Piezoelectric modal sensors and actuators achieving critical active damping on a cantilever plate

Lee, C.-K.; Chiang, W.-W.; O’Sullivan, T. C.

doi:10.2514/6.1989-1390

Cited by 36 publications

(12 citation statements)

References 7 publications

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“…If the objective is to reduce the total energy in the system, then the location of the error sensors is critical to the performance of the control system. In fact, a significant effort has been devoted to the design and placement of distributed sensors and actuators for the control of sound in enclosures, vibration, and structural acoustic radiation (Bailey and Hubbard, 1985;Burke and Hubbard, 1987Clark and Fuller, 1992a, 1992cCollins et al, 1990Collins et al, , 1992Crawley and de Luis, 1987;Cunefare and Koopmann, 1991;Dimitriadis and Fuller, 1991;Elliott et al, 1987bElliott et al, , 1990Fuller, 1989;Fuller et al, 1990;Fuller, 1992a, 1992b;Lee et al, 1989Lee et al, , 1991Lee, 1990;Lee and Moon, 1990;Miller and Hubbard, 1987;Miller et al, 1990;Naghshineh and Koopmann, 1992;Silcox et al, 1989;Snyder and Hansen, 1991;Sommerfeldt and Scott, 1993;Wang et al, 1991). In the previously listed applications, the ultimate objective is to achieve an adaptive system for appropriate disturbance rejection.…”

Section: Introductionmentioning

confidence: 98%

Adaptive feedforward modal space control

Clark

1995

The Journal of the Acoustical Society of America

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An alternative method of implementing adaptive feedforward control is presented in this work based upon independent modal space control of reverberant systems. Multivariable control theory is used to derive the optimal feedforward compensators, and when the error sensors are constructed in modal coordinates, the optimal compensators reduce to a single coefficient filter per control channel (assuming the reference signal is available). If the control inputs are also implemented in modal coordinates, then the control system is termed noninteracting since each mode is orthogonal to the other. Adaptive feedforward modal space control is ideal for implementation of time-averaged gradient descent algorithms such as Newton's method since the optimal filter coefficient is obtained from a single iteration of the algorithm, and is insensitive to changes in the resonant frequencies of the reverberant system. Formulating the control system in modal coordinates also clearly illustrates the effect of causality and nonminimum phase characteristics on the ultimate performance of any adaptive feedforward control system, whether it is implemented in physical coordinates or modal coordinates. ¸

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Section: Introductionmentioning

confidence: 98%

Adaptive feedforward modal space control

Clark

1995

The Journal of the Acoustical Society of America

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“…One design method is to approximate the exact Linear Quadratic Regulator (LQR) controller solution with the finite element model (FEM) solution to generate the sensor shapes [6][7]. Other methods have utilized distributed sensors as modal sensors on structural systems [8][9][10]. With these sensor shape calculation methods becoming available, it is of interest to compare the experimental response of the distributed sensors to the response that is predicted by the design techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Pole Placement KernelsDistributed sensors that are responsive only to a particular mode have been designed and evaluated in the literature[8][9][10]. Since the designed pole placement controller is responsive only to a single mode of the structure, it is of interest to compare the resulting sensor shapes to the corresponding first mode modal sensor for the test article.…”

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confidence: 99%

<title>Controller implementation on infinite-order structural systems using distributed sensors</title>

1994

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The design of spatially shaped distributed sensors for the control of infinite order structural systems has become a topic of interest in recent years. Sensor shape optimization techniques were developed for the design of optimal controllers on infinite order structural systems. In this paper, we investigate methods for the implementation of distributed sensors using polyvinylidene fiouide (PVDF) film. The complexity of the sensor shapes depends on the mode shapes of the flexible structure and the performance measure of the controllers. The sensitivity of the sensor shape on the performance of the controller is being investigated. The problems associated with the practical implementation of distributed sensors with PVDF film are also identified.The shapes of the distributed sensors for the implementation of a linear quadratic regulator (LQR) and a pole-placement controller have been determined. These sensors are implemented on simple cantilever beam test articles using PVDF film. The details of hardware implementation of the controllers are presented. The closed loop performance of the controll'ers are compared with simulation studies. The sensitivity of the shapes of the distributed sensors for the LQR and pole-placement controllers is discussed.

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“…Different electroactive materials such as piezoceramics, shape memory alloys, electrorheological fluids, polymer biomaterials, magnetorestrictive materials are being considered for active control purposes. Much progress have been made in the direction of embedding sensors and actuators in smart structures [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. One of the critical issues in embedding smart patches (i.e., integrated sensors, actuators, electronics, and control) in smart structures is power delivery to and from the patches.…”

Section: Introductionmentioning

confidence: 99%

<title>Microstrip antennas for wireless communication in smart structures and active damping</title>

Khorrami¹,

Das²,

Nourbakhsh³

1997

SPIE Proceedings

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One of the critical issues in embedding smart patches (i.e., integrated sensors, actuators, electronics, and control) in smart structures is power delivery and communications to and from the patches. In this paper, design and experimentation of microstrip antenna elements and arrays integrated with piezoelectric substrates for novel wireless communication in smart structures are presented. Furthermore, we will discuss the general concept, analysis and design of microstrip antennas in a multilayered dielectric-piezoelectric environment , experimental demonstration of remote sensing and actuation mechanism, and address important considerations and potential practical applications.

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Piezoelectric modal sensors and actuators achieving critical active damping on a cantilever plate

Cited by 36 publications

References 7 publications

Adaptive feedforward modal space control

Adaptive feedforward modal space control

<title>Controller implementation on infinite-order structural systems using distributed sensors</title>

<title>Microstrip antennas for wireless communication in smart structures and active damping</title>

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