arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.00189math.OCmath.DGmath.DS
收藏

平坦离散系统的精确线性化与控制

On the Exact Linearization and Control of Flat Discrete-time Systems

Bernd Kolar, Johannes Diwold, Conrad Gstöttner, Markus Schöberl

摘要:

本文讨论了平坦非线性离散时间系统的广义静态或动态反馈精确线性化,这也可能取决于新的输入的前移。我们首先研究的问题,其中一个给定的平坦输出的前向位移可以选择在原则上作为一个新的输入,以及随后如何实际上引入一个合适的反馈的新的输入。关于一个可行的输入的选择,容易验证的条件推导出来。引入这样一种新的输入需要一种反馈,这种反馈通常不仅取决于这种新的输入本身,而且还取决于它的前向位移。这是类似的连续时间的情况下,反馈依赖于时间导数的闭环输入-特别是准静态的-已经成功地用于精确线性化的平坦系统自上世纪九十年代。对于系统的平坦输出,不依赖于前向位移的输入,它示出了如何系统地构造一个新的输入,使得相应的前向位移的平坦输出的总数是最小的。此外,它示出,在这种情况下,线性化反馈的计算是特别简单的,和随后的设计的离散时间平坦度为基础的跟踪控制进行了讨论。以轮式移动机器人和三自由度直升机为例,说明了所提出的理论。

英文摘要:

The paper addresses the exact linearization of flat nonlinear discrete-time systems by generalized static or dynamic feedbacks which may also depend on forward-shifts of the new input. We first investigate the question which forward-shifts of a given flat output can be chosen in principle as a new input, and subsequently how to actually introduce the new input by a suitable feedback. With respect to the choice of a feasible input, easily verifiable conditions are derived. Introducing such a new input requires a feedback which may in general depend not only on this new input itself but also on its forward-shifts. This is similar to the continuous-time case, where feedbacks which depend on time derivatives of the closed-loop input - and in particular quasi-static ones - have already been used successfully for the exact linearization of flat systems since the nineties of the last century. For systems with a flat output that does not depend on forward-shifts of the input, it is shown how to systematically construct a new input such that the total number of the corresponding forward-shifts of the flat output is minimal. Furthermore, it is shown that in this case the calculation of a linearizing feedback is particularly simple, and the subsequent design of a discrete-time flatness-based tracking control is discussed. The presented theory is illustrated by the discretized models of a wheeled mobile robot and a 3DOF helicopter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