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 40 for “"Vehicle stability"”.
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Modeling, analysis, and measurement of passenger vehicle stability
Vehicle rollover represents a significant percentage of single-vehicle accidents and accounts for over 9,000 fatalities and over 200,000 non-fatal injuries each year. Previous automotive research has studied ways for detecting and mitigating rollover on flat ground at high speed, and robotics …
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Open loop aspects of two-wheeled vehicle stability characteristics
… While the literature regarding two wheeled vehicle behavior is extensive, to this day, no consensus exits in the literature as to what principles govern the steering and stability characteristics of two wheeled vehicles. This is due in part to the complex nature of the dynamic equations of …
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Optimal Vehicle Stability Control with Driver Input and Bounded Uncertainties
For decades vehicle control has been extensively studied to investigate and improve vehicle stability and performance. Such controllers are designed to improve driving safety while the driver is still in control of the vehicle. It is known that human drivers are capable to learn and adapt to their …
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Intelligent Tire Based Tire Force Characterization and its Application in Vehicle Stability and Performance
… defining both the safety and performance of the vehicle. The interaction between the tire and the road surface determines the vehicle's ability to accelerate, decelerate and steer. Having information about this interaction in real-time can be very valuable for the on-board advanced active safety …
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Estimation of vertical load on a tire from contact patch length and its use in vehicle stability control
… a suitable control input to maintain the yaw stability of a moving vehicle. A two degree of freedom bicycle model was used for developing the control strategy. A linear quadratic regulator (LQR) was designed for the purpose of controlling the yaw rate and maintaining vehicle stability.
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Dynamic performance of small diameter tunnel thrusters.
… Previous work on positioning Remotely Operated Vehicles with a ducted propeller had shown that lags in the thruster response caused limit cycling in the vehicle's behavior. These experiments have shown that the influence of the fluid inertia in the tunnel is significant and changes the lagging …
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Integrated vehicle dynamics control using active steering, driveline and braking
… thesis investigates the principle of integrated vehicle dynamics control through proposing a new control configuration to coordinate active steering subsystems and dynamic stability control (DSC) subsystems. The active steering subsystems include Active Front Steering (AFS) and Active Rear …
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Intelligent mobility control of a hybrid electric off-road vehicle with individual wheel control
… of Individual Wheel Control on a large off-road vehicle. The vehicle concerned is a theoretical, six-wheel drive, off-road Hybrid-Electric Vehicle based on an existing conventional six-wheel-drive Combat Support Vehicle developed by QinetiQ (formerly DERA). The proposed vehicle utilises …
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Stability and maneuvering of hybrid hydrofoil/SWATH in foilborne mode
… and patented by Stefano Brizzolara, is a novel vehicle design that is optimized to operate in both a high speed foilborne mode and a displacement mode. The retractable hydrofoils on the vehicle take on a unique four surface piercing anhedral foil configuration. This foilborne design is …
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The Application of Intelligent Tires and Model Base Estimation Algorithms in Tire-road Contact Characterization
… in pavement friction and poor performance of the vehicle stability, traction and ABS controllers on the low friction surfaces are the most important factors affecting car crashes. Due to its direct relation to vehicle stability, accurate estimation of tire-road characteristics is of interest to …
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Prototype development and testing of active yaw moment control system using vehicle momentum wheel
Vehicle stability is the essential key to evade accidents and drive without harm. It is in actual an extremely dynamic and active research topic nowadays. Active yaw moment control to improve vehicle’s handling and stability has been chosen as the control strategy. This technique uses a momentum …
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Development of H∞ control strategy for a multi-wheeled combat vehicle
A vehicle dynamics controller for an 8 x 8 heavy combat vehicle utilising both torque vectoring and third and fourth axle steering is propoed. The control scheme is composed of two controllers: a feedforward zero side slip (ZSS) controller actuates the third and fourth axle steering angles and a …
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Electric Machine Differential For Vehicle Traction Control And Stability Control
… of the hybrid electric (HEV) and full electric vehicle (EV) technology. Different configurations of EV and HEV architectures are evaluated for their performance. The future technology is trending towards utilizing distinctive properties in electric machines to not only to improve efficiency but …
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Modifiable Stability and Maneuverability of High Speed Unmanned Underwater Vehicles (UUVs) Through Bioinspired Control Fins
Underwater Vehicles generally have control fins located only near their aft end, for making controllable changes in directions. This design allows for stability of control; but, the turns are typically large in comparison to the vehicle’s body length. Some bony fish, such as tuna, however, have …
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Modeling and performance analysis of ABS systems with nonlinear control
… the nonlinear Yaw-plane Four-wheel steering vehicle model with Limited Roll motion (YFLR) incorporating the nonlinear Magic Formula tire model (MF). Similar maneuvers are applied to the same vehicle model that is equipped with the conventional PID controller. Braking and vehicle stability …
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Laboratory and Numerical Investigation for the Mobility of Ground Vehicles on Soft Clay
The mobility of ground vehicles on soft, fine-grained soils is hindered by low traction and reduced load-bearing capacity, posing significant challenges for heavy-duty vehicles, such as military transport and construction equipment. Enhancing vehicle stability on these terrains is essential for …
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Adaptive control of hypersonic vehicles in presence of actuation uncertainties
… of adaptive controllers that guarantee global stability in presence of actuation uncertainties. Actuation uncertainties culminate to linear plants with a partially known input matrix B. Currently available multivariable adaptive controllers yield global stability only when the input matrix B is …
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Tire Contact Patch Characterization through Finite Element Modeling and Experimental Testing
… conditions is essential to optimizing tire and vehicle performance. The footprint shape and stress distribution pattern are very important factors that go into assessing the tire's rate of wear, the vehicle's fuel economy and has a major effect on the vehicle stability and control, especially …
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