A Modified Electro-Mechanical Impedance Model of Piezoelectric Actuator-Sensors for Debonding Detection of Composite Patches

2002 ◽  
Vol 13 (6) ◽  
pp. 389-396 ◽  
Author(s):  
Y. G. Xu ◽  
G. R. Liu
Keyword(s):  
Piezoelectric Actuator ◽  
Mechanical Impedance ◽  
Impedance Model ◽  
Debonding Detection

scholarly journals Development of a Mechanical Impedance Model-Based Computer Simulator for Evaluation of an Active Headrest Mechanism in Rear-End Impact

2013 ◽  
Vol 6 (1) ◽  
pp. 73-88 ◽  
Author(s):  
Yoshiyuki TANAKA ◽  
Shunsuke FUKUSHIMA ◽  
Masaya YAMASHITA ◽  
Yoshinobu OOTANI ◽  
Toshio TSUJI
Keyword(s):  
Mechanical Impedance ◽  
Impedance Model ◽  
Computer Simulator ◽  
Model Based

scholarly journals Predicting the Dynamic Stiffness of a Glove Material using Mechanical Impedance Model

2019 ◽  
Vol 1262 ◽  
pp. 012028
Author(s):  
K. A. Md Razali ◽  
R. Samin ◽  
A. As’arry ◽  
N. A. A. Jalil
Keyword(s):  
Dynamic Stiffness ◽  
Mechanical Impedance ◽  
Impedance Model

Electro-Mechanical Impedance Measurements as a Possible SHM Method for Sandwich Debonding Detection

2017 ◽  
Vol 742 ◽  
pp. 763-777 ◽  
Author(s):  
Christoph Kralovec ◽  
Martin Schagerl
Keyword(s):  
Present Article ◽  
Health Monitoring ◽  
Sandwich Panel ◽  
Mechanical Impedance ◽  
Impedance Method ◽  
Constant Thickness ◽  
Fem Model ◽  
Impedance Measurements ◽  
Coupled Field ◽  
Debonding Detection

The present article addresses the evaluation of the electro-mechanical (E/M) impedance method as a Structure Health Monitoring (SHM) method to detect and classify damage, more specific, the debonding of a face layer.In the study the considered structure is simplified as a circular sandwich panel of constant thickness, consisting of isotropic face layers and a honeycomb core.The debonding is assumed to be circular and situated at the center of the panel, only variable in its radius.The article starts with a brief introduction to the basic idea of SHM and the fundamentals of the E/M impedance method.Further, the idealized setting is investigated by two sets of experiments whose results are analyzed by typically used damage metrics and by considering both analytical and numerical models.A coupled-field FEM model is developed and compared to the experimental results.Furthermore, an analytical model is derived to evaluate the experimental and numerical results.All results are presented and discussed extensively on pursuing the objective to detect and classify the size of a debonding.Finally, it is shown how a model based approach can predict the presence but also the size of a debonding in the considered sandwich panels based on the E/M impedance measurements.

Debonding Detection of Solid Rocket Motor Based on EMI Technology

2012 ◽  
Vol 538-541 ◽  
pp. 2117-2120
Author(s):  
Yu Xiang Zhang ◽  
Yun Zhou ◽  
Fu Hou Xu ◽  
Shi Yi Chen
Keyword(s):  
Detection Method ◽  
Mechanical Impedance ◽  
Rocket Motor ◽  
Mean Square ◽  
The Finite Element Method ◽  
Solid Rocket Motor ◽  
Monitoring Method ◽  
Debonding Detection ◽  
The Difference ◽  
Solid Rocket

At present, there is no effective online debonding monitoring method for solid rocket motor. In order to solve the problem, the electro-mechanical impedance (EMI) method is introduced into online debonding monitoring for solid rocket motor (SRM). The EMI model of PZT and SRM is developed. The finite element method is employed to analyze the electro-mechanical impedance of the PZT, the conductance curves of PZT are obtained with different damaging phase of SRM, the root-mean-square deviation (RMSD) is used to assess the aging level. The result indicates that EMI as a new detection method is effective in identifying the existence and severity of cracks in SRM. As the debonding area increases, the difference of conductance curves becomes more obvious and the RMSD becomes larger.

