Relative Performance Analyses Of Articulated Vehicles With Multiple Conventional Liftable And Self Steering Axles
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Relative Performance Analyses Of Articulated Vehicles With Multiple Conventional Liftable And Self Steering Axles
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Author : Sheng Luo
language : en
Publisher:
Release Date : 2004
Relative Performance Analyses Of Articulated Vehicles With Multiple Conventional Liftable And Self Steering Axles written by Sheng Luo 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.
Directional Dynamic Analysis Of An Articulated Vehicle With Articulation Dampers And Forced Steering
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Author : Rama Krishna Vallurupalli
language : en
Publisher:
Release Date : 1993
Directional Dynamic Analysis Of An Articulated Vehicle With Articulation Dampers And Forced Steering written by Rama Krishna Vallurupalli and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 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.
Asme Technical Papers
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Author :
language : en
Publisher:
Release Date : 1979
Asme Technical Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Mechanical engineering categories.
Performance Analysis And Testing Of A Conventional Three Piece Freight Car Truck Retrofitted To Provide Axle Steering
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Author : Pierre P. Marcotte
language : en
Publisher:
Release Date : 1978
Performance Analysis And Testing Of A Conventional Three Piece Freight Car Truck Retrofitted To Provide Axle Steering written by Pierre P. Marcotte and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Freight cars categories.
Cumulative Index Of The Sae Papers
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Author : Society of Automotive Engineers
language : en
Publisher:
Release Date : 1965
Cumulative Index Of The Sae Papers written by Society of Automotive Engineers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Engineering categories.
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.
Paper
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Author :
language : en
Publisher:
Release Date : 1979
Paper written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Mechanical engineering 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.
Track Design Handbook For Light Rail Transit
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Author :
language : en
Publisher: Transportation Research Board
Release Date : 2012
Track Design Handbook For Light Rail Transit written by and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Technology & Engineering categories.
TCRP report 155 provides guidelines and descriptions for the design of various common types of light rail transit (LRT) track. The track structure types include ballasted track, direct fixation ("ballastless") track, and embedded track. The report considers the characteristics and interfaces of vehicle wheels and rail, tracks and wheel gauges, rail sections, alignments, speeds, and track moduli. The report includes chapters on vehicles, alignment, track structures, track components, special track work, aerial structures/bridges, corrosion control, noise and vibration, signals, traction power, and the integration of LRT track into urban streets.