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Title
[BK21 seminar] 7th June(Tue) Prof. Chang-Dong Yeo(Texas Tech University) "Impacts of Structural Vibration and Electrode’
Date
2022.05.30
Writer
기계공학부
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Please give a lot of attention and participation from the members of the Mechanical Engineering department.


▣ Title:Impacts of Structural Vibration and Electrode’ Surface Roughness on Electrical Contact Resistance

▣ Speaker:Prof. Chang-Dong Yeo

▣ Affiliation: Texas Tech University, USA

Date: 2022. 6. 7.(Tue) 13:00

Venue: 제4공학관 D604호

Host: 김대은 교수

▣ Abstract

There is a critical need for a high performing and durable electric connector in traditional and emerging technology sectors. For example, electric vehicles (EVs), missile/rocket, aircrafts, and space shuttles are equipped with numerous and diverse types of electrical connectors, which are required to operate under vigorous vibration, mechanical stress, and a wide range of temperature. Under such harsh operating environments, electrical connectors can experience a sudden increase of electrical contact resistance (ECR), which can lead to a critical ohmic loss and a fatal surface damage. Therefore, the actual and correct analysis of ECR, if possible, can provide an innovative breakthrough on the design of electrical connectors. In this study, an integrated multi-physics ECR model is developed to obtain the fundamental mechanism of rough electrode’s dynamic ECR response. To accommodate the effects of structural vibration on the ECR response, a nonlinear system dynamics is coupled with the rough surface contact model and the ECR equation. The impacts of structural properties (stiffness and damping) and surface roughness on the ECR is investigated through the parametric simulations and statistical data analysis. Lastly, using the novel density-function-theory (DFT) techniques, thermoelectrical properties of metal oxides are calculated with respect to strain and temperature, which can improve the quality and accuracy of the proposed ECR model.


Attachments
20220607_BK21_여창동 교수(김대은 교수님).jpg