Articles techniques et présentations

Recherche rapide

Ressources

Livres Blancs

Voyez comment la modélisation et la simulation sont utilisées par les industries La modélisation et la simulation multiphysiques pilotent l'innovation dans tous les grands secteurs d'activité et dans le monde universitaire — comme en témoignent les nombreuses utilisations présentées dans des articles et des posters techniques présentés par des ingénieurs, chercheurs et scientifiques à la Conférence COMSOL chaque année. Inspirez-vous des récents proceedings réunis ci-dessous, ou, pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt, utilisez la recherche rapide.

Consultez les proceedings de la Conference COMSOL 2024

Terme recherché:

Piezoelectric Devices

Simulation of a New PZT Energy Harvester with a Lower Resonance Frequency Using COMSOL Multiphysics®

H. Elbahr[1], T. Ali[1,2], A. Badawi[1], S. Sedky[1]
[1]Zewail City of Science and Technology - Cairo, Cairo, Egypt
[2]Cairo University, Cairo, Egypt

Energy harvesting from environmental vibration nowadays is feasible because of natural oscillations like that caused by air or liquid flow and by exhalation or the heartbeat of a human body. This vibration frequency is typically low (in order of less than 1 kHz). Accordingly, low ... En savoir plus

Modeling and Simulation of High Sensitivity CMOS Pressure Sensor Using Free Boundary Circular Diaphragm Embedded on Ring Channel Shaped MOSFET

S. Joy[1], T. Tom[1]
[1]Rajagiri School of Engineering and Technology, Kochi, Kerala, India

Sensors have diverse applications ranging from the medical field to space exploration. They convert physical parameters such as temperature, pressure, humidity etc. into an electrical output. The discovery of piezoresistivity property of silicon and germanium led to miniaturization of ... En savoir plus

Simulation of a Piezoelectric Loudspeaker for Hearing Aids and Experimental Validation

G. C. Martins[1], P. R. Nunes[1], J. A. Cordioli[1]
[1]Federal University of Santa Catarina, Florianópolis, SC, Brazil

The use of piezoelectric materials in hearing aid loudspeakers, also called receivers, presents technical and economic advantages such as reducing the number of parts of the system and its manufacturing cost. However, the performance of such systems is still not competitive when compared ... En savoir plus

Understanding Logging-While-Drilling Transducers with COMSOL Multiphysics® Software

R. Jiang[1], L. Mei[1], X. Liu[2], H. Li[2], Q. Zhang[1]
[1]Department of Electrical Engineering, Materials Research Institute, Pennsylvania State University, University Park, PA, USA
[2]Department of Technical Services, China Oilfield Services Limited, Yanshan, Hebei, China

Logging-while-drilling (LWD) acoustic transducers provide real-time data about the geologic and geophysical properties of the borehole that ensure safety margins and optimize completion. It is important to understand what causes the different resonance modes in the transmitter and obtain ... En savoir plus

Long Range Ultrasonic Guided Waves for Pipelines Inspection

Á. Angulo[1], Dr. S. Soua[1]
[1]TWI Ltd, Cambridge, UK

The evaluation of defect size and nature are two most controversial topics in ultrasonic flaw detection. The operation consists of an application of ultrasonic waves to pipes in order to detect metal loss and other defects in the pipe wall due to corrosion and other degradation ... En savoir plus

Simple Disk Piezo Transformer Based Oscillator

J. P. Sandoz[1], J. M. Kissling[1]
[1]Institute of Applied Microtechnology, La Chaux-de-Fonds, HE‐ARC, Switzerland

In this contribution we present a COMSOL Multiphysics® example of a disk piezoelectric ceramic transformer (D-PT) coupled with a bipolar NPN transistor to form an auto-oscillator. The comparison between the simulations and the measurements made on our prototype are found to be in good ... En savoir plus

Finite Element Analysis of Temperature and Viscosity Effects on Resonances in Thin-Film Bulk Acoustic Wave Resonators

G. Rughoobur[1], M. DeMiguel-Ramos[2], L. García-Gancedo[1], M. Clement[2], J. Olivares[2], T. Mirea[2], W. I. Milne[1], E. Iborra[2], A. J. Flewitt[1]
[1]University of Cambridge, Cambridge, UK
[2]Universidad Politécnica de Madrid, Madrid, Spain

The shear mode of film bulk acoustic resonators (FBARs) is preferred to the longitudinal mode owing to its lower acoustic losses in a liquid. However in addition to mass loading, the resonance is also affected by temperature and liquid viscosity. These two parameters can either be sensed ... En savoir plus

Simulation of Cascaded Thermoelectric Devices for Cryogenic Medical Treatment

P. Aliabadi[1], S. Mahmoud[1], R. K. AL-Dadah[1]
[1]Mechanical Engineering Department, University of Birmingham, Birmingham, UK

This study is focused on using a thermoelectric device (TED) as an alternative to the cryogenic liquid for cooling cryosurgical probe used for cancerous tissue ablation. Thermoelectric device, namely Peltier, is a solid state device which converts electric current to thermal gradient. In ... En savoir plus

MEMS Acoustic Pixel

A. Arevalo[1], I. G. Foulds[2]
[1]King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
[2]The University of British Columbia, Vancouver, BC, Canada

A COMSOL Multiphysics® simulation was used to simulate the behavior of a micro-membrane (Acoustic Pixel) to be used as a potential acoustic transducer. The MEMS and Piezoelectric devices interfaces were used to simulate such transducer. A four-cantilever spring configuration is initially ... En savoir plus

Heat Drain Device on Ultrasound Imaging Probe

G. Vigna[1], L. Spicci[1]
[1]Esaote SPA, Florence, Italy

Self-heating is a problem to consider for Ultrasound Imaging probes. Since the probe is in contact with the skin, it’s necessary to find a solution to lower the front face temperature in order to avoid patient discomfort, even at the most demanding operating condition. One solution ... En savoir plus

Premier

141–150 of 153

Dernier