时滞

The delay-dependent memoryless robust stabilization problem for a class of uncertain time-delay systems containing saturating actuator is considered in this paper.

研究了一类具有饱和执行器约束的不确定时滞系统时滞依赖型无记忆鲁棒控制问题。

A new form of control Lyapunov functional with time delays is proposed to construct feedback memoryless controllers which achieve global asymptotic stability for the considered systems.

本章通过构造含有时滞的Lyapunov泛函，采用了Backstepping技术进行时滞无记忆控制器设计，给出了控制器的存在条件，并保证了系统的全局稳定。

It is shown that these two sequences converge monotonically to a unique solution of the finite difference system.

给出一类求解具时滞边界条件的时滞反应扩散方程的数值方法，证明了迭代序列的单调收敛性以及差分格式的收敛

The only assumption is that the delay is bounded, the results can be ap plicable to systems with varying time delay.

该方法仅需假定时滞有界，因而其结论适用于变时滞的系统。

To overcome this drawback, a predictive control algorithm based on nominal objective function is presented. For polytopic uncertain systems with both state and input delays, a saturating state feedback predictive control algorithm is also investigated.

考虑到输入时滞的存在，针对凸多面体不确定状态和输入时滞系统，进行了带有饱和特性的状态反馈预测控制研究。

Through this discussion, we can clearly understand: research by the delay or pulsive problems and the existence of solutions with the conclusions of stability and pulsive delay variable conditions are inseparable.

通过讨论，我们可以清晰地看到：所研究的时滞或脉冲问题解的存在性及稳定性的结论与时滞变量和脉冲条件密不可分。

Resultantly, the individual warm/cold events in ENSO cycle appear to be partially locked to the annual cycle, and also exhibit obvious irregularity both in amplitude and in lasting time.

本文第四章研制设计了一包含海洋表面边界层和大气辐合反馈过程的热带太平洋海气耦合异常模式，进而利用该模式对ENSO循环进行了较为真实的模拟，通过对模式ENSO循环的演变特征及其形成机制的细致分析，建立了-ENSO循环的非线性分析模式，并提出了ENSO循环形成的一种更为客观的理论，指出：1）和观测事实类似，模式ENSO循环确实涉及了三种主要时间尺度过程即LF、QB和AC，其中LF为3-4年主周期振荡，QB占总方差10～20%；2）ENSO循环的正反馈机制是不稳定海气相互作用过程，且这一不稳定过程的发展在暖态中明显强于冷态；3）ENSO循环的负反馈机制在冷暖态中表现不同，在冷态消亡过程中，这种负反馈过程主要表现为西边界反射产生的时滞效应，但在暖态消亡过程中不存在类似的时滞效应，其负反馈过程主要表现为在海气耦合不稳定充分发展时伴随的赤道两侧冷水上翻过程的加强以及非线性过程的衰减作用抑制了不稳定的发展并最终使得系统回复至冷态；4）ENSO循环的3-4年主周期振荡是一非线性系统的自激振荡现象，其形成是线性系统的本征模即准两年振荡通过非线性机制产生的周期加倍所致，其中&单向性&大气辐合反馈加热过程对其形成至关重要；5）虽然年循环过程对ENSO循环形成没有本质影响，但它可明显影响ENSO循环的具体振幅和位相，使得ENSO对季节循环有明显的&锁相&特征，并且也使得ENSO循环在振幅大小和时间长短方面呈现出明显的不规则性。

Stability, robustness and oscillation of differenct uncertain time-delay systems are analyzed. Synthetical time-delay control schemes are proposed, including robust stabilizing control, variable structure control, robust dissipative control and so on. Industrial time-delay system model are established based on the theorematic results and industrial requirements. Pratical control algorithms and APC-software are developed and applied to practical process successfully.

在国家自然科学基金资助下，本项目对各类不确定时滞系统的稳定性分析、振动性质分析、鲁棒镇定控制器设计等问题进行了全面的理论分析，并结合流程工业生产过程的特点和企业需求，建立工业过程时滞系统模型，开发实用型的控制算法和先进控制软件，在一些典型的工业生产过程进行了成功的应用，取得了显著的经济效益和社会效益。

Because of the time delay unsynchronized control force may be applied to the structures, which may cause degradation in the efficiency of control or may even render the structures unstable. There for, it is of importance to make research on the time delay problem.

时滞是振动主动控制中不可避免存在的现象，即使是小时滞，也会导致系统在不需要能量时作动器向系统输入能量，致使主动控制效率的降低，甚至导致系统响应发散。

The advantage of this method is that, a unitized model which can describe short time delay and long time delay is constructed. Based on this unitized model, stability and stabilization of NCSs are discussed.

该方法可以建立一个统一的模型用于解决网络短时滞和长时滞的镇定性问题，并在转移概率矩阵已知的条件下给出系统均方稳定的充分条件。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。