Active control of flexible structures by use of segmented piezoelectric elements

1996 ◽  
Vol 19 (4) ◽  
pp. 808-815 ◽  
Author(s):  
J. Callahan ◽  
H. Baruh
Keyword(s):  
Active Control ◽  
Flexible Structures ◽  
Piezoelectric Elements

Active control of flexible structures using a fuzzy logic algorithm

2002 ◽  
Vol 11 (4) ◽  
pp. 541-552 ◽  
Author(s):  
Kelly Cohen ◽  
Tanchum Weller ◽  
Joseph Z Ben-Asher
Keyword(s):  
Fuzzy Logic ◽  
Active Control ◽  
Flexible Structures ◽  
Fuzzy Logic Algorithm

An active control logic to improve the fatigue strength of smart flexible structures

2013 ◽  
Author(s):  
Pasquale Ambrosio ◽  
Francesco Braghin ◽  
Ferruccio Resta ◽  
Francesco Ripamonti
Keyword(s):  
Fatigue Strength ◽  
Active Control ◽  
Flexible Structures ◽  
Control Logic

Wireless Control of Parabolic Shells Using Photostrictive Actuators

2006 ◽  
Author(s):  
Hui-Ru Shih ◽  
Horn-Sen Tzou
Keyword(s):  
Shell Model ◽  
Active Control ◽  
Mechanical Energy ◽  
Flexible Structures ◽  
Approximate Model ◽  
Control Action ◽  
Shells Of Revolution ◽  
Parabolic Shell ◽  
Control Forces ◽  
Photostrictive Actuators

Photostrictive actuator, which can turn light energy into mechanical energy, is a new promising photoactuation technique for non-contact wireless active control of flexible structures. Optical mirrors, communication antennas, solar/optical reflectors, nozzles, rocket fairings, etc. often have the shape of parabolic shells or shells of revolution, due to their required focusing, aiming, or reflecting performance. In this paper, the active control of flexible parabolic shells using discrete photostrictive actuators is investigated. Parabolic shell of revolution is considered one of the most difficult geometry among all shell and non-shell structures. Because of this, an approximate way to estimate the dynamic behavior and light-induced control forces of a photostrictive coupled parabolic shell is presented. Based on the approximate model, the effects of actuator locations as well as membrane and bending components on the control action are analyzed. The results obtained indicate that the control forces are mode and location dependent. It is also shown by analysis that the membrane control action is much more significant than the bending control action. The validation of the approximate model is done by comparing the light-induced control forces of the photostrictive coupled shells obtained by the approximate equivalent spherical shell model and those obtained by the parabolic shell model.

Application of Improved Genetic Algorithms for Sensor and Actuator Placement of Active Flexible Structures

2006 ◽  
Author(s):  
Jingjun Zhang ◽  
Ji Zheng ◽  
Ruizhen Gao
Keyword(s):  
Design Principle ◽  
Fisher Information Matrix ◽  
Information Matrix ◽  
Flexible Structures ◽  
Optimization Method ◽  
Mode Shapes ◽  
Flexible Structure ◽  
Ansys Software ◽  
Piezoelectric Elements ◽  
Actuator Placement

In order to reduce the vibration of flexible structures, this paper developed an effective procedure to determine the location of multi-piezoelectric elements in active flexible structures. The D-optimal design principle is an optimization method which chosen by the maximum determinant of Fisher Information Matrix Criteria. Study on the mode shapes and dynamic characteristics of structure, and the mode shapes of selected structural are converted into unitary mode. In order to approach higher level of vibration control, piezoelectric patches are placed on the maximum mode strain locations of the structure. The mode shapes of flexible structure are extracted and analysed using the Ansys software, and an interface is completed between the GAs and Ansys software.

Optimal sensor location in active control of flexible structures

AIAA Journal ◽  
1996 ◽  
Vol 34 (4) ◽  
pp. 857-859 ◽  
Author(s):  
Andrzej Mackiewicz ◽  
Jan Holnicki-Szulc ◽  
Francisco Lopez-Almansa
Keyword(s):  
Active Control ◽  
Flexible Structures ◽  
Sensor Location ◽  
Optimal Sensor Location

Active Control of Flexible Structures

2010 ◽  
Author(s):  
Alberto Cavallo ◽  
Giuseppe De Maria ◽  
Ciro Natale ◽  
Salvatore Pirozzi
Keyword(s):  
Active Control ◽  
Flexible Structures

scholarly journals Erratum for “Active Control of Flexible Structures”

1979 ◽  
Vol 105 (11) ◽  
pp. 2473-2473
Author(s):  
Mohamed Abdel-Rohman ◽  
Horst H. Leipholz
Keyword(s):  
Active Control ◽  
Flexible Structures
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