Artigos Técnicos e Apresentações

Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abramgem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

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 ...

Exploring the Design Space of Electro Thermal Actuators

W. Hodges, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we explore the design space of several configurations of electro thermal actuators (ETA) through COMSOL. A unique attribute of ETA is their ability to produce a large and stable actuation force using any semi-conductive material. Comparisons between ETAs are lacking. Without adequate comparisons, it is difficult for designers to readily decide which type and geometry of ETAs might ...

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 ...

Patient-specific Modelling of Blood-flow in Cerebral Aneurysms

D. Zajarias-Fainsod[1], M.J. Chappell[1], J.F. Collingwood[1], A. Rennie[2], S. Nagaraja[2], and A. Wilson[2]
[1]University of Warwick, Coventry, UK,
[2]University Hospital Coventry and Warwickshire NHS Trust, Coventry, UK

A first stage in this research was to determine the feasibility of patient-specific modelling and the use of in-silico techniques to study flow for the first time in the same vessels with and without an aneurysm. Three-dimensional renderings of the cerebral blood vessels were reconstructed from computed tomography angiograms of the head using MATLAB (The MathWorks) for image processing and ...

Dielectric Stress and Coordination Study in the PAB72 High Voltage Circuit Breaker Interrupter

D. Andrade, and D. Schiffabuer
Pennsylvania Breaker LLC, Canonsburg, PA, USA

Pennsylvania Breaker presents a dielectric stress study for its 72kV class breaker. This study was instrumental in the design and testing procedures during the research and development phase. COMSOL was incorporated into the design pipeline as an important tool for rapid reference of complicated and costly steady state electric cases. The purpose of this study was to develop a robust geometric ...

Understanding of How Megathrust Earthquakes Affect Volcanoes

Youichiro TAKADA[1]
[1]Kyoto University, Kyoto, Kyoto, Japan

Several volcanic regions in the northeastern Honshu locally subsided in response to the crustal deformation associated with the 2011 Mw 9.0 Tohoku earthquake. High temperature rocks are distributed at shallow depths under these volcanic regions, and we interpret that the localized deformation of such hot regions due to the earthquake fault rupture caused the subsidence. We applied COMSOL ...

Optimization of Post-Heat Treatment for Doping of Metal Oxide Particles

P. Widiatmoko et al.[1]

[1]Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan

Liquid-to-solid route for preparing a doped metal oxide (powder) shows advantage on the homogeneity of the precursor as well as the product. Heat treatment plays important role in the process where the salt of precursor in the liquid reacts to form metal oxide solid particles. Understanding the effect of heat treatment in the doping process will then give great advantages. In the present study, ...

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