advanced reliability analysis algorithms which utilize fast probability integration algorithms that are robust and computationally more efficient than Monte Carlo simulation schemes. To facilitate efficient computation, an adaptive response surface methodology is employed for the approximation of the probabilistic finite element response quantities. Example problems are used to illustrate the robustness and usefulness of the proposed, methodology.

关键词： probabilistic characterization uncertainties finite elements smart structures active control

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control system design for structural systems under statistical parametric uncertainty

Control system design for structural systems under statistic...

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smart structures and Materials 1999 conference

作者： Huerta-Ochoa, R Johnson, SH Lehigh Univ Dept Mech Engn & Mech Bethlehem PA 18015 USA

ISBN: (纸本)0819431419

This paper presents a statistical approach to the controller design process for structural systems represented by uncertain models. The plant model uncertainty is here accounted for in terms of first- and second-order statistics of uncertain parameters. The basic idea is to make the closed-loop system stability as robust as possible to statistical variations of uncertain plant model parameters. First, an approximate expression for the root variance of an uncertain polynomial is derived as a function of second-order statistics of the polynomial coefficients. The expression is specialized to the case of an SISO closed-loop system characteristic polynomial, where the uncertainty is due to statistical variability of model parameters. Uncertainty cost functions intended to represent the uncertainty of the closed-loop pole locations are then constructed. By parameterizing the set of controllers that yield a desired characteristic polynomial, the uncertainty cost function minimization is converted into a constrained optimization problem. This scheme is illustrated with an SISO seismic control system previously studied in the literature. By comparing the predicted closed-loop pole variance to numerical results obtained from Monte Carlo simulations, it is concluded that the expression developed here provides an excellent approximation, with the advantage of being an analytical expression that is suitable for use in multi-objective optimization design algorithms.

关键词： structural control uncertain polynomials smart structures control uncertain models

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Modeling of sound transmitted, into a cavity through a composite plate using coupled FE/BE method and control of acoustic pressure using piezoelectric actuators

Modeling of sound transmitted, into a cavity through a compo...

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smart structures and Materials 1999 conference

作者： Shi, YC Mei, C Analyt Serv & Mat Inc Hampton VA 23666 USA

ISBN: (纸本)0819431419

A coupled finite element/boundary element method is developed for the fully coupled structural/acoustic/piezoelectric system. This approach uses the dual reciprocity boundary element method to describe time dependent acoustic field and the finite element to structures and piezoelectric materials. A time-domain formulation of the coupled method is obtained. Based on the coupled time domain formulation, a linear quadratic regulator and a feedforward controller are applied to reduce the acoustic pressure transmitted into a cavity through a composite plate using embedded piezoelectric actuators. The controls of interior acoustic fields due to excitations at different frequencies are investigated, transmission losses and deflection of the plates of the controlled and uncontrolled systems are presented.

关键词： finite element method boundary element method composites structural/acoustic interaction piezoelectric material actuators feedforward linear quadratic regulator

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Active suppression of plate vibration with piezoceramic actuators/sensors using multiple adaptive feedfoward with feedback loop control algorithm

Active suppression of plate vibration with piezoceramic actu...

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smart structures and Materials 1999 conference

作者： Kim, YS Kim, I Lee, C Moon, CY Kumoh Natl Univ Technol Sch Mech Engn Kumi 730701 Kyungbuk South Korea

ISBN: (纸本)0819431419

This paper presents a methodology to suppress the vibration of thin rectangular plate clamped all edges. Intelligent materials such as the piezoelectric ceramic are used as actuators and sensors. The experimental modeling technique, i.e., the state-space frequency domain identification, is introduced to model the complex shaped structures bonded with noncollocated actuators/sensors. This method is much free from the Multi-Input Multi-Output (MIMO) model order problem caused at the digital implementation and also reduces distortion of the signal. In control scheme, the adaptive feedforward with feedback control algorithm is adopted since it is robust for both the transient and persistent external disturbances. The adaptive feedforward control uses the well known Multiple filtered-x LMS(least mean square) algorithm. The MIMO error path dynamics is controlled by the feedback loop which is constructed by multivariable digital LQG(Linear Quadratic Gaussian) controller composed of the regulator and Kalman filter. Experiment results demonstrate the effective reduction of the vibration label and the robustness for both the transient and persistent external disturbances.

