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.

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.

Dynamic Analysis of Sandwich Beams Filled with ER Elastomers

2011 ◽  
Vol 50-51 ◽  
pp. 843-848 ◽  
Author(s):  
Quan Bai ◽  
Ke Xiang Wei ◽  
Wen Ming Zhang
Keyword(s):  
Finite Element ◽  
Electric Field ◽  
Vibration Control ◽  
Natural Frequencies ◽  
Flexible Structures ◽  
Sandwich Beam ◽  
Element Model ◽  
Sandwich Beams ◽  
Simulation Results ◽  
Er Fluids

Considered electrorheological (ER) elastomers as the visco-elasticity material, a finite element model of a sandwich beam filled with ER elastomers was developed based on Hamilton’s principle and sandwich beam’s theory. Then its dynamic characteristics were analyzed. Simulation results show that natural frequencies of the sandwich beam increase and vibration amplitudes of the beam decrease as the intensity of applied electric field increases. Increased the thickness of the ER elastomers layer, natural frequencies of the beam decrease and loss factors increase. Those indicate that the dynamic characteristic of ER elastomers sandwich beams is similar as that of ER fluids beam, which can be used for vibration control of flexible structures by applied a electric field.

Analysis and implementation of MIMO FULMS algorithm for active vibration control

2011 ◽  
Vol 34 (7) ◽  
pp. 815-828 ◽  
Author(s):  
Xiaojin Zhu ◽  
Zhiyuan Gao ◽  
Quanzhen Huang ◽  
Shouwei Gao ◽  
Enyu Jiang
Keyword(s):  
Vibration Control ◽  
Lead Zirconate Titanate ◽  
Vibration Suppression ◽  
Active Vibration Control ◽  
Reference Signal ◽  
Optimal Placement ◽  
Mean Square ◽  
Least Mean Square ◽  
Active Vibration ◽  
Simulation Results

This correspondence focuses on the analysis and implementation of multi-input multi-output (MIMO) filtered-u least mean square (FULMS) algorithm for active vibration suppression of a cantilever smart beam with surface bonded lead zirconate titanate patches. By analysing a single-input single-output FULMS algorithm, the MIMO FULMS controller structure is given. Then an active vibration control experimental platform is established, with optimal placement of the actuators and sensors based on the maximal modal force rule. Simulation contrast analysis of FULMS algorithm and the most famous filtered-x least mean square (FXLMS) algorithm is performed while the reference signal is extracted from the exciter as well as directly from the controlled structure. Simulation results show that if the feedback information reflects the reference signal collected by the reference transducers, the FXLMS controller could hardly suppress the vibration while the FULMS controller is still effective. Then the actual control experiment is performed, and the result confirms the simulation results. The designed MIMO FULMS vibration controller has a good control performance, suppressing the vibration significantly with rapid convergence.

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.

The Application Of Computer Algebra In Modelling And Vibration Control Of A Flexible Manipulator

2012 ◽  
Author(s):  
Z. Mohamed ◽  
A. A. Mohd Faudzi ◽  
M. N. Ahmad ◽  
Z. M Zain ◽  
A. W. I. Mohd Hashim
Keyword(s):  
Finite Element ◽  
Transfer Function ◽  
Vibration Control ◽  
Computer Algebra ◽  
Flexible Manipulator ◽  
Input Shaping ◽  
Control Scheme ◽  
Simulation Results ◽  
And Control ◽  
Symbolic Algorithm

Kertas kerja ini membentangkan aplikasi algebra computer utk pemodelan dan kawalan getaran sistem manipulator boleh ubah (flexible manipulator). Sebuah model berasaskan simbol menspesifikasikan sifat manipulator telah dibina menggunakan bahasa simbolik berasaskan finite element dan Lagrange. Menggunakan pendekatan ini, transfer function diperoleh dalam bentuk simbolik. Analisis dilaksanakan untuk mengkaji signifikan dan relasi pemboleh ubah fizikal manipulator boleh ubah tersebut dengan sistem tertentu termasuk poles, zeros, kestabilan, frekuensi getaran dan tertentu fasa non minimum sistem tersebut. Hasil akhir simbolik tersebut kemudian digunakan untuk mereka cipta input shaping getaran skema kawalan. Hasil akhir simulasi dari respons manipulator dibentangkan untuk mendemontrasi aplikasi algorithm dalam pemodelan dan kawalan sesebuah manipulator boleh ubah. Kata kunci: Algebra computer, manipulator boleh ubah, pemodelan, kawalan getaran This paper presents the application of computer algebra to modelling and vibration control of a flexible manipulator system. A symbolic–based model characterising the behaviour of the manipulator is developed using a symbolic language based on finite element and Lagrange methods. In this approach, the system transfer function is obtained in symbolic form. Analyses are carried out to investigate the significance and relations of the physical parameters of the flexible manipulator with the system characteristics including poles, zeros, stability, vibration frequencies and non-minimum phase characteristics of the system. The symbolic results are then used to design an effective input shaping vibration control scheme. Simulation results of the response of the manipulator are presented to demonstrate the application of the symbolic algorithm in modelling and control of a flexible manipulator. The symbolic results are then used to design an effective input shaping vibration control scheme. Simulation results of the response of the manipulator are presented to demonstrate the application of the symbolic algorithm in modelling and control of a flexible manipulator. Key words: Computer algebra; flexible manipulator; modelling; vibration control

