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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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Book Synopsis Enhancing Roll Stability and Directional Performance of Articulated Heavy Vehicles Based on Anti-roll Control and Design Optimization by : Dhruv Oberoi
Download or read book Enhancing Roll Stability and Directional Performance of Articulated Heavy Vehicles Based on Anti-roll Control and Design Optimization written by Dhruv Oberoi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Active Anti-Roll Bar Control Design for Heavy Vehicles by : Vu Van Tan
Download or read book Active Anti-Roll Bar Control Design for Heavy Vehicles written by Vu Van Tan and published by Springer Nature. This book was released on with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancement of Ride and Directional Performances of Articulated Vehicles Via Optimal Frame Steering and Hydro-Pneumatic Suspension by : Yuming Yin
Download or read book Enhancement of Ride and Directional Performances of Articulated Vehicles Via Optimal Frame Steering and Hydro-Pneumatic Suspension written by Yuming Yin and published by . This book was released on 2018 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Parallel Design Optimization of Multi-trailer Articulated Heavy Vehicles with Active Safety Systems by : Md. Manjurul Islam
Download or read book Parallel Design Optimization of Multi-trailer Articulated Heavy Vehicles with Active Safety Systems written by Md. Manjurul Islam and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancing the Roll Stability of Heavy Vehicles by Using an Active Anti-roll Bar System by : Van Tan Vu
Download or read book Enhancing the Roll Stability of Heavy Vehicles by Using an Active Anti-roll Bar System written by Van Tan Vu and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Directional Performance Issues in Evaluation and Design of Articulated Heavy Vehicles by : P. Fancher
Download or read book Directional Performance Issues in Evaluation and Design of Articulated Heavy Vehicles written by P. Fancher and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ride and Directional Dynamic Analysis of Articulated Frame Steer Vehicles by : Alireza Pazooki
Download or read book Ride and Directional Dynamic Analysis of Articulated Frame Steer Vehicles written by Alireza Pazooki and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vehicle, Mechatronics and Information Technologies by : X.D. Yu
Download or read book Vehicle, Mechatronics and Information Technologies written by X.D. Yu and published by Trans Tech Publications Ltd. This book was released on 2013-08-30 with total page 5174 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Dynamic Stability and Control of Tripped and Untripped Vehicle Rollover by : Zhilin Jin
Download or read book Dynamic Stability and Control of Tripped and Untripped Vehicle Rollover written by Zhilin Jin and published by Springer Nature. This book was released on 2022-06-01 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Proceedings of the ... American Control Conference by :
Download or read book Proceedings of the ... American Control Conference written by and published by . This book was released on 1998 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Controller Design for Stability and Rollover Prevention of Multi-body Ground Vehicles with Uncertain Dynamics and Faults by : Hsun-Hsuan Huang
Download or read book Controller Design for Stability and Rollover Prevention of Multi-body Ground Vehicles with Uncertain Dynamics and Faults written by Hsun-Hsuan Huang and published by . This book was released on 2009 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Advanced Vehicle Technologies written by and published by . This book was released on 2001 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Directional Stability and Control of Articulated Heavy Trucks by : P. Fancher
Download or read book Directional Stability and Control of Articulated Heavy Trucks written by P. Fancher and published by . This book was released on 1984 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the conference: International ICTS School of Applied Dynamics Advanced Vehicle System Dynamics 2nd Course, 28 May-1 June 1984, Amalfi, Italy.
Book Synopsis Design Synthesis of Articulated Heavy Vehicles with Active Trailer Steering Systems by : Md. Manjurul Islam
Download or read book Design Synthesis of Articulated Heavy Vehicles with Active Trailer Steering Systems written by Md. Manjurul Islam and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Stability and Control of Tripped and Untripped Vehicle Rollover by : Zhilin Jin
Download or read book Dynamic Stability and Control of Tripped and Untripped Vehicle Rollover written by Zhilin Jin and published by . This book was released on 2019-05-30 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Fractional Order State Feedback Control for Improved Lateral Stability of Semi-autonomous Commercial Heavy Vehicles by : Rasheed Mazen Abdulkader
Download or read book Fractional Order State Feedback Control for Improved Lateral Stability of Semi-autonomous Commercial Heavy Vehicles written by Rasheed Mazen Abdulkader and published by . This book was released on 2019 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the growing development of autonomous and semi-autonomous large commercial heavy vehicles, the lateral stability control of articulated vehicles have caught the attention of researchers recently. Active vehicle front steering (AFS) can enhance the handling performance and stability of articulated vehicles for an emergency highway maneuver scenario. However, with large vehicles such tractor-trailers, the system becomes more complex to control and there is an increased occurrence of instabilities. This research investigates a new control scheme based on fractional calculus as a technique that ensures lateral stability of articulated large heavy vehicles during evasive highway maneuvering scenarios. The control method is first implemented to a passenger vehicle model with 2-axles based on the well-known “bicycle model”. The model is then extended and applied onto larger three-axle commercial heavy vehicles in platooning operations. To validate the proposed new control algorithm, the system is linearized and a fractional order PI state feedback control is developed based on the linearized model. Then using Matlab/Simulink, the developed fractional-order linear controller is implemented onto the non-linear tractor-trailer dynamic model. The tractor-trailer system is modeled based on the conventional integer-order techniques and then a non-integer linear controller is developed to control the system. Overall, results confirm that the proposed controller improves the lateral stability of a tractor-trailer response time by 20% as compared to a professional truck driver during an evasive highway maneuvering scenario. In addition, the effects of variable truck cargo loading and longitudinal speed are evaluated to confirm the robustness of the new control method under a variety of potential operating conditions.
Book Synopsis High-speed Lateral Stability Analysis of Articulated Heavy Vehicles Using Driver-in-the-loop Real Time Simulation by : Jesse Brown
Download or read book High-speed Lateral Stability Analysis of Articulated Heavy Vehicles Using Driver-in-the-loop Real Time Simulation written by Jesse Brown and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-speed testing procedures for evaluating the lateral stability of multi-trailer articulated heavy vehicles (MTAHV) include the use of both an open-loop and a closed-loop maneuvers as specified in ISO-14791. The standard testing procedures are used to determine the Rearward Amplification (RA), which is a well-accepted performance measure for the lateral stability of MTAHVs. The open-loop testing maneuver includes the use of a single cycle sinewave steer input, while the closed-loop procedure prescribes a single lane-change path, following which a driver drives a testing vehicle. The closed-loop single lane-change maneuver can be performed by a human driver for in-vehicle tests. In numerical simulation, a driver model may be used to drive the virtual vehicle under the closed-loop maneuver for simplicity and repeatability. Very little attention has been paid to investigating into the interactions of driver-MTAHV. It has been reported that a driver is typically at fault in many heavy vehicle accidents, and many studies focus on improving the dynamic performance of the vehicle and ignore the driving skills of the driver. This thesis attempts to examine the driver-MTAHV interactions and quantify driver skills for controlling a MTAHV as compared to a single unit vehicle. This thesis proposes a method for driver skill analysis via comparing virtual drivers in various operating conditions. The driver skill analysis is conducted by evaluating the lateral stability and path-following ability of the vehicle under the control of the driver model. The evaluation is implemented using driver-in-the-loop (DIL) real-time simulations, where the RA measures derived from a group of human drivers are compared to those from the virtual driver. The numerical and DIL real-time simulation results demonstrate that the human and the virtual driver achieved similar a good agreement in terms of the performance measures, indicating the validity of the driver model, testing procedure and the interactions of driver-MTAHV.
