符号信息表示与模糊符号化测量

本文从测量理论与技术的发展出发，简要阐述了测量学科发展中遇到的困难和需求，将传统的测量框架加以拓展，提出了模糊符号化测量的新概念，通过符号系统与符号信息表示的讨论，指出传统测量与模糊符号测量是对客观世界定量与定性，微观与宏观的两种信息描述方法，它们相互补充，构成了测量学科新的发展趋势。     

多维模糊符号化测量的研究

基于信息测量的需求,本文在模糊符号化测量概念的基础上,将传统间接测量的概念加以拓延,提出了多维模糊符号化测量的概念,并对其实现方法进行了研究的探讨。     

模糊符号化测量的分度研究

本文基于数值领域的测量分度 ,在模糊符号化测量概念的基础上 ,提出了模糊符号化测量的分度概念并对其基本内容和主要应用方向作了探讨 ,这对于模糊符号化测量的深入研究和发展 ,具有实际意义     

CFB锅炉床温的容错测量与传感器故障诊断

床温测量对于循环流化床（CFB）锅炉至关重要，直接影响炉内脱硫和脱硝。针对循环流化床锅炉床层温度信号采用分布式测量的特点，基于多个床温传感器信号的冗余性和互补性，利用多传感器信息融合技术提出一种新的床温测量的综合方法。该方法依据有限的传感器资源，消除测量中的不确定性，剔除传感器故障信息，获得更准确、可靠的测量结果，达到容错测量的目的，对于床温信号的二次利用，如燃烧优化控制具有重要意义。提出一种传感器故障诊断方法，运用模糊数学原理，分析处理故障诊断中用到的模糊信息，建立了关于故障诊断的模糊关系矩阵。给出了某循环流化床锅炉床温实际测量值的容错测量综合结果，并对故障传感器进行了诊断，证实了该方法的有效性和可行性。     

电机转速及位置测量新方法

介绍了一种测量电机转速和旋转位置的新方法及其测量装置,该方法通过测量一个零位信号和一个余弦信号,同时得到电机的转速及位置信息,克服了旧的测量方法的测低速时的缺陷。     

局部放电测量方法及其测量回路的抗干扰研究

现有的局部放电测量技术主要有窄带测量和超宽带测量两种。超宽带测量可以获得更多更真实的有用信息并能提高测量的信噪比 ;而窄带测量因其应用和研究的广泛性已积累了丰富的经验 ,提出了许多诊断和分析的方法 ,因此同时进行窄带和超宽带测量有助于获得更多的信息 ,更好地利用已有研究成果。而消除和抑制测量现场的干扰是有效测量的前提 ,本文总结了试验中采取的回路抗干扰的措施     

利用卫星时间作基准的电力系统同步相量测量

本文首先对同步相量测量的思想进行阐述，然后给出一种新的同步相量测量方案，该方案将基于ＧＰＳ时间信息的时钟同步技术与离散付氏变换算法相结合，能在统一参考基准下实时测量电力系统各节点的电压电流相量。文章对该方案涉及到的算法、同步采样技术、硬件构成以及可行性等进行了详细描述。     

论电测量的一般问题

本文提出了关于电测量的一种新理论，认为电测量的一般问题是完成一种变换，而完成这种变换的电路均可包含于两种基本类型电路之中，本理论将有助于对已有测量电路的分析评价以及指导构思新电路。     

电机转速及位置测量新方法研究

介绍了一种测量电机转速和旋转位置的新方法及其测量装置。该方法通过测量一个零位信号和一个余弦信号,同时得到电机的转速及位置信息,克服了旧的测量方法在测低速时的缺陷。     

惯性管道测绘仪（IPSS）设计与实现

为了实现石油及天然气管道地理和几何信息的高精度测量,本文设计了一种智能式、超小型的管道测绘系统。该系统由惯性测量单元（IMU）,海量存储单元、里程仪和GPS等构成,以轻小型光纤传感器—光纤陀螺为主传感器,结合组合惯性测量技术,通过测绘系统经过管道各点时的姿态和位置信息,可取得被测管道的几何信息。该系统的使用可有效提高管道测量的精度,为管道状态的监视和维护提供依据,同时促进管道测量向全自动和存贮式方向发展。     

混沌态电阻测量电路的研究

本文以混沌系统的参数敏感性和符号动力学为基础，设计了一种简单的电阻测量电路，能直接将阻值的变化映射成二进制代码。计算机仿真实验表明这种方法是很有效的。它具有电路简单、灵敏度和分辨率高、非线性误差小等特点。该方法也为我们探索混沌在测量中的应用提供了一条新的途径。     

Symbolic factorization methodology for multistage amplifier transfer functions

In this paper, we discuss a symbolic simplification methodology to derive approximated factorized forms of the transfer function of multistage amplifiers in the complex frequency domain. The developed approach is useful for hand calculation and is also suitable to be implemented in symbolic computer‐aided design tools. Although the proposed methodology is mainly intended for the analysis and design of operational transconductance amplifiers, it can straightforwardly be applied to the small‐signal analysis of any analog linear circuit. Design examples are provided to verify the effectiveness of the proposed approach implemented through a Matlab function. Copyright © 2015 John Wiley & Sons, Ltd.     

