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Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)最新文献

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Fault detection using topological case based modelimg and its application to chiller performance deterioration 基于拓扑案例建模的故障检测及其在冷水机组性能劣化中的应用
H. Tsutsui, A. Kurosaki, T. Sato, Y. Hiraide
We apply a new modeling technique, Topological Case Based Modeling (TCBM), to fault diagnosis. In this paper we propose a new model which represents a continuous input/output relation using a set of numerical data, and it is possible to describe nonlinear systems. We employ the idea of case based reasoning (CBR). CBR infers a new case from stored cases and these relation.[1] It is important to define the similarity, that is a relation among the cases. We propose to define the similarity as the neighbourhood in input space corresponding to output accuracy and its accuracy is arbitrarily set before constructing the model. We name this technique Topological Case Based Modeling. In addition, we describe that TCBM has several advantages over other models. Finally we also show the example of TCBM to detect the deterioration for a chiller system.<>
我们将一种新的建模技术——基于拓扑案例的建模(TCBM)应用于故障诊断。本文提出了一种用一组数值数据表示连续输入/输出关系的新模型,它可以用来描述非线性系统。我们采用基于案例推理(CBR)的思想。CBR从存储的案例和这些关系中推断出一个新的案例。[1]重要的是定义相似度,即案例之间的关系。我们提出将相似度定义为输入空间中与输出精度相对应的邻域,其精度在构建模型之前是任意设置的。我们将这种技术命名为拓扑案例建模。此外,我们描述了TCBM比其他模型有几个优点。最后,我们还展示了TCBM检测冷水机系统劣化的例子。
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引用次数: 4
Performance improvement of material recognition sensor using cubic spline interpolation 利用三次样条插值改进材料识别传感器的性能
Lim Young Cheol, Park Jong Kun, Cho Kyung Young, Kim Eui Sun, Kim Tae Gon, Kim I Gon
This paper describes a noble robot sensor designed to recognize an unknown material by measuring thermal conductivity on various ambient temperature. An active sensor to measure the thermal conductivity of a gripped object was designed and the software program to discriminate material was developed with C language. To discriminate material, it is required to make the look-up table in which temperature response of different materials on the various ambient temperature are stored. But it is impractical to store data on the all ambient temperature. Therefore using cubic spline interpolation, we can estimate the temperature response on ambient temperature condition that is not stored in the look-up table.<>
本文介绍了一种通过测量不同环境温度下的导热系数来识别未知材料的高贵机器人传感器。设计了一种测量抓握物体热导率的主动传感器,并用C语言编写了材料判别软件程序。为了区分材料,需要制作查询表,其中存储了不同材料在不同环境温度下的温度响应。但在所有环境温度下存储数据是不切实际的。因此,利用三次样条插值,我们可以估计在环境温度条件下的温度响应,这些温度响应没有存储在查找表中。
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引用次数: 2
Fieldbus interface control IC 现场总线接口控制IC
Y. Yoshida, K. Mizoe, A. Matsuda, S. Kuroiwa
This paper introduces FRONTIER-1; the first chip developed for Fieldbus Interface which integrates complete functions including the modem and the transceiver required for implementing H1 Fieldbus Physical Layer Specification (Wire media, Voltage mode, 31.25 kbps). FRONTIER-1 contains high-voltage bipolar devices to drive the bus, analog circuits such as Op-amps, comparators and a voltage reference for drive control, voltage regulation and filters, and CMOS for the modem circuits. The integration of the transceiver and the modem was accomplished by using high-voltage Bi-CMOS process technology. On transmitting, FRONTIER-1 adds the frame delimiters and preambles to the messages supplied by a host CPU, generates FCS (Frame Check Sequence), and performs Manchester encoding. Transmitted digital signal is converted to the analog signal on the bus. On receiving, the signal on the bus is digitized, and modem circuits decode Manchester data and check FCS, and a host CPU reads the messages.<>
本文介绍了FRONTIER-1;第一个为现场总线接口开发的芯片,集成了实现H1现场总线物理层规范(有线媒体,电压模式,31.25 kbps)所需的调制解调器和收发器等完整功能。FRONTIER-1包含用于驱动总线的高压双极器件、模拟电路(如运算放大器、比较器和用于驱动控制的参考电压、电压调节和滤波器)以及用于调制解调器电路的CMOS。采用高压双cmos工艺技术实现了收发器与调制解调器的集成。在传输时,FRONTIER-1向主机CPU提供的消息添加帧分隔符和前导,生成FCS(帧检查序列),并执行曼彻斯特编码。传输的数字信号在总线上转换成模拟信号。接收到信号后,总线上的信号被数字化,调制解调器电路解码曼彻斯特数据并检查FCS,主机CPU读取消息。
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引用次数: 0
Physical significance of measurements in images 图像测量的物理意义
J. Rivest, P. Soille
