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基于GPS的测量不确定度评定方法分析 总被引:1,自引:0,他引:1
本文阐述了新一代GPS不确定度理论的形成、发展,以及在实现几何产品规范设计与计量认证统一中的重要作用;基于测量不确定度贡献因素的分析,着重研究了测量不确定度的评定方法、模型及应用技术,为实现测量不确定度评定管理的规范统一奠定必要的技术基础。 相似文献
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新一代产品几何技术规范(GPS)中所提出的测量不确定度评定的黑箱模型,为实现几何量测量不确定度的规范、快速评定提供了必要的理论基础。本文通过GPS黑箱模型与自动控制领域内黑箱模型的对比,深入阐述了GPS黑箱模型的概念、原理及运行方式,分析研究了GPS黑箱模型应用过程中的关键技术问题。并进一步以三坐标测量机测量圆度误差的测量不确定度概算为例,对黑箱模型的应用进行了实例分析。 相似文献
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现代产品几何技术规范(GPS) 的不确定度理论及应用技术研究 总被引:5,自引:1,他引:4
新一代GPS(generation geometrical product specification)在测量不确定度的基础上扩展了不确定度的概念,将不确定度应用到几何产品的“功能、规范、认证”的全过程。文中着重分析新一代GPS不确定度的构成、相互关系及GPS过程量化统一的内在规律性;明确不确定度与操作算子之间的关系,揭示GPS不确定度理论的概念基础、应用规律及技术经济性;研究新一代GPS基本原则与不确定度之间的关系规律,给出减小GPS不确定度的对策和措施;并在此基础上,以产品质量认证为例,进一步分析研究GPS测量不确定度规范及其应用技术。 相似文献
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基于新一代GPS的产品检验符合性不确定度评定* 总被引:4,自引:0,他引:4
新一代产品几何技术规范将测量不确定度的概念拓展至符合性不确定度,但并未给出相对应的评定方法。为全面估计产品检验中测量结果与产品规范所有可能的差异,基于新一代产品几何技术规范,研究产品检验符合性不确定度评定。基于产品几何技术规范定义,提出规范不确定度、方法不确定度、符合性不确定度的评定方法;借助不确定度的黑箱模型,通过测量结果统计学量值特性指标,评定执行不确定度。以产品圆度检验为例,研究符合性不确定度评定操作过程,基于符合性不确定度划分产品检验的合格区间。实例分析结果表明,规范不确定度和方法不确定度的量值与执行不确定度相当,不可忽略;由于符合性不确定度包含测量结果与图纸规范所有可能的不一致性,基于符合性不确定度进行产品合格判定更为可靠。 相似文献
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针对常用的开放轮廓线性滤波器具有边界效应的缺点,提出采用滤波器权函数修正方法削弱边界效应的影响,并基于新一代GPS(geometrical product specification)线性轮廓滤波器的基本原理及不确定度贡献因素,分析权函数修正方法及其对不确定度概算的影响,给出开放轮廓滤波处理后的工件合格性判定准则.指出在对具有开放性轮廓的工件进行合格性判定时,需要将滤波后的不确定度概算和开放轮廓滤波边界效应的处理结合起来,从而充分利用原始轮廓信息,保证评定结果的完整性和有效性.最后结合直线度误差评定实例对文中理论进行实验验证. 相似文献
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Straightness error is an important parameter in measuring high-precision shafts. New generation geometrical product specification(GPS) requires the measurement uncertainty characterizing the reliability of the results should be given together when the measurement result is given. Nowadays most researches on straightness focus on error calculation and only several research projects evaluate the measurement uncertainty based on "The Guide to the Expression of Uncertainty in Measurement(GUM)". In order to compute spatial straightness error(SSE) accurately and rapidly and overcome the limitations of GUM, a quasi particle swarm optimization(QPSO) is proposed to solve the minimum zone SSE and Monte Carlo Method(MCM) is developed to estimate the measurement uncertainty. The mathematical model of minimum zone SSE is formulated. In QPSO quasi-random sequences are applied to the generation of the initial position and velocity of particles and their velocities are modified by the constriction factor approach. The flow of measurement uncertainty evaluation based on MCM is proposed, where the heart is repeatedly sampling from the probability density function(PDF) for every input quantity and evaluating the model in each case. The minimum zone SSE of a shaft measured on a Coordinate Measuring Machine(CMM) is calculated by QPSO and the measurement uncertainty is evaluated by MCM on the basis of analyzing the uncertainty contributors. The results show that the uncertainty directly influences the product judgment result. Therefore it is scientific and reasonable to consider the influence of the uncertainty in judging whether the parts are accepted or rejected, especially for those located in the uncertainty zone. The proposed method is especially suitable when the PDF of the measurand cannot adequately be approximated by a Gaussian distribution or a scaled and shifted t-distribution and the measurement model is non-linear. 相似文献