调频准谐振变换器系统的非线性全阶建模及符号分析法

基于开关函数建立了准谐振变换器的全阶非线性电路模型 ,并用等效小参量法进行分析 ,可得到全符号表示的谐振元件和滤波元件状态变量的直流解和纹波解。文中分析方法表明 ,利用开关函数的非线性建模及等效小参量分析 ,可统一PWM类及谐振类变换器的分析。     

基于图论的网络函数灵敏度符号分析法

在网络的最优化设计和容差分析中，灵敏度分析具有重要意义．常规的灵敏度计算方法都是纯数值计算，它们的特点是逐点进行完整的数值求解，因此不可避免的存在冗余项对消问题、数据存储量大和计算误差等问题．以图论知识为基础，应用连通图中的k-树树支导纳乘积，给出网络函数及其灵敏度分析的符号表达式．该方法较之以数值计算为基础的增量网络法和伴随网络法，具有计算精度高、计算速度快、易于计算机实现等优点，算例表明该算法理论的正确性和可行性．     

Simulation of Linear and Nonlinear Circuits for Symbolic Analysis and Transient Response

For pedagogical reasons, classroom examples of analysis are usually performed symbolically. A student can frequently attain insight as to the relative effects of various circuit elements when they have symbolic labels. A prototype program has been devised which is capable of determining symbolic equations for a class of circuits. The equations are written in FORTRAN type notation. Although the original intention of the program was to determine circuit state equations, several other applications exist. For instance, dc analysis, such as that which is required for steady-state analysis, may be performed. If a circuit is linear, it is possible to obtain a transfer function for which the s polynomial coefficients are symbolic. Transient responses often yield information which is not discernible from symbolic relationships. For this reason, a companion program which integrates the state equations determined by the preceding program has been written. Currently, the integration routine must be run separately by the user. This entails the insertion of the state equations and other integration control statements. It is believed that a program which relieves the user from this task will be available by the time this paper is published. Numerical examples are also included in the paper.     

Symbolic analysis of (MO)(I)CCI(II)(III)‐based analog circuits

New nullor‐based models are introduced to describe the behavior of the first generation current conveyor (CCI), second generation current conveyor (CCII), third generation current conveyor (CCIII), their inverting equivalents (ICCI(II)(III)), and/or their multiple output topologies (MO(I)CCI(II)(III)). These nullor equivalents include only grounded resistors to improve the formulation of equations in symbolic nodal analysis. In this manner, it is highlighted the usefulness of the proposed models to calculate analytical expressions in MO(I)CCI(II)(III)‐based analog circuits. Copyright © 2009 John Wiley & Sons, Ltd.     

Symbolic convolution

An implementation of convolution using a symbolic mathematics software package is described. The emphasis is on the internal data structure needed to represent signals that are defined piecewise over disjoint intervals. Then the overlap-add form of convolution is used to produce the convolution of signals that are the sum of piecewise segments. A working implementation has been completed for both discrete-time and continous-time convolution. Several examples are shown to illustrate the results and to suggest ways in which this sort of software might be useful for classroom presentations     

Symbolic Analysis of Linear Non-Reciprocal Circuits

A symbolic expression of a transfer function in a linear non-reciprocal circuit is proved; the symbolic parameters may be proper immittances and controlled source parameters. the effectiveness of computation of symbol product coefficients is improved by using a generation-and-test algorithm of symbol combinations. A comparison between the most efficient symbolic analysis methods and the proposed method is performed. It is concluded that the proposed method is competitive with these methods.     

Symbolic analysis of electric networks with higher order summative cofactors and parameter decision diagrams

The paper introduces the concept of higher order summative cofactors (HOSCs) to the circuit analysis. Although the concept is not new, it is not well known. In the paper, some mathematical background of HOSCs is presented. The further development of the concept of HOSC will yield computer implementation arithmetic of HOSC. A cancellation‐free symbolic analysis technique, which is based on HOSC arithmetic, is presented. This technique allows results to be created directly from a netlist in the form of a binary decision diagram, which is called a parameter decision diagram. Additionally, HOSC arithmetic allows the calculation to be started in many places (sometimes distant) simultaneously. The techniques of rolling up the already analyzed parts of a circuit, which is built into HOSC arithmetic, result in a novel multilevel hierarchical analysis method that is called hierarchical parameter decision diagram (HPDD). Unlike in most hierarchical methods, the results that are obtained based on the subcircuit representation in HPDD always maintain a cancellation‐free form. The HPDD always represents the sum of the product form, which is heavily compressed due to the self‐similarities of the actual circuit. The time that is required for any recalculation of the transfer functions is greatly reduced. Analysis of models that are based on pathological components is also a natural consequence of using HOSC arithmetic.