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http://dx.doi.org/10.7776/ASK.2022.41.6.691

Towards reducing acoustical high-frequency noise of a direct current relay via contact structure  

Junhyeok, Yang (Keimyung University)
Jongseob, Won (Jeonju University)
Wonjin, Kim (Keimyung University)
Publication Information
The Journal of the Acoustical Society of Korea / v.41, no.6, 2022 , pp. 691-697 More about this Journal
Abstract
In this work, a straightforward component design of a direct current (DC) relay equipped in electric vehicles is discussed. The work aims to provide and evaluate effective measures for reducing high-frequency sound from the DC relay carrying electric power. From the operation experiments for the relay, it is observed that noise is caused by the resonance from the forced vibration by the electromagnetic repulsive force originating at the area of electric contacts with a resonance frequency of around 710 Hz ~ 730 Hz. A finite element model for the relay was established to conduct vibration mode analysis, consisting of stationary and movable contacts and a contact spring. Vibration mode analysis indicates that in the resonance frequency, the movable contact with two-point contacts experiences rotational vibration mode. For the proposed relay with a three-point contact, vibration mode analyses give reasonable results of reducing noise at that frequency. Furthermore, for the fabricated relays with the three-point contact, similar results have been obtained. In conclusion, one can see that the proposed measures provide one of the feasible solutions to the reduction of relay noise.
Keywords
Acoustic noise; DC relay; High frequency noise; Noise reduction;
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Times Cited By KSCI : 1  (Citation Analysis)
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