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Construction of an Acoustic FE Model for the Purpose of Engine Noise Reduction

Article of Honda R&D Technical Review Vol.13 No.2

Summary

A study was conducted in the construction of an acoustic finite element model with the velocity of vibration of the trimmed body as a boundary condition. An experimental model using velocity as the boundary condition was created by measuring the vibrational acceleration of each panel of a trimmed body by excitation measurement. The trim panel impedance was also set as a boundary condition for the acoustic FE model. It was decided that the setting values for the acoustic FE model, which provides a simple representation of multilayered trim panels, should be made approximately equivalent to actual measurement values. This hybridization of a structural experimental model and an acoustic FE model made it possible to represent the acoustic characteristics of the trimmed body up to 350Hz. It also enabled analysis of methods for efficiently minimizing the vibration level of vehicle body panel parts that contribute significantly to engine noise and for reducing the vibro-acoustic transfer function from the engine mount to passenger ear locations.

Reference

(1) Kimura, Keisuke: Technical Development Using the Structural and Acoustic Hybrid Model for Reducing Vibro-acoustic Transfer Function, Society of Automotive Engineers of Japan, Inc., 1998 Fall Conference, Technical Lecture Preprint Collection, No.78-98, p.1-4(1998)
(2) Kurokawa, Isamu: Reduction of Booming Noise in Heavy Duty Truck Cab – Part 1 Contribution Analysis of Floor Panel Vibration, Society of Automotive Engineers of Japan, Inc., 1998 Fall Conference, Technical Lecture Preprint Collection, No.78-98, p.5-8 (1998)
(3) Kurokawa, Isamu: Reduction of Booming Noise in Heavy-duty Truck Cab – Part 2 Reduction of Booming Noise by Floor Structure Modifications, Society of Automotive Engineers of Japan, Inc., 1998 Fall Conference, Technical Lecture Preprint Collection, No.78-98, p.9-12 (1998)
(4) Sung, Shung H., et al.: Development and Experimental Evaluation of a Vehicle Structural Trimmed-Body Model, Proceeding of the 1999 Noise & Vibration Conference, P-342, Vol.2, p.1135-1140 (1999)

Author (organization or company)

Kazufumi KAWABATA(Tochigi R&D Center)、Tatsuhide SAKAI(Tochigi R&D Center)、Nobuaki HASHIMOTO(Tochigi R&D Center)

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