Topic
Piezoelectric sensor
About: Piezoelectric sensor is a research topic. Over the lifetime, 7127 publications have been published within this topic receiving 115903 citations.
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TL;DR: In this paper, an approach to the detection of the strains and optimization of shape memory alloys (SMAs) under low velocity impact is presented. But, it is assumed that the sensor is mounted on the opposite side of the impact process.
33 citations
Patent•
31 May 1995TL;DR: In this article, a flat compound piezoelectric sheet (4) is used for sound reproduction with a desirable frequency properties that have little distortion, and a support frame is provided at its circumference.
Abstract: Disclosed is a piezoelectric loudspeaker. According to the present invention, a piezoelectric loudspeaker (2) comprises a flat compound piezoelectric sheet (4) in which multiple piezoelectric devices (14) are arranged in an organic material (16); electrodes (6A, 6B) which are provided on respective surfaces of the compound piezoelectric sheet (4); an acoustic impedance matching support layer (8) for maintaining the flat compound piezoelectric sheet (4) in a curved shape and for matching an acoustic impedance; and a support frame (10) for supporting the compound piezoelectric sheet (4) at its circumference. Thus, sound reproduction with a desirable frequency properties that have little distortion can be performed.
33 citations
TL;DR: In this article, a GA was designed to search for optimal actuator voltage and displacement control gains for the shape control of the functionally graded material (FGM) plates, which can be readily treated using GA.
Abstract: This paper deals with optimal shape control of functionally graded smart plate containing patches of piezoelectric sensors and actuators. The genetic algorithm (GA) is designed to search for optimal actuator voltage and displacement control gains for the shape control of the functionally graded material (FGM) plates. The work extends the earlier finite element formulations of the two leading authors, so that it can be readily treated using genetic algorithms. Numerical results have been obtained to study the effect of the shape control of the FGM plates under a temperature gradient by optimising (i) the voltage distribution for the open loop control, and (ii) the displacement control gain values for the closed loop feedback control. The effect of the constituent volume fractions of zirconia, through varying the volume fraction exponent n, on the optimal voltages and gain values has also been examined.
33 citations
TL;DR: In this article, the influence of bonding defects at the interface between the piezoelectric sensor and the tested medium is considered and a model is proposed to calculate the modifications of the electrical impedance due to defects of this type.
Abstract: When a piezoelectric element is inserted into a medium, it is now well-established that the viscoelastic properties of this medium can easily be deduced from the measurement of the electrical impedance of this element and by using an appropriate optimization algorithm. This paper essentially deals with the influence of bonding defects at the interface between the piezoelectric sensor and the tested medium. First, a model is proposed to calculate the modifications of the electrical impedance due to defects of this type. The validity of this approach is demonstrated by comparing the theoretical predictions with the results obtained experimentally for different samples with well-defined bonding defects. Then, with this model, it is easy to determine the electrical impedance of an embedded piezoelectric element, whatever the value of the relative area on which the bonding defect occurs. In order to simulate what will happen in practice when we ignore that these defects are present, such simulated electrical impedances are processed with the usual optimization algorithm, assuming perfect bonding. Obviously, the viscoelastic properties of the tested medium are subject to error, as the size of the non-bonded area increases. It is shown that a very efficient tool based on the Kramers - Kronig relationships can be used to check the correctness of the extracted parameters.
33 citations
TL;DR: In this paper, an online instantaneous baseline structural damage detection using a low cost and low power, in-situ piezoelectric guided waves-SHM system is presented.
Abstract: In recent years, new Structural Health Monitoring (SHM) methodologies with a concept of “instantaneous baseline damage detection” are being developed by many researchers since it has been found that the most of SHM technologies are too vulnerable to environmental and/or operational variations. In this context, this paper presents online instantaneous baseline structural damage detection using a low cost and low power, in-situ piezoelectric guided waves-SHM system. Firstly, four small, low cost and light weight smart Piezoelectric Ceramic (PZT) patches are surface-mounted and assumed to have the same bonding conditions to detect structural defects on an aluminum plate. Then, a miniaturized low power guided waves-SHM system with a Digital Signal Processing (DSP) module is employed for signal generation/excitation, signal sensing, and data processing. The instantaneous baseline damage detection based on Wavelet Transform (WT) and Cross Correlation (CC) analysis is carried out on the DSP module. Finally, effects of Lamb waves due to artificial ‘cut-damage’ at different locations are investigated using both “pitch-catch” and “pulse-echo” wave propagation schemes. Conclusively, this study shows a good potential for online and in-situ crack monitoring on panel structures such as an aircraft wing.
33 citations