模态

In chapter Ⅰ, a historial review of structure control is given; In chapter Ⅱ, A discussion of the controllability and observablity of flexible structures is given, Two kinds of controllability and observablity index are defined, and applied to actuator allocation; chapter Ⅲ considers the reduction of high order flexible structure mode; the content of chapter Ⅳ is about the basic problem of distributed parameter control system design. It is proved that a stable controllor in mode space may be unstable in real use in distributed paramater systems, also, by closed loop mode concept, a pole assignment method of flexible structure controllor design is given; chapter Ⅴ is about the low-authority controllor design, it is pointed out by use of high order eigenvalue/eigenvector perturbation, a better controllor can be designed; chapter Ⅳ considers flexible structure reduced order control; chapter Ⅶ disscusses the basic problem of flexible structure computer control, analyses discreate controllablity and observablity and its computing, the sample period and coefficient wordlength; chapter Ⅷ is on the problem of low flexibility compensation; chapter Ⅸ is a design example.

在第一章简要回顾了挠性结构控制的历史，并且指出控制中的一些问题；第二章讨论了挠性结构的能控性与能观性，定义了两类能控性程度和能观性程度指标，还将能控性程度概念应用于执行器位置的确定；第三章论述了高阶模型的降价问题，比较了适于挠性结构模型降阶的方法，指出其适用范围；第四章内容是分布参数系统设计的基本问题，首先证明在模态空间中设计的稳定的控制器在实际分布系统上可能是不稳定的，进而根据闭环模态的概念，获得挠性结构控制器设计的极点配置方法；第五章的内容是关于低权控制器的设计问题，指出利用特征值高价摄动和特征向量的摄动，可以设计出更加完善的低权控制器；第六章讨论挠性结构降阶控制问题；第七章讨论挠性结构计算机控制的基本问题，分析了时间离散化模型的能控性和能观性及其计算问题，讨论了采样周期选择和系数字长问题；第八章讨论低挠性结构的补偿问题；第九章的设计例子用来说明第二章和第四章的结果。

In this paper, the research object is the XM18 spherical generator, in order to improve the dynamic behavior of the machine tool, the following aspects have been studied in this thesis: Firstly, based on the elasticity theory and finite element analysis theory, the finite element models of the lathe bed, dovetail, dovetail shelf, headstock, fanlike plank and millhead shelf, which were the main parts of the spherical generator, were built up using ANSYS9.0. And based on the modal analysis theory and FEM technology, the free modal and the constrained modal analysis of the main parts were studied. Accordance to the analytical results, put forword methods to optimize the key parts.

本课题以XM18球面铣磨机为研究对象，为了提高其动态特性，本文主要从以下几个方面进行研究：首先，根据弹性力学理论和有限元分析的基本理论，利用ANSYS9.0软件建立了铣磨机的主要零部件床身、燕尾、燕尾座、主轴箱、扇形板和磨头座的有限元模型，利用有限元法对主要零部件进行了自由模态和约束模态分析，并根据分析结果对关键部件提出了改进方案。

With hysteretic damping structure, the practical test method for complex residual mode was derived for the first time.

对于滞后阻尼结构，首次推导出实用的复剩余模态的测试和主要用试验数据的模态综合方法。

At the basic of knowledge implication propositional logic, a system of knowledge implicational model prepositional logic system has been built. It can describe inference mechanism of inconsistent knowledge system which includes in modal information.

在知识蕴涵命题逻辑的基础上，构建了一个知识蕴涵模态命题逻辑系统，它可以描述包含模态信息的不协调知识系统的推理机制。

Based on the equilibrium equation, the states of self-stress and the modes of inextensional mechanisms are solved by the singular value decomposition method.

在建立空间杆件体系平衡方程的基础上，采用广义逆方法求解各种情况下的平衡方程，采用奇异值分解方法求解索杆的机构位移模态和自应力模态，并推导了力密度方法的基本公式。

Relative key concept and technique of this method was described in detail in this paper, such as the decomposition of balance matrix, the modes of self-stress, the modes of inextensional mechanisms, the analysis model of optimization under linear constrained condition, the integration of constrained matrix.

文中对桁架理论的奇异值分解法、自应力模态、机构位移模态、有约束线性优化数学模型、约束矩阵集成等关键概念和技术进行了详细的推导说明。

The third type is to measure the dynamic characteristics excited by environment. This method has attracted more and more attention due to the characteristics of convenience, feasibility and not intermitting traffic and so on.

模态试验是获取结构振动的原始数据（通常是加速度的时间历程），通过分析测量所得到的原始数据来获取桥梁结构的固有模态。

There are two types of dialog boxes: modal and modeless.

有两种类型的对话框，即模态对话框和非模态对话框。

The modal logic S5, viewed as a theory in S4, is a model of monadic Boolean algebras in the same way that S4 is a model of interior algebra.

模态逻辑 S5，被看作 S4 中一个理论，是一元布尔代数的模型，如同模态逻辑 S4 是内部代数的模型。

In this paper, it is demonstrated that the logic tool used in agent formalized d epiction should be the mixed modal logic which has both normal and non-normal m odal operators.

阐述了 Agent的形式化描述应该采用含有正规和非正规模态算子的混合模态逻辑为逻辑工具的观点。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