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 80 for “"rollover"”.
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Cost Effective Rollover Mitigation Strategy
A cost effective method of rollover mitigation in vehicles is presented. The method was designed so that some of the system states were measured by sensors that are already available on most vehicles and so that other states could be measured with relatively low cost sensors. Also, the control …
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Vehicle Dynamics Control for Rollover Prevention
Vehicle rollover accidents are a particularly dangerous form of road accident. Existing vehicle dynamics controllers primarily deal with yaw stability, and are of limited use for dealing with problems of roll instability. This thesis deals with the development of a new type of vehicle dynamics …
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Simulation analysis of anti-rollover mechanism for vehicles
Rollover accidents are considered the most significant safety problems for all classes of light vehicles, especially pickups, Sport Utility Vehicles (SUV), Light Truck Vehicle (LTV) and vans. The main objective of the research is the design of a new mechanism able to keep the vehicle stable under …
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Advanced generation NIOSH automatically deployable rollover protective structure (AutoROPS)
… withstand the impact loads associated with the rollover of any farm tractor. Another purpose of the investigation is to design a new generation of the AutoROPS that is smaller and cost effective. Using ANSYS software for Finite Element Analysis (FEA) simulated the new design. The results …
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Soft Surface Roll Mechanics Parameters for Light Vehicle Rollover Accident Reconstruction
Light vehicle rollover accidents on soft surfaces can be modeled assuming constant drag with linear motion equations and other engineering principles. The concept of using segment average results to evaluate roll mechanics parameters throughout a roll sequence, and specifically, segment duration to …
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Adaptive Rollover Control Algorithm Based on an Off-Road Tire Model
Due to a recent number of undesired rollovers in the field for the studied vehicle, rollover mitigation strategies have been investigated and developed. This research begins with the study of the tire, as it is the single component on the vehicle responsible for generating all of the non-inertial …
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Characterisation and investigation of serious thoracic injuries in passenger vehicle rollover crashes
Passenger vehicle rollover crashes involving a single vehicle occur infrequently; however, when they do the vehicle occupants in these crashes are more likely to sustain serious and fatal injuries compared to other crash modes. The thorax is frequently seriously injured in rollover crashes. Ongoing …
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Analysis, detection and early warning control of dynamic rollover of heavy freight vehicles
… criteria are initially derived from the rollover mechanics of different heavy vehicle combinations. The relative roll instability conditions are evaluated under steady cornering maneuvers through development and analysis of static roll plane models. The sensitivity of the static rollover …
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Topics in Automotive Rollover Prevention: Robust and Adaptive Switching Strategies for Estimation and Control
… Of particular importance is the problem rollover prevention, which is an important problem plaguing vehicles with a high center of gravity (CG). Vehicle rollover is, statistically, the most dangerous accident type, and it is difficult to prevent it due to the time varying nature of the …
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Rollover prevention and path following of a scaled autonomous vehicle using nonlinear model predictive control
… be distinguished: the yaw-rate instability, the rollover and the jack-knife phenomenon. The main goal of this study is to develop a yaw-rate and rollover stability controller of an Autonomous Scaled Ground Vehicle (ASGV) using Nonlinear Model Predictive Control (NMPC). Open Source Software (OSS) …
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Residual Crashes and Injured Occupants with Lane Departure Prevention Systems
… vehicle crash fatalities involved a vehicle rollover [1]. Half of all fatal single vehicle road departure crashes resulted in a rollover yet only 12% of fatal multi-vehicle crashes involved a rollover [1]. These often occur after the driver has lost control of the vehicle and departed the …
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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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Investigation of Quad Bike Rollovers in the Workplace Farm Environment
… of quad bike crashes, specifically how rollover crashes occur in the workplace. It has been hypothesised that quad bikes ridden by a rider who is preoccupied by the work task are particularly susceptible to rollover caused by small asymmetric bumps (i.e. placed in line with the wheels on …
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Stability analysis of partially filled tanker trucks using a finite element modeling approach
The point of rollover for a tanker truck carrying fluid cargo is of great importance due to the catastrophic nature of accidents involving such vehicles. Payloads are often toxic or flammable, thus, predicting the threshold of rollover effectively is of great value. Furthermore, the liquid load …
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Experimental Evaluation of Roll Stability Control System Effectiveness for A-double Commercial Trucks
… Commercial trucks are more susceptible to rollovers than passenger cars because of their higher center of gravity relative to their track width. Multi-trailer articulated heavy vehicles, such as A-doubles, are particularly prone to rollovers because of their articulation and rearward …
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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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Dynamic stability of an elliptical pendulum with unilateral simple supports
The study of rollover stability of partially filled tanker trucks often requires the use of mechanical pendulums to substitute the sloshing dynamics of the fluid. Cylindrical tanks have been effectively characterized by simple pendulums combined with some fixed masses. Just recently, a WVU team …
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Three essays on debt pricing
… The Effect of Risky Bond Yield Curve on Optimal Rollover Strategy This chapter studies how firms can exploit the risky bond yield curve (treasury yield curve plus term structure of credit spread) to manage the maturity profile of new debt issuance. In contrast to existing literature, I \emph{shut …
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Serious and Fatal Injury Risk in Road Departure Crashes with Guardrail
… protocol, compared to non-compliant designs. Rollover occurred in 10 % of all frontal guardrail crashes, and was initiated by the guardrail in roughly 46 % of instances. The evidence indicates that end terminal contact increases rollover odds by 6.9 times compared to guardrail face contact for …
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Experimental Evaluation of the Dynamic Performance Benefits of Roll Stability Control Systems on A-train Doubles
… with different maneuvers and speeds until a rollover occurs or the vehicle is deemed to be unstable. The maneuvers that are used for the tests include: double lane change, sine-with-dwell, J-turn, and ramp steer maneuver. Both a steering robot and subjective driver are used for the tests. The …
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