Sound Generation by Metro Trains during Braking and Its Suppression Method

S. G. Suchkov; Сучков С. Г.; V. Ya. Yavchunovsky; Явчуновский В. Я.; A. I. Timofeev; Тимофеев А. И.; V. A. Nikolaevtsev; Николаевцев В. А.; D. S. Suchkov; Сучков Д. С.; V. V. Tretinnikov; Третинников В. В.

doi:10.31857/S0320791923600191

Sound Generation by Metro Trains during Braking and Its Suppression Method

Authors: Suchkov S.G.¹, Yavchunovsky V.Y.², Timofeev A.I.², Nikolaevtsev V.A.¹, Suchkov D.S.¹, Tretinnikov V.V.²
Affiliations:
1. Saratov State University, 410012, Saratov, Russia
2. SPC Etna Plus, 410040, Saratov, Russia
Issue: Vol 69, No 3 (2023)
Pages: 367-373
Section: АКУСТИЧЕСКАЯ ЭКОЛОГИЯ. ШУМЫ И ВИБРАЦИЯ
URL: https://journals.rcsi.science/0320-7919/article/view/134446
DOI: https://doi.org/10.31857/S0320791923600191
EDN: https://elibrary.ru/QRSQLX
ID: 134446

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Abstract
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Abstract

The causes of acoustic noise occurring during braking of electric vehicles, in particular, in the metro, were analyzed. The spectrum of such noise was measured, and it is shown that high-frequency discrete tones are excited by braking resistors, applied for electrodynamic braking of electric vehicles. Three proposed mechanisms of electromechanical interaction in a Fecral plate, which is a braking resistor element, were considered: the Ampère force and linear and nonlinear magnetostriction. It was shown that predominant odd harmonics indicate the presence of a significant piezomagnetic effect and the inverse effect of linear magnetostriction in the Fecral alloy. A phenomenological approach was used to calculate the piezomagnetic tensor elements for Fecral. Calculations by the finite element method showed that asymmetric cuts introduced into the plate may significantly decrease intensity of acoustic vibrations excited by the braking resistor.

Keywords

braking resistor, acoustic noise, piezomagnetic effect, magnetostriction, Ampère force, Fecral

References

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