In mathematical morphology, images are represented with sets. On binary images, sets delineate portions in the image plane, creating binary shapes. Measurements can be done on these shapes. It has been demonstrated that, for digital images, there exist very few basic measurements. These measurements, along with image transformations, generate all the possible measurements that can be done on an image. For binary images, all the measurements are based on the area, perimeter and connectivity number (number of connected components minus the number of holes inside them). Gray-tone images can also be modeled as 3-D sets. However the 5-D space is not homogeneous: units along the image plane are not the same as those on the intensity axis. This causes problems because not all the basic measurements are physically valid. The basic measurements on gray-tone images are the volume, surface, norm (or mean curvature) and the connectivity number. In this paper, we present a criterion to assess the physical validity of the basic measurements. This allows us to further limit the number of useful basic measurements. On gray-tone images, these are the volume and the connectivity number. We illustrate our findings with an experiment using physically valid and invalid measurements. These measurements are applied to texture characterization and segmentation. We study the behavior of these measurements under illumination changes. We show that a physically invalid measurement gives erratic answers under such circumstances. This has important consequences on the robustness of image analysis algorithms.<>
在数学形态学中,图像用集合表示。在二值图像上,集合划定图像平面上的部分,创建二值形状。可以对这些形状进行测量。已经证明,对于数字图像,存在很少的基本测量。这些测量与图像转换一起,生成了可以在图像上完成的所有可能的测量。对于二值图像,所有的测量都是基于面积、周长和连接数(连接组件的数量减去它们内部孔的数量)。灰色色调的图像也可以建模为3-D集合。然而,5维空间不是均匀的:沿着图像平面的单位与强度轴上的单位不相同。这就产生了问题,因为并非所有的基本测量都在物理上有效。灰度图像的基本度量是体积、表面、范数(或平均曲率)和连通性数。在本文中,我们提出了一个标准来评估物理有效性的基本测量。这使我们能够进一步限制有用的基本度量的数量。在灰色色调的图像上,这些是体积和连接数。我们用物理上有效和无效的测量来说明我们的发现。这些测量值被应用于纹理表征和分割。我们研究了这些测量在光照变化下的行为。我们表明,在这种情况下,物理上无效的测量给出了不稳定的答案。这对图像分析算法的鲁棒性有重要影响。
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引用次数: 1
Development of effective test method of radiant high frequency electromagnetic field immunity (IEC 801-3) 辐射高频电磁场抗扰度有效试验方法的发展(IEC 801-3)
K. Ishihara, K. Matsuo
For EMC (electromagnetic compatibility) of electronic equipment, it is necessary to not only reduce the electromagnetic waves radiated from the equipment but also raise the resistance against external electromagnetic waves. A test method for checking the level of this resistance against electromagnetic waves is currently under study as IEC Standard 801-3 but it has a big problem in the matter of test efficiency because of an enormous amount of test time required. Under such circumstances, we developed a simple and efficient test method which can be applied without sacrificing the reliability of the test and have the honour of reporting an outline of this method hereafter.<>
为了提高电子设备的电磁兼容性,既要降低设备的电磁波辐射,又要提高设备对外界电磁波的抵抗能力。目前,IEC标准801-3正在研究一种检测电磁电阻水平的测试方法,但由于需要大量的测试时间,因此在测试效率方面存在很大问题。在这种情况下,我们开发了一种简单有效的测试方法,可以在不牺牲测试可靠性的情况下应用,并荣幸地在此报告该方法的概述。
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引用次数: 0
Signal extraction from magnetic flowmeters for density measurements 电磁流量计的密度测量信号提取
H. Eren, J. Goh
DC type electromagnetic flowmeters generate signals proportional to the rates of flow of fluids in dosed pipes. These signals are processed and filtered suitably for flow measurements. Studies indicate that the generated signals carry secondary information on the characteristics of fluids, For instance, in slurry applications, the secondary information depends on the density of the slurry, the particle size distribution of solids and the types of materials used. The dependence manifests itself by having a frequency component and an amplitude component. A low-cost spectrum analyser is found to be effective in extracting the frequency dependent components. The amplitude variations of the signals can also be extracted using analog or digital techniques. A peak detector based on comparators and A/D conversion principles found to be capable of extracting the amplitude dependent components of the signals. By the use computers, the results obtained form the spectrum analyser and the peak amplitude detector can be correlated to the densities and other characteristics of slurries.<>
