Low Noise Intake System Development for Turbocharged I.C. Engines Using Compact High Frequency Side Branch Resonators

Sabry Allam^1,

¹Automotive Technology Department, Faculty of Industrial Education, Helwan University, Cairo, Egypt

Cite this paper:
Sabry Allam. Low Noise Intake System Development for Turbocharged I.C. Engines Using Compact High Frequency Side Branch Resonators. Advances in Powertrains and Automotives. 2015; 1(1):12-23. doi: 10.12691/apa-1-1-2

Abstract

Turbochargers have become common in passenger cars as well as commercial vehicles. They have an excellent mechanism to effectively increase fuel efficiency and engine power, but they unfortunately cause several noise problems. Its noise are mainly classified as structure-borne noises, generated from the vibration of rotating shaft modules (cartridges), and air-borne noises, from air flow inside turbochargers or their coupling ducts. In this study an attempt to reduce the pulsation noise generated from the compressor wheels, whose frequency is the same as the whine noise is presented. This attempt is based on using the compact high frequency side branch resonators to develop low intake noise system. The design of such system, which is mainly based on the developed 1D linear acoustic theory and theoretical investigations to use more than one resonator connected to the main duct in series and/or in parallel are introduced. An optimization strategy to choose the appropriate resonator axis offset is presented. In case of complex unsymmetrical geometry in real resonators, a 3 D finite element is used. The presented models are validated via comparison with the measured results at room temperatures. The validated models are used to improve the acoustic performance of the real resonators. Based on the developed models and the optimization results, the internal design of resonators improves its acoustic performance; the serial arrangements increase the damping at the same peak frequency while the parallel arrangements make it wider. The amount of extra damping added to the intake system depends on the resonators geometry and their axis offset which can be around 50 dB at the peaks, and 30 dB between peeks at normal operating engine conditions. Extra improvement to the intake system noise reduction can be achieved by redesigning and optimizing the entire system with used resonators under both space and shape constrains.

Keywords:
Engine Intake system noise reduction Turbocharger resonators serial and parallel arrangement 1D linear frequency domain 3D FEM Simulation shape optimization

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References:

[1]	Sheng X., Tian S., Subjective and Objective Evaluation of Turbocharger Noise, Noise and Vibration Control, 33 (3), 241-245, (2013).
[2]	Ricardo M. B., Apostolos P., Yang M., Overview of Boosting Options for Future Down Sized Engines, Sci China Tech Sci, 54(2), 318-331, (2011).
[3]	Sabry Allam, Magnus Knutsson and Hans Boden “Development of Acoustic Models for High Frequency Resonators for Turbocharged IC-Engines”. SAE Paper 2012-01-1559.
[4]	Hans R., Mats A., Acoustics of Turbochargers, SAE Technical Paper Series, (2007).
[5]	R. Veloso, Y. Elnemr, F. M. Reich and S. Allam “Simulation of Sound Transmission through Automotive Turbochargers”. SAE Paper 2012-01-1560.
[6]	Heiki Tiikoja. ‘‘Acoustic Characterization of Turbochargers and Pipe Terminations’’. Licentiate Thesis, TRITA-AVE 2012:07, Universitetsservice US-AB, Stockholm 2012.
[7]	Jung, B, -I., Ko, U. -S., Lim, J. -M., Lee, C. –M., and Han, S, -S., “Development of a Low Noise Intake System Using Non-Helmholtz Type Resonator,” Seoul FISITA World Automotive Congress, 2000.
[8]	Schuchardt, M. E., Dear, T. A., and Ingard, K., ‘‘Four-cylinder air induction,’’ Automot. Eng. 102, 105-108, 1994.
[9]	Nagaya, K., Hano, Y., and Suda, A., “Silencer consisting of two-stage Helmholtz resonator with auto-tuning control,” J. Acoust. Soc. Am. 110(1), 289-265, July 2001.
[10]	Griffin, S., Lane, S. A., and Huybrechts, S., “Coupled Helmholtz resonators for acoustic attenuation,” Trans. ASME, J. Vib. Acoust. 123, 11-17, 2001.
[11]	Seo, S. –H., and Kim, Y. –H., “Silencer design by using array resonators for low-frequency band noise reduction”. J. Acoust. Soc. Am. 118(4), 2332-2338. 2005.
[12]	COMSOL MULTIPHYSICS ver. 5, Acoustics Module, 2015.
[13]	Sullivan, J. W., “A method for modeling perforated tube muffler components. I. Theory,” J. Acoust. Soc. Am. 66, 772-778, 1979.
[14]	Sullivan, J. W., “A method for modeling perforated tube muffler components. II. Application,” J. Acoust. Soc. Am. 66, 779-788, 1979.
[15]	Munjal, M. L., Rao K. N., and Sahasrabudhe, A. D., “Aeroacoustic analysis of perforated muffler components,” J. Sound. Vib. 114, 173-188, 1987.
[16]	Peat, K. S., “A numerical decoupling analysis of perforated pipe silencer elements,” J. Sound. Vib. 123, 199-212, 1988.
[17]	Lee S. -H., and Ih, J.-G. “Impedance of a circular orifice” J. Acoust. Soc. Am., Vol. 114, No. 1, 2003.
[18]	Kirby, R., and Cummings, A., ‘‘The impedance of perforated plates subjected to grazing gas flow and backed by porous media,’’ J. Sound Vib. 217, 619-636, 1998.
[19]	Goldman, A. L., and Panton, R. L. ‘‘Measurement of the acoustic impedance of an orifice under a turbulent boundary layer,’’ J. Acoust. Soc. Am. 60, 1397-1404, 1976.
[20]	Rice, E. J., “A Theoretical Study of the Acoustic Impedance of Orifices in the presence of a steady Grazing Flow,” NASA Rept. TM. X-71903, April 1976.
[21]	Elnady T., and Bodén, H., “On the modeling of the acoustic impedance of perforates with flow,” Part of it presented as AIAA 2003-3304 at the 9th AIAA/CEAS Aeroacoustics Conference, May 2003, Hilton Head, SC, USA., 2003. 1.1.1, 1.1.3, 2.7, 2.7, 2.14, 2.15, 2.15, 3.1, 3.1, 4.
[22]	Bauer, B., “Impedance theory and measurements on porous acoustic liners,” J. Aircraft 14, 720-728, 1977.
[23]	Allam, S., and Åbom, M., “Acoustic Modeling and Testing of a Complex Car Muffler” The 13th ICSV 2006 - July 2-6, Vienna, Austria.
[24]	Åbom, M., “Measurement of the Scattering-Matrix of Acoustical Two-Ports,” Journal of Mech. System and Signal Proceeding 5(2), 89-104, 1991.
[25]	Allam S., and Åbom, M., “A New Type of Muffler Based on Microperforated Tubes” Trans. ASME, J. Vib. Acoust, 133/ 031005, pp1-8, 2011.