Experimental verification of distributed piezoelectric actuators foruse in precision space structures

Crawley, Edward F.; Luis, Javier

doi:10.2514/6.1986-878

Cited by 19 publications

(9 citation statements)

References 3 publications

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“…This technique is similar to the one demonstrated by Crawley and de Luis [8], but differs in that the sensing device they used was an accelerometer mounted at the freely oscillating tip of the beam, and was therefore not collocated with the sensor. This is an important feature, since spatial collocation of sensors and actuators radically simplifies the problem of controlling flexible structures.…”

Section: Piezoelectric Ceramic Actuatormentioning

confidence: 92%

“…Similar concerns arise regarding the interaction between structures and control methodologies for large space structures [8]. These techniques rely on a model of the flexural behavior of the link(s).…”

Section: Introductionmentioning

confidence: 99%

“…cantilever mode and the transducer is mounted close to the clamped end [8]. The time dependent signal was captured by a digitizing oscilloscope and the beam was permitted to vibrate when deflected at the free end and then released.…”

Section: Introductionmentioning

confidence: 99%

“…This condition of non-collocation of the vibrational coordinates and the actuators' degrees-of-freedom has hampered the satisfactory identification of a real-time controller. Furthermore, techniques for sensing have also relied on location of sensors remote from the actual vibrational coordinates [1][2][3][4][5][6]8].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Embedded Sensors and Actuators for Lightweight Structures

Schoenwald

1990

Review of Progress in Quantitative Nondestructive Evaluation

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Section: Piezoelectric Ceramic Actuatormentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Embedded Sensors and Actuators for Lightweight Structures

Schoenwald

1990

Review of Progress in Quantitative Nondestructive Evaluation

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“…(1), one may obtain (5) which shows that if p = o, then s = o, even*if v 0 5* o; i.e., no stresses develop in the determinate truss due to fabrication errors, thermal loads, or length changes paused by the control mechanisms (i.e., quantities represented by v 0 ). Suppose p = o and nonzero v 0 is caused by the length-changing mechanisms.…”

Section: Crane As An Adaptive Structurementioning

confidence: 98%

Control of a slow-moving space crane as an adaptive structure

Utku

Das

Wada³

et al. 1991

AIAA Journal

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If we assume that the space crane is a statically determinate truss with length-adjustable bars and take as controls the length adjustments of these bars, the computation of the incremental controls corresponding to the motion of a payload along a trajectory is given in terms of the inverse-transpose of matrix B of the joint equilibrium equations Bs = p, where s lists the bar forces and p the nodal loads. An algorithm with 0(w 2 ) computational complexity and 0(/z) storage demand is used for obtaining the inverse of the wth-order sparse matrix B. The compensation of the controls for elastic deformations and support movements is shown. The crane is assumed to be moving sufficiently slowly so that no vibratory motion is created during its maneuver. To simplify the computations, a zero-acceleration field is assumed in the workspace of the space crane. It is shown that the computations may be done automatically and in real time by an attached processor once the characteristics of the crane's maneuver are keyed in. I. TerminologyT HROUGHOUT this paper, an italic boldface letter indicates a free vector, while a lowercase boldface letter denotes a column matrix. Thus, r is a free vector and r a column matrix. A scalar is represented by an italic lightface letter and a matrix with more than one column by an upper case boldface letter. Thus, t and N are scalar variables, while B is a matrix with more than one column. Superscripts T and -1 stand for matrix transposition and inversion, respectively. A superscript -to any vector implies that it is derived from a larger vector by deleting a few rows. Thus, v '(t) stands for a vector that is obtained by deleting some of the rows of the vector v. Similarly, a superscript " to a matrix indicates that it is derived from a larger matrix by deleting a few columns. Thus, [B-1 ]" and [B' 7 ]" are matrices obtained from [B-1 ] and [B" 7 ], respectively, by deleting some columns.

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Active Damping

Miu

1993

Mechatronics

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Experimental verification of distributed piezoelectric actuators foruse in precision space structures

Cited by 19 publications

References 3 publications

Embedded Sensors and Actuators for Lightweight Structures

Embedded Sensors and Actuators for Lightweight Structures

Control of a slow-moving space crane as an adaptive structure

Active Damping

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