New shear actuated smart structure beam finite element

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 378-383 ◽  
Author(s):  
A. Benjeddou ◽  
M. A. Trindade ◽  
R. Ohayon
Keyword(s):  
Finite Element ◽  
Smart Structure

Corrugated structures reinforced by shape memory alloy sheets: Analytical modeling and finite element modeling

2018 ◽  
Vol 233 (7) ◽  
pp. 2445-2454 ◽  
Author(s):  
Maryam Koudzari ◽  
Mohammad-Reza Zakerzadeh ◽  
Mostafa Baghani
Keyword(s):  
Finite Element ◽  
Shape Memory Alloy ◽  
Shape Memory Alloys ◽  
Finite Element Modeling ◽  
Shape Memory ◽  
Smart Structure ◽  
Design Parameters ◽  
Asymmetric Mode ◽  
Element Modeling ◽  
Structure Changes

In this study, an analytical solution is presented for a trapezoidal corrugated beam, which is reinforced by shape memory alloy sheets on both sides. Formulas are presented for shape memory alloys in states of compression and tension. According to the modified Brinson model, shape memory alloys have different thermomechanical behavior in compression and tension, and also these alloys would behave differently in different temperatures. The developed formulation is based on Euler–Bernoulli theory. Deflection of the smart structure and the effect of asymmetric response in shape memory alloys are studied. Results found from the semi-analytic modeling are compared to and validated through a finite element modeling, and there is more than [Formula: see text] agreement between two solutions. With regard to the results, the neutral axis of the smart structure changes in each section. The maximum deflection ratio of asymmetric mode to symmetric one mode is 1.7. Additionally, the effect of design parameters on deflection is studied in detail.

scholarly journals Research on Spillover Effects for Vibration Control of Piezoelectric Smart Structures by ANSYS

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Xingjian Dong ◽  
Zhike Peng ◽  
Wenming Zhang ◽  
HongXing Hua ◽  
Guang Meng
Keyword(s):  
Finite Element ◽  
Closed Loop ◽  
Parametric Design ◽  
Smart Structures ◽  
Element Model ◽  
Spillover Effects ◽  
Smart Structure ◽  
Control Laws ◽  
Actual Structure ◽  
New Approach

To control vibration of a piezoelectric smart structure, a controller is usually designed based on a reduced order model (ROM) of the system. When such a ROM based controller operates in closed loop with the actual structure, spillover phenomenon occurs because the unmodeled dynamics, which are not included in ROM, will be excited. In this paper, a new approach aiming at investigating spillover effects in ANSYS software is presented. By using the ANSYS parametric design language (APDL), the ROM based controller is integrated into finite element model to provide an accurate representation of what will happen when the controller is connected to the real plant. Therefore, the issues of spillover effects can be addressed in the closed loop simulation. Numerical examples are presented for investigating spillover effects of a cantilever piezoelectric plate subjected to various types of loading. The importance of considering spillover effects in closed loop simulation of piezoelectric smart structures is demonstrated. Moreover, the present study may provide an efficient method especially beneficial for preliminary design of piezoelectric smart structure to evaluate the performance of candidate control laws in finite element environment considering spillover effects.

scholarly journals Numerical and Experimental Study on Integration of Control Actions into the Finite Element Solutions in Smart Structures

2009 ◽  
Vol 16 (4) ◽  
pp. 401-415 ◽  
Author(s):  
L. Malgaca ◽  
H. Karagülle
Keyword(s):  
Finite Element ◽  
Vibration Control ◽  
Lead Zirconate Titanate ◽  
Smart Structures ◽  
Harmonic Excitation ◽  
Smart Structure ◽  
Displacement Sensor ◽  
Control Actions ◽  
First Case ◽  
Simulation Results

