subject:(AVL BOOST)

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University of Texas – Austin

1. Ates, Murat, 1982-. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.

Degree: MSin Engineering, Mechanical Engineering, 2009, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2009-05-80

Development of a fuel economy model for light-duty and heavy-duty vehicles is part of the Texas Department of Transportation’s “Estimating Texas Motor Vehicle Operating Costs” project. A literature review for models that could be used to predict the fuel economy of light-duty and heavy-duty vehicles resulted in selection of coastdown coefficients to simulate the combined effects of aerodynamic drag and tire rolling resistance. For light-duty vehicles, advantage can be taken of the modeling data provided by the United States Environmental Protection Agency (EPA) for adjusting chassis dynamometers to allow accurate determination of emissions and fuel economy so that compliance with emissions standards and Corporate Average Fuel Economy (CAFE) regulations can be assessed. Initially, EPA provided vehicle-specific data that were relevant to a physics-based model of the forces at the tire-road interface. Due to some limitations of these model parameters, EPA now provides three vehicle-specific coefficients obtained from vehicle coastdown data. These coefficients can be related back to the original physics-based model of the forces at the tire-road interface, but not in a manner that allows the original modeling parameters to be extracted from the coastdown coefficients. Nevertheless, as long as the operation of a light-duty vehicle does not involve extreme acceleration or deceleration transients, the coefficients available from the EPA can be used to accurately predict fuel economy. Manufacturers of heavy-duty vehicles are not required to meet any sort of CAFE standards, and the engines used in heavy-duty vehicles, rather than the vehicles themselves, are tested (using an engine dynamometer) to determine compliance with emissions standards. Therefore, EPA provides no data that could be useful for predicting the fuel economy of heavy-duty vehicles. Therefore, it is necessary to perform heavyduty coastdown tests in order to predict fuel economy, and use these tests to develop vehicle-specific coefficients for the force at the tire-road interface. Given these coefficients, the fuel economy of a heavy-duty vehicle can be calculated for any driving schedule. The heavy-duty vehicle model developed for this project is limited to pre-2007 calendar year heavy-duty vehicles due to the adverse effects of emissions components that were necessary to comply with emissions standards that went into effect January 2007. Advisors/Committee Members: Matthews, Ronald D. (advisor), Hall, Matthew J. (committee member).

Subjects/Keywords: Fuel Economy; Fuel Economy Modeling; Light-Duty; Heavy-Duty; Automotive; Vehicle; Coastdown; Coast-down; AVL ADVISOR; AVL CRUISE; AVL BOOST

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APA (6^th Edition):

Ates, Murat, 1. (2009). Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2009-05-80

Chicago Manual of Style (16^th Edition):

Ates, Murat, 1982-. “Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.” 2009. Masters Thesis, University of Texas – Austin. Accessed February 24, 2021. http://hdl.handle.net/2152/ETD-UT-2009-05-80.

MLA Handbook (7^th Edition):

Ates, Murat, 1982-. “Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.” 2009. Web. 24 Feb 2021.

Vancouver:

Ates, Murat 1. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. [Internet] [Masters thesis]. University of Texas – Austin; 2009. [cited 2021 Feb 24]. Available from: http://hdl.handle.net/2152/ETD-UT-2009-05-80.

Council of Science Editors:

Ates, Murat 1. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. [Masters Thesis]. University of Texas – Austin; 2009. Available from: http://hdl.handle.net/2152/ETD-UT-2009-05-80

KTH

2. 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 (6^th 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 (16^th 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 (7^th 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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