Technical Papers and Presentations

Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Predicting the Mechanical Properties of Biological Inspired Diatoms

M.F.D. Moreno, L.P. Davila, and F. Viscarra
University of California at Merced, Merced, CA, USA

Our computational work has focused on calculating the mechanical properties of diatom silica structures using COMSOL Multiphysics. We have used selected diatom geometries based on their structure classification and different loading conditions. Various 3D structures were modeled on Pro/ENGINEER, and then exported to COMSOL for further analysis. The mechanical behavior of diatom structures was ...

Electrochemical Modeling of Passive Film Formation on Steel in Simulated Concrete Pore Solutions

H.M. Bernardes[1], M. Mancio[2], and P.J.M. Monteiro[2]
[1]São Paulo State University, Ilha Solteira, SP, Brazil
[2]University of California, Berkeley, CA, USA

In this work, a tridimensional model of the electrochemical reactions taking place on the alloy/solution interface has been developed in the COMSOL Multiphysics environment. The model accounts for solution chemistry, cell potential, and solves the related mass, momentum and energy balances. The simulation is based mainly on the experimental results obtained by Mancio et al, which have employed ...

Response of Structures to Transient Loading

R.D. Costley, H. Diaz-Alvarez, and M.H. McKenna
U.S. Army Corps of Engineers, Washington, DC, USA

Large infrastructure, such as bridges, emits signals at their natural or driven frequencies of vibration, providing an indication of the structural condition that can be monitored without a need to physically touch the structure. In this presentation, a benchmark case for the transient excitation of a simple structure is investigated: the COMSOL and analytical solutions are compared for the ...

Increasing the Robustness of a Linear Transduction Pressure Sensor for Post-Processing Assembly

A. Dhawan[1], F. Li[1], A.G. Akingba[2], and J.V. Clark[1]

[1]Purdue University, West Lafayette, IN, USA
[2]Indiana University, Indianapolis, IN, USA

In this paper we numerically explore design variations to increase the resistance to rotation of our novel large-deflection, linear-transduction pressure sensor to increase its expected yield for post-processing assembly and misalignment. During post processing assembly, a diaphragm is anodically bonded to the base which contains comb drives. Once the diaphragm is in contact with the comb drive, ...

Piezoelectric Micromanipulator with Multiple Degrees of Freedom

J. Clark, O. Shukla, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we model and simulate a novel piezoelectric micromanipulator with multiple degrees of freedom with COMSOL. Micromanipulation is useful for micro and nanoscale assembly and manipulation in a variety of science and engineering areas. And the applications of micromanipulation increases with the number of degrees of freedom. Previous micromanipulation efforts used electro thermal or ...

Design and Simulation of Flying Microids

J. Clark, F. Li, B. Khandagale, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we present the first design and simulation results of flying microids. Microids are a particular type of microrobots that have insect-like dexterity. Our initial investigation into the ability of microids to walk, run, jump, turn, carry loads, and walk upside-down was previously presented. Having the ability to fly greatly extends transportability. Although others have previously ...

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 ...

Reducing Mitigating Factors That Lead to Clotting of the Arteries From Prolonged Hemodialysis

K. Hegde[1], J. Clark[1], A.G. Akingba[2], and J.V. Clark[1]
[1]Purdue University, West Lafayette, IN, USA,
[2]Indiana University, Indianapolis, IN, USA

In this paper we present a computational study of our novel arteriovenous (AV)-shunt interface device that is expected to reduce the mitigating factors that lead to clotting of the AV-shunts from prolonged hemodialysis. Kidney failure affects about 300,000 (about 0.1%) of the United States population. About 20% of the hemodialysis hospitalizations in the U.S. are due to clotting-related vascular ...

Harvesting Thermal Energy for Microid Microrobots

A. Shankar, F. Li, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we present a computational study on harvesting thermal energy to electrically recharge microid microrobots. Microids are microrobots that have insect like dexterity. We examine the feasibility of extracting energy from the ambient environment through the piezoelectric legs of the microid. The microid’s use in remote locations makes it imperative for it to be able to recharge ...

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