SMC for Systems With Matched and Mismatched Uncertainties and Disturbances Based on NDOB
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摘要: 针对一类n阶匹配与非匹配不确定性和扰动共存的系统,提出了一种新颖的基于非线性干扰观测器的滑模控制方法。将非匹配扰动的估计值融入到滑模面,设计了集成扰动观测的滑模控制。与传统的滑模控制方法相比,该方法在匹配与非匹配不确定性和扰动出现时具有较好的抑制能力,并能有效地抑制切换增益所引起的抖振现象。利用李雅普诺夫理论和输入-输出稳定性概念严格证明了闭环系统的稳定性。最后通过两个仿真实例验证了所提控制方法的有效性。
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关键词:
- 滑模控制 /
- 非匹配不确定性和扰动 /
- 非线性扰动观测器 /
- 输入-输出稳定
Abstract: This paper proposes a novel sliding mode control (SMC) approach for general nth order systems with matched and mismatched uncertainties and disturbances based on nonlinear disturbance observer (NDOB). By designing a novel sliding mode manifold integrated with a disturbance estimation technique, a NDOB-based SMC method is designed for these systems. As compared with the nominal SMC method, the proposed method obtains a better disturbance rejection ability in the presence of matched and mismatched uncertainties and disturbances, it can ensure a satisfactory system performance and reduce the chattering in case of reducing the switching gain. A rigorous stability analysis of the composite closed-loop system is provided using Lyapunov theory and input-to-state stable concept. Finally, two simulation results are provided to verify the effectiveness of the proposed control method.-
Key words:
- Input-to-state stable /
- mismatched uncertainties and disturbances /
- nonlinear disturbance observer (NDOB) /
- sliding mode control (SMC)
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Table Ⅰ Control Parameters for the Numerical Example in Case 1
Controllers Parameters SMC1 k = 8, η= 16 SMC2 k = 8, η= 10 NDOB-SMC k = 8, η = 10, l = diag{6, 6, 6} Table Ⅱ Control Parameters for the Numerical Example in Case 2
Controllers Parameters SMC1 k = 8000, η= 950 NDOB-SMC k = 8000, η = 950, l = diag{6, 6} -
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