基本参数

In our thesis, contents are organized as following In Chapter 1 we present our topic's internal and overseas research situations, theoretical and practical significance, and introduce the research object and contents, and the main contributions of this dissertation. Chapter 2 reviews the development of the stability results for nonlinear systems and some relevant recent results, which include Lyapunov and LaSalle-Yoshizawa theorems for nonlinear systems, and stochastic edition for stochastic nonlinear systems. Sontag's formula for systems affine in control is presented in the frame of CLF. The concepts of disturbance attenuation and the inverse optimality are also explained in this Chapter. In chapter 3 we present the solvable theorem of inverse optimal gain assignment problem, design the inverse optimal controller and the inverse optimal tracking controller for strict-feedback nonlinear continuous systems with unknown time-varing bounded disturbances and constant unknown parameters using an adaptive backstepping algorithm, which are nonlinear, continuous and are easier to realize. These designs are fully systematic and the algorithm can be directly coded in symbolic software. The results of simulation show the effectiveness of the control algorithms.

论文的结构如下：在第1章中，给出了本文研究课题的研究现状、理论意义和实际应用，并介绍了本文的研究对象、研究内容以及主要贡献；在第2章中，针对确定性非线性系统和随机非线性系统，分别介绍了Lyapunov定理、LaSalle-Yoshizawa定理及其随机版本；对仿射系统，在控制Lyapunov函数框架下，给出了Sontag公式；同时给出了非线性系统扰动抑制和逆最优控制问题的基本概念；在第3章中，针对具有未知时变有界扰动和未知定常参数的一类不确定非线性系统，给出并证明了逆最优增益配置可解定理，使用自适应Backstepping算法和均值定理，系统地设计了自适应逆最优控制器和逆最优跟踪器，这种设计方法可同时获得逆最优控制策略和自适应律，简单明了，仿真结果表明该控制算法的有效性，并给出了性能估计。

Finally,the wind velocity data of Nantong observatory are used to verify the methods above-mentioned,and the likelihood ratio method and Kolmogorov statistic are used to test the fitness of the distribution.

引入涵盖Gumbel，Frechet，Weibull三类极值渐近分布的广义极值分布模型，给出该模型参数的极大似然估计的计算公式，并由此导出设计基本风速及其置信上限的计算方法。

Meanwhile,how to confirm the basic technological parameters of the tension levelling line is put forward.

介绍影响带材平直度的因素以及矫直带材的方法，指出了如何确定拉伸弯曲矫直机的基本工艺参数。

In whichthe mathematical relation betweenthe detection limit and elementary factors was established.

建立了检出限与基本物理参数的数学关系，并据此讨论了改善检出限的方法。

The current research points out that for the CFCHS joints the linear extrapolation method can be used for chords,whereas the quadratic extrapolation method must be used for braces.The hot spot stress distributions on the CFCHS joints tend to be more uniform and their SCFs become smaller significantly,compared with the CHS joints.Axial tension on the brace puts the CFCHS joints at a disadvantage,which produces higher SCFs than axial compression.The effects of nondimensional geometric parameters β,τ and γ on SCFs of the chords of the CFCHS joints are basically the same as those of the CHS joints,but for the braces,there is a bit difference in the effects of parameters β,τ and γ between the two kinds of joints.Concrete has the function of improving the CFCHS joint rigidity and then decreasing SCFs which is expected to increase fatigue strength,but concrete strength grade does not exert significant influence on SCFs.

研究表明：CFCHS节点的热点应力，对主管可采用线性外推方法，对支管需采用二次外推方法；相比CHS节点，CFCHS节点的热点应力分布趋于均匀，SCF显著减小；CFCHS节点支管轴向受拉比受压不利，SCF增大；CFCHS节点几何参数β，τ，γ对主管SCF的影响效应与CHS节点基本一致，但是对支管SCF的影响效应与CHS节点有些差异；混凝土的作用主要是改善CFCHS节点刚度，从而降低SCF，并预期可提高疲劳强度，但混凝土自身强度等级的高低没有显著影响节点的SCF。

The estimation on the regression coefficients of linear model is one of the most basic content.

线性模型的统计分析理论相当丰富，而参数估计问题则是其中最基本的内容之一。

Relative study indicate that current doubler rectifier is misfit for high-voltage low-current apply.so This paper proposes a auxiliary net ZVS PWM full-bridge three-level converter, its" improved topology structure and its"topology family in different controlling mode. The principle of these converter is analyzed in detail. Simulation results verify the effectiveness of the proposed converter.

为了进一步简化辅助网络的结构，并解决轻载时，超前桥臂实现软开关困难的问题，提出了一种新型宽负载范围辅助电感ZVS PWM三电平全桥直流变换器，它在基本拓扑结构的基础上只需增加一个辅助电感，利用辅助电感的能量就可以实现宽负载范围内所有开关管的软开关，详细分析了该变换器的工作原理，进行了参数设计和仿真验证。

The boundary layer edge conditions and the resistance and lift force coefficient in different Mach number and different angle of attack are worked out. Results of the method are in good agreement with the aerodynamics rules.

从而得到了边界层的外缘参数，计算出了弹丸在不同马赫数和不同攻角下的阻力系数和升力系数，分析结果符合空气动力学的基本规律。

The thesis studies axis distribution of magnetic field and carries on the simulation and computation using MATLAB. Then, the air-cored cylindrical winding is selected.

以磁场的基本理论为基础研究了空心线圈的轴向磁场分布与线圈参数的关系，并用MATLAB软件对磁场分布进行了计算和仿真，确定了空心圆柱线圈的设计方案。

Based on the study of micromanipulator, the application of giant magnetostriction materials is explored.

针对Tb-Dy-Fe系合金，研究了超磁致伸缩材料的磁致伸缩原理、基本性能和主要影响参数，并结合现代微器人的研究和开发，探讨了超磁致伸缩材料的实际应用。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。