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Investigation on Sensor Fault Effects of Piezoelectric Transducers on Wave Propagation and Impedance Measurements

For active Structural Health Monitoring (SHM), one popular sensor type is the piezoelectric wafer active sensor (PWAS) due to its multi-purpose application as actuator and sensor and its low cost. It is used to generate a wave field, which interacts with the structure and is recorded by a second set of PWASs. This method is called acousto ultrasonics. The change in wave field from transducer damage is modeled in CO ...
www.comsol.com/paper/15458

Thermal Analysis of a Piezo-Disk Ultrasound Probe

Ultrasound imaging probes are widely used for several types of diagnosis applications. In the present work we focus our attention on a disk-type probe, which is widely used in CW and PW operating conditions. In particular we present a 2D-axial symmetry FEM for the probe, capable to predict both the operative temperature values at different driving signal frequencies, both the heating dynamics. Moreover, the FEM is va ...
www.comsol.com/paper/12562

Ultrasound Piezo-Disk Transducer Model For Material Parameter Optimization

The technology involved in high performance ultrasound imaging probes needs a reliable model to help in new projects development and performance simulations. To achieve a useful model, it is necessary to use correct values for all material parameters involved in the electro-acoustical performances of the piezoelectric material, but unfortunately some of these parameters are known only with high uncertainty and other ...
www.comsol.com/paper/7876

Simulation of a Forming Process for Joining a Piezo Aluminium Module

The fabrication of piezo aluminium composite modules for sensor and actor applications with mass production technologies is in the scope of the SFB/Transregio 39 PT-PIESA project funded by the (German Research Foundation ...). After forming of cavities with a width of 0.3 mm into aluminium sheets by micro impact extrusion and the insertion of 0.25 × 0.25 mm2 piezo rods, a joining of the rods into the material is necessary. For a minimization of a damping loss from the piezo material to the aluminium sheet the joining should be done without using any adhesives or intermediate layers ...
www.comsol.com/paper/8702

Studies of Lead Free Piezo-Electric Materials Based Ultrasonic MEMS Model for Bio sensor

This paper describes the design of an ultrasonic transducer using different lead free piezo-electric materials and evaluates their performance with different glucose levels in the human blood. COMSOL Multiphysics ...). These piezoelectric materials are capable of being used as thin films. The potential of 10 Volt with 140 KHz frequency was applied to the device.The ultrasonic transducer with these piezo materials was observed showing different transducer response to different blood density and therefore, it can be used to measure the glucose levels in human blood. ...
www.comsol.com/paper/13595

High-Intensity Piezo-Ceramic Ultrasonic Transducer with Mechanical Amplifier and Radiation Plate

A COMSOL Multiphysics® model was made to design a mechanical amplifier and radiation plate for the emission of high intensity 40.5 kHz ultrasound to air by means of a Langevin type transducer usually applied in cleaning baths for example. In this work, ultrasonic irradiation is aimed at acting on flue gas containing fine particulate matter to realize a shift to higher effective particle sizes as a result of induced ...
www.comsol.com/paper/14538

COMSOL-Based Numerical Analysis of The Electric Field Distribution During Electrospinning and Piezo-response Imaging of Ultra-Fine Lead Zirconate Titanate Fibers

In this paper, we present our results on synthesizing micro and nanoscopic lead zirconate titanate (PZT) fibers using electrospinning. Furthermore, the PZT fibers have been characterized using the piezo-response imaging (PRI ...
www.comsol.com/paper/3186

Piezotyres

Access to electricity has become a major problem. In the process of solving this problem we should consider even a small source of electricity. Piezotyres are made to produce electricity from vehicle tyres. For this we have used a piezoelectric property, one of the natural wonder. COMSOL Multiphysics® was used to design and simulate it virtually. We have used different materials in the software for designing. We su ...
www.comsol.com/paper/15327

Modeling of Vibrating Atomic Force Microscope´s Cantilever within Different Frames of Reference

Cantilever vibration modes were simulated with COMSOL Multiphysics. In the 1st approach the model consisted of an excitation piezo, a holder plate and a chip where the cantilever was mounted on. A sinusoidal voltage signal was applied to the piezo in the simulation, which resulted in movements of the holder plate and finally led to the excitation of the cantilever. In the 2nd ...
www.comsol.com/paper/5319

Characterization of a Tonpilz Transducer and Performance Analysis for a MEMS-Transducer Array

