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The experimental results show that μ-controller can suppress the influence of disturbances and unmodelled dynamics, the control system has robust stability and robust performance.

实验结果表明，μ控制器能够抑制干扰和模型不确定对机器人系统的影响，系统具有很好的鲁棒稳定性和鲁棒性能。

Then, based on the idea of set-membership identification, we propose a recursive estimation for extended parameters which include the parameters of nominal model and the bound of unmodelled dynamics and disturbances.

然后利用集员辨识的思想，将名义模型的参数和未建模动态及干扰的大小作为未知参数，提出了一种递推参数估计方法。

An adaptive robust tracking problem is investigated when a discrete-time plant is subject to both unmodelled dynamics and unknown external disturbances.

摘要针对存在未知干扰和未建模动态等不确定性的系统的自适应鲁棒跟踪控制问题进行了探讨。

An adaptive robust tracking problem is investigated when a discrete-time plant is subject to both unmodelled dynamics and unknown external disturbances.

针对存在未知干扰和未建模动态等不确定性的系统的自适应鲁棒跟踪控制问题进行了探讨。

Moreover, by using fuzzy control concept in variable-structure system, the chattering problem which exists in most variable-structure systems is subdued, and the system robustness to unmodelled uncertainties and external disturbances is improved.

另外，通过在分散变结构控制系统中引入模糊控制规则减弱了一般变结构控制系统的颤振。

The algorithms have stronger robustness, if there exist unmodelled dynamics, it can still obtaine satisfactory control results under action of stronger bounded unmeasurable disturbances.

具有非常强的鲁棒性和抗干扰能力，当系统具有未建模动态和较强的有界不可测干扰时仍可得到令人满意的控制结果，这一点通过仿真得到了验证。

To solve the nonlinear attitude control problem of a class of spacecrafts, the strongly coupled dynamics model is decomposed into some subsystems and the coupling between the subsystems, unmodelled dynamics and exterior disturbances are regarded as the uncertainty of the system.

引 言空间飞行器的姿态控制系统是一个具有参数摄动和外来干扰的非线性系统。滑模控制(Slidingmode control，SMC)对系统参数的不确定性和干扰具有较强的鲁棒性[1，2 ] ，近来越来越多地被用于对空间飞行器的控制，但滑模控制的输出存在高频抖振。

Pointing at the problem that the effectiveness of learning control is influenced by the unrepeated disturbances, three types of repetition learning hybrid control concerned with fricitions are proposed, and their convergence is proven.

实验和FFT的分析结果表明，本文提出的四种控制方法均增强了控制系统的稳定性，提高了控制精度和平滑性，特别是在消除装配中的振动和阻塞现象方面是非常有效的。

In virtue of wavelet transform, the gray change of image is known and the disturbances of noise are voided.

小波变换不仅可以有效地反映了图像的灰度变化，又尽可能地避免了噪声干扰。

These results can shed lights on revealing the mechanisms of plant's adaptation to xeric conditions, as well as the effects of anthropogenic disturbances on the local extinction of native species, and/or invasion of shrubs.

我们的研究结果从植物种、功能群和群落三个层次进一步揭示了植物对干旱生境的适应机制，并初步阐明了人类干扰特别是过度放牧对草原群落建群种和优势种的生态替代或/和灌丛入侵的影响。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。