Simulated Operational Path Analysis Method for the Separation of Intake and Exhaust Noises
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ORIGINAL PAPER
Simulated Operational Path Analysis Method for the Separation of Intake and Exhaust Noises Yawei Zhu1,2,3 · Chihua Lu1,2,3 · Zhien Liu1,2,3 · Weizhi Song1,2,3 · Liping Xie1,2,3 · Jian Shen1,2,3 Received: 9 March 2020 / Accepted: 29 May 2020 © Australian Acoustical Society 2020
Abstract The classical transfer path analysis (TPA) method has become a standard measurement method. It has high accuracy but remains a time-consuming and complex measurement, which limits its application in industry. The operational transfer path analysis (OTPA) method is known for its high efficiency; however, the accuracy of this method for industrial application is controversial. To separate the intake and exhaust noises in the vehicle, this study presents a novel TPA method called simulated operational path analysis (SOPA). The transmissibility from the reference point to the target response point is estimated by using an external noise source to simulate the intake and exhaust noises under operating condition. In addition, the improved dual-microphone noise reduction technology is used to eliminate the background noise in the reference response. The method is validated by an experimental bench. The result shows that its high accuracy can be compared with the classical TPA method. Because there is no need to use a special miniature volume source to estimate the passive subsystem frequency response functions and identify the operational source loads, the efficiency of the SOPA method is higher than the classic TPA method and is close to the OTPA method. Keywords Intake and exhaust noises · Simulated operational path analysis · Transmissibility · Crosstalk cancelation · Dualmicrophone noise reduction
Introduction Intake and exhaust noises are one of the main noise sources of vehicles, and their corresponding sound quality characteristics directly affect the interior sound quality. Researching the sound design of intake and exhaust noises is beneficial to improving the sound quality of vehicles [1, 2]. To evaluate the effect of both noises on the total noise in the vehicle, engineers usually use a big muffler to facilitate complete elimination or lead the intake and exhaust noises away * Zhien Liu [email protected] 1
Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China
2
Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan 430070, China
3
Hubei Research Center for New Energy and Intelligent Connected Vehicle, Wuhan University of Technology, Wuhan 430070, China
through the hose. However, this method can only obtain the reduction in the interior noise after completely eliminating the intake and exhaust noises and cannot obtain the time-domain signals of their target responses in the vehicle. Therefore, it is impossible to subjectively evaluate the intake and exhaust noise components in the interior noise. The transfer path analysis (TPA) method is usually used to estimate the tar
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