scholarly journals Mechanical Impedance Analysis of a Novel MEMS Photon Force Sensor

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 921
Author(s):  
Karolina Orłowska ◽  
Wojciech Majstrzyk ◽  
Andrzej Sierakowski ◽  
Tomasz Piasecki ◽  
Teodor Gotszalk
Keyword(s):  
Pressure Effect ◽  
Mechanical Impedance ◽  
Impedance Analysis ◽  
Force Sensor ◽  
Laser Vibrometer ◽  
Radiation Beam ◽  
Impedance Model ◽  
Mems Sensor ◽  
Thermal Actuation ◽  
Low K

In this work we present how to describe mechanical impedance of a photon force (PF) MEMS sensor dedicated to structures’ optomechanical studies. An actuating force (photon force) is caused by the reflection and absorption of the electromagnetic radiation beam due to the radiation pressure effect. Specially designed very soft (low k-constant, ca 10–150 mN/m) cantilevers are presented. The structures integrate a Lorentz loop, which enables electromagnetic actuation. The construction with two mirrors is proposed so that parasitic thermal actuation can be neglected. The MEMS displacement is measured with the use of a laser vibrometer. The mechanical impedance model is presented using which the stiffness is calculated. As validation measurements: thermal noise and known mass adding methods are used.

Electro-mechanical impedance model of a laminated rectangular plate with imperfect interfaces

2019 ◽  
Vol 30 (20) ◽  
pp. 2982-2994
Author(s):  
Tianbi Lv ◽  
Wei Yan ◽  
Junhua Li
Keyword(s):  
Rectangular Plate ◽  
Three Dimensional ◽  
Mechanical Impedance ◽  
Theory Of Elasticity ◽  
Impedance Model ◽  
Interfacial Conditions ◽  
Interfacial Defects ◽  
Linear Spring ◽  
Elastic Layers ◽  
Laminated Structures

A laminated orthotropic rectangular plate surface-bonded or embedded with a piezoelectric actuator/sensor is investigated based on the state-space approach. A linear spring-like model is utilized to simulate the interfacial imperfections. Besides, to establish the global transfer relations between the elastic variables of the elastic layers and the piezoelectric films, a matrix reduction technique is employed. Then, an analytical expression of electro-mechanical impedance, which contains the information of the interfacial bonding, is derived based on the three-dimensional theory of elasticity (or piezoelasticity). Numerical results show that the signals extracted from the present electro-mechanical impedance model can detect the interfacial conditions of laminates, and hence, the present analysis provides an efficient and convenient approach to monitor the interfacial defects in the laminated structures.

An Impedance-Based System Modeling Approach for Induced Strain Actuator-Driven Structures

1996 ◽  
Vol 118 (3) ◽  
pp. 323-331 ◽  
Author(s):  
Su-Wei Zhou ◽  
Chen Liang ◽  
C. A. Rogers
Keyword(s):  
System Modeling ◽  
Dynamic Performance ◽  
Mechanical Impedance ◽  
Theoretical Development ◽  
Thin Plates ◽  
Impedance Model ◽  
Modeling Approach ◽  
Impedance Modeling ◽  
Output Behavior ◽  
Insight Into

This paper presents the theoretical development and experimental verification of a system model of piezoelectric (PZT) patch actuators for induced strain actuation of two-dimensional active structures. The model includes the dynamic interaction between PZT actuators and their host structures. Analytical solutions of the output behavior of the PZT actuators have been developed based upon the actuator input impedance and the mechanical impedance of the host structures. The impedance-based model was then applied to thin plates and thin shells, and to beams. The case studies demonstrate the generality and utility of the impedance modeling approach. A simply-supported thin plate with surface-bonded PZT patches was built and tested so that the ability of the impedance model to accurately predict the dynamic performance of the actuator and the host structure has been verified. When compared with conventional static models, the impedance modeling method offers insight into the dynamic coupling of the integrated PZT/substrate systems.

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