Vibration and radiated noise estimation of an induction motor by using modal expansion method

Changju Hwang; Wangki Seo; Kyungjun Song

doi:10.7776/ASK.2026.45.3.247

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2026 Vol.45, Issue 3 Preview Page Next Page

Vibration and radiated noise estimation of an induction motor by using modal expansion method 모드 확장법을 이용한 유도 전동기의 진동 및 방사소음 예측

31 May 2026. pp. 247-258

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Abstract

This study proposes and validates a Modal Expansion Method (MEM) based prediction approach for estimating the vibration and radiated noise characteristics of an induction motor under operating conditions. The proposed method combines experimentally measured vibration responses with a finite element model. Experimental Modal Analysis (EMA) was first conducted to identify reliable structural modes, and the finite element model was validated by comparing experimental and numerical mode shapes using the Modal Assurance Criterion (MAC). The selected mode shapes and Operational Deflection Shape (ODS) data measured during motor operation were then used to estimate the Modal Participation Factor (MPF) from measured acceleration responses. Using the estimated modal contributions, the vibration response over the entire motor surface, including unmeasured regions, was reconstructed. The reconstructed surface vibration field was applied as an acoustic excitation source in a finite element–based structural·acoustic coupled analysis to predict the radiated noise. Finally, the predicted vibration and noise results were compared with experimental measurements to verify the accuracy of the proposed method. The results indicate that the MEM-based approach can effectively predict the vibration and radiated noise of an operating induction motor and can be used as a quantitative tool for low-vibration and low-noise motor design.

Keywords

Modal Expansion Method (MEM)

Modal Assurance Criterion (MAC)

Operational Deflection Shape (ODS)

Finite Element Method (FEM)

Vibro·acoustic coupled analysis

본 연구에서는 운전 중인 유도 전동기의 진동 및 방사소음 특성을 규명하기 위해, 실험 데이터와 해석 모델을 결합한 모드 확장법(Modal Expansion Method, MEM) 기반의 예측 기법을 제안하고 그 유효성을 검증하였다. 먼저, 신뢰성 있는 모드 선정을 위해 실험 모드 해석을 수행하였으며, 실험과 해석 간의 모드 상관 계수(Modal Assurance Criterion, MAC) 비교를 통해 해석 모델의 타당성을 검토하였다. 이후, 선정된 모드 형상과 운전 변형 형상(Operational Deflection Shape, ODS)을 활용한 계측 가속도로부터 각 절점의 기여도를 산정하였고, 이를 바탕으로 미계측 지점을 포함한 전동기 표면 전체의 진동 거동을 예측하였다. 예측된 진동장을 음원으로 적용하여 유한요소법(Finite Element Method, FEM) 기반 구조·음향 연성 해석을 수행하였으며, 이를 통해 방사소음을 예측하였다. 최종적으로 예측과 실험 결과 간의 상관성 분석을 통해 제안한 기법의 정확성을 검증하였다. 본 연구 결과는 유도 전동기의 저진동·저소음 설계를 위한 정량적 설계 기반 자료로 활용될 수 있을 것으로 기대된다.

키워드

모드 확장법(Modal Assurance Criterion, MAC)

모드 상관 계수(Modal Assurance Criterion, MAC)

운전 변형 형상(Operational Deflection Shape, ODS)

유한요소법(Finite Element Method, FEM)

구조·음향 연성 해석

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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 :3
Pages :247-258
Received Date : 2026-03-09
Revised Date : 2026-05-06
Accepted Date : 2026-05-19
DOI :https://doi.org/10.7776/ASK.2026.45.3.247

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

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