Dynamic Analysis of Piezoelectric Smart Structures

2011 ◽  
Vol 295-297 ◽  
pp. 1353-1356
Author(s):  
Jie Li ◽  
Li Li Hu ◽  
Li Qin ◽  
Jun Liu ◽  
Rui Ping Tao ◽  
...  
Keyword(s):  
Vibration Control ◽  
Smart Structures ◽  
Active Vibration Control ◽  
Smart Structure ◽  
Response Analysis ◽  
Ansys Software ◽  
Model Calculations ◽  
Response Characteristics ◽  
Ansys Simulation ◽  
Active Vibration

In order to solve the active vibration control of piezoelectric smart structures, focus problems on the structural analysis of the dynamic characteristics. To piezoelectric smart structure for the research object, finite element modal analysis, solving the natural frequency and response characteristics. Firstly, analyzed the problems of structural eigenvalues ​​and eigenvectors problems, then prepared dynamic response analysis program of FEM based on MATLAB, and complete the theoretical model calculations. At the same time, using ANSYS software to simulate and analyze, theresults show that, ANSYS simulation result is consistent with the theoretical value, so as to study the piezoelectric active vibration control of smart structures and lay a good foundation.

Finite element approaching analysis of load localization and identification for smart structures

2019 ◽  
Vol 11 (1) ◽  
pp. 29-44
Author(s):  
Hua Li ◽  
Lufeng Jia
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Smart Structures ◽  
Optimization Technique ◽  
Load Condition ◽  
Smart Structure ◽  
Load Identification ◽  
Content Type ◽  
Identification Model ◽  
Element Method

Purpose The purpose of this paper is to propose a numerical approaching analysis method combining the sequential unconstrained minimization technique and finite element method to identify the loading condition and geometry of smart structures accurately. Design/methodology/approach A new load identification model is built and the finite element approaching method is proposed by the combination of finite element method and optimization technique. Findings The approaching algorithm has good convergence and fast approximation speed; the accuracy can meet the engineering requirements. The approaching model is simple, and the precision is controllable and it can be used to solve the load identification problem of the smart material structure. Originality/value In view of the cited papers, the information sensed by the smart structure is limited, discrete and contains certain errors. How to derive the cause from the limited, error-containing discrete information is an important problem that needs to be solved by the self-diagnosis function. A load identification model based on structural displacement response is established and a numerical approximation method is proposed by combining the finite element method with the optimization technique; the load magnitude and position of the structure are identified according to the displacement measurement values of the internal finite point in the structure under the load condition.

scholarly journals Closed Loop Finite Element Modeling of Piezoelectric Smart Structures

2006 ◽  
Vol 13 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Guang Meng ◽  
Lin Ye ◽  
Xing-jian Dong ◽  
Ke-xiang Wei
Keyword(s):  
Finite Element ◽  
Closed Loop ◽  
Smart Structures ◽  
State Space Model ◽  
Element Model ◽  
Smart Structure ◽  
Control Law ◽  
Linear Quadratic ◽  
Design Scheme ◽  
Analysis Scheme

The objective of this paper is to develop a general design and analysis scheme for actively controlled piezoelectric smart structures. The scheme involves dynamic modeling of a smart structure, designing control laws and closed-loop simulation in a finite element environment. Based on the structure responses determined by finite element method, a modern system identification technique known as Observer/Kalman filter Identification (OKID) technique is used to determine the system Markov parameters. The Eigensystem Realization Algorithm (ERA) is then employed to develop an explicit state space model of the equivalent linear system for control law design. The Linear Quadratic Gaussian (LQG) control law design technique is employed to design a control law. By using ANSYS parametric design language (APDL), the control law is incorporated into the ANSYS finite element model to perform closed loop simulations. Therefore, the control law performance can be evaluated in the context of a finite element environment. Finally, numerical examples have demonstrated the validity and efficiency of the proposed design scheme. Without any further modifications, the design scheme can be readily applied to other complex smart structures.

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