Title: A method for identification of transfer path of abnormal interior sound caused by front-end accessory

Authors: Cheng Yang; Chunlin He; Meilong Hu

Addresses: College of Automotive Engineering, Chongqing University, Chongqing, Shapingba, 400044, China ' College of Automotive Engineering, Chongqing University, Chongqing, Shapingba, 400044, China ' College of Automotive Engineering, Chongqing University, Chongqing, Shapingba, 400044, China

Abstract: Reduction of abnormal interior sound is of great significance for improving the acoustic performance and riding comfort of a vehicle. For a multiple-input single-output (MISO) system, if inputs are correlated, the cause of a problem might not be correctly detected. In this case, a transfer path analysis (TPA) method based on Hilbert transform (HT) approach can be used for severity ranking between every two input signals, to find out the major contributor and transfer direction. This paper chooses a case study of abnormal interior sound from a sport utility vehicle when the heating ventilation and air conditioning (HVAC) system is working. And the method above is applied with four correlated inputs. Practical analysis results illustrate that the compressor pressure low (PL) has the highest severity level over other inputs. After applying improvements, the interior noise decreases by 7-10 dB(A) at observation frequency and the abnormal sound problem is nearly solved.

Keywords: abnormal interior sound; Hilbert transform; severity ranking; transfer path identification; correlated inputs; HVAC systems; heating ventilation and air conditioning; compressor pressure low; front-end accessories; ride comfort; vehicle noise; multiple-input single-output; MISO; sport utility vehicles; SUVs.

DOI: 10.1504/IJVNV.2016.081826

International Journal of Vehicle Noise and Vibration, 2016 Vol.12 No.4, pp.331 - 345

Available online: 25 Jan 2017 *

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