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Enhancement of Diesel Combustion Noise for Interior Sound Quality – Transfer Path Analysis Using Principal Component Regression Method –

Article of Honda R&D Technical Review Vol.21 No.2

Summary

An analysis focusing on the transfer paths of combustion noise from the engine to the interior of the cabin was conducted in order to enable enhancement of audible in-cabin diesel combustion noise during the development of the 2009 model year ACCORD diesel. Transfer path analysis using the principal component regression method was employed to analyze the degree of contribution to noise transfer. First, the airborne and structure-borne contribution for 920-2300 Hz radiation noise, which represents an issue from the perspective of combustion noise, was analyzed. Following this, the input paths for the structure-borne component were determined. As a result, it was judged that despite the fact that airborne transfer has been regarded as the major factor in the case of the high-frequency band, the structure-borne component also has a profound effect. Methods of enhancing interior sound were examined based on the results of the contribution analysis.
Reducing the transferred components by controlling vibration in the mounts has enabled enhancement of combustion noise in the cabin.

Reference

(1) Noumura, K., Yoshida, J.: Method of Transfer Path Analysis for Interior Vehicle Sound Using Principal Component Regression Method, Honda R&D Technical Review, Vol. 18, No. 1, p. 136-141
(2) Noumura, K., Yoshida, J.: Quantification of Luxury and Sporty Car Interior Sounds Perceived by the General Public in Different Markets, Transactions of Society of Automotive Engineers of Japan, Vol. 34, No. 4, p. 187-193 (2003)
(3) Noumura, K., Okada, Y.: Sound Quality Evaluation Technique of Vehicle in Consideration of Auditory Characteristic, HONDA R&D Technical Review, Vol. 9, p. 131-139

Author (organization or company)

Yasuhiro HISANO(Automobile R&D Center)、Reiko HIRAIDE(Automobile R&D Center)

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