Simulated Operational Path Analysis Method for the Separation of Intake and Exhaust Noises

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.