한국소음진동공학회:학술대회논문집 (Proceedings of the Korean Society for Noise and Vibration Engineering Conference)
- 한국소음진동공학회 2006년도 추계학술대회논문집
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- Pages.607-611
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- 2006
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- 1598-2548(pISSN)
구조 방사 소음의 해석을 위한 구조물의 진동 획득 방법의 비교
Comparison of various methods to obtain structural vibration for vibro-acoustic noise
-
왕세명
(광주과학기술원 기전공학과) ;
-
신민철
(광주과학기술원 기전공학과) ;
- 구건모 (광주과학기술원 기전공학과) ;
- 김대성 (광주과학기술원 기전공학과) ;
- 배원기 (광주과학기술원 기전공학과) ;
- 경용수 (광주과학기술원 기전공학과) ;
- 김정선 (광주과학기술원 기전공학과) ;
- 국정환 (광주과학기술원 기전공학과) ;
-
Wang Se-Myung
;
-
Shin Min-Cheol
;
- Koo Kun-Mo ;
- Kim Dae-Sung ;
- Bae Won-Ki ;
- Kyong Yong-Soo ;
- Kim Jung-Seon ;
- Kook Jung-Hwan ;
- Thuy Tran ho Vihn
- 발행 : 2006.11.16
초록
There are several methods to obtain structural vibration for analysis of vibro-acoustic noise. First of all, vibration data can be obtained through the structural analysis using finite element method. Although this method has no need to experiment, the analysis result is unreliable when the structure and the vibration source is complex to model exactly. The second method is to measure vibration using a number of sensors. The analyzed vibro-acoustic noise with directly measured data is setting morereliable when the number of data acquisition points is getting larger. However, it requires large amount of time and effort to measure all vibration data on every node especially when the size of vibrating structure is large. The Modal Expansion Method(MEM), which uses mode information and measurement data, has been introduced to compensate their limits. With a relatively small number of measurement data, the reliable structural vibration for vibro-acoustic noise can be obtained using this semi-analysis method. Although MEM gives reliable result, it is restricted by the number of modes and measurement points. In this paper, structural analysis, direct vibration measurement method and MEM are compared using the simple aluminum box model. Furthermore, the washing machine case is also provided as a comparative example. The Laser Doppler Vibrometer(LDV) was used instead of contact type accelerometer to get vibration data.
키워드