Rollover Prevention Of Articulated Vehicles Through Predictive Warning Of Impending Roll Instability
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Rollover Prevention Of Articulated Vehicles Through Predictive Warning Of Impending Roll Instability
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Author : Sandeep Kar
language : en
Publisher:
Release Date : 2004
Rollover Prevention Of Articulated Vehicles Through Predictive Warning Of Impending Roll Instability written by Sandeep Kar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Analysis Detection And Early Warning Control Of Dynamic Rollover Of Heavy Freight Vehicles
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Author :
language : en
Publisher:
Release Date : 1999
Analysis Detection And Early Warning Control Of Dynamic Rollover Of Heavy Freight Vehicles written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Dynamic Stability And Control Of Tripped And Untripped Vehicle Rollover
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Author : Zhilin Jin
language : en
Publisher: Morgan & Claypool Publishers
Release Date : 2019-05-30
Dynamic Stability And Control Of Tripped And Untripped Vehicle Rollover written by Zhilin Jin and has been published by Morgan & Claypool Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-30 with Technology & Engineering categories.
Vehicle rollover accidents have been a serious safety problem for the last three decades. Although rollovers are a small percentage of all traffic accidents, they do account for a large proportion of severe and fatal injuries. Specifically, some large passenger vehicles, such as large vans, pickup trucks, and sport utility vehicles, are more prone to rollover accidents with a high center of gravity (CG) and narrow track width. Vehicle rollover accidents may be grouped into two categories: tripped and untripped rollovers. A tripped rollover commonly occurs when a vehicle skids and digs its tires into soft soil or hits a tripping mechanism such as a curb with a sufficiently large lateral velocity. On the other hand, the untripped rollover is induced by extreme maneuvers during critical driving situations, such as excessive speed during cornering, obstacle avoidance, and severe lane change maneuver. In these situations, the forces at the tire-road contact point are large enough to cause the vehicle to roll over. Furthermore, vehicle rollover may occur due to external disturbances such as side-wind and steering excitation. Therefore, it is necessary to investigate the dynamic stability and control of tripped and untripped vehicle rollover so as to avoid vehicle rollover accidents. In this book, different dynamic models are used to describe the vehicle rollover under both untripped and special tripped situations. From the vehicle dynamics theory, rollover indices are deduced, and the dynamic stabilities of vehicle rollover are analyzed. In addition, some active control strategies are discussed to improve the anti-rollover performance of the vehicle.
On The Estimation Of Center Of Gravity Height Of Arbitrarily Loaded Articulated Freight Vehicle
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Author : Feng Yang
language : en
Publisher:
Release Date : 2005
On The Estimation Of Center Of Gravity Height Of Arbitrarily Loaded Articulated Freight Vehicle written by Feng Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Vehicle Control For Collision Avoidance And Rollover Prevention Using The Zero Moment Point
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Author : Paul Stankiewicz
language : en
Publisher:
Release Date : 2015
Vehicle Control For Collision Avoidance And Rollover Prevention Using The Zero Moment Point written by Paul Stankiewicz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
This thesis investigates vehicle control techniques for rollover prevention in a collision avoidance scenario. The zero-moment point (ZMP) is used to evaluate the vehicle's current and near-future rollover propensity with the purpose of predicting and correcting an impending rollover event. Low-order vehicle models inclusive of roll dynamics and terrain effects are utilized to facilitate rapid, but accurate, calculation of the vehicle's current and predicted rollover threat. Results found in this thesis show that short-range predictions, ranging from 0.1 seconds to 0.7 seconds, are sufficient to prevent nearly all dynamics-induced rollovers in typical highway curves. These results are useful in determining an appropriate preview horizon for predictive control techniques aimed at rollover prevention. This thesis also investigates the minimum intervention distance needed in a collision avoidance scenario to avoid an obstacle while also preventing wheel lift. Subsequently, a linear-quadratic output regulator is designed to safely navigate thevehicle through a collision avoidance maneuver, while employing a feedback scheme that explicitly accounts for rollover prevention.
