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该文介绍了某型综合测试仪中数字万用表模块的研究与实现方法。该模块以ASICES51986为核心,通过CPU(BF531 DSP)控制测量功能,处理测量数据并显示测量结果。较详细地介绍了ES51986的性能特点、控制方法和硬件电路设计思路;给出了前端衰减电路控制原理图,详细介绍了DSP对HC4094的控制和数字万用表前端衰减电路及软件设计流程图;最后分析了实际测量结果,提出了改良方法。测试结果表明,本数字万用表测量精度较高,操作简便、安全,测量功能可靠,能满足实际测量要求。 相似文献
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复杂工况下超声波液位测量系统的设计 总被引:1,自引:0,他引:1
阐述了超声波液位测量系统的基本组成;重点说明了一种满足复杂工况测量要求的超声波液位测量仪的设计,包括新型驱动电路,发射电路与接收电路之间的接口电路和信号处理电路等;提出了单探头超声波测量系统中减小盲区的方法;介绍了基于AVR系列单片机的智能化超声波液位测量系统,以及数据处理算法和温度补偿。经过测试,仪表实际测量误差为0.2%~0.8%,能够满足工业现场超声波测量的需要。 相似文献
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介绍一种用于测量锅炉送粉管内煤粉浓度的电容传感器,由于实现了非接触测量,故对流动无影响,而且测量值与整个管道流通截面上的煤粉总量成正比,提高了测量准确性,实验室测试表明,该传感器能基本满足实际测量的要求。 相似文献
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证据的冲突是导致证据理论融合结果不理想的重要因素,对证据冲突的处理一直是证据理论中要解决的关键问题。通过对多义度、不一致度和非特异度进行线性组合,提出一种新的证据不确定性度量方法。新方法能够更全面地涵盖证据体中所包含的不一致和非特异性两类不确定信息,使得证据不确定性度量结果所包含的信息更为完整。在此基础上,采用指数函数构造权重,对证据体进行预处理,然后采用DST、PCR2和PCR5进行融合。算例结果表明融合结果合理,新的证据不确定性度量方法有效。 相似文献
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Rituparna Chutia 《Applied Intelligence》2018,48(11):3928-3949
Similarity measure plays an important role in the decision-making process under an uncertain environment where parameters involved are linguistics terms. Mostly, similarity measure is discussed on generalized fuzzy numbers. However, a few efforts have been made to study this measure on interval-valued fuzzy numbers. Sometimes, methods involving interval-valued fuzzy numbers depict limitations and drawbacks. Moreover, some of the methods are just confined to interval-valued fuzzy numbers. Hence, these methods fail when similarity has to be determined between crisp-valued fuzzy numbers and interval-valued fuzzy numbers. Hence, a new method of similarity measure has been developed based on the concepts of geometric distance, heights and the radius of gyration of the interval-valued fuzzy numbers. Although the method is being discussed on interval-valued fuzzy numbers, yet it is not just confined to such numbers. This method can be applied efficiently to generalized fuzzy numbers too. The method seems to out-perform in many situations and overcome the drawbacks and limitations of existing methods. A few sets of fuzzy numbers are considered for a comparative study and draw out the out-performance of the proposed method. A real-life problem of risk analysis in poultry farming has been discussed using the proposed similarity measure. 相似文献
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In this paper, we propose the Fermatean fuzzy linguistic term set (FFLTS) based on the linguistic scale function. A new similarity measure between FFLTSs is constructed, which not only includes the linguistic scale function but also combines the cosine similarity measure and Euclidean distance measure, and then the related properties of the similarity measure are proven. A corresponding distance measure is obtained according to the relationship between the distance measure and similarity measure. Furthermore, we extend the Tomada de Decisão Interativa Multicritério (TODIM) method and the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) method to the corresponding distance measure under the Fermatean fuzzy linguistic environment. The main advantages of the proposed methods are that they can not only transform linguistic information effectively in different decision environments but also improve the adaptability of FFLTS in decision-making problems. Finally, a numerical example is provided to illustrate the effectiveness and feasibility of the proposed methods, which are also compared with other existing methods. The sensitivity analysis of the parameters and the influence of linguistic scale function on the ranking results are also discussed. 相似文献
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为了克服现有作积形式不确定性度量方法的缺陷, 基于边界域提出一种用改进粗糙度和知识粒度求和形式的粗糙不确定性度量公式. 与现有方法相比, 它同时考虑了由边界域和知识粗糙性产生的不确定性, 从理论上证明了集成后的不确定性度量值确实比单个影响因素产生的不确定性度量值大, 是一种更加合理的不确定性度量方法. 将该方法推广到基于严凸函数知识粒度情形, 得到一类度量粗糙集不确定性度量方法, 并研究了随划分变细时, 粗糙 度、改进粗糙度与所提出方法之间的关系. 最后设计了一组算例对它们进行比较, 比较结果表明, 所提出的方法对划分变细更加敏感.
相似文献19.
遥控靶车速度的数字测量方法 总被引:1,自引:0,他引:1
介绍了遥控靶车速度的数字测量方法,阐述了测量原理及速度推算,通过分析测量误差给出了电路设计,并对靶车在轨道上行驶的不同阶段进行了测试。实践结果表明:该速度测量方法准确度高、实用性强,具有一定的推广使用价值。 相似文献
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A comparative study of ranking methods, similarity measures and uncertainty measures for interval type-2 fuzzy sets 总被引:3,自引:0,他引:3
Ranking methods, similarity measures and uncertainty measures are very important concepts for interval type-2 fuzzy sets (IT2 FSs). So far, there is only one ranking method for such sets, whereas there are many similarity and uncertainty measures. A new ranking method and a new similarity measure for IT2 FSs are proposed in this paper. All these ranking methods, similarity measures and uncertainty measures are compared based on real survey data and then the most suitable ranking method, similarity measure and uncertainty measure that can be used in the computing with words paradigm are suggested. The results are useful in understanding the uncertainties associated with linguistic terms and hence how to use them effectively in survey design and linguistic information processing. 相似文献