Enhancing Roll Stability And Directional Performance Of Articulated Heavy Vehicles Based On Anti Roll Control And Design Optimization
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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.
Active Anti Roll Bar Control Design For Heavy Vehicles
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Author : Vu Van Tan
language : en
Publisher: Springer Nature
Release Date :
Active Anti Roll Bar Control Design For Heavy Vehicles written by Vu Van Tan and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Enhancement Of Ride And Directional Performances Of Articulated Vehicles Via Optimal Frame Steering And Hydro Pneumatic Suspension
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Author : Yuming Yin
language : en
Publisher:
Release Date : 2018
Enhancement Of Ride And Directional Performances Of Articulated Vehicles Via Optimal Frame Steering And Hydro Pneumatic Suspension written by Yuming Yin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Off-road vehicles employed in agriculture, construction, forestry and mining sectors are known to exhibit comprehensive levels of terrain-induced ride vibration and relatively lower directional stability limits, especially for the articulated frame-steered vehicles (AFSV). The transmitted whole-body vibration (WBV) exposure levels to the human operators generally exceed the safety limits defined in ISO-2631-1 and the European Community guidelines. Moreover, the directional stability limits are generally assessed neglecting the contributions due to terrain roughness and kineto-dynamics of the articulated frame steering (AFS) system. Increasing demand for high load capacity and high-speed off-road vehicles raises greater concerns for both the directional stability limits and WBV exposure. The criterion for acceptable handling and stability limits of such vehicles do not yet exist and need to be established. Furthermore, both directional stability performance and ride vibration characteristics are coupled and pose conflicting vehicle suspension design requirements. This dissertation research focuses on enhancement of ride, and roll- and yaw-plane stability performance measures of frame-steered vehicle via analysis of kineto-dynamics of the AFS system and hydro-pneumatic suspensions. A roll stability performance measure is initially proposed for off-road vehicles considering magnitude and spectral contents of the terrain elevations. The roll dynamics of an off-road vehicle operating on random rough terrains were investigated, where the two terrain-track profiles were synthesized considering coherency between them. It is shown that a measure based on steady-turning root-mean-square lateral acceleration corresponding to the sustained period of unity lateral-load-transfer-ratio prior to the absolute-rollover, could serve as a reliable measure of roll stability of vehicles operating on random rough terrains. The simulation results revealed adverse effects of terrain elevation magnitude on the roll stability, while a relatively higher coherency resulted in lower terrain roll-excitation and thereby higher roll stability. The yaw-plane stability limits of an AFSV are investigated in terms of free yaw-oscillations as well as transient steering characteristics through field measurements and simulations of kineto-dynamics of the AFS system. It was shown that employing hydraulic fluid with higher bulk modulus and increasing the steering arm lengths would yield higher yaw stiffness of the AFS system and thereby higher frequency of yaw-oscillations. Greater leakage flows and viscous seal friction within the AFS system struts caused higher yaw damping coefficient but worsened the steering gain and articulation rate. A design guidance of the AFS system is subsequently proposed. The essential objective measures are further identified considering the AFSV's yaw oscillation/stability and steering performances, so as to seek an optimal design of the AFS system. For enhancing the ride performance of AFSV, a simple and low cost design of a hydro-pneumatic suspension (HPS) is proposed. The nonlinear stiffness and damping properties of the HPS strut that permits entrapment of gas into the hydraulic oil were characterized experimentally and analytically. The formation of the gas-oil emulsion was studied in the laboratory, and variations in the bulk modulus and mass density of the emulsion were formulated as a function of the gas volume fraction. The model results obtained under different excitations in the 0.1 to 8 Hz frequency range showed reasonably good agreements with the measured stiffness and damping properties of the HPS strut. The results showed that increasing the fluid compressibility causes increase in effective stiffness but considerable reduction in the damping in a highly nonlinear manner. Increasing the gas volume fraction resulted in substantial hysteresis in the force-deflection and force-velocity characteristics of the strut. A three-dimensional AFSV model is subsequently formulated integrating the hydro-mechanical AFS system and a hydro-pneumatic suspension. The HPS is implemented only at the front axle, which supports the driver cabin in order to preserve the roll stability of the vehicle. The validity of the model is illustrated through field measurements on a prototype vehicle. The suspension parameters are selected through design sensitivity analyses and optimization, considering integrated ride vibration, and roll- and yaw-plane stability performance measures. The results suggested that implementation of HPS to the front unit alone could help preserve the directional stability limits compared to the unsuspended prototype vehicle and reduce the ride vibration exposure by nearly 30%. The results of sensitivity analyses revealed that the directional stability performance limits are only slightly affected by the HPS parameters. Further reduction in the ride vibration exposure was attained with the optimal design, irrespective of the payload variations.
