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.
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Showing 1 to 20 of 22 for “"heavy truck"”.
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HEAVY TRUCK COLLISION WITH BRIDGE PIERS
… piers have been carried out with single-unit trucks, which are typically classified as medium-duty vehicles weighing about 89 kN (20,000 lb). Yet, collision events that involve severe bridge damage are generally caused by heavy-duty trucks, generally tractor-semitrailers weighing 360 kN …
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Modeling of heavy truck dynamics for computing pavement loads
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
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Experimental Evaluation of Semiactive Magnetorheological Primary Suspensions for Heavy Truck Applications
… magnetorheological primary suspension on a heavy truck application. A set of magnetorheological dampers is designed, fabricated, and characterized. The set of magnetorheological test dampers are implemented on a Volvo VN heavy truck. An embedded controller determines the level of damping to …
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On the Development of a Real-Time Embedded Digital Controller for Heavy Truck Semiactive Suspensions
… primary suspension for a class 8 highway truck. The controller used a skyhook policy (where the semiactive damper simulates a damper between the sprung mass and an inertial reference) to control magneto-rheological dampers placed on the truck 's primary suspension in response to …
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Hardware in the Loop Simulation of a Heavy Truck Braking System and Vehicle Control System Design
… accurately model a 6x4 tractor-trailer rig using TruckSim and simulate severe braking and handling maneuvers with hardware in the loop and software in the loop simulations. For the hardware in the loop simulation (HIL), the tractor model was integrated with a 4s4m anti-lock braking system (ABS) …
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Flow Characterization and Redesign of Load-Leveling Valves for Improving Transient Dynamics of Heavy Truck Air Suspensions
… used for air suspension systems of commercial trucks. The first valve features a simple disk/slot design and is relatively compact for installation. The second type is larger and has a sophisticated, chambered design, which allows for considerably quicker fill and exhaust response times in the …
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Tools and Techniques for Flow Characterization in the Development of Load Leveling Valves for Heavy Truck Application
… suitability of the valve for application in a truck-suspension configuration and for comparison among similar products. The disk-slot type load leveling valve was chosen as the subject of this study due to its popularity in the heavy truck industry. Three distinct methods are presented to model …
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Low-Speed Maneuverability, High-Speed Roll-Stability, and Brake Type Performance of Heavy Truck 33-ft Double Trailers
This dissertation details the methods and analysis of extensive physical tests and simulation conducted by the Center for Vehicle Systems and Safety (CVeSS) at Virginia Tech on the maneuverability, roll-stability, and brake type performance of 33-ft double trailers. Little literature exists for …
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Development of a Heavy Truck Vehicle Dynamics Model using Trucksim and Model Based Design of ABS and ESC Controllers in Simulink
… of an Anti-lock Braking System (ABS) for a heavy truck was performed using dSPACE. TruckSim, developed by Mechanical Simulation Corporation (MSC), was used to model the vehicle dynamics. The tractor was equipped with disc brakes and the trailer was equipped with drum brakes. Model validation …
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Developing pavement preservation and mitigation strategies using Pavement ME design guide for Rhode Island DOT
… had a 22% higher concentration of Class 9 trucks and the second distribution had over 80% of Class 5 trucks. The crack seal and stress absorbing membrane interlayer alternatives were the most cost effective in all cases. Chip Seal was cost effective for the three and five layer structures …
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Alternative methods for pavement network rehabilitation management
… deteriorating at a rapid rate due to its age and heavy truck loadings. Meanwhile, the required funds for rehabilitation far exceed the available budget. Illinois DOT administrators and planners are faced with many difficult questions about the consequences of adopting different pavement …
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Influence of tire-pavement thermomechanical interaction on contact stresses and rolling resistance
… by both loading and environmental conditions. Heavy truck loads govern pavement responses and, thus, the eventual pavement damage. The anticipated increase in freight load and volume along with the prospect of autonomous truck platooning make it imperative that transportation agencies update …
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Intelligibility of synthesized voice messages in commercial truck cab noise for normal-hearing and hearing-impaired listeners
… noise, interior noise of a currently produced heavy truck, and truck cab noise with added background speech. A quiet condition was also investigated. During recording of the truck noise for the experiment, in-cab noise measurements were obtained. According to OSHA standards, these data …
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An Integrated Time-Temperature Approach for Predicting Mechanical Properties of Quenched and Tempered Steels
… time – temperature profiles of three production heavy truck side rails were then simulated. The tempering model provided a good prediction of the tempered hardness compared to experimental measurements. Finally, conclusions are drawn and suggestions are made for future work.
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Evaluating the Effectiveness of Electronic Stability Systems in Reducing Truck Rollovers
… Stability Program (ESP) systems to prevent heavy truck rollovers when navigating horizontal roadway curves. While most of the published literature on electronic stability control focuses on the effectiveness of stability systems in passenger cars, very few researchers have considered its …
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Experimental Evaluation of a Trailing-Arm Suspension for Heavy Trucks
… of a prototype trailing-arm suspension for heavy trucks. The primary goal of this new suspension is to match or improve the kinematics and dynamic performance of an existing "Z-bar" suspension. Significant reductions in cost, weight, and number of parts are the main reasons for this …
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A Derivation Of An Empirical Equation For Estimating The Acoustical Shadow Zone Length Of Roadway Noise Barriers
… the roadway to the noise barrier, and percent of heavy truck traffic volume were statistically significant as useful predictors of SZL. Two empirical equations were derived, one from linear regression and one from polynomial regression, and are referred to as the Shadow Zone Equations.
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Uncertainty quantification for pavement life-cycle stages
… deflection. Factors affect EFC includes, truck loading and speed and pavement temperature. It was found that the estimated EFC for a heavy truck could be as low as 0.03% for a half loaded truck at a temperature of 0 °C a speed of 115 km/h and as high as 6.5% for a fully loaded truck at a …
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Modeling, Control, and Design Study of Balanced Pneumatic Suspension for Improved Roll Stability in Heavy Trucks
… pneumatic suspensions that are commonly used in heavy trucks, toward providing a dynamically balanced system that resists body roll and provides added roll stability to the vehicle. The new suspension, referred to as "balanced suspension," is implemented by retrofitting a conventional pneumatic …
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Large Force Range Mechanically Adjustable Dampers for Heavy Vehicle Applications
Semi-active dampers utilizing various working principles have been developed for a variety of vehicles. These semi-active dampers have been designed to resolve the ride and handling compromise associated with conventional passive dampers, and increase vehicle stability. This thesis briefly reviews …
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