Piezoelectric smart structures can be modeled using commercial finite element packages. Integration of control actions into the finite element model solutions (ICFES) can be done in ANSYS by using parametric design language. Simulation results can be obtained easily in smart structures by this method. In this work, cantilever smart structures consisting of aluminum beams and lead-zirconate-titanate (PZT) patches are considered. Two cases are studied numerically and experimentally in parallel. In the first case, a smart structure with a single PZT patch is used for the free vibration control under an initial tip displacement. In the second case, a smart structure with two PZT patches is used for the forced vibration control under harmonic excitation, where one of the PZT patches is used as vibration generating shaker while the other is used as vibration controlling actuator. For the two cases, modal analyses are done using chirp signals; Control OFF and Control ON responses in the time domain are obtained for various controller gains. A non-contact laser displacement sensor and strain gauges are utilized for the feedback signals. It is observed that all the simulation results agree with the experimental results.

The vibration suppression of solar panel based on smart structure

2020 ◽  
Vol 125 (1283) ◽  
pp. 244-255
Author(s):  
G. Ma ◽  
M. Xu ◽  
J. Tian ◽  
X. Kan
Keyword(s):  
Finite Element ◽  
Vibration Control ◽  
Vibration Suppression ◽  
Fibre Composite ◽  
Smart Structure ◽  
Control Voltage ◽  
Control Force ◽  
Solar Panels ◽  
Flexible Bodies ◽  
Loop Control

ABSTRACTThis paper provides a solution to the active vibration control of a microsatellite with two solar panels. At first, the microsatellite is processed as a finite element model containing a rigid body and two flexible bodies, according to the principles of mechanics, and that the dynamic characteristics are solved by modal analysis. Secondly, the equation involving vibration control is established according to the finite element calculation results. There are several actuators composed of macro fibre composite on the two solar panels for outputting control force. Furthermore, the control voltage for driving actuator is calculated by using fuzzy algorithm. It is clear that the smart structure consists of the flexible bodies and actuators. Finally, the closed-loop control simulation for suppressing harmful vibration is established. The simulation results illustrate that the responses to the external excitation are decreased significantly after adopting fuzzy control.

scholarly journals The LQR Control Active of Smart Plate Based on the Finite Element Method

2017 ◽  
Vol 61 (2) ◽  
pp. 115
Author(s):  
Mohamed Latrache ◽  
Mohamed Nadir Amrane
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Study ◽  
Piezoelectric Materials ◽  
Fem Analysis ◽  
Piezoelectric Sensor ◽  
Smart Structure ◽  
Large Area ◽  
Area Of Interest ◽  
Element Method

This paper presents a numerical study pertaining to on the active vibration control (AVC) of the 3-D rectangle simply supported plate bonded of the piezoelectric sensor/ actuator pairs. AVC is a large area of interest either in all sections of industry or in research. One way to control the vibration of dynamic systems is by using piezoelectric materials. A finite element method (FEM) analysis is used to model the dynamic behavior of the system. The frequencies of the isotropic pate and a smart structure are verified by the comparison between the analytical calculations and simulation. A LQR controller is designed based on the independent mode space control techniques to stifle the vibration of the system. The change in the sizes of the patches was a clear impact on the control results, and also in the values of the voltage in actuator. The results were established by simulating in ANSYS and MATLAB.

Active Control of Thermally Induced Vibrations in Smart Structure Instrumented with Piezoelectric Materials

2014 ◽  
Vol 612 ◽  
pp. 169-174 ◽  
Author(s):  
Anshul Sharma ◽  
C.K. Susheel ◽  
Rajeev Kumar ◽  
V.S. Chauhan
Keyword(s):  
Finite Element ◽  
Fuzzy Logic ◽  
Negative Feedback ◽  
Fuzzy Logic Controller ◽  
Coupling Effect ◽  
Shear Deformation Theory ◽  
Smart Structure ◽  
Feedback Controller ◽  
Mechanical Coupling ◽  
Degenerated Shell Element

In this paper, a finite element model of piezolaminated composite shell structure is developed using nine-noded degenerated shell element. The stiffness, mass and thermo-electro-mechanical coupling effect is incorporated in finite element modeling using first order shear deformation theory and linear piezoelectric theory. The sensor voltage is calculated using the same formulation and fuzzy logic controller is used to calculate the actuator voltage. The fuzzy logic controller is designed as double input-single output (DISO) system using 49 If-Then rules. The performance of fuzzy logic controller is compared with convention constant-gain negative feedback controller. The simulation results illustrate the superiority of fuzzy logic controller over constant-gain negative feedback controller.