In this paper, we develop and analyze a standard piezoacoustic Tonpilz-transducer model for underwater acoustics in Comsol by addressing the attendant piezoelectric and pressure acoustic multiphysics phenomena. Transducer properties that are studied and characterized are the center frequency, bandwidth, linearity, sensitivity, and noise figure. In an effort to miniaturize the transducer, a functionally similar bu ...
www.comsol.com/paper/11512

Simulation of Nuclear Radiation based Energy Harvesting Device using Piezoelectric Transducer

MEMS(Microelectromechanical systems) based energy harvesting is process of extracting energy from natural resources in small amounts. Here, number of (millions) small energy harvesting modules lead to substancial energy. In this design, a piezoelectric material is used to scavenge energy from natural resources like radioactive source. COMSOL Multiphysics is used to model and simulate a microcantilever with a laye ...
www.comsol.com/paper/11454

Simulation of DC Current Sensor

A proximity DC current sensor using of a piezo sensed and actuated cantilever beam with a permanent magnet mounted at its free end is designed and simulated in COMSOL Multiphysics. The change in resonant frequency of cantilever is a measure of the current through the wire ...
www.comsol.com/paper/9170

Beam Characteristics of Ultrasonic Transducers for Underwater Marine Use

This paper illustrates how finite element analysis with COMSOL Multiphysics can be used to simulate the mechanical and electrical characteristics of piezoelectric transducers. It also shows how beam transmit plots and performance measurements can be modeled by coupling between a piezo domain and a second domain governed by the wave equation. ...
www.comsol.com/paper/1508

Simulation of Acoustic Energy Harvesting Using Piezoelectric Plates in a Quarter-Wavelength Straight-Tube Resonator

An acoustic energy harvesting mechanism at low frequency (~200 Hz) using lead zirconate titanate (PZT) piezoelectric cantilever plates placed inside a quarter-wavelength straight-tube resonator has been studied using COMSOL Multiphysics 4.3 and compared with experimental data. When the tube resonator is excited by an incident wave at its acoustic eigenfrequency, an amplified acoustic resonant wave inside the tube dr ...
www.comsol.com/paper/13717

A Low Cost CMOS Compatible MEMS based Fingerprint Sensor Design

In this paper, a novel design of a fingerprint sensor composed of a 2D array of piezo resistive micro beams has been presented. When the user presses the sensor array with a finger, the ridges and valleys that compose the fingerprint induce corresponding deflections in the micro beams ...
www.comsol.com/paper/13910

Numerical approach of film thickness and friction in EHL by F.E.M.

Hydrodynamic lubrication applies when two moving solids are separated by a lubricant film in which significant pressure occurs. Elastohydrodynamic lubrication (EHL) prevails if the pressure is high enough to elastically deform the solid surfaces. The hydrodynamic pressure is given by the Reynolds equation. This equation is derived from the Navier-Stockes relationships with the following assumptions: *Film thic ...
www.comsol.com/paper/1224

Active Control of a Smart Structure using PID Controller

Smart structures can sense responses and adapt to satisfy specified objectives. The objective of this study is to control the vibrations of the beam subjected to external dynamic forces. The composite beam consists of a layer of aluminum sandwiched between two layers of steel. The beam is fixed at one end and free at the other. The actuator is a piezoelectric device embedded in the aluminum layer. A Proportional Inte ...
www.comsol.com/paper/15289

Modelling AVO signals from laboratory acoustics and seismic (MASLAS)

The Amplitude vs. Offset (AVO) technique infers the elastic properties of geological targets from pre-stack seismic data. AVO analysis significantly reduces the drilling risks for oil and gas exploration and development, particularly in the Gulf of Mexico. One strand of the current, EC-funded ADEMA Project is to evaluate AVO in coal-bearing strata. The target application areas are long-wall extraction in ...
www.comsol.com/paper/2628

Modeling of III-Nitride Quantum Wells with Arbitrary Crystallographic Orientation for Nitride-Based Photonics

modifications of the band structure, spontaneous- and piezo-polarization fields, background layer doping, and variable level of charge carrier injection. Calculated optical characteristics include electron-hole optical susceptibility, spontaneous and stimulated emission rates, polarization coefficients for light emission and absorption, radiative ...
www.comsol.com/paper/5472

Innovating New Products using Multiphysics Modeling

Dr. Shekhawat is currently the General Manager for New Products Development at Secure Meters Ltd., Udaipur. Prior to this, he was with CEERI, Pilani for 23 years. He has a Ph.D., MS, M. Sc. (Physics) and BE (EEE) from BITS, Pilani. He is the recipient of several honours including the DAAD Fellowship, Germany and National Science Talent Fellowship. His areas of research include Ultrasonic Transducers and Flow Measurem ...
www.comsol.com/paper/14185