不确定性

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。

Some unknown elements always exist in the analysis process for the control systems, such as unmodeled dynamics, parametric uncertainties, change of the operating environment, model reduction and linearization approximations, etc., or external disturbance.

在对实际控制过程的分析过程中，总有一些未知因素存在，诸如未建模动态、参数不确定性、工作环境的变化、降阶及线性化近似等，也包括外部干扰的不确定性。

However, the control performance of the PMSM drive is still influenced by uncertainties, which usually features parameter variations, external load disturbances, unmodelled and nonlinear dynamics. To achieve high-performance PMSM drive, which has great ability of adaptation and better performance against disturbances, advanced control schemes have to be developed to deal with these uncertainties.

然而，由于永磁同步电机驱动系统受电机参数变化、外部负载扰动、对象未建模和非线性动态等不确定性的影响，要获得高性能的永磁同步电机驱动系统，必须研究先进的控制策略以解决这些不确定性的影响，使系统具有较强的自适应能力和抗干扰能力。

It isshown by theories and simulations that uncertain effects such as frictions and external disturbancesor unmodelled dynamices can be eliminatated and global exponential stability or global uniform ultimate boundedness stability can be guaranteed.

理论和仿真均证明，系统的不确定性诸如摩擦力、外部扰动及未建模动力学带来的不确定性影响，均可被设计的控制律补偿，最后可保证全局指数收敛或全局一致最后有界的结果。

Finally, the writer give policy recommendations from the changing of uncertainty of the income, uncertainty of expenditure, unsocialized intensity and overcoming traditional influence.

最后，就改变我国农民收入的不确定性、支出的不确定性、农业生产的社会化程度不高的现状和克服传统消费习惯的影响几个方面提出了政策建议。

The uncertainty caused by the errors of model and hypothesis belongs to unstatistical uncertainty.

由于模型假设与实际的误差所引起的不确定性属于非统计不确定性。

Both statistical uncertainty and unstatistical uncertainty exist on fatigue reliability analysis.

疲劳可靠性分析中存在统计不确定性和非统计不确定性。

The Nash equilibrium problem with l2-nor m bound disturbance was studied. The problem was considered as a compound dynam ic game described by N-person non-cooperative dynamic game and two-person zer o-sum dynamic game. By applying H∞ control theory method, the existence conditions of linear quadratic Nash equilibrium H∞ disturbance attenuati on strategies were presented and proved, and its state feedback Nash equilibrium solutions were given.

研究具有l2范数有界不确定性扰动的纳什均衡问题以具有不确定性扰动的线性二次纳什均衡对策问题为例，将其归结为由二人非合作非零和对策和各对策方与外部扰动的二人零和对策构成的复合对策问题，应用H∞控制理论方法，给出并证明了扰动衰减H∞状态反馈策略存在的条件和求解方法，并通过简例说明了算法的有效性

The investment in mining industry is time-consuming and irreversible, and has high level of uncertainty which engenders opportunity value of the investment.

矿业投资具有投资建设时间长、投资不可逆性和较高的不确定性等特点，矿业投资的不确定性因素形成了投资的机会价值。

Next, regarding question two, because present uses the injection contraceptive the method to maintain this population the stability, moreover already did not have the individual to move away or the situation which poaches, for this reason we transform this populations stability to ask this population every years newborn baby quantity to subtract this year death individual the quantity differential value; Moreover from this population year quantity with this year the end of the years quantity differential value, when tends 0, namely thought that this community individual quantity is stable, thus the question stability problem transforms to ask simple targets optimization problems model building; Carries on using MATLAB to the model obtains, obtains, when did not consider when uncertainty factor influence must inject the medicine female animal quantity is 276 heads, but when had considered after twin and by duplicate injection these two uncertainty factor influence, obtains must inject the medicine female animal quantity is 352 heads, including 110 are by the duplicate injection.

其次，对于问题二由于现在采用注射避孕药的方法来维持该种群的稳定，而且已经没有个体被运走或被偷猎的情况，为此我们把该种群的稳定性转化为求该种群每年的新生幼仔的数量减去该年死亡个体的数量的差值；另外从该种群年头的数量与该年年底的数量的差值，当趋于0时，即认为该群落的个体数量是稳定的，从而把问题的稳定性问题转化为求单目标的最优化问题建立模型；利用MATLAB对模型进行求得，得出当不考虑不确定性因素影响时要注射药物的雌性动物数量为276头，而当考虑了双胞胎和被重复注射这两个不确定性因素影响后，得到要注射药物的雌性动物数量为352头，其中有110头是被重复注射的。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。