查询词典 dynamic state

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

In this chapter, three kinds of target recognition methods are performed, which are:①Target recognition method based on the description of polarization parameter plane. The echo polarization states of target are projected onto the polarization state plane described by the ellipticity ε and the tilt angle τ of the polarization ellipse, the change of parameter following ferquency becomes the chart. According to the changing trait of the chart, the multidimensional polarization feature space of target has been contructed. Furthermore, a series of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.②Target recognition method based on the description of Poincare polarization sphere. The echo polarization states of target expressed by Stokes vector are projected onto the Poincare polarization sphere. The conception of polarization ferquency stability, which is used in describing the dynamic distribution characteristics of the target echo polarization states on Poincare polarization sphere, has been defined. A group of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.③Target recognition method based on the description of frequency sensitivity. In accordance with the conception of the polarization state distance defined on Poincare polarization sphere, the frequency sensibility of the physical structure property of target has been investigated, the frequency distribution feature curves in PSD domain are obtained, and targets'features are extracted by means of the curve-fitting method with Least Square Criterion.

这章具体研究了基于三种极化散射特性描述的相应的目标识别方法：①基于极化参数平面描述的目标识别方法，将目标回波极化状态投影到以极化椭圆参数，即椭圆率角ε和倾角τ表征的极化状态平面上，参数随观测频率的变化就形成了图，根据图的变化特点构造了目标的多维极化特征空间，并提取了不敏感目标姿态变化的极化特征参数组来设计目标的识别器结构；②基于Poincare极化球面描述的目标识别方法，采用Stokes矢量表征目标回波的极化状态，并将其投影到描述极化状态的Poincare极化球面上，定义了极化频率稳定度的概念用以刻画目标回波极化状态在Poincare极化球面上的动态分布信息，提取了准方位不变性的目标极化特征，最后设计了目标的识别器结构；③基于频率敏感性描述的目标识别方法，通过在Poincare极化球面上所定义的极化状态距离的概念，研究的是复杂目标物理结构特性对探测信号频率的敏感程度问题，获得了在极化状态距离下的频率分布特性曲线，采用最小二乘估计曲线拟合方法，它既用于极化特征的降维，同时又直接将拟合参数作为目标的分类特征。

According to the convergence of the state variable and duty ratio,the steady-state and dynamic properties of the system were discus...

仿真结果证实了所提控制方式的有效和理论分析的正确。

The static description expresses the object's state, and the dynamic description is divided into two parts: one is the operation to modify the class's own attribute state, and the other is the operation to output the result.

即对象是把数据和操作数据的代码封装在一起的，有着特殊的属性和行为方式。

Traditional KF is utilized to identify structural parameters by transformation from dynamic system differential equation to state space, and combining structural parameters and responses in system state vectors in this dissertation.

利用传统KF将动力学系统的运动微分方程转换到状态空间中，然后将待识别的参数同结构的响应—并作为系统的状态向量进行识别。

The so-called " dynamic " means in many stage make policy of the question, by a certain order, and according to the difference that it selected decision for every step , it will cause the transformation of the state immediately , and make a decisive sequence in the state of changing finally.

所谓"动态"，指的是在问题的多阶段决策中，按某一顺序，根据每一步所选决策的不同，将随即引起状态的转移，最终在变化的状态中产生一个决策序列。

There is very little information for general cell diagnosis, which is universal problem in aluminum reduction process. Studies on technique of getting and processing cell state parameters have been made, where direct detection, on-line emulation and fuzzy information processing are combined. Then a new method of dynamic temperature detection, it's model and formula are proposed, and a practical equipment was designed. 3. Information about aluminum reduction process state are very different, not enough and unprecise, while there are many knowledge based on experience.

2为解决目前铝电解过程控制系统中普遍存在的、能用于槽况综合解析的信息不足这一问题，研究了综合运用直接检测技术、在线仿真技术和模糊信息处理技术等技术获取和处理电解槽的各种状态参数和信息的方法；并提出了一种新型的动态测温方法，推导了该方法的数学模型和计算公式，给出了公式的误差分析并设计了一个实验用动态测温装置，向实现对电解质温度的直接检测和控制迈出了探索性的一步。

The dynamic mathematical models of steady state and unsteady state heat storage in liquid medium are established systematically.

介绍了按照改进的时间温度复合模型设计优化间歇过程换热网络的程序结构。

According to the internal force and external force of the cloth,the physical model is built.With this model,the dynamic simulation process of the cloth from non-balanceable state to balanceable state can be computed when collisions are not happened.

根据织物内部结构和外部受力的特点，建立物理模型，计算模型在没有碰撞的情况下，动态的模拟织物从非平衡的受力状态到平衡的受力状态之间的全过程。

Vascular endotheliocyte fluorescence staining and leukocyte fluorescence tracing method were applied, in combination with microscopic video system and computer imaging analyzing system, to observe in dynamic and quantitatively the influences of acupuncture on pia matral encephali microvascular morphology, density and blood flowing velocity at 3 hours, 6 hours and 24 hours after cerebral occlusion of meddle cerebral artery.morphology, density and blood flowing state at various time divisions observed directly microscopically and vascular endotheliocyte morphology and the state of brain tissue which near the microvascular after infusion with velocity in infarcted area at various time divisions measured in quantity in each group.microvascular endotheliocytes were colored worse and more fluorescent exudation appeared.

采用血管内皮细胞荧光染色及白细胞荧光示踪法，结合显微录像系统和计算机图像分析系统，动态定量地观察了针刺对大脑中动脉阻塞后3，6，24h软脑膜微血管形态、密度、血流速度的影响。主要观察指标：①从显微镜下直接观察各组大鼠不同时段软脑膜微血管的形态、密度、血流状况，以及注入荧光剂后血管内皮细胞形态和周围脑组织状况。②定量测量各组大鼠不同时段梗死区微血管密度、血流速度。结果：120只大鼠均进入结果分析。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。