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.

Harvesting Wind Energy for Microid Microrobots

J. Clark, F. Li, S. Naidu, R. Sahu, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we numerically investigate the feasibility of microids to harvest energy from the wind using the piezoelectric effect to recharge its energy supply. Microids are a particular subset of microrobots that have insect-like dexterity. In order for microids to function autonomously long-term outdoors, it is advantageous for them to be able to extract renewable energy from the environment. ...

Verifying the Measurement of Force, Displacement, and Stiffness of MEMS Using Electro Micro Metrology Through Nonideal Simulated Experiments

G. Campos[1], and J.V. Clark[2]
[1]Purdue University, Calumet, IN, USA,
[2]Purdue University, West Lafayette, IN, USA

In this paper we verify the measurement of force, displacement, and stiffness of micro electro mechanical systems (MEMS) using electro micro metrology (EMM) through nonideal simulated experiments in COMSOL. EMM is a metrological technique used to extract micro scale mechanical properties solely in terms of electrical measurands such as capacitance, voltage, or frequency. EMM uniquely facilitates ...

MEMS Scanning Probe with Three Degrees of Freedom

C. Hamm[1], and J.V. Clark[2]
[1]University of Portland, Portland, OR, USA,
[2]Purdue University, West Lafayette, IN, USA

In this paper, we present a computational study of a novel micro-electro-mechanical system (MEMS) scanning probe with three degrees of freedom (DOF). Such a probe is expected to be beneficial for nano and biotechnology research. For the past two decades, the atomic force microscope (AFM) has been successfully used in probing nanoscale phenomena. However, the accuracy of the AFM is unknown, it has ...

Gating of Gigantic Ionic Current through Single-Walled Carbon Nanotubes

P. Krstic, and J. Park
Oak Ridge National Laboratory
Oak Ridge, TN

The gigantic magnitude features of the ionic current of electrolyte through carbon nanotubes (CNT) are explained by the dramatic increase of electroosmotic current induced by the strong slip at the CNT surface and the considerable excess volume charge inside the tube. In this study, we investigate the fundamental details of gating phenomena of such gigantic ionic current through CNT by using ...

Optimization of the Design Parameters of a Piezoelectric Actuator

G. Srivastava[1], R. Sharma[1], A. Goswami[2], A. Phani[2], and R. K. Dwivedi[1]
[1]Jaypee Institute of Information Technology, India
[2]Indian Institute of Science, India

In this work a cantilever beam has been chosen as the element of study, consisting of a piezoelectric polymer like PVDF with a thin permalloy layer coating on one side of it. This piezoelectric cantilever is designed using COMSOL software. It is seen that the deflection of the tip of a unimorph cantilever is dependent on its geometric dimension, type of material and the applied field. Hence in ...

Design of a RF MEMS Switch

B. Mishra, M. P. S. Naidu, J. Raj, and Z. C. Alex
VIT University
Tamilnadu, India

This paper presents a novel design of a RF MEMS Switch. The switch is a capacitive type, which is actuated by an electrostatic force. The structure of the switch consists of a CPW (coplanar waveguides) transmission lines and a suspended membrane. The modelling of switch is done using COMSOL software and RF characteristics is found out by using CST software.

2D Simulation of Cardiac Tissue - new

S. Esfahani[1]
[1]University of South Florida, Tampa, FL, USA

A two-dimensional atrial tissue model has been constructed in COMSOL Multiphysics® software to study the propagation of action potential and electrograms. The model presents the atrial electrograms recorded with a mapping catheter. A 2D atrial tissue model is simulated using the Courtemanche et al. cell model equations. PDE in coefficient form was used in COMSOL Multiphysics® to reproduce ...

Modeling of Directional Dependence in Nanowire Flow Sensor - new

A. Piyadasa[1,3], P. Gao[1,2,3]
[1]Department of Physics, University of Connecticut, Storrs, CT, USA
[2]Department of Materials Science & Engineering, University of Connecticut, Storrs, CT, USA
[3]Institute of Materials Sciences, University of Connecticut, Storrs, CT, USA

3D finite element analysis model has been constructed for testing the directional dependence in a novel form of nanowire array gas flow sensor. Single nanowire (p-type single crystal Silicon) model is developed using fluid structure interaction and piezoresistivity components in the MEMS Module for COMSOL Multiphysics® software. Change in resistivity tensor due to induced stress in the nanowire ...

High Frequency Resonators Using Exotic Nanomaterials - new

B. Panchapakesan[1], M. Loeian[1]
[1]Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA

Human made mechanical resonators have been around for a thousand years. Early applications included musical instruments and chronographs operating in millihertz to kilohertz frequencies while more recent interest has turned ultra-high frequency resonators and oscillators suitable for wireless technologies, mass sensing and even biological applications. The trend has been towards small, stiff and ...

AC Electrothermal Characterization of Doped-Si Heated Microcantilevers Using Frequency-Domain Finite Element Analysis - new

K. Park[1], S. Hamian[1], A. M. Gauffreau[2], T. Walsh[2]
[1]Mechanical Engineering Department, University of Utah, Salt Lake City, UT, USA
[2]Department of Mechanical, Industrial & Systems Engineering, University of Rhode Island, Kingston, RI, USA

This work investigates the frequency-dependent electrothermal behaviors of freestanding doped-silicon heated microcantilever probes operating under the periodic (ac) Joule heating. The transient heat conduction equation for each component (i.e., the low-doped heater region, the high-doped constriction region, and the high-doped leg region) is solved using the general heat transfer module for DC ...

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