一种消除变结构控制抖振的新方法及其在飞行器中的应用

Y.D. Song, X. Liao, Z. Sun, Y. Li
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引用次数: 3

摘要

变结构控制由于其处理建模不确定性的有效性,在鲁棒控制设计中得到了广泛的应用。然而,目前的VSC设计方法由于涉及到不连续的控制作用而导致抖振。如何消除VSC中的抖振一直是一个有趣而又具有挑战性的研究课题。现有的抖振消除方法大多是以降低控制精度为代价的。本文提出了一种在不牺牲控制精度的情况下消除抖振的新方法。所提出的方法背后的思想非常简单:不是直接设计控制输入,而是设计控制(补偿)速率。一旦补偿单元的速率确定,控制输入很容易通过积分得到。结果表明,这种处理可以得到有界平滑的控制作用,同时保持系统的渐近稳定性。对飞行器航向速度控制的仿真验证了该方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A new approach to eliminating variable structure control chattering with application to flight vehicles
Because of its effectiveness in dealing with modeling uncertainties, variable structure control (VSC) has been widely used for robust control design. However, current VSC design method leads to chattering due to the discontinuous control action involved. How to eliminate the undesirable chattering in VSC has been an interesting yet challenging topic of research. Most existing methods for chattering elimination are achieved at the price of control precision. In this paper, a new approach is introduced to remove chattering without sacrificing control precise. The idea behind the proposed approach is extremely simple: instead of designing the control input directly, the control (compensating) rate is designed. Once the rate of the compensating unit is determined, the control input is readily obtained via integration. It is shown that such a treatment leads to bounded and smooth control action while at the same time maintains asymptotical system stability. Simulations on heading speed control of flight vehicle verify the effectiveness of the method.
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