Characterization of fluid-borne vibration and radiated noise due to unsteady compressible flow in a pressure relief valve of an air suspension system

Yonguk Lee; Kwongi Lee; Cheolung Cheong; Janghyun Oh; Bongkeun Choi

doi:10.7776/ASK.2026.45.2.195

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2026 Vol.45, Issue 2 Preview Page Next Page

Research Article

Characterization of fluid-borne vibration and radiated noise due to unsteady compressible flow in a pressure relief valve of an air suspension system 전자식 에어 서스펜션 압력방출밸브의 비정상 압축성 유동에 의한 유체기인 진동 및 방사소음 특성분석

31 March 2026. pp. 195-206

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Abstract

As vehicle electrification enhances the demand for quietness, the Noise, Vibration, and Harshness (NVH) performance of Pressure Relief Valves (PRV) in air suspension systems has become critical. This study develops an integrated flow-vibroacoustic analysis framework to predict Fluid-Borne Vibration (FBV) and radiated noise induced by unsteady compressible flow inside a PRV. Wall-pressure fluctuations are computed using 3D unsteady compressible Large Eddy Simulation (LES) and mapped onto a structural model for frequency-response and structural-acoustic coupled analysis. Short-Time Fourier Transform (STFT) is employed to characterize the time-varying spectral features of the discharge process. The predicted acceleration and sound pressure spectra show good agreement with experimental data, specifically capturing the broadband and quasi-tonal components during the initial transient phase. The proposed framework provides an effective tool for predicting and optimizing the NVH performance of electronic air suspension systems at the early design stage.

Keywords

Air suspension

Pressure Relief Valve (PRV)

Fluid-Borne Vibration (FBV)

Flow noise

Flow-Vibration-Acoustic Coupled Analysis

차량 전동화로 인한 정숙성 요구 증대에 따라 전자식 에어 서스펜션 압력방출밸브(Pressure Relief Valve, PRV)의 소음·진동·불쾌감(Noise, Vibration, and Harshness, NVH) 성능 확보가 중요해지고 있다. 본 연구에서는 PRV 내부의 비정상 압축성 유동에 의한 유체기인 진동(Fluid-Borne Vibration, FBV) 및 방사 소음을 예측하기 위해 Large Eddy Simulation(LES) 기반의 유동–진동–음향 통합 해석 프레임워크를 구축하였다. 3차원 비정상 압축성 유동 해석을 통해 벽면 압력 섭동을 산출하였으며, 이를 구조 해석 모델에 매핑하여 주파수 응답 기반의 진동 및 구조–음향 연성 해석을 수행하였다. 또한, Short-Time Fourier Transform(STFT) 분석을 도입하여 배기 과정의 시간 가변적 특성과 과도 구간의 스펙트럼 특성을 규명하였다. 해석 결과는 실험 데이터와 양호한 일치를 보였으며, 특히 초기 배기 시 발생하는 광대역 및 준순음성 성분을 효과적으로 재현하였다. 본 연구에서 제안한 통합 해석 기법은 설계 초기 단계에서 PRV의 NVH 성능을 사전 예측하고 최적화하는 데 유용하게 활용될 것으로 기대된다.

키워드

에어 서스펜션

압력방출밸브(Pressure Relief Valve, PRV)

유체기인 진동(Fluid-Borne Vibration, FBV)

유동소음

유동–진동–음향 연성해석

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 45
No :2
Pages :195-206
Received Date : 2026-02-27
Revised Date : 2026-03-20
Accepted Date : 2026-03-26
DOI :https://doi.org/10.7776/ASK.2026.45.2.195

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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