MAGA-WNN模型在明胶浓度软测量中的应用

胶液浓度的测量在明胶的生产过程中是一项很重要的任务,为解决明胶浓度胶液手工检测中存在的滞后时间长、测量误差大等实际问题,将软测量技术应用到明胶的浓度测量中。通过对明胶生产工艺的分析,采用小波神经网络建立软测量模型,利用混合变异自适应遗传算法对模型参数进行优化。用现场采集并归一化后的120组数据做仿真实验,其中80组作为训练,40组作为预测。仿真结果表明,该算法迭代67次后误差平方和低于0.01并趋于稳定。证明混合变异自适应遗传算法可增强小波神经网络模型的鲁棒性和提高收敛速度。所以该算法用于明胶浓度的软测量中是可行的。     

氧化铝生产过程液位测量的方法研究

在铝冶炼生产过程中,槽罐液位测量是否准确,直接关系到生产是否正常进行。本文结合氧化铝液位测量情况,重点介绍斜插安装取压法的隔离原理、防堵原理,及取压管长度的测量方法,取压管材料尺寸选取及安装。将研究结果应用到氧化铝液位的测量上,经验证,斜插安装取压法在工业测量中对提高仪表运行周期、准确度及降低成本方面有效。     

大功率硅整流电能计量装置的改造

分析了造成大功率硅整流交流电能计量装置计量误差大的原因，介绍了具体的改造内容。通过改造减小了电能计量装置综合误差，节省了费用。     

一种改进的测量天线辐射效率的方法

介绍了一种改进的测量辐射效率的方法。这种方法是建立在维勒帽方法之上,分别在自由空间和维勒帽进行测量。改进了传统维勒帽方法中天线模型,将天线等效为一个线性二端网络,自由空间和维勒帽则看成是天线的负载。改进的天线模型精确地描述了天线位于维勒帽内的电磁特征,测量取得了好的结果,表明这是一种操作简便、测量精度高的测量天线辐射效率的方法。     

利用贝尔态的高效量子密钥分配协议

提出了一个建立在EPR关联之上的量子密钥分配协议,除了用作纠错部分之外,所有的量子位都对密钥生成有贡献,因此它是高效的,每个EPR对贡献密钥的两个位,所以本协议可以获得高容量,最后证明了该协议是安全的。     

大力值测试技术的现状与展望

针对大力值的特点必须采用一些特殊的测试技术.介绍了目前大力值测试技术的现状及发展.     

Development of Cutting Condition Monitoring System for ID-blade Saw Slicing Machine

1 Introduction There are two ways ,the multi-wire sawslicing method and the inner-diameter blade slicing method,re-cently used for cutting wafers froma single crystal ingot . Multi-wire sawbecomes more popular iningot slicingprocesses ,because it has an advantage for slicinglarge diameter or long siliconingot and has efficiency for massproduction.However ,this method is difficult to control the wire cutting the ingot along its crystal orientationandit is less correspond to the request of some …     

Measurement of the parameters of the acoustic emission when metals are stretched acoustic measurements

The particular features of the measurement of the continuous acoustic emission when metals are stretched are considered. It is shown that the measured physical quantity should be the intensity of the acoustic radiation. Sources of systematic error are indicated, namely, the rigidity of the testing machine, the rate of displacement of the mobile crossarm, and the dimensions and shape of the samples. __________ Translated from Izmeritel’naya Tekhnika, No. 5, pp. 64–68, May, 2006.     

Accuracy of a Bellows vacuum meter with an LC-generator

Errors of pressure measurement are considered. The error as a function of the pressure for a vacuum gauge rated at up to 1000 Pa is calculated as an example. It is 0.15 ≤ δp/p ≤ 0.2% over a pressure range of 14 ≤ p ≤ 1000 Pa and it increases hyperbolically up to 100% with p = 0.01 Pa. The parametric reliability of the instrument and its immunity to an accidental increase in pressure the atmospheric level is substantiated. __________ Translated from Izmeritel’naya Tekhnika, No. 9, pp. 37–41, September, 2006.     

A study of the optimal measurement placement for parameter identification of orthotropic composites by the boundary element method

This paper concentrates on the design of the optimal measurement placement for the parameter identification of two-dimensional orthotropic composites, which is modeled by the boundary element. From the analysis of the well-posedness of the parameter identification processes using the Levenberg–Marquardt method, a performance indicator and an estimation of the maximum bias of identified parameters are deduced. Based on these results, a method for selecting the optimal measurement placement is proposed. The validity of this method is illustrated by some numerical examples. These examples reveal that the measurement placement has significant influence on identification results. Furthermore, an iterative process of selecting measurement placement is suggested for practical implementation.