Investigation of Porous Material Effects on Automotive Intake System Using Statistical Energy Analysis

Document Type: Persian

Authors

1 Porfessor , Iran University of Science and Technology.

2 Assistant Porfessor, Iran University of Science and Technology

3 M.Sc. Student, Iran University of Science and Technology

4 Ph.D. Student, Iran University of Science and Technology

Abstract

Automobile manufactures are persistently trying to develop comfort of passengers by improving different specification such as decrease of sound level in engine compartments. There is a main problem that the noise generated in air intake systems may be disgusting. Statistical energy analysis is a suitable method for acoustical- vibration analysis of structures in high frequency range. In this paper, the air intake system of an engine compartment is modeled using SEA. The transmission loss through the intake duct is calculated with importing CAD model and creating subsystems at high frequency range. In addition, comparing the results of fully modeled of intake systems with current experimental data, shows a good accuracy of results especially in high frequency range. Furthermore, the influence of inserting porous material is studied.

Keywords


[1] Lyon R. H., Dejong R. G., Theory and Application of SEA, Butterworth-Heinemann, Second Edition, 1995.

[2] Ohadi hamedani A., Langroudi J., Forecast of SPL of Acoustical Cavity in High Frequency Range Using SEA, 12th annual conference on mechanical engineering, Tehran university, Iran, 2004.

[3] Dejong R. G., Owerview of Statistical Energy Analysis, SAE Con., SEA Work Shop,2001.

[4] Dejong R. G, Bharj T. S. & Lee J. J., Vehicle Wind Noise Analysis Using a SEA Model with Measured Source Levels, SAE paper, 2001,
pp. 1611-1629.

[5] Dejong R. G., A Study of Vehicle Interior Noise Using Statistical Energy Analysis, SAE Paper 850960, 1985.

[6]. Cimerman B., Bremner P., Yang Qian and Van Buskirk J. A., Incorporating Layered Acoustic Trim Materials in Body Structural-Acoustic Models, SAE 951307, 1995, pp. 2289-2294.

[7] Dias T., Monaragala R. and Needham P., Analysis of Sound Absorption of Truck spacer Fabrics to Reduce Automotive Noise, Measurement Sience and Technology, Vol. 18, 2007, pp. 2657-2666.

[8] Kino H., Ogasawara Y., Ito S. , Komori T., Air Intake Duct and Manufacturing Method Therefor, United State Patent, US 6,622,680 B2, 2003.

[9] Delanghe Ir. K., An Approach to Model High Frequency Vibro-Acoustic, ISAAC7, Leuven, 1996, pp. 16-19.

[10]. AutoSEA2 User's Guide, ESI Group., July 2004.

[11] www.cctplastics.com/polypropylene.

]12[ تست صوت سیتم مکش موتور EF7، موجود در مرکز تحقیقات ایران خودرو (NPD).

[13] Steel  J. A.,  A study of engine noise transmission using statistical energy analysis, Proceedings of the institution of mechanical engineers, ProQuest Science Journals,3, 2005, pp. 205- 213.

[14] AutoSEA2 Theory & Q. A. Manual, Vibro-Acoustic Science, 2005.