Enhancing The Roll Stability Of Heavy Vehicles By Using An Active Anti Roll Bar System
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Author : Van Tan Vu
language : en
Publisher:
Release Date : 2017
Enhancing The Roll Stability Of Heavy Vehicles By Using An Active Anti Roll Bar System written by Van Tan Vu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Vehicle rollover is a very serious problem for the safety of heavy vehicles. Most modern heavy vehicles are equipped with passive anti-roll bars, however they may be not sufficient to overcome critical situations. This thesis focuses on the active anti-roll bar system, which is the most common method used to improve roll stability of heavy vehicles.The thesis research work is divided into three main parts. In the first part, an integrated model is proposed with four electronic servo-valve hydraulic actuators mounted in a linear yaw-roll model of a single unit heavy vehicle. In the second part, the active anti-roll bar system uses two control approaches in the LTI framework: LQR, Hinfty. In the third part, the grid-based LPV approach is used to synthesize the Hinfty/LPV active anti-roll bar controller with parameter dependant weighting functions, by using LPVTools.The simulation results, in the frequency and time domains, as well as the validation by using the TruckSim simulation software, show that the active anti-roll bar control is a realistic and efficient solution which drastically improves roll stability of a single unit heavy vehicle, compared to the passive anti-roll bar.
Parallel Design Optimization Of Multi Trailer Articulated Heavy Vehicles With Active Safety Systems
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Author : Md. Manjurul Islam
language : en
Publisher:
Release Date : 2013
Parallel Design Optimization Of Multi Trailer Articulated Heavy Vehicles With Active Safety Systems written by Md. Manjurul Islam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Ride And Directional Dynamic Analysis Of Articulated Frame Steer Vehicles
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Author : Alireza Pazooki
language : en
Publisher:
Release Date : 2012
Ride And Directional Dynamic Analysis Of Articulated Frame Steer Vehicles written by Alireza Pazooki 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.
Dynamic Stability And Control Of Tripped And Untripped Vehicle Rollover
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Author : Zhilin Jin
language : en
Publisher: Springer Nature
Release Date : 2022-06-01
Dynamic Stability And Control Of Tripped And Untripped Vehicle Rollover written by Zhilin Jin and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-01 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.
Directional Performance Issues In Evaluation And Design Of Articulated Heavy Vehicles
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Author : P. Fancher
language : en
Publisher:
Release Date : 2007
Directional Performance Issues In Evaluation And Design Of Articulated Heavy Vehicles written by P. Fancher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Tractor trailer combinations categories.
Vehicle Mechatronics And Information Technologies
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Author : X.D. Yu
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2013-08-30
Vehicle Mechatronics And Information Technologies written by X.D. Yu and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-08-30 with Technology & Engineering categories.
Collection of selected, peer reviewed papers from the 2013 International Conference on Vehicle & Mechanical Engineering and Information Technology (VMEIT 2013), August 17-18, 2013, Zhengzhou, Henan, China. The 1094 papers are grouped as follows: Chapter 1: Design and Researches in Area of Vehicle and General Mechanical Engineering; Chapter 2: Mechatronics, Automation and Control; Chapter 3: Measurement and Instrumentation, Monitoring and Detection Technologies, Fault Diagnosis; Chapter 4: Computation Methods and Algorithms for Modeling, Simulation and Optimization, Data Mining and Data Processing; Chapter 5: Information Technologies, WEB and Networks Engineering, Information Security, Software Application and Development; Chapter 6: Power and Electric Systems, Electronics and Microelectronics, Embedded and Integrated Systems; Chapter 7: Communication, Signal and Image Processing, Data Acquisition, Identification and Recognition Technologies; Chapter 8: Information Technologies in Urban and Civil Engineering, Medicine and Biotechnology; Chapter 9: Material Science and Manufacturing Technology; Chapter 10: Information Technology in Management Engineering, Logistics, Economics, Finance, Assessment; Chapter 11: Related Themes.
Dynamic Stability And Control Of Tripped And Untripped Vehicle Rollover
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Author : Zhilin Jin
language : en
Publisher:
Release Date : 2019-05-30
Dynamic Stability And Control Of Tripped And Untripped Vehicle Rollover written by Zhilin Jin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-30 with 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.