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 19 of 19 for “"roll stability"”.
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High-Speed Roll Stability Evaluation of A-Double Tractor-Trailers
… and longitudinal off-centering on high-speed roll stability of A-double tractor trailers with 28-ft and 33-ft straight-rail and drop-frame trailers is evaluated through simulation and track testing. The changes in CG position due to the type of trailer (straight-rail vs. drop-frame) and …
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Experimental Evaluation of Roll Stability Control System Effectiveness for A-double Commercial Trucks
… (CVeSS) at Virginia Tech for evaluating the roll stability of commercial trucks with 33-ft A-double trailers are evaluated. The study includes straight-rail trailers with heavy and light loading conditions. Commercial trucks are more susceptible to rollovers than passenger cars because of …
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Experimental Evaluation of the Dynamic Performance Benefits of Roll Stability Control Systems on A-train Doubles
The ride stability of an A-train 28-foot double tractor trailer when outfitted with different Roll Stability Control (RSC) systems with the same payload and suspension configurations is studied experimentally for various dynamic maneuvers. The primary goal of the study is to determine the effect of …
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Modeling, Control, and Design Study of Balanced Pneumatic Suspension for Improved Roll Stability in Heavy Trucks
… 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 suspension with two leveling valves and a symmetric plumbing arrangement to …
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Enhancing roll stability and directional performance of articulated heavy vehicles based on anti-roll control and design optimization.
… an investigation to actively improve the rollover stability of articulated heavy vehicles (AHVs) during high speed manoeuvres using anti-roll control systems. A 3-dimensional (3-D) linear yaw/roll model with 5 degrees of freedom is developed. Based on this model a linear quadratic …
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Low-Speed Maneuverability, High-Speed Roll-Stability, and Brake Type Performance of Heavy Truck 33-ft Double Trailers
… (CVeSS) at Virginia Tech on the maneuverability, roll-stability, and brake type performance of 33-ft double trailers. Little literature exists for 33-ft doubles because they are uncommon on the U.S. roads due to current federal restrictions limiting long-combination vehicles to 28-ft doubles. With …
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Analysis, detection and early warning control of dynamic rollover of heavy freight vehicles
The conceptual design of the early warning based roll instability enhancement system is realized through systematic investigations on static and dynamic roll behavior of the vehicles, identification of indicators for the onset of instability, and reliability analysis. The relative and absolute roll …
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Optimal tank design and directional dynamic analysis of liquid cargo vehicles under steering and braking
The stability and dynamic response characteristics of partially-filled tank vehicles are adversely influenced by the movement of the liquid cargo within the tank. The directional dynamics and stability characteristics of partially-filled tank vehicles are analyzed and enhanced through formulation …
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Design and Build of a Hydrofoil Boat
… foils also provide the height control and roll stability necessary for stable flight. The hydrofoils are removable and thus allow the watercraft to be operated as a conventional personal watercraft when foiling is undesired. Estimates based on the hydrofoil boat design and manufactured …
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A New Fuzzy Based Stability Index Using Predictive Vehicle Modeling and GPS Data
… Additionally, the increasing use of yaw and roll stability control in commercial trucks has contributed to an increased level of safety for truck drivers. However, these systems require the vehicle to begin a yaw or roll event before they assist in maintaining control. This thesis presents a …
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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
… and a model-based design of ABS and ESC controllers. In addition to this, a Hardware-in-the-Loop (HIL) simulation 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 …
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Optimally-robust nonlinear control of a class of robotic underwater vehicles
… axial symmetry, and passive roll stability. These vehicles are optimized for robotic applications needing power efficiency for long-range autonomous operations and motion stability for sensor performance improvement. A familiar example is the REMUS vehicle. The particular …
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Design of a Portable Tire Test Rig and Vehicle Roll-Over Stability Control
… provided by a tire manufacturer. Then, a simple rollover study of a military truck will be compiled in TruckSim. Lastly, a control method for the rollover case will be designed and implemented. The results of the roll control simulation are positive. The study shows an increase in dynamic roll …
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Dynamic Modeling and Lateral Stability Analysis of Long Combination Vehicles
… comprehensive modeling evaluation of the dynamic stability of Long Combination Vehicles (LCVs) that are commonly operated on U.S. highways, using multibody dynamic simulations in MATLAB/Simulink®. The dynamic equations for a tractor with two trailers connected by an A-frame converter dolly …
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An investigation of vibration isolation systems using active, semi-active and tunable passive mechanisms, with applications to vehicle suspensions
… ride and handling performance. Analysis of a roll plane model of a vehicle employing the tunable interconnected suspension shows that the connections of fluid flow within the interconnected suspension provide an enhanced static roll stability; while the tunable pressure limiting modulation …
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Torque Actuated Rear Steering for Urban Electric Commercial Vehicles
… at low speeds, 2. At high speed, improve roll-over stability and emergency braking and cornering performance while maintaining accurate path following. Chapter 1 reviews the current state of greenhouse gas emissions within the freight industry and methods for decarbonisation, predominantly …
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Roll and Yaw Stability Evaluation of Class 8 Trucks with Single and Dual Trailers in Low- and High-speed Driving Conditions
A comprehensive evaluation of roll and yaw stability of tractor/semitrailers with single and dual trailers in city and highway conditions is conducted. Commercial vehicles fundamentally behave differently in city driving conditions than at high speeds during highway driving conditions. In order to …
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Hardware in the Loop Simulation of a Heavy Truck Braking System and Vehicle Control System Design
… simulation (SIL), anti-lock braking (ABS) and roll stability control (RSC) algorithms were developed using Simulink and tested with the TruckSim model. By properly simulating the tractor-trailer rig using HIL and SIL simulations, severe maneuvers could be performed and the rig’s response …
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Analytical and experimental investigations of ships impact interaction with one-sided barrier
… of ships with one-sided ice barrier during roll dynamics. An analytical model of ship roll motion interacting with ice is developed based on Zhuravlev and Ivanov non-smooth coordinate transformations. These transformations have the advantage of converting the vibro-impact oscillator into an …