Finite element modeling of a piezoelectric smart structure for the cabin noise problem

1999 ◽  
Vol 8 (3) ◽  
pp. 380-389 ◽  
Author(s):  
Jaehwan Kim ◽  
Bumjin Ko ◽  
Joong-Keun Lee ◽  
Chae-Cheon Cheong
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Smart Structure ◽  
Element Modeling ◽  
Cabin Noise

Development of a hybrid (rigid-flexible) morphing leading edge equipped with bending and extending capabilities

2020 ◽  
pp. 1045389X2095390
Author(s):  
Amin Fereidooni ◽  
Jan Marchwica ◽  
Natalie Leung ◽  
Jaye Mangione ◽  
Viresh Wickramasinghe
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Shape Control ◽  
Geometry Optimization ◽  
Leading Edge ◽  
Smart Structure ◽  
Flexible Structure ◽  
Element Analysis ◽  
Readiness Level ◽  
Bench Model

The development of the bench model of a hybrid (rigid-flexible) morphing leading edge is presented in this paper. The distinctive feature of this design centers on compounding a fully rigid nose with a flexible structure to create a seamless morphing leading edge. The rigid nose guarantees a precise shape control in the aerodynamically critical region of the wing whereas the flexible structure allows for an increase in both chord length and its camber. These improvements offer potential solutions to many of the challenges reported in the literature about the existing morphing wing designs. In order to evaluate the feasibility of the hybrid (rigid-flexible) concept and to demonstrate the aforementioned improvements, a bench model is developed and tested in-house. This paper focuses on the analysis performed to develop this model, including (1) aerodynamic shape optimization to devise the desired drooped shape; (2) geometry optimization to specify the dimensions of the rigid nose; (3) finite element analysis to characterize the skin component of the flexible structure; and (4) finite element analysis to estimate the actuation authority. Overall, the numerical and experimental results reveal the inherent advantage of the hybrid (rigid-flexible) concept from the smart structure standpoint; however, significant considerations are required to advance the technical readiness level of this design to a commercially viable solution for aircraft manufacturers.

An Electric Node Concept for Solid-Shell Elements for Laminate Composite Piezoelectric Structures

2005 ◽  
Vol 72 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Lin-Quan Yao ◽  
Li Lu
Keyword(s):  
Exact Solution ◽  
Finite Element ◽  
Electric Fields ◽  
Electric Potential ◽  
Potential Distribution ◽  
Smart Structure ◽  
Finite Element Models ◽  
Solid Shell ◽  
Shell Elements ◽  
Electric Potential Distribution

The eight-node solid-shell finite element models have been developed for the analysis of laminated composite plate/shell structures embedded with piezoelectric actuators and sensors. To resolve the locking problems of the solid-shell elements in laminated materials and improve accuracy, the assumed natural strain method and hybrid stress method are employed. Introduction of the concept of the electric nodes can effectively eliminate the burden of constraining the equality of the electric potential for the nodes lying on the same electrode. Furthermore, the nonlinear electric potential distribution in piezoelectric layer is described by introducing internal electric potential. The developed finite element models, especially electric potential node model, are simpler over other models but can still obtain same accuracy as exact solution described. Several examples are studied and compared with exact solution and other predicted results to illustrate the accuracy of the present model, and efficacy and effect caused by nonlinear electric potential distribution on frequency and electric fields in smart structure modeling.

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