다차원 해석법을 이용한 자동차 공조시스템의 기여도 분석Coherent Analysis of Vehicle HVAC Using the MDSA Method
- Other Titles
- Coherent Analysis of Vehicle HVAC Using the MDSA Method
- Authors
- 오재응; 황동건; 아미누딘; 이정윤; 김성수
- Issue Date
- Aug-2005
- Publisher
- 한국정밀공학회
- Keywords
- 다차원 해석법; 공조시스템; 부분기여도함수; 다중기여도함수; 기여도분석; Multi-dimensional spectrum analysis; HVAC; Partial coherence function; Multiple coherence function; Coherent-analysis
- Citation
- 한국정밀공학회지, v.22, no.8, pp.143 - 150
- Indexed
- KCI
- Journal Title
- 한국정밀공학회지
- Volume
- 22
- Number
- 8
- Start Page
- 143
- End Page
- 150
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/46289
- ISSN
- 1225-9071
- Abstract
- To verify applicability of multi-dimensional spectral analysis (MDSA) for noise source identification two different approaches which are frequency response and coherent function have been investigated. The coherence function approach appears able to separate the correlated system when the noise sources were coherent. In this study, we identify contribution of structure-borne-noise of vehicle HVAC system using MDSA method. Firstly, to identify the applicability of MDSA method, 4-inputs of vehicle HVAC system were the signals measured by accelerometers attached on the selected noise sources which were composed of blower, evaporator, heater and duct. While 1-output which was driver's position sound was the SPL signals measured by a remote microphone, when the blower motor was operating. We identify efficiency of systems modeled with four inputs/single output through ordinary coherence function (OCF) and partial coherence function (PCF). As a result of experiment, the blower accounted for 62-88% of the overall level of sound energy density. Also, according to the analysis of acoustic signal and vibration signals measurement, an investigation of the noise source identification in the vehicle HVAC is presented. With the sound intensity method, the major sources of the vehicle HVAC radiation are verified. Also the method of improving the noise reduction is proposed by attaching damping patch access to blower motor and noise reduction is verified.
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Collections - COLLEGE OF ENGINEERING SCIENCES > SCHOOL OF ELECTRICAL ENGINEERING > 1. Journal Articles
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