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An experiment on forming of cross-hatch on the ablation material surface has been done under the condition of Mach 5 and tur-bulent boundary layer regime.Artifitial disturbances created by randomly setting several pins along a line perpendiculer to the flow direction have shown stochastical character of local cross-hatch and independence of global orderly structure,therefore the pattern appeared fractal behavior.

在外流M＝5湍流边界层状态下，模型为170×300mm￣2蜂蜡平板上进行了烧蚀花纹图案生成的实验研究，通过实验证明了人工安置干扰源并不影响烧蚀材料表面花纹的有序结构，对大面积烧蚀花纹的分析表明，局部花纹结构具有随机性质，因此烧蚀花纹具有分形结构的特性，用分形方法可以大致模拟花纹生成图案。

The controllers given are proved theorically that they can make error systems full states asymptotically decay to zeros and are insensitive to external disturbances and parameter uncertainties and thus it is of strong robust nature.

理论上严格证明了所给控制器能够使闭环同步误差系统全局渐近稳定于零值且不受外部干扰和系统参数不确定性的影响，具有较强的鲁棒性。

In this paper, the problem of adaptive stabilization of slowly time-varying systems with unmodeled dynamics is investigated in the presence of unknown but bounded disturbances.

摘要研究了含有未建模动态的慢时变系统的自适应镇定问题。

The approach can be used in the case where there exist parameter uncertainties, unmodeled dynamics and unknown bounded disturbances.

本文提出的控制方案提高了系统的鲁棒性能，使系统存在不确定性时，仍能保证全局稳定性，使闭环系统的所有信号都是有界的。

This paper presents a new analysis method for model reference adaptive control with arbitrary bounded input nonlinearities, which does not require the stability of plants. The plant can have unmodeled dynamics and bounded disturbances.

余文提出了一种分析具有任意非线性输入的模型参考自适应的新方法，它不要求对象是稳定的，允许系统存在未建模动态和有界扰动。

In this paper,the problem of adaptive stabilization of slowly time－varying systems with unmodeled dynamics is investigated in the presence of unknown but bounded disturbances.

研究了含有未建模动态的慢时变系统的自适应镇定问题。考虑的对象具有非最小相位、含未建模动态和大范围时变参数等不良特性，且存在未知但有界外部扰动。

And considering the uncertain factors that the system may meet during the operation, a H robust control algorithm is employed when devise the controller of the system to compensate disturbances and unmodeled factors of the system. Finally, simulation and experiments are done to test the systems robustness and performance.

鉴于系统工作过程中存在的各种不确定性因素，系统控制器的设计采用了H_∞鲁棒控制算法，以抑制系统的外界扰动以及被控对象的模型不确定性，并进行了系统仿真和试验台试验研究。

Comparing to the classic PI control, the results of the simulations show that the proposed controller is effective. It has a robust dynamic performance with a strong capability of restraining unmodeled dynamics and bounded disturbances.

通过换流站控制的仿真实验，与传统的PI控制仿真结果相比较，这种新颖的换流站控制器更加符合实际，具有抑制系统未建模动态和有界扰动的能力，因此具有更强的鲁棒性和自适应学习能力以及较好的动态性能。

The adaptive nonlinear damping and changing energy function are used to counteract the effects of the unmodeled dynamics and unknown bounded disturbances on the system.

针对一类重要的多输入多输出非线性参数化系统提出了一种新的鲁棒自适应控制器的设计方法，采用自适应非线性阻尼和变能量函数法来抑制未建模动态和扰动对系统的影响。

Although, PI controllers are widely used in the HVDC systems, they have high sensitive responses to random disturbances , low robust performance, and can not solve some problems in power systems, such as unmodeled dynamics , nonlinear uncertainties.

目前，在高压直流输电系统换流器控制应用领域中常用的控制方法还是经典的PI控制，对干扰影响反应强烈，鲁棒性能差，不能解决电力系统中的未建模动态和非线性动态不确定性等缺点。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了