Memorial University DAI: Preview active suspension design for convoy vehicles

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Document Description

Title	Preview active suspension design for convoy vehicles
Author	Adibi asl, Hadi.
Description	Thesis (M.Eng.)--Memorial University of Newfoundland, 2009. Engineering and Applied Science
Date	2009
Pagination	xvi, 114 leaves : ill. (some col.)
Subject	Automobiles--Springs and suspension; Vehicles, Military--Motors--Control systems
Degree	M.Eng.
Degree Grantor	Memorial University of Newfoundland. Faculty of Engineering and Applied Science
Discipline	Engineering and Applied Science
Language	Eng
Notes	Includes bibliographical references (leaves 105-109)
Abstract	Convoy vehicles, defined as individual vehicles traveling with close following distances on a specified path, have been recently the subject of research especially in military applications. Convoy vehicles are used to carry soldiers, weapons and army supplements. Military drivers are often young and inexperienced, and more prone to lose control of vehicles on rough terrain. In addition, Intelligent Vehicle Highway Systems with autonomous civilian vehicles travelling in platoons are an active research and experimentation topic. -- The idea of communicating dynamic responses between preceding and following vehicles, to improve the followers' ride comfort and handling, has been identified as a research need for convoy vehicle systems. -- This research implements a form of preview control to improve the vertical dynamics of convoy vehicles. An academic virtual convoy, composed of a lead vehicle with active suspension system, and a follower vehicle with preview-controlled active suspension, is developed in MATLAB and SIMULINK. Preview control gives a theoretical improvement over active control by further decreasing sprung mass acceleration (ride quality) and/or improving road holding. Quarter car models with two degrees of freedom (DOF) are employed for modeling and simulation. In contrast to conventional preview control with look-ahead sensors, the vertical response states of the lead vehicle are used to generate feed forward control gains in addition to feedback control gains for the preview controller of the follower vehicle. The results show improved ride comfort and road holding of the follower vehicle with the novel preview approach compared to a lead vehicle with active suspension. Moreover, the power demand for the follower vehicle suspension is much less than for the lead vehicle. Longitudinal dynamics of a convoy system, with five vehicles, are evaluated and an adaptive cruise control system is implemented to control the longitudinal aspects of the convoy such as relative space and velocity among vehicles. Future work will implement the state-based preview controller into such a convoy, with variations in following distance, to test the robustness of the method.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	a3242390
Rights	The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(11.5 MB) -- http://collections.mun.ca/PDFs/theses/Asl_HadiAdibi.pdf
CONTENTdm file name	72795.cpd