A Multi-Chamber Silencer for Turbocharger Noise

Document Number: 2009-01-2048

Date Published: May 2009

Author(s):
Iljae Lee - Chonbuk National Univ.
Ahmet Selamet - Ohio State Univ
Tae-chung kim - Hyundai-Kia Motors
Juin Kim - Hyundai-Kia Motors

Abstract:
A multi-chamber silencer is designed by a computational approach to suppress the turbocharger whoosh noise downstream of a compressor in an engine intake system. Due to the significant levels and the broadband nature of the source spanning over 1.5 - 3.5 kHz, three Helmholtz resonators are implemented in series. Each resonator consists of a chamber and a number of slots, which can be modeled as a cavity and neck, respectively. Their target resonance frequencies are tuned using Boundary Element Method to achieve an effective noise reduction over the entire frequency range of interest. The predicted transmission loss of the silencer is then compared with the experimental results from a prototype in an impedance tube setup. In view of the presence of rapid grazing flow, these silencers may be susceptible to whistle-noise generation. Hence, the prototype is also examined on a flow bench at varying flow rates to assess such flow-acoustic coupling. The resulting configuration has provided a satisfactory control of the whoosh noise.

File Size: 929K
Product Status: In Stock

Included in: V118-6

See other papers presented at SAE 2009 Noise and Vibration Conference and Exhibition, May 2009, St. Charles, IL, USA, Session: Intake / Exhaust (Part 1 of 3)

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