Topic
Piezoelectric sensor
About: Piezoelectric sensor is a research topic. Over the lifetime, 7127 publications have been published within this topic receiving 115903 citations.
Papers published on a yearly basis
Papers
More filters
Patent•
09 Jul 1992
TL;DR: In this paper, a sensor for force, acceleration or magnetism detection is provided which can carry out high accuracy detection without temperature compensation and easily manufactured, and four sets of detection elements (D1 to D4) are arranged.
Abstract: A sensor for force, acceleration or magnetism is provided which can carries out high accuracy detection without temperature compensation and easily manufactured. The peripheral portion of a disk-shaped substrate (10) having flexibility is fixed to a sensor casing (60), and a working body (50) is connected to the center portion. With respect to the origin (O) within the substrate (10), an X, Y and Z three-dimensional coordinate system is defined, and four sets of detection elements (D1 to D4) are arranged. Respective detection elements are of a sandwich structure in which piezoelectric elements (21, 23) are put between upper electrodes (31 to 34) and lower electrodes (41 to 44). When a force Fx in the X-axis direction is applied to the working body (50) by application of an acceleration, the substrate (10) is bent, so positive or negative charges are produced in respective electrodes. How charges are produced depends upon the direction of an applied force, and a quantity of charges produced depends upon the magnitude of the applied force. Thus, it is possible to detect components in respective axial directions of an applied force on the basis of a pattern of charges produced.
51 citations
TL;DR: In this article, a three-dimensional finite element model was developed for analyzing the response of active damping structures to steady state input in a closed loop, which indicated the significant and broad band attenuation capability of piezoelectric sensors and actuators.
Abstract: This is the first attempt at closed loop numerical simulation in the frequency domain using control theory and detailed finite element modeling of a smart structure with embedded piezoelectric sensors and actuators. A three-dimensional finite element model is developed for analysing the response of active damping structures to steady state input in a closed loop. Control authority resulting from charge or voltage as the active control force applied to the actuator are studied for the first two modes of vibration of a flexible beam. Comparison between constant velocity feedback control and constant displacement feedback control is also investigated. By applying an appropriate feedback control using the voltage generated by the piezoelectric sensor, substantial reduction of the resonance amplitude peaks of the cantilever beam is obtained. Numerical results are present which indicate the increase in damping as the feedback gain is increased. The results obtained clearly demonstrate the significant and broad band attenuation capability of piezoelectric sensors and actuators. A major advantage of active damping is to reduce the resonance peak without significantly altering the structural mass or stiffness.
51 citations
TL;DR: In this article, the basic constitutive equations and equations of motion for anisotropic porous piezoelectric materials by making use of variational principle were derived for threedimensional case and then reduced to the two-dimensional case by expanding mechanical displacement and electric potential as power series.
51 citations
TL;DR: It is discovered that grain boundaries (GBs) in monolayer MoS2 can significantly enhance its piezoelectric proper-ty and is demonstrated its potential in self-powered precision sensors for in-situ detecting pressure changes in human blood for the health monitoring.
Abstract: Recent discovery of piezoelectricity that existed in two-dimensional (2D) layered materials represents a key milestone for flexible electronics and miniaturized and wearable devices. However, so far the reported piezoelectricity in these 2D layered materials is too weak to be used for any practical applications. In this work, we discovered that grain boundaries (GBs) in monolayer MoS2 can significantly enhance its piezoelectric property. The output power of piezoelectric devices made of the butterfly-shaped monolayer MoS2 was improved about 50% by the GB-induced piezoelectric effect. The enhanced piezoelectricity is attributed to the additional piezoelectric effect induced by the existence of deformable GBs which can promote polarization and generates spontaneous polarization with different piezoelectric coefficients along various directions. We further made a flexible piezoelectric device based on the 2D MoS2 with the GBs and demonstrated its potential application in self-powered precision sensors for in situ detecting pressure changes in human blood for health monitoring.
51 citations
TL;DR: In this article, a model is developed to predict the dynamic response of a mechanical stack called a ''piezoceramic element'' which is composed of a piezoelectric sensor, a viscoelastic damper and an actuator of which the applied voltage is fed back by the sensor voltage.
Abstract: A model is developed to predict the dynamic response of a mechanical stack called a `piezoceramic element' which is composed of a piezoelectric sensor, a viscoelastic damper and a piezoelectric actuator of which the applied voltage is fed back by the sensor voltage. This stack works by stretching: a model based on Euler-Bernoulli beam equations is chosen. This model is then used to investigate the effect of the `piezoceramic element' on the active vibration control of a cantilevered beam. An optimal control law is determined by using a state observer and the Riccati equation. Finally, the theoretical results are simulated and compared with the results obtained in the open-loop condition.
50 citations