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arXiv 2103.13803math.OCmath.DS
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线性动态切换系统无解最优控制的几何代数方法

Solver-free optimal control for Linear Dynamical Switched System by means of Geometric Algebra

Anna Derevianko, Petr Vašík

摘要:

利用几何代数的方法设计了线性切换系统的控制算法。更准确地说,我们开发了一个非奇异矩阵的二维线性动态切换系统的切换路径搜索算法,其积分曲线由两组中心化椭圆形成。然后将它们表示为二次曲线几何代数(GAC)的元素,并通过计算切换点(即交点和接触点)来构造切换路径。为此,我们使用符号代数运算,更准确地说,楔形和内积,这是可实现的总和的产品在坐标形式。因此,不需要方程组的数值求解器。实际上,可能带来不准确性的唯一操作是向量归一化,即平方根计算。所得到的切换路径由分别从两组积分曲线中选择的椭圆段形成。切换点要么是我们算法的第一步或最后一步中的交点,要么是接触点。这种选择保证了开关路径相对于开关数量的最优性。在两个例子中,我们展示了搜索二次曲线的交点,因此,我们描述了在这两种情况下的开关路径的建设。

英文摘要:

We design an algorithm for control of a linear switched system by means of Geometric Algebra. More precisely, we develop a switching path searching algorithm for a two-dimensional linear dynamical switched system with non-singular matrix whose integral curves are formed by two sets of centralised ellipses. Then it is natural to represent them as elements of Geometric Algebra for Conics (GAC) and construct the switching path by calculating the switching points, i.e. intersections and contact points. For this, we use symbolic algebra operations, more precisely the wedge and inner products, that are realisable by sums of products in the coordinate form. Therefore, no numerical solver to the system of equations is needed. Indeed, the only operation that may bring in an inaccuracy is a vector normalisation, i.e. square root calculation. The resulting switching path is formed by pieces of ellipses that are chosen respectively from the two sets of integral curves. The switching points are either intersections in the first or final step of our algorithm, or contact points. This choice guarantees optimality of the switching path with respect to the number of switches. On two examples we demonstrate the search for conics' intersections and, consequently, we describe a construction of a switching path in both cases.

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