Enhancing Roll Stability And Directional Performance Of Articulated Heavy Vehicles Based On Anti Roll Control And Design Optimization
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Author : Dhruv Oberoi
language : en
Publisher:
Release Date : 2012
Enhancing Roll Stability And Directional Performance Of Articulated Heavy Vehicles Based On Anti Roll Control And Design Optimization written by Dhruv Oberoi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Controller Design For Stability And Rollover Prevention Of Multi Body Ground Vehicles With Uncertain Dynamics And Faults
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Author : Hsun-Hsuan Huang
language : en
Publisher:
Release Date : 2009
Controller Design For Stability And Rollover Prevention Of Multi Body Ground Vehicles With Uncertain Dynamics And Faults written by Hsun-Hsuan Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Abstract: Rollover prevention is a fundamental and significant issue for vehicle safety research. Passenger and commercial vehicles with a relatively high center of gravity are especially prone to rollover. Rollover is a threat especially for military vehicles, which operate in severe operational environments and maneuvers. Additional assistance from active anti-rollover control systems can mitigate the deficiency in human capability. Furthermore, the ant-rollover control systems have to accommodate perturbations in the rollover parameters (e.g., speed and road adhesion coefficient) and external disturbances (such as adverse weather and terrain conditions) and have to be fault-tolerant in order to enhance rollover prevention. Thus, with rollover prevention of military multi-body ground vehicles as the objective of this research, in this dissertation, we first propose a novel control system analysis and design technique by extending the popular Linear Quadratic Regulator (LQR) control design method specializing it for the 'control coupled output regulation' problem. Specifically, in this rollover prevention problem, a 'unified rollover index' is proposed, which captures both the roll dynamics and lateral dynamics, explicitly into the optimization procedure of the LQR framework, which results in a performance index with a coupled term in state and control variables. Thus, the proposed rollover prevention technique effectively incorporates the physical nature of the vehicle dynamics into the problem formulation resulting in significantly improved performance. Moreover, the proposed technique allows us to compare different controller configurations and select the most efficient controller structure in terms of both control effort as well as cost. It is shown that because of the inherent coupling the system has, sometimes it is possible that a well designed single controller (actuator) can result in better performance than multiple controllers (actuators) with improper design. The proposed methodology is illustrated with two applications in the vehicle dynamics area. In the first application, an active steering control system is designed which shows the improved roll over prevention capability of the proposed design compared to the existing designs in the literature. The second application considers a more complicated tractor semi-trailer vehicle and shows how a single active anti-roll bar system at the trailer unit gives better performance than multiple-axle actuators at tractor and trailer together with the double lane change maneuver as the external disturbance. Next the issue of robust control design to handle uncertainties in the vehicle dynamics parameters as well as component faults. Based on the theory of 'Linear interval parameter matrix families', a single robust full state feedback control gain is designed by a convex combination of the control gains designed for finite points (vertices) of the uncertain parameter space. The uncertainty in the forward speed of the vehicle and the road adhesion coefficient are considered I the he proposed robust controller design. The results show the efficacy of the proposed robust controller under the assumed perturbations. Therefore, the proposed techniques not only prevent rollover of multi-body ground vehicles with controllers of reduced control effort (which means actuator and power savings) but also guarantee the stability and performance for vehicles with uncertain dynamics and faults.
Itf Research Reports Moving Freight With Better Trucks Improving Safety Productivity And Sustainability
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Author : OECD
language : en
Publisher: OECD Publishing
Release Date : 2011-04-19
Itf Research Reports Moving Freight With Better Trucks Improving Safety Productivity And Sustainability written by OECD and has been published by OECD Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-04-19 with categories.
This report identifies potential improvements in terms of more effective safety and environmental regulation for trucks, backed by better systems of enforcement, and identifies opportunities for greater efficiency and higher productivity.
Global Waves Of Debt
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Author : M. Ayhan Kose
language : en
Publisher: World Bank Publications
Release Date : 2021-03-03
Global Waves Of Debt written by M. Ayhan Kose and has been published by World Bank Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-03-03 with Business & Economics categories.
The global economy has experienced four waves of rapid debt accumulation over the past 50 years. The first three debt waves ended with financial crises in many emerging market and developing economies. During the current wave, which started in 2010, the increase in debt in these economies has already been larger, faster, and broader-based than in the previous three waves. Current low interest rates mitigate some of the risks associated with high debt. However, emerging market and developing economies are also confronted by weak growth prospects, mounting vulnerabilities, and elevated global risks. A menu of policy options is available to reduce the likelihood that the current debt wave will end in crisis and, if crises do take place, will alleviate their impact.
Automotive Vehicle Safety
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Author : George A. Peters
language : en
Publisher: CRC Press
Release Date : 2002-08-29
Automotive Vehicle Safety written by George A. Peters and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-08-29 with Technology & Engineering categories.
Automotive Vehicle Safety is a unique academic text, practical design guide and valuable reference book. It provides information that is essential for specialists to make better-informed decisions. The book identifies and discusses key generic safety principles and their applications and includes decision-making criteria, examples and remedies. It