역 행렬 계산을 이용한 실 소음원의 모델링

Acoustic Source Modeling by Using ISC(Inverse Source Calculation)

  • 최재웅 (삼성중공업 중앙연구소 E-CIM 센터) ;
  • 이희준 (삼성중공업 중앙연구소) ;
  • 강종민 (삼성중공업 중앙연구소 E-CIM 센터) ;
  • 강신일 (삼성중공업 중앙연구소)
  • 발행 : 1998.06.01

초록

The noise sources, structure-borne and/or air-borne, in machinery can be defined by their locations and strengths. However the locations of that noise sources are well known in many cases. In those cases, the problem can be defined as an inverse problem to known the strengths of the noise sources in the frequency domain, the modeling scheme is classified by thecoherent or incoherent source. This paper expands the basic concept to the case of the complex noise sources, in which the set of coherent and incoherent noise sources are matched with the noise of a real vehicle. The error factors in the experiment and the optimal number of the monopole sources to match the real suond filed are also investigated. The results of the noise source modeling of heavy machinery show that the incoherent and coherent/incoherent source models are applicable to the high frequency and the low frequency region, respectively. The noise source model also enables the noise source analysis to rank the contribution of real source group such as engine, T/M, exhuast, etc.

키워드

참고문헌

  1. 한국음향학회하계학술대회논문집 BEM과 SEA의 통합적용에 의한 차량의 방사 소음 예측 강종민;최재웅;이희준;강신일
  2. J. Acoust. Soc. Am. v.78 no.4 Nearfield Acoustic Holography : I. Theory of Generalized Holography and development of NAH Maynard, J.D.;Williams E.G.;Lee Y.
  3. LMS presentation material on ASQ(Airborne Source Quantification)
  4. Technical Review No. 1, B & K Publication STSF-a Unique Technique for Scan-Based Near-Field Acoustic Holography Without Restrictions on Coherence Hald J.