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piezoelectric-patches
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Effects of Piezoelectric Patches Placement and Sizing on Dynamic Behavior of Multilayer Sandwich Panels using Finite Element Method
, M.Sc. Thesis Sharif University of Technology ; Hosseini Kordkheili, Ali (Supervisor)
Abstract
This thesis focuses on how the dimensions and location of piezoelectric patches affect thedynamic behavior of multi layered sandwich panels by the use of finite element method (FEM). To accomplish this objective the finite element formulation of the problem, including coupling of electrical and mechanical characteristic equations for piezoelectric patches is derived. Finite element modeling of sandwich panels is presented on the basis of classic theory and also first order shear displacement hypothesis for multi-layered plates. To perform finite element analysis, ABAQUS is utilized and the development procedure of a finite element model by this software is also introduced. After verifying...
Delamination Effect on Frequecny Response of a Laminated Composite Plate Using Piezoelectric Patches
, M.Sc. Thesis Sharif University of Technology ; Hosseini Kordkheili, Ali (Supervisor)
Abstract
Composite structures are subjected to different kinds of loadings in different workspaces, and sometimes these load conditions can damage them. Delamination is a common damage in composites. In this research, the delamination effect on modal behavior of a laminated composite plate is studied. To investigate this effect, the frequency response method is used and piezoelectric patches are used as a sensor and an actuator for extracting the frequency response. The aim of this project is to investigte presence and severity of the delamination. To survey the frequency response method, an intact and some damaged plates with one sensor and actuator are modeled with abaqus software and frequency...
investigation of the Effect of Piezo-Electric Patch on the Modal Properties and Flutter Speed of Turbomachine Blade
, M.Sc. Thesis Sharif University of Technology ; Haddadpour, Hassan (Supervisor)
Abstract
In order to investigaton of dynamics behavior and determination of the aeroelastic stability of the turbomachine blade. the turbomachine blade is modeled by using the beam model, taking into account all degrees of freedom, the effect of warping, rotation and seting angle. For aerodynamic modeling, the Smith and Whitehead models are used which are valid in subsonic flow. The validity of the derived formulation is confirmed through comparison with those obtained from the finite element software and the available results in the literature. Then, by using the state feedback controller, the effect of sensor and piezoelectric actuator on the vibrations reduction of the structure and increasing the...
Seismic Control of Steel Structures Through Application of Active Piezoelectric Patches
, M.Sc. Thesis Sharif University of Technology ; Rahimazadeh Rofooei, Fayyaz (Supervisor)
Abstract
The main purpose of this research is to investigate the possibility of using piezoelectric patches for active control of a number of steel moment resisting frames (MRF) structures under seismic loading. For this purpose, the response parameters of 3 structural models with different numbers of stories and bays are considered. Piezoelectric patches which are connected to different parts of beams and columns are used to apply the calculated control forces. For this purpose, Sap2000 software is used for preparing the structural models and the MATLAB software is utilized to compute the required control forces and optimal placement of the piezoelectric patches. Furthermore, the nonlinear behavior...
Frequency domain identification of a tapered beam embedded by piezoelectric layer
, Article 2016 International Conference on Advanced Mechatronic Systems, ICAMechS 2016, 30 November 2016 through 3 December 2016 ; 2017 , Pages 312-317 ; 23250682 (ISSN); 9781509053469 (ISBN) ; Ahranjani, F. F ; Kamankesh, Z ; Sharif University of Technology
IEEE Computer Society
2017
Abstract
This study is conducted aiming to identify the dynamics of a tapered beam, embedded by piezoelectric layer. Narrowing the tip of the beam equipped with piezoelectric patches leads to optimize the output power after excitation by the frequency sweep input. An accelerometer is installed on the beam base, which measures the acceleration that is applied to the system. Piezoelectric sensors also measure the generated voltage. The experimental test data is handled through CIFER software, using Fourier transform and Bode plot in the frequency domain, to obtain appropriate transfer functions. MATLAB is used for nonlinear simulation and validation of discrete transfer functions by a set of data that...
Application of active piezoelectric patches in controlling the dynamic response of a thin rectangular plate under a moving mass
, Article International Journal of Solids and Structures ; Volume 46, Issue 11-12 , 2009 , Pages 2429-2443 ; 00207683 (ISSN) ; Nikkhoo, A ; Sharif University of Technology
2009
Abstract
The governing differential equation of motion for an undamped thin rectangular plate with a number of bonded piezoelectric patches on its surface and arbitrary boundary conditions is derived using Hamilton's principle. A moving mass traveling on an arbitrary trajectory acts as an external excitation for the system. The effect of the moving mass inertia is considered using all the out-of-plane translational acceleration components. The method of eigenfunction expansion is used to transform the equation of motion into a number of coupled ordinary differential equations. A classical closed-loop optimal control algorithm is employed to suppress the dynamic response of the system, determining the...
Using piezoelectric materials to control the dynamic response of a thin rectangular plate under moving mass
, Article 11th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC-11, Taipei, 19 November 2008 through 21 November 2008 ; January , 2008 ; Rofooei, F. R ; Sharif University of Technology
2008
Abstract
The governing differential equation of motion for an undamped thin rectangular plate with a number of bonded piezoelectric patches on its surface, and arbitrary boundary conditions are derived using Hamilton's principle. A moving mass traveling on an arbitrary trajectory acts as an external excitation for the system. The effect of moving mass inertia is considered using all the out-of-plane translational acceleration components. The method of eigenfunction expansion is used to decouple the equation of motion into a number of coupled ordinary differential equations. A classical closed loop optimal control algorithm is employed to suppress the dynamic response of the system by determining the...
Hybrid fibrous (PVDF-BaTiO3)/ PA-11 piezoelectric patch as an energy harvester for pacemakers
, Article Journal of Industrial Textiles ; Volume 51, Issue 3_suppl , 2022 , Pages 4698S-4719S ; 15280837 (ISSN) ; Kamali Dehghan, H ; Mashayekhan, S ; Bagherzadeh, R ; Sorayani Bafqi, M. S ; Sharif University of Technology
SAGE Publications Ltd
2022
Abstract
Lithium batteries have been widely used to power up implantable medical devices such as pacemakers that are often designed to treat, diagnose, and prevent different diseases. However, due to their limited capacity and lifetime, patients have to undergo a surgical procedure to replace the discharged battery. Recently, nanogenerators have been emerged and are broadly accepted since they can convert tiny biomechanical forces, such as heartbeats, into electrical energy. This study aims to manufacture a biocompatible and high-performance piezoelectric energy harvester (PEH) that is capable to be charged by the energy received from the heartbeat and store the generated voltage. In this research, a...