Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Design and Simulation of Piezoelectric Ultrasonic Micro Motor

P. Patel[1], P. Manohar[1]
[1]Electrical and Electronics Department, M. S. Ramaiah Institute of Technology, Bangalore, Karnataka, India

Micro machined motors are a recent development in the domain of electrical machines. Compared to the conventional electromagnetic motors, micro machined motors offer high torque at lower speed, and are compact in nature. This makes them suitable for applications in the field of microsatellite, biomedical, micro robot, automobile, and auto focusing camera. The present work describes the design and ...

A Computational Approach for Simulating p-Type Silicon Piezoresistor Using Four Point Bending Setup

T.H. Tan[1], S.J.N. Mitchell[1], D.W. McNeill[1], H. Wadsworth[2], S. Strahan[2]
[1]Queen's University Belfast, Belfast, United Kingdom
[2]Schrader Electronics Ltd, Antrim, United Kingdom

The piezoresistance effect is defined as change in resistance due to applied stress. Silicon has a relatively large piezoresistance effect which has been known since 1954. A four point bending setup is proposed and designed to analyze the piezoresistance effect in p-type silicon. This setup is used to apply uniform and uniaxial stress along the crystal direction. The main aim of this work is to ...

CFD-based Evaluation of Drag Force on a Sphere Unsteadily Moving Perpendicularly toward a Solid Surface: a Simple Model of a Biological Spring, Vorticella Convallaria

S. Ryu[1], and P. Matsudaira[2]
[1]Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
[2]Department of Biology and Bioengineering, Massachusetts Institute of Technology, Cambridge, MA, USA

Vorticella convallaria, a sessile peritrich ciliate having a contractile stalk, is regarded as a model biological spring because of its remarkably fast contraction. Because the cell body shrinks to sphere-like shape during contractions, it can be assumed to be a sphere moving in quiescent water, and Vorticella’s contraction force has been evaluated with Stokes’ law. In this study, we ...

Multiphysics Simulation of a Self-heating Paraffin Membrane Microactuator

P. Lazarou[1], C. Rotinat[1]
[1]CEA LIST/DIASI/LRI, Paris, France

A grand variety of microactuator technologies and demonstrators has been introduced during the last years. Of particular interest are the microactuators based on phase change materials and especially paraffin wax, which can volumetrically expand up to 15%, providing high force actuation. The object of this study is the numerical validation of a paraffin microactuator concept by coupling multiple ...

Harmonic Simulation of Viscoelastic Polymer Microcantilever for Electrostrictive Energy Harvesters

N. Alcheikh[1], C. Ayela[1], I. Dufour[1]
[1]Univ. Bordeaux, IMS Lab, Pessac, France.

Electrostrictive polymers have been of significant interest over the last years for energy harvesting. Principle is based on the conversion of a mechanical deformation into electricity. The stored energy basically depends on the mechanical strain induced into an electrostrictive polymer by the mechanical resonant vibration of a microcantilever supporting the electrostrictive layer. In this work, ...

Degeneracy Breaking, Modal Symmetry and MEMS Biosensors

H.T.D. Grigg[1], T.H. Hanley[1], B.J. Gallacher[1]
[1]Newcastle University, Newcastle upon Tyne, United Kingdom

This work is concerned with systems possessing cyclic symmetries. In particular, we concentrate on the case in which the medium possesses infinite order cyclic symmetry, while the constitutive relations have cyclic symmetry of a lower order. We investigate the interactions between modes with cyclic symmetry of order n and geometries with underlying cyclic symmetry of order M. Rayleigh's ...

Design and Simulation of 3D ZnO Nanowire Based Gas Sensors for Conductivity Studies

N. Gouthami, D. Parthiban, M. Alagappan, and G. Anju
PSG College of Technology
Tamil Nadu, India

The objective of this paper is to design a 3D Gas Sensor for sensing Hydrogen gas and to increase the conductivity at nano level. In this novel design, nanorods act as the sensing layer. The sensitivity towards gas adsorption is found to be increased due to its high surface to volume ratio. The total displacement and voltage on intermediate layer after gas adsorption will be changing by varying ...

3-D Finite Element Modeling of a Nanostructure Enhanced SAW Sensor

Y.L. Rao[1], and G. Zhang[1-3]
[1] Micro/Nano Bioengineering Laboratory, Department of Biological and Agricultural Engineering, The University of Georgia
[2] Nanoscale Science and Engineering Center, The University of Georgia
[3] Faculty of Engineering, The University of Georgia

Integration of surface acoustic wave (SAW) devices with nanostructures has gained interest in the development of sensors with high sensitivity. To better design nanostructure integrated SAW devices, it is essential to model three dimensional (3-D) SAW devices and analyze the wave propagation characteristics in nanostructure-enhanced SAW devices. In this work, a 3-D finite element model of ...

Design of Pressure Measuring Cells Using the Unified Material Law

P. Aguirre[1], F. Figueroa[1]
[1]Sensor Technik Wiedemann GmbH, Kaufbeuren, Bayern, Germany

Pressure Sensors are widely used in the automotive industry. Their main use is the dynamic monitoring of pressure inside combustion engines. To achieve a good signal accuracy, the design of pressure sensors can be improved with FEM calculations of stress and strains on the measuring cell depending on their geometry and material properties. The geometry is adapted according to a special ...

Finite Element Analysis of BAW Sensor

M. Hashiguchi[1], Y. Sumiyoshi[1]
[1]Keisoku Engineering System Co., Ltd., Tokyo, Japan

Achieving passive device working over two GHz bands for next generation mobile phone has been strongly desired. This paper investigated the spurious mode suppression for the BAW resonator. The border-frame technique which has been proposed in many literatures is examined here numerically. It was found that the present finite-element analysis using COMSOL Multiphyiscs® was validated via ...

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