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

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

Numerical and experimental study of an active control logic for modifying the acoustic performance of single-layer panels

2021 ◽  
pp. 116608
Author(s):  
Francesco Ripamonti ◽  
Anthony Giampà ◽  
Riccardo Giona ◽  
Ling Liu ◽  
Roberto Corradi
Keyword(s):  
Experimental Study ◽  
Active Control ◽  
Single Layer ◽  
Control Logic ◽  
Acoustic Performance

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.

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

Active Control of a Plate Using Segmented Distributed Sensors and Actuators: Finite Element Development and Analysis

1991 ◽  
Author(s):  
H. S. Tzou ◽  
H. Bahrami
Keyword(s):  
Finite Element ◽  
Active Control ◽  
Variational Equation ◽  
Flexible Structures ◽  
Monitoring And Control ◽  
Sensors And Actuators ◽  
Distributed Sensors ◽  
Computation Efficiency ◽  
Piezoelectric Structure ◽  
And Control

Abstract Distributed sensing and control of flexible structures have drawn much attention in recent years. Piezoelectric elements can be used with an elastic structure as sensors and actuators for structural monitoring and control applications. This paper presents a development of a thin piezoelectric finite element applied to active control of flexible structures. A piezoelectric finite element is derived using the variational equation and Hamilton’s principle. System equations of a piezoelectric structure are formulated accordingly. Guyan’s reduction technique is incorporated to improve the computation efficiency. Feedback control algorithms are also derived and implemented in the finite element code. Applications of the technique to a plate with segmented distributed sensora/actuators are studied and effectiveness evaluated.

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