关键词： active control piezoelectric optimal control feedforward Kalman filter

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Optimal vibration control of adaptive-aircraft wings carrying externally mounted stores and exposed to blast loading

Optimal vibration control of adaptive-aircraft wings carryin...

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smart structures and Materials 1999 conference

作者： Na, S Librescu, L Korea Polytechn Univ Dept Automat Engn Keongki Do 429450 South Korea

ISBN: (纸本)0819431419

A study of optimal vibration control of aircraft wings carrying externally mounted stores and exposed to blast loading is presented. The wing structure is modelled as a thin-walled beam of closed cross-section contour, and a number of non-classical features such as transverse shear, secondary warping, and anisotropy of the constituent materials are included. The wing structure can carry underwing and/or tip stores. The control is achieved via the use of actuating and sensing-capabilities provided by piezoelectric devices which are bonded or embedded into the host structure. The cases of piezoactuators spread over the entire span of the structure, or in the form of a patch are considered, and issues related with the influence of patch location and size upon the vibration control efficiency of wings carrying external stores are discussed. Other issues related with the minimization of the required input power and of those generated by the inclusion/discard in the quadratic performance index of time-dependent external excitations are also addressed.

关键词： optimal control dynamic response aircraft wings external stores piezopatch piezoactuators

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Dynamic model reduction for control of molecular beam epitaxy

Dynamic model reduction for control of molecular beam epitax...

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smart structures and Materials 1999 conference

作者： Kan, D Univ Calif Los Angeles Dept Math Los Angeles CA 90024 USA

ISBN: (纸本)0819431419

One important component in the development of many smart structures and microdevices is the growth of thin firms. The control of the growth processes, therefore, is of interest. In the design of a control system for molecular beam epitaxy (MBE), it is important to have simple mathematical models that describe the different growth morphologies that a growing film may exhibit and incorporate atomic-scale information. Of the three types of models currently being considered (atomistic, continuum, and bulk), bulk models have the most interest to control. Still, due to the complexity of such models, however, a model reduction must be carried out to make real-time control possible. A model reduction routine based on a new version of the nonlinear Galerkin methods is proposed and explained for three different bulk models. A total reduction of one-third the number differential equations is obtained.

关键词： model reduction molecular beam epitaxy

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Active position control of a shape memory alloy wire actuated composite beam

Active position control of a shape memory alloy wire actuate...

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smart structures and Materials 1999 conference

作者： Song, GB Kelly, B Agrawal, BN Univ Akron Dept Mech Engn Akron OH 44325 USA

ISBN: (纸本)0819431419

This paper presents the design and experiment results of active position control of a shape memory alloy (SMA) wires actuated composite beam. The composite beam is honeycomb structured with shape memory alloy wires embedded in one of its phase sheet for active actuation. The potential applications of this experiment include thermo-distortion compensation for precession space structure, stern shape control for submarines, and flap shape control for aeronautical applications. Shape memory alloy wires are chosen as actuating elements due to their high recovery stress (maybe >700 MPa) and tolerance to high strain (up to 8%). However, shape memory alloy wires are inherently nonlinear and pose a challenge for control design. A robust controller is designed and implemented to active control the tip position of the composite beam. The experiment setup consists of the composite beam with embedded SMA wires, a programmable current/voltage amplifier to actuate the SMA wires, an infrared laser range sensor to detect the beam tip displacement, and a real-time data acquisition and control system. Experiments demonstrated the effectiveness of the robust control.

