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1. Baki, Cem, Mr. COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS.

Degree: MS, Mechanical and Aerospace Engineering, 2019, West Virginia University

Currently in US, more than 26 percent of the total GHG emissions comes from transportation and mostly from heavy duty vehicles. Similarly, the European Council stated that 25 percent of the emissions comes from heavy duty transportation and they expect it to be further increased in the future. However, with the new coming regulations US EPA and European Council aiming to reduce the emissions by 80 percent in US and 60 percent in EU. In order to keep track and control the emissions, both authorities published new regulations and testing methods for certifying the new vehicles. Aerodynamic testing is one of the most important part of certification since, aerodynamic drag is a major contributor of total road load acting on a vehicle which is highly related with emissions of a vehicle. Besides, simulation tools for certification such as “Vehicle Energy Consumption Calculation Tool (VECTO)” and “Greenhouse Gas Emission Model (GEM)” needs drag area ( ) as an input. Moreover, it is essential to determine the drag area correctly, therefore, emission of a vehicle, to be able to estimate the amount of total emissions from heavy duty vehicles. Two different regulatory testing methods were published by US EPA and European Council to determine the drag area ( ) for certification of heavy duty vehicles. While US regulations requires “coast-down (CD)” test, EU regulations requires “constant speed (CST)” test. The objective of this study is to compare these two different regulatory approaches with their different assumptions. In order to be able to make a comparison of these two testing methods, CD and CST performed with same tractor and trailer combination, which is a Class 8 truck for US market, in same conditions. Results yielded up to 9 percent difference between two methods. Possible cause of this difference can be listed as, the different assumptions of each testing method such as speed dependency of losses, different approaches for tire rolling resistance and some neglected or unaccounted loses. These possible reasons were also investigated individually in this study. Advisors/Committee Members: Arvind Thiruvengadam, Marc C. Besch, Marc C. Besch.

Subjects/Keywords: Coast-down; fuel consumption; constant speed test; chassis dynamometer; drag area; drag coefficient; tire rolling resistance; Navigation, Guidance, Control, and Dynamics; Other Mechanical Engineering

…17 3.4.2. Coast Down Test Procedure… …Chapter 4. 3.4.2. Coast Down Test Procedure U.S. EPA clearly describes the coast down test… …vehicle speed and air flow. Two methods are described for coast down test.  Complete Coast… …the complete coast down. If test track length is not enough to perform a complete coast down… …test, it is possible to perform split coast down runs.  Split Coast Down Runs: In this… 

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APA (6th Edition):

Baki, Cem, M. (2019). COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS. (Thesis). West Virginia University. Retrieved from https://doi.org/10.33915/etd.3759 ; https://researchrepository.wvu.edu/etd/3759

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):

Baki, Cem, Mr. “COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS.” 2019. Thesis, West Virginia University. Accessed December 02, 2020. https://doi.org/10.33915/etd.3759 ; https://researchrepository.wvu.edu/etd/3759.

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

MLA Handbook (7th Edition):

Baki, Cem, Mr. “COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS.” 2019. Web. 02 Dec 2020.

Vancouver:

Baki, Cem M. COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS. [Internet] [Thesis]. West Virginia University; 2019. [cited 2020 Dec 02]. Available from: https://doi.org/10.33915/etd.3759 ; https://researchrepository.wvu.edu/etd/3759.

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

Council of Science Editors:

Baki, Cem M. COMPARISON OF DRAG AREA ESTIMATION USING NATURAL COAST DOWN AND CONSTANT SPEED TEST METHODS. [Thesis]. West Virginia University; 2019. Available from: https://doi.org/10.33915/etd.3759 ; https://researchrepository.wvu.edu/etd/3759

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

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