Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 148 for “"heavy-duty"”.
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Heavy duty mack truck styling
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1949
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Heavy-duty emissions inventory and prediction
Heavy duty vehicle emissions represent a significant portion of the mobile source emissions inventory. Accurate estimation of their contribution is essential as on-highway and non-road heavy duty diesel emissions account for at least one third of the oxides of nitrogen (NOx) in the inventory. West …
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Real world heavy-duty vehicle emissions modeling
Heavy-duty vehicle emissions represent a significant portion of the mobile source emissions inventory. Accurate estimation of their contribution is essential as on-highway and non-road heavy-duty diesel emissions account for at least one third of the oxides of nitrogen (NOx) in the inventory. West …
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Simulation of heavy-duty hybrid electric vehicles
… were used to simulate the driving conditions of heavy-duty hybrid electric vehicles over various driving cycles in an attempt to optimize their design and control. The fuel economy data thus obtained were compared with those of the in-use heavy-duty hybrid electric vehicles. For this the drive …
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Optimum hybrid vehicle configurations for heavy duty applications
… of several production vehicles in both heavy-duty and light-duty applications. Hybrid electric vehicles (HEVs) use a combination of electric motor(s) and another power source such as an internal combustion engine (ICE) or fuel cell. While these vehicles show great potential for use in a …
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Data-Rich Multivariable Control of Heavy-Duty Engines
… experimentally on a full-scale six-cylinder heavy-duty engine. The work is divided into four areas: virtual emissions sensing, dynamic emissions models, optimal engine control, and control of sensitive combustion modes. The theme of the thesis is to show how feedback control based on rich …
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Inventory and prediction of heavy-duty diesel vehicle emissions
… create an emissions inventory. These factors for heavy-duty diesel vehicles have been addressed and their relative affect on emissions was evaluated from test data and analytical analyses. These elements can affect the emissions by a factor of 15 depending on testing conditions.;One purpose that …
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Analysis of parasitic losses in heavy duty diesel engines
… analysis of the sources of friction within a heavy-duty diesel engine was undertaken and empirical data on engine friction and component wear was collected from industry as well as from studies in literature. The use of thermal barrier coatings (TBC) was investigated as a novel approach to …
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Transfer function of heavy duty gas turbine combustor components.
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1978
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Performance evaluation of diesel particulate filters on heavy-duty vehicles
Diesel particulate filters, or DPFs, are exhaust aftertreatment devices used to reduce exhaust emissions from diesel powered vehicles. Typical designs have a wall flow filter element downstream of an oxidation catalyst, which oxidizes a portion of the NO present in the exhaust stream to form NO2. …
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Development of a heavy-duty vehicle chassis dynamometer test route
A heavy duty vehicle chassis dynamometer driving route, titled "City-Suburban Heavy Vehicle Route" (CSHVR) was developed. Data for designing the CSHVR were collected using a Campbell Scientific 21x. Procedures were developed to reduce statistically the speed and time data into representative speed …
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A new method of termination for heavy-duty synthetic rope fibres
Termination of heavy-duty synthetic fibre ropes has long been an issue of concern in marine environments. Recent serious rope accidents and new requirements for lighter ropes with better performance in mooring lines have encouraged industry to look for new methods for increasing line performance …
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Real-time measurement of oxides of nitrogen from heavy-duty diesel engines
… comparison and prediction of NOx emissions from heavy-duty diesel engines using two different NOx analyzers. Steady state and transient tests were conducted on six heavy-duty diesel engines in the WVU Engine and Emissions Research Center (EERC). NOx emissions were measured using a conventional …
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Characterization of in-use emissions from on-highway heavy-duty diesel engines
Class-8 trucks with GVWR of 80,000 lbs were tested on different driving routes and in-use brake-specific emissions of NOx and CO2 data were collected using the West Virginia University's Mobile Emissions Measurement System (MEMS). An uncertainty analysis was performed on the MEMS and it was …
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Evaluating heavy-duty diesel engine aftertreatment devices with a split exhaust configuration
West Virginia University evaluated diesel oxidation catalysts (DOC) and lean-NOx catalysts as part of the Diesel Emissions Control-Sulfur Effects (DECSE) program. In order to perform thermal aging of the DOC and lean-NOx catalysts simultaneously and economically, each catalyst was sized to …
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Numerical investigation of the piston skirt lubrication in heavy duty diesel engines
… piston skirt-liner interface, specifically in heavy duty diesel engines, is investigated in this thesis work using a model developed in-house. Prior to the calculation of various cases for parametric study, improvements were made to the existing model in order to incorporate the characteristics …
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Conceptual evaluation of hydrogen hybrid combustion for heavy-duty engines using CFD modelling
… a novel hydrogen combustion concept for heavy-duty engines using pre-chamber ignition technology operating in a hybrid combustion mode combining spark-ignition and diffusive combustion. Computational fluid dynamics (CFD) simulations were conducted using the commercially available software …
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Effects of artificial neural network speed-based inputs on heavy-duty vehicle emissions prediction
… performed in Southern California on thirty-four heavy-duty diesel vehicles using the West Virginia University Transportable Heavy-Duty Vehicle Emissions Testing Laboratories to gather emissions data of these vehicles. The data obtained from six vehicles in the 1985--2001 model year and …
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Characterization of exhaust emissions from catalyzed trap-equipped non-road heavy-duty diesel engines
… of ultra low sulfur fuels on an off-road, heavy-duty engine retrofitted with catalyzed traps. The study was conducted, on an 8 cylinder, mechanically controlled Caterpillar 3408, rear engine of a Scraper. An in-field transient duty cycle was determined by logging the engine speed and torque …
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