关键词： shape memory alloy position control robust control real-time control nonlinearity compensation composite beam SMA wire actuator

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Active vibration control using piezoelectric smart discs

Active vibration control using piezoelectric smart discs

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smart structures and Materials 1999 conference

作者： van Schothorst, G Philips Ctr Mfg Technol NL-5600 MD Eindhoven Netherlands

ISBN: (纸本)0819431419

In high-precision motion systems, like wafer stages and electron microscopes, mechanical vibrations are a major point of concern. Often, these vibrations have small amplitudes (micrometers) and relatively high frequency (> 50 Hz). The so-called smart Disc (a combined piezoelectric actuator and sensor) is a device that might be used to suppress these vibrations actively. The feasibility of the smart Disc concept is investigated, using an experimental set-up, consisting of a double mass-spring system, with two smart Discs. This system has two badly damped resonance modes, to be damped by the smart Disc(s), by means of feedback of the measured local interaction forces to the actuated displacements. The corresponding control problem, is to minimize the vibrations of the two masses, as a result of a disturbing force. With the experimental set-up, some aspects have been investigated. In the modelling phase, the system revealed high-frequent (3 kHz) resonance peaks, which appeared to originate from the smart Disc housings. These dynamics have been identified and taken into account in the control design. Because of these high-frequent dynamics near the Nyquist frequency, and the high gain at that frequency (which is inherent to the smart Disc concept) discrete time effects have been taken into account explicitly. Besides conventional active vibration control strategies, more sophisticated (MIMO H-infinity, discrete time) control design strategies have been applied successfully.

关键词： active vibration control piezoelectric actuators and sensors identification control design digital control

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Robust, compact and inexpensive analog controllers for cabin noise control

Robust, compact and inexpensive analog controllers for cabin...

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smart structures and Materials 1999 conference

作者： Chang, W Ramanathan, K Varadan, VV Varadan, VK Penn State Univ Engn Elect & Acoust Mat Res Ctr University Pk PA 16802 USA

ISBN: (纸本)0819431419

Active Noise control has been an area of research interest in the recent decades with the goal of providing reduced noise levels in automobile and aircraft enclosures. Although digital controllers are adaptable and efficient, they lack the simplicity of analog controllers due to the requirement of a computer, D/A and A/D boards. Analog controllers on the other hand can be designed to be compact using current IC technology and hence are relatively very cheap. The following paper studies the application of an analog robust controller to abate the noise radiated into a non-reverberant wooden enclosure by a clamped aluminum plate. Since only the odd-odd modes radiate efficiently, a SISO robust analog controller was designed and built inexpensively for a piezoelectric actuator and accelerometer sensor placed at the center of the plate. A reduction of 17dB is observed when the panel is excited at its fundamental frequency, the dominant radiating mode. When the plate is excited with narrowband noise (40-316Hz), the controller reduces the noise levels in the enclosure by 9dB. The experimental results agree well with the controller simulation carried out using MATLAB

关键词： cabin noise control robust control analog controller

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Reduced order modeling for low Reynolds number flow control

Reduced order modeling for low Reynolds number flow control

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smart structures and Materials 1999 conference

作者： Kurdila, AJ Carroll, B Nishida, T Sheplak, M Univ Florida Dept Aerosp Engn Mech & Engn Sci Gainesville FL 32611 USA

ISBN: (纸本)0819431419

This paper presents recent analytical and experimental research to modify and control low Reynolds number flows over prototypical airfoils associated with micro-air-vehicles. The simplified experimental test geometry consists of a meso-scale piezoceramic actuated flap that undergoes peak amplitude displacements of 40 microns. The flap actuator array is designed to modify separation and reattachment location on the airfoil. The location of the reattachment on the upper surface of the prototypical airfoil is measured by an array of MEM's shear stress Sensors located downstream. The focus of this paper is the discussion of the status and applicability of reduced order modeling techniques for the derivation of active feedback flow control strategies for the prototypical active airfoil. Frequently, reduced order models are derived from a library of component fluid. modes which serve as the basis for a low dimensional approximation of the nonlinear Navier Stokes equations. The methdology discussed in this paper differs markedly from these approaches. We derive a technique employing multiresolution and wavelet approximations of nonlinear Volterra series that represent the input-output dynamics of the system. The accuracy of the resultant low-dimensional input-ouput models is validated on a benchmark nonlinear aeroelastic testbed.

关键词： Sensors Microelectromechanical systems Complex systems Wavelets Actuators Performance modeling Systems modeling control systems Feedback control Ferroelectric materials

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