Assessing benefits of coordination on safety in automated highway systems
Abstract
Safety is one of the critical issues in the design of an Automated Highway System (AHS). In this thesis, we are interested in intervehicular collisions in automated vehicle platoons. Specifically, we consider collisions arising from a maneuver where the lead vehicle brakes at its maximum possible deceleration. The quantities that are of interest are severity of impact in terms of relative velocity at impact, probability of a collision, and expected number of collisions. We are interested in exploring how coordination during braking improves safety in these three categories. In addition, we have considered sensor/communication failures and actuator failures on vehicles and how they result in collision. What we are seeking for this failure mode are classification of sensor/communication failures according to their severity and time to collision which provides an upper bound on the time available for failure detection. These two things depend upon the desired intervehicular spacing distance between vehicles and coefficient of restitution. These tasks, in this thesis, are based on simulation study combined with analytical study. Monte Carlo simulation with distribution of braking from Godbole and Lygeros [1] is performed to show assessment of the benefits of coordination while braking in terms of a reduction in the probability of a collision, the expected number of collisions, and severity of impact in terms of relative velocity of impact. And failure modes, which are sensor/communication and actuator failure, are simulated using "comb-sim simulation software" developed by the University of California at Berkeley.
Description
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Includes bibliographical references (leaf 67).
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references (leaf 67).
Issued also on microfiche from Lange Micrographics.
Keywords
mechanical engineering., Major mechanical engineering.