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arXiv 1703.05085math.OC
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离散时间多项式系统可达集的半定逼近

Semidefinite Approximations of Reachable Sets for Discrete-time Polynomial Systems

Victor Magron, Pierre-Loic Garoche, Didier Henrion, Xavier Thirioux

摘要:

考虑在一般半代数集约束下,由半代数初始条件集逼近离散时间多项式系统的可达集的问题。假设包含在一个给定的简单集,如一个盒子或椭球,我们提供了一种方法来计算认证的外部近似的可达集。所提出的方法包括建立一个层次的松弛的无穷维矩问题。在一定的假设条件下,该问题的最优值是可达集的体积,最优解是勒贝格测度对该集的约束。然后,我们可以外近似的可达集,如所需的增加次数多项式的超水平集的层次结构。对于每一个固定的次数,找到多项式的系数归结为计算凸半定规划的最优解。当多项式逼近的次数趋于无穷大时,我们给出了超水平集到可达集的强收敛保证。我们还提供了一些应用实例和数值结果。

英文摘要:

We consider the problem of approximating the reachable set of a discrete-time polynomial system from a semialgebraic set of initial conditions under general semialgebraic set constraints. Assuming inclusion in a given simple set like a box or an ellipsoid, we provide a method to compute certified outer approximations of the reachable set. The proposed method consists of building a hierarchy of relaxations for an infinite-dimensional moment problem. Under certain assumptions, the optimal value of this problem is the volume of the reachable set and the optimum solution is the restriction of the Lebesgue measure on this set. Then, one can outer approximate the reachable set as closely as desired with a hierarchy of super level sets of increasing degree polynomials. For each fixed degree, finding the coefficients of the polynomial boils down to computing the optimal solution of a convex semidefinite program. When the degree of the polynomial approximation tends to infinity, we provide strong convergence guarantees of the super level sets to the reachable set. We also present some application examples together with numerical results.

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