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 article, an extensional mode resonator (XMR) device is described by a model that predicts the power that is harvested as a function of the frequency and amplitude of the external vibration, the elastic and piezoelectric materials properties, and the device geometry.
36 citations
TL;DR: The study indicates the proposed piezoceramic sensing system can provide a promising low-cost, reliable and practical alternative for current WIM systems.
Abstract: In order to control the adverse effect of vehicles overloading infrastructure and traffic safety, weight-in-motion (WIM)-related research has drawn growing attention. To address the high cost of current piezoelectric sensors in installation and maintenance, a study on developing a low-cost piezoceramic sensing system is presented in this paper. The proposed system features distributed monitoring and integrated packaging, for calculating vehicle's dynamic load and its wheel position. Results from the laboratory tests show that the total output of the sensing system increases linearly with the increase of the peak load when the loading amplitude is 5-25 kN (equivalent to the half-axis load of 20-100 kN); when the loading frequency is between 15 Hz and 19 Hz (equivalent to a speed of 17.8-23.2 km/h), the total output of the system fluctuates around a value of 1.305 V. Combined with finite-element simulation, the system can locate load lateral position with a resolution of 120 mm. Due to the protection packaging, the peak load transferred to the sensing units is approximately 4.36% of the applied peak load. The study indicates the proposed system can provide a promising low-cost, reliable and practical alternative for current WIM systems.
35 citations
TL;DR: In this article, an analytical model of a plate with surface-bonded piezoelectric patches is derived and a μ-synthesis controller is designed to suppress multi-mode vibrations of the clamped plate under perturbations.
Abstract: Piezoelectric actuators and sensors are increasingly being used in applications involving vibration/position/shape control devices. Based on the self-sensing actuator (SSA) concept in which the sensors and actuators are seamlessly collocated, this paper presents a study on the robust control of a clamped plate. An analytical model of a plate with surface-bonded piezoelectric patches is derived and a μ-synthesis controller is designed to suppress multi-mode vibrations of the clamped plate under perturbations. The experimental results show that the symmetrical and asymmetrical modes can be effectively suppressed with designed feedback control using two piezoelectric patches which are positioned symmetrically and asymmetrically on the plate, respectively.
35 citations
TL;DR: The energy method of calculating the properties of piezoelectric electroacoustic transducers is considered and the governing equations are obtained by applying the Energy Conservation Law and equivalent circuit with one mechanical branch of the transducer is introduced.
Abstract: The energy method of calculating the properties of piezoelectric electroacoustic transducers is considered The Lagrangian of an electroacoustic transducer as a system performing multiple energy conversions is introduced The Euler equations describing operation of a transducer with many mechanical degrees of freedom are derived from the least action principle The corresponding multicontour equivalent circuit of the transducer is introduced For the particular case of a transducer having one mechanical degree of freedom the governing equations are obtained by applying the Energy Conservation Law, and equivalent circuit with one mechanical branch also introduced Application of the energy method is illustrated with examples of the pulsating spherical transducer as the one degree of freedom system and the multimode cylindrical transducer comprised of circular rings as the system with multiple degrees of freedom Advantages of the method for application with electroacoustic transducers are summarized
35 citations
TL;DR: The results show that the piezoelectric strain constant and dielectric constant can be increased by doping nano-ZnO in PVDF-TrFE, a thin film of polyvinylidene fluoride-trifluoroethylene that has good flexibility and simple preparation process.
Abstract: A thin film of polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) has good flexibility and simple preparation process. More importantly, compared with PVDF, its piezoelectric β-phase can be easily formed without mechanical stretching. However, its piezoelectricity is relatively lower. Therefore, at present, PVDF-TrFE is always compounded with other kinds of piezoelectric materials to solve this problem. The effect of nano-ZnO doping amount on the sensing characteristics of the piezoelectric films was studied. PVDF-TrFE/nano-ZnO films with different nano-ZnO contents were prepared by spin coating process and packaged. The dispersion of nano-ZnO dopants and the crystallinity of β-phase in piezoelectric films with different nano-ZnO contents were observed by scanning electron microscopy and X-ray diffraction, and the piezoelectric strain constants and dielectric constants were measured, respectively. The effect of different nano-ZnO contents on the output performance of the piezoelectric sensor was obtained by a series of impact experiments. The results show that the piezoelectric strain constant and dielectric constant can be increased by doping nano-ZnO in PVDF-TrFE. Moreover, the doping amount of nano-ZnO in PVDF-TrFE is of great significance for improving the piezoelectric properties of PVDF-TrFE/nano-ZnO thin films. Among the prepared piezoelectric films, the output voltage of PVDF-TrFE/nano-ZnO piezoelectric sensor with 7.5% nano-ZnO doping amount is about 5.5 times that of pure PVDF-TrFE. Thus, the optimal range of the doping amount for nano-ZnO is about 4–10%.
35 citations