Directional Stability And Control Of Articulated Heavy Trucks
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Directional Stability And Control Of Articulated Heavy Trucks
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Author : P. Fancher
language : en
Publisher:
Release Date : 1984
Directional Stability And Control Of Articulated Heavy Trucks 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 1984 with categories.
From the conference: International ICTS School of Applied Dynamics Advanced Vehicle System Dynamics 2nd Course, 28 May-1 June 1984, Amalfi, Italy.
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.
High Speed Lateral Stability Analysis Of Articulated Heavy Vehicles Using Driver In The Loop Real Time Simulation
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Author : Jesse Brown
language : en
Publisher:
Release Date : 2018
High Speed Lateral Stability Analysis Of Articulated Heavy Vehicles Using Driver In The Loop Real Time Simulation written by Jesse Brown 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.
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.
Fractional Order State Feedback Control For Improved Lateral Stability Of Semi Autonomous Commercial Heavy Vehicles
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Author : Rasheed Mazen Abdulkader
language : en
Publisher:
Release Date : 2019
Fractional Order State Feedback Control For Improved Lateral Stability Of Semi Autonomous Commercial Heavy Vehicles written by Rasheed Mazen Abdulkader and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Automated vehicles categories.
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.
Influence Of Size And Weight Variables On The Stability And Control Properties Of Heavy Trucks
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Author : R.D. Ervin, R.L. Nisonger, M.Savers, T.D. Gillespie, P.S. Francher
language : en
Publisher:
Release Date : 1983
Influence Of Size And Weight Variables On The Stability And Control Properties Of Heavy Trucks written by R.D. Ervin, R.L. Nisonger, M.Savers, T.D. Gillespie, P.S. Francher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Vehicle Dynamics And Control
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Author : Shahram Azadi
language : en
Publisher: Elsevier
Release Date : 2021-03-25
Vehicle Dynamics And Control written by Shahram Azadi and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-03-25 with Technology & Engineering categories.
Vehicle Dynamics and Control: Advanced Methodologies features the latest information on advanced dynamics and vehicle motion control, including a comprehensive overview of passenger cars and articulated vehicles, fundamentals, and emerging developments. This book provides a unified, balanced treatment of advanced approaches to vehicle dynamics and control. It proceeds to cover advanced vehicle control strategies, such as identification and estimation, adaptive nonlinear control, new robust control techniques, and soft computing. Other topics, such as the integrated control of passenger cars and articulated heavy vehicles, are also discussed with a significant amount of material on engineering methodology, simulation, modeling, and mathematical verification of the systems. This book discusses and solves new challenges in vehicle dynamics and control problems and helps graduate students in the field of automotive engineering as well as researchers and engineers seeking theoretical/practical design procedures in automotive control systems. Provides a vast spectrum of advanced vehicle dynamics and control systems topics and current research trends Provides an extensive discussion in some advanced topics on commercial vehicles, such as dynamics and control of semitrailer carrying liquid, integrated control system design, path planning and tracking control in the autonomous articulated vehicle
Influence Of Size And Weight Variables On The Stability And Control Properties Of Heavy Trucks
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Author : R.D. Ervin, R.L. Nisonger, C.C. MacAdam, P.S. Fancher
language : en
Publisher:
Release Date : 1983
Influence Of Size And Weight Variables On The Stability And Control Properties Of Heavy Trucks written by R.D. Ervin, R.L. Nisonger, C.C. MacAdam, P.S. Fancher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 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.
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.
Directional Stability Of Articulated Vehicle
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Author : Orhan Daldal
language : tr
Publisher:
Release Date : 1966
Directional Stability Of Articulated Vehicle written by Orhan Daldal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.