共查询到19条相似文献,搜索用时 140 毫秒
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该文介绍了蒙特卡罗法以及不确定度问题,当采用不确定度传递律进行测量不确定度评定(GUM方法)有困难或不方便时,蒙特卡罗法是实用的替代方法。 相似文献
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随着计量认证、实验室认可评审所依据的标准版本的更新,对测试结果的测量不确定度要求越来越明确.ISO/IEC 17025中有7处涉及到测量不确定度,标准中5.4.6条款专门讲的是"测量不确定度的评定"要求.因此,实验室管理向ISO/IEC 17025过渡时,测量不确定度的评定是实验室必须要解决好的重要问题之一.实验室在评定和报告测量不确定度时,应遵照<测量不确定度评定与表示>(JJF1059-1999)的要求,给出一个正确的表述.在无线电测量领域,对测量不确定度的评定有其自身的特点,即使对给定的同一参数,由于对评定计算的不同理解,得到的标准不确定度及合成标准不确定度结果不同,导致无法作出测量结果的符合或不符合判定.目前,国内在这一领域的相关标准还未出台,本文通过对ETSI(欧洲电信标准协会)技术报告(ETR 028)的理解,较详细给出无线电指标测量中测量不确定度的评定过程,供相关人员参考. 相似文献
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刘恒 《无线电技术与信息》2005,(7):4-16
随着计量认证、实验室认可评审所依据的标准版本的更新,对测试结果的测量不确定度要求越来越明确。ISO/IEC17025中有7处涉及到测量不确定度,标准中5.4.6条款专门讲的是“测量不确定度的评定”要求。因此,实验室管理向ISO/IEC17025过渡时,测量不确定度的评定是实验室必须要解决好的重要问题之一。实验室在评定和报告测量不确定度时,应遵照《测量不确定度评定与表示》(JJF1059—1999)的要求,给出一个正确的表述。 相似文献
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该文对应用5520A建立六位半及以下数字多用表计量校准装置的测量不确定度评定进行了详细分析;对测量原理、测量方法、数学模型、方差及传播系数、不确定度来源也作了描述;可以作为撰写数字多用表计量标准技术报告的参考资料. 相似文献
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《电子科技文摘》2006,(11)
0627087小型化新型宽频带环形电桥〔刊,中〕/张鹏飞//西安电子科技大学学报(自然科学版).—2006,33(4).—593-597(D)0627088电容法水分测定仪测量结果的不确定度评定〔刊,中〕/李作良//河南科技大学学报(自然科学版).—2006,27(4).—15-17(L)以小麦为样本,对使用电容法水分测定仪测量定其水分的测量结果标准不确定度进行了系统的分析和评定,并编写了相应的计算程序,对测量结果不确定度评定中的建模、分量计算、合成标准不确定度的评定和计算方面作了有益的尝试。本分析对相关测量不确定度的评定方法和数据处理的运算提供了参考。参80627089… 相似文献
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Zhi-Jie Pan Ya-Chuan Tai 《Reliability, IEEE Transactions on》1988,37(4):421-423
The authors present an algorithm to compute variance importance, a measure of uncertainty importance for system components. A simple equation has been derived for the measure, and Monte Carlo simulation is used to obtain numerical estimates. The algorithm overcomes NP-difficulty (non-polynomial difficulty) which exists in earlier methods for computing uncertainty importance, and is simpler, more accurate, and more practical. Moreover, it shows the direct relationship between probabilistic importance and uncertainty importance. An example illustrates the evaluation of Monte Carlo variance importance for a sample system 相似文献
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由于被测对象相距较远,高精度的公共测量基准难以建立,因此大尺寸空间角测量的难度较大。为了解决大尺寸条件下空间角的现场测量问题,提出一种基于惯性基准的大尺寸空间角测量方法。首先,阐述了大尺寸空间角的测量原理并且设计了测量系统。然后,对测量系统中基于二维振镜的光轴指向不确定度进行了研究,重点分析了各类误差对光轴指向不确定度的影响。最后,利用蒙特卡洛仿真对各项误差所引起的光轴指向不确定度进行评定,为光轴跟踪装置的误差分配及其指向精度的现场评估等工作奠定了基础。 相似文献
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This paper presents a new Monte Carlo method to estimate the reliability of a large complex system represented by a reliability block diagram or by a fault tree. Two binary functions are introduced; one dominates the system structure function and the other is dominated by the structure function. These functions can be constructed easily by using part of path sets and cut sets of the system. Through the use of these binary functions, two variance-reducing techniques (control variate and importance sampling) are applied to the Monte Carlo evaluation of the system reliability. We prove that the new Monte Carlo method gives a reliability estimate with a smaller variance than that of the crude Monte Carlo method. 相似文献
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不确定度作为表征测量结果的一种形式,意味着对测量结果的可信度或有效性的怀疑程度.在实际测量中,由于测量人员、工具或者外界因素的影响,导致测量结果以一定规律分散在特定的区域.不确定度是说明被测量之值分散性的重要参数.本文主要讨论光栅式指示表检定仪的不确定度评定,通过分析其主要误差来源而得到不确定度,从而为指示表类量具的检... 相似文献
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Markov-reward models are often used to analyze the reliability and performability of computer systems. One difficult problem therein is the quantification of the model parameters. If they are available, e.g., from measurement data collected by manufacturers, they are: (a) generally regarded as confidential; and (b) difficult to access. This paper addresses two ways of dealing with uncertain parameters: (1) sensitivity analysis, and (2) Monte Carlo uncertainty analysis. Sensitivity analysis is relatively fast and cheap but it correctly describes only the local behavior of the model outcome uncertainty as a result of the model parameter uncertainties. When the uncertain parameters are dependent, sensitivity analysis is difficult. The authors extend the classical sensitivity analysis so that the results conform better to those of the Monte Carlo uncertainty analysis. Monte Carlo uncertainty analysis provides a global view. Since it can include parameter dependencies, it is more accurate than sensitivity analysis. By two examples they demonstrate both approaches and illustrate the effects uncertainty and dependence can have 相似文献
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The paper proposes a numerical method to combine random variables. The method is based on representing a distribution by a histogram with equal probability intervals. This is an improvement on the Monte Carlo technique. An example is given to illustrate the use of the method in Reliability, involving the evaluation of the top event probability of a fault-tree with s-dependent cut sets. 相似文献
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信号发生器是科研和生产中应用非常广泛的一种仪器,频率调制是其最主要和基本的一种模拟调制功能。该文主要介绍在信号发生器计量中对调频频偏测量结果的不确定度评定的一种方法,希望对计量工作人员在计量信号发生器时提供一些参考。 相似文献
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Monte Carlo simulation appears to be very useful in the evaluation of K-terminal-reliability of large communication systems because the exact algorithms are extremely time consuming. This paper shows that the well-known series-parallel reductions can be incorporated in the recursive variance reduction simulation method, leading to a more efficient estimator, as demonstrated by experimental results 相似文献
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为了满足100m~3km特长焦距参量的测试校准需求,采用Talbot-Moiré条纹技术法,设计了一套长焦测焦仪。针对影响仪器测量不确定度的系统参量,分别设计了校准方法,并对仪器测量不确定度评定结果进行了实验比对验证。结果表明,校准后仪器测量不确定度评定为6.4%;校准后的长焦测焦仪测量结果与刀口仪测量结果满足测量不确定度比对公式;对比结果最大为0.64,小于1;长焦测焦仪测量不确定度评定合理。该研究验证了长焦测焦仪系统参量校准方法的可行性。 相似文献