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Title:On simulation based verification of nonlinear nondeterministic hybrid systems
Author(s):Huang, Zhenqi
Advisor(s):Mitra, Sayan
Department / Program:Mechanical Sci & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):hybrid system
verification
differential inclusion
simulation
Abstract:Automatic safety verification of hybrid systems typically involves computing precise reach sets of such systems. This computation limits scalability of verification as for many model classes it scales exponentially with the number of continuous variables. First we propose a simulation-based algorithm for computing the reach set of a class of deterministic hybrid system. The algorithm first constructs a cover of the initial set of the hybrid system. Then the reach set of executions from the same cover are overapproximated by simulation traces and tubes around them. Experiments are performed on several benchmark problems including navigation benchmarks, room heating benchmarks, non-linear satellite systems and engine hybrid control systems. The results suggest the algorithm may scale to larger systems. Finally, we present a reachability algorithm that computes precise reach set of dynamical systems $A$ with non-linear differential inclusions. The algorithm constructs a sequence of shrink concretizations of $A$. Then the reach sets of the concretizations are used to construct an overapproximation of the reach set of $A$. Soundness and Completeness of both algorithms presented are formally proved.
Issue Date:2013-08-22
URI:http://hdl.handle.net/2142/45481
Rights Information:Copyright 2013 Zhenqi Huang
Date Available in IDEALS:2013-08-22
Date Deposited:2013-08


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