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现代产品几何技术规范(GPS)体系及应用分析 总被引:3,自引:5,他引:3
现代产品几何技术规范GPS(dimensional geometrical product specification and verification)是ISO/TC213针对产品的设计与制造而规定的一系列宏观和微观的几何技术规范,是所有机电产品的技术标准与计量规范的基础。随着全球经济的发展和科学技术的进步,尤其是随着CAD/CAM/CAQ(computer aided design/computer aided manufacture/computer aided quality)的应用和发展,新工艺、新技术、新材料的应用以及加工精度从微米到纳米的提高,ISO/TC213 GPS也随之发生了巨大的变化,已经由以几何学为基础的第一代GPS,发展到以计量学为基础的第二代GPS。文中在阐述ISO/TC213 GPS标准体系的形成、特点及发展趋势的基础上,对其构成思路及矩阵模型进行深入分析和研究,进一步揭示出其新一代GPS标准体系的构造模式规律及本质特征。 相似文献
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基于GPS的线性尺寸计量认证技术研究 总被引:1,自引:1,他引:0
基于对新一代GPS(dimensional geometrical product specification and verification)线性尺寸规范及其数字化理论基础的分析,揭示并阐明新一代GPS线性尺寸规范以产品功能特征为中心、以“规范设计”与“计量认证”统一为原则、以计量数学为基础的规范思路及内在规律性;基于计量学和操作技术,给出线性尺寸计量认证中、实现实体计量系统与虚拟计量技术互补的思路与方法,并进一步建立其线性尺寸数字化计量认证的关键操作——拟合的数学描述及线性规划模型,开发出线性尺寸数字化计量认证(软件工具)系统;并在此基础上,进一步给出基于GPS数字化技术的虚拟综合量规设计与应用方法,以满足产品特定的功能要求;并通过实例说明其工程价值及技术经济意义。 相似文献
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J.X. Wang X. Jiang L.M. Ma Z.G. Xu Z. Li X. Jiang 《The International Journal of Advanced Manufacturing Technology》2006,28(11-12):1169-1174
The decision rules based on measurement uncertainty are given in ISO 14253-1, according to which only measurement uncertainty is considered in the three-dimensional measurement process, and the workpieces are simply accepted or rejected by measurement uncertainty. It can be seen that the decision rules don’t accord with the basic requirements of the improved GPS system because correlation uncertainty and specification uncertainty are not taken into account, which are existent actually in a GPS process. In order to solve this problem, this paper presents the decision rules based on total uncertainty, according to which the workpieces should be accepted or rejected by total uncertainty. The biggest difference between the two decision rules is whether correlation uncertainty and specification uncertainty have been taken into account. For a given GPS specification, the key of the decision rules based on total uncertainty is to calculate the compliance uncertainty of the corresponding GPS standard-chain. According to ISO 17450-2, a GPS process should be either in the default state or in the special state. Aiming at the two states, the calculation method for compliance uncertainty of a GPS standard-chain is given respectively. It enables us to generate compliance uncertainty on the verification of a GPS specification, which means the acceptance or refusal of a GPS characteristic can be conducted in a quantitative way. The example of flatness least-square assessment indicates that the veracity of assessment could be improved . 相似文献