直流型电磁流量计产生的信号与加药管道中流体的流速成正比。这些信号经过处理和过滤,适合流量测量。研究表明,所产生的信号带有关于流体特性的二次信息,例如,在泥浆应用中,二次信息取决于泥浆的密度、固体的粒度分布和所用材料的类型。这种依赖关系表现为有一个频率分量和一个幅度分量。发现一种低成本的频谱分析仪可以有效地提取频率相关分量。信号的幅度变化也可以用模拟或数字技术提取。一种基于比较器和A/D转换原理的峰值检测器,能够提取信号中与幅度相关的分量。通过计算机,频谱分析仪和峰值振幅检测器得到的结果可以与浆料的密度和其他特性相关联。
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引用次数: 7
Sensing in an AC voltage standard 感应在一个交流电压标准
R. Lapuh, D. Fefer, J. Drnovsek, A. Jeglic, R. Rape
A digital AC voltage standard with well known AC to DC output voltage difference is described. The proposed feedback configuration can effectively measure and correct for loading effects, caused by a measuring device. Because the AC standard can generate AC and DC voltages at the same output terminals, automatic measuring setup for thermal voltage converters (TVC) is considerably simplified.<>
描述了一种数字式交流电压标准,它具有众所周知的交流与直流输出电压差。所提出的反馈结构可以有效地测量和纠正由测量装置引起的负载效应。由于交流标准可以在相同的输出端产生交流和直流电压,因此热电压转换器(TVC)的自动测量设置大大简化
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引用次数: 0
The influence of the penalty factor in order selection criteria 惩罚因素对订单选择标准的影响
P. Broersen, H. Wensink
The quest in autoregressive model order selection is for the model with smallest prediction error. The possibilities of selecting a suboptimal order can be divided in overfitting and underfitting. In order selection criteria based on asymptotical large sample theory as well as in their finite sample counterparts, the penalty factor /spl alpha/ can be considered as the balancing factor between overfit and underfit. An optimization of the value for the penalty factor is only effective, after a correction for the statistics of the finite observation length has been carried out, by using the results of the finite sample theory. A theoretical treatment is in asymptotic theory based on the true AR process order. To apply the reasonings to the practical situations, where only a finite number of observations has been measured, the optimal model order is introduced. It is defined as the order with lowest expected prediction error.<>
自回归模型阶数选择的目标是求预测误差最小的模型。选择次优阶的可能性可分为过拟合和欠拟合。在基于渐近大样本理论和有限样本理论的阶次选择准则中,惩罚因子/spl α /可以被认为是过拟合和欠拟合之间的平衡因子。只有在利用有限样本理论的结果对有限观测长度的统计量进行校正后,惩罚因子值的优化才有效。一种理论处理是基于真实AR过程顺序的渐近理论。为了将推理应用于实际情况,其中只有有限数量的观测值被测量,引入了最优模型顺序。它被定义为期望预测误差最小的阶数。
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引用次数: 0
A comparison of location methods for pinholes in pipelines 管道针孔定位方法的比较
K. Watanabe, M. Kakishima, K. Yokoyama
Here, we compare the two acoustic methods named cross-correlation and auto-correlation to locate pinhole locations in a gas-pipeline. The cross-correlation method that determines the location from the cross-correlation of two acoustic signals detected at two terminals of the pipeline is effective for pipelines with greater acoustic damping. Whereas the auto-correlation method that determines the location from the auto-correlation of the acoustic signal detected at one terminal of the pipeline is effective for those with less acoustic damping.<>
在这里,我们比较了相互相关和自相关两种声学方法来定位天然气管道中的针孔位置。通过管道两端检测到的两个声信号的相互关系确定位置的互相关方法对于声阻尼较大的管道是有效的。而对于声阻尼较小的管道,通过对管道一端检测到的声信号进行自相关来确定位置的自相关方法是有效的。
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引用次数: 5
Experimental determination of the time constant of a thermoresistive sensor 热阻式传感器时间常数的实验测定
R. Freire, J. Neto, G. S. Deep, A. Lima, P. C. Lobo
The thermal time constant of a thermoresistive sensor is defined in terms of its physical properties such as mass m, specific heat c, area A and overall heat transfer coefficient U to the surroundings. Measurement of these parameters (e.g. c and U) may involve lengthy experimental procedures. An experimental method using only electrical quantities, to determine the intrinsic thermal time constant, is described. In the proposed procedure, the physical properties of the sensor are not required. A formulation, to compensate for the measurement errors due to electrical heating of the sensor, is presented.<>
热阻式传感器的热时间常数是根据其物理性质,如质量m、比热c、面积a和对周围环境的总传热系数U来定义的。这些参数(如c和U)的测量可能涉及冗长的实验过程。本文描述了一种仅使用电量来确定本征热时间常数的实验方法。在建议的程序中,不需要传感器的物理性质。提出了一种补偿传感器电加热引起的测量误差的公式。
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引用次数: 8
期刊
Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)
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