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KTH

1. Ramanathan, Sathish Kumar. Linear Acoustic Modelling and Testing of Exhaust Mufflers.

Degree: Aeronautical and Vehicle Engineering;, 2007, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4340 

Intake and Exhaust system noise makes a huge contribution to the interior and exterior noise of automobiles. There are a number of linear acoustic tools developed by institutions and industries to predict the acoustic properties of intake and exhaust systems. The present project discusses and validates, through measurements, the proper modelling of these systems using BOOST-SID and discusses the ideas to properly convert a geometrical model of an exhaust muffler to an acoustic model. The various elements and their properties are also discussed. When it comes to Acoustic properties there are several parameters that describe the performance of a muffler, the Transmission Loss (TL) can be useful to check the validity of a mathematical model but when we want to predict the actual acoustic behavior of a component after it is installed in a system and subjected to operating conditions then we have to determine other properties like Attenuation, Insertion loss etc,. Zero flow and Mean flow (M=0.12) measurements of these properties were carried out for mufflers ranging from simple expansion chambers to complex geometry using two approaches 1) Two Load technique 2) Two Source location technique. For both these cases, the measured transmission losses were compared to those obtained from BOOST-SID models. The measured acoustic properties compared well with the simulated model for almost all the cases.

Subjects/Keywords: Acoustic Modelling; Exhaust System; Muffler; End Corrections; Transfer Matrix; Acoustical two port; Acoustical one port; Two Microphone Method (TMM); Transmission Loss; Attenuation; Reflection Co-efficient; AVL Boost; Acoustics; Akustik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ramanathan, S. K. (2007). Linear Acoustic Modelling and Testing of Exhaust Mufflers. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4340

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Ramanathan, Sathish Kumar. “Linear Acoustic Modelling and Testing of Exhaust Mufflers.” 2007. Thesis, KTH. Accessed February 24, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4340.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ramanathan, Sathish Kumar. “Linear Acoustic Modelling and Testing of Exhaust Mufflers.” 2007. Web. 24 Feb 2021.

Vancouver:

Ramanathan SK. Linear Acoustic Modelling and Testing of Exhaust Mufflers. [Internet] [Thesis]. KTH; 2007. [cited 2021 Feb 24]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4340.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ramanathan SK. Linear Acoustic Modelling and Testing of Exhaust Mufflers. [Thesis]. KTH; 2007. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4340

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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