共查询到19条相似文献,搜索用时 171 毫秒
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三点法误差分离技术理论分析 总被引:9,自引:1,他引:8
本文通过分析和研究国内外误差分离技术有关文献,建立了三点法测量和无约束最优化方法评定工件圆度误差、圆柱度误差的数学模型,并发现在应用该技术求解工件回转误差和圆柱度误差方面尚有不足,通过对一次谐波分离方法的研究,建立了精确求解工件回转误差和圆柱度误差的数学模型。 相似文献
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主轴回转运动精度的评定误差 总被引:5,自引:0,他引:5
利用刚体平面运动的瞬心理论,把主轴的回转运动作为刚体的平面运动来研究,定义了主轴的回转轴心误差的概念。提出了用回转中心误差定义的车削类主轴回转运动精度的评定误差和用回转轴心误差定义的镗削类主轴回转运动精度的评定误差的概念。并解决了加工精度与主轴回转运动精度的定量关系。 相似文献
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为了更加准确地评定用水平仪测量竖直轴系的倾角回转误差,利用水平仪测试数据中误差的组成成分,明确两维水平仪读数中的谐波成分与回转误差中的谐波成分的相互关系。基于已有的2种数据处理方法,提出了将测量数据转换到固定坐标系下2种新的处理方法。详细分析了4种数据处理方法的优缺点,其中一次谐振分离方法将回转误差中的一次谐振量成功分离,得到了完整的回转误差。通过改变铅垂度,对轴系回转误差进行8次测量,对比所辨识的参数,从而验证了该方法的正确性。 相似文献
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双运动副误差分离技术在圆度测量中的应用 总被引:2,自引:0,他引:2
基于对传统误差分离技术的研究,本文作者提出了一种新的“双运动副”误差分离技术,把它应用于圆度误差的测量中,可以克服传统方法带来的不足.仅利用一个传感头,进行一次安装调整就可简单方便地实现圆度误差的测量.分离掉主轴的回转误差,获得反映工件圆度误差的精确值. 相似文献
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主轴回转误差的信息特性分析 总被引:1,自引:0,他引:1
本文论述主轴回转误差的信息特性,指明了主轴回转误差的信源—信道—信宿,并推算出其信息熵的计算公式。通过对主轴回转误差的测量获得了信息,使原始不确定度得以减小,但仍有残留熵。文中推算了残留熵的计算公式、表示测量误差淹没信息作用的测量误差熵值和熵系数。最后对测量所得信号的处理及分析方法。作了讨论。 相似文献
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主轴回转误差Prony谱模型 总被引:4,自引:1,他引:3
本文提出了建立轴回转误差连续模型的Prony谱分析方法,并通过奇异值分解来确定误差信号中所含的谐波个数,为从根本上解决圆度与圆柱度误差分离技术中的“谐波抑制”问题奠定了基础。 相似文献
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Hiroshi Sato 《Mapan》2011,26(1):37-46
The precise and accurate roundness measurement is required year by year. The multi-step method is commonly used in the high-accuracy
measurement for the roundness. The multi-step method is the self-calibration of the roundness capable of performing highly-advanced
precise measurement. It depends on the reason that is able to separate measurement wave from the spindle rotation component
and the form component of hemispherical master. But the mathematical models of the roundness measurement using that method
are very complicated, describing numerous parameters and processes. So, recently, the Monte Carlo technique has attracted
increasing attention as a very useful method for uncertainty estimation. This paper describes influences of the indexing angle
accuracy and the noises generated by the roundness measuring machine, on the roundness measurements, both of which were analyzed
by the Monte Carlo simulation. Furthermore, an example of hemispherical master is compared with the actual measurement data
between when a reference guide plate is used utilizing the magnetic rotary encoder. 相似文献
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Considering the characteristics of roundness error, a new method for roundness error evaluation in the rectangular coordinates, named as Geometric Approximation Searching Algorithm, is presented in this paper. The principle and steps of the algorithm are described in detail. The mathematical formulas and program flowchart are given. At first the algorithm allocates a square and predetermines the ideal centre point as the initial reference point. The radius value of all the measured points are calculated by each corresponding vertexes of the square respectively. After each vertex of the square and the initial reference point are used as the ideal centre point to calculate the roundness error, the minimum difference of the radius is obtained. The judgment and arranged square can be done repeatedly. Finally, the roundness error value of the minimum zone circle is determined. The experimental results show that the roundness error can be evaluated effectively and accurately by using this algorithm. 相似文献
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测量与信息技术 总被引:4,自引:0,他引:4
测量是获取信息的重要手段。科学研究、生产、高科技发展都离不开测量。测量技术发展的重要特点是它与信息技术的融合,这是提高测量精度、在线和动态测量、复杂参数和复杂环境下测量、智能测量的需要。这一融合贯彻始终,它包括信号调制与解调、采样与重构、信号融合、数据压缩、滤波、信号变换、时间序列分析、谱分析、数据拟合与建模、模式识别、神经网络、仿真与虚拟、误差分离、误差补偿、冗余技术、决策与智能技术等,它们互相支持。章通过三坐标测量机误差补偿、圆度和轴系误差测量,以及大型工程的柔性坐标测量系统,介绍其在提高测量精度、优化、自标定、丢失信息自恢复、系统重组等方面的作用及其关键技术。 相似文献
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圆度误差目标函数凸凹性的研究 总被引:1,自引:0,他引:1
应用凸函数理论证明了圆度误差最小区域评定法的目标函数是二维欧氏空间R2 中的连续、不可微的凸函数 ,从而证明了目标函数的全局极小值的唯一性 ,并给出了实例 相似文献
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Nonlinear response is an important factor affecting the accuracy of three-dimensional image measurement based on the fringe structured light method. A phase compensation algorithm combined with a Hilbert transform is proposed to reduce the phase error caused by the nonlinear response of a digital projector in the three-dimensional measurement system of fringe structured light. According to the analysis of the influence of Gamma distortion on the phase calculation, the algorithm establishes the relationship model between phase error and harmonic coefficient, introduces phase shift to the signal, and keeps the signal amplitude constant while filtering out the DC component. The phase error is converted to the transform domain, and compared with the numeric value in the space domain. The algorithm is combined with a spiral phase function to optimize the Hilbert transform, so as to eliminate external noise, enhance the image quality, and get an accurate phase value. Experimental results show that the proposed method can effectively improve the accuracy and speed of phase measurement. By performing phase error compensation for free-form surface objects, the phase error is reduced by about 26%, and about 27% of the image reconstruction time is saved, which further demonstrates the feasibility and effectiveness of the method. 相似文献
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介绍了一种由程控型多齿分度台和高精度圆度仪组合而成的全自动误差分离装置,该装置能够使圆度仪主轴回转误差从被测工件测量结果中可靠分离,从而极大地提高了圆度测量不确定度,本文对该装置测量不确定度进行了分析。 相似文献
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基于AFM的靶丸表面轮廓仪设计及其测量精度分析 总被引:2,自引:0,他引:2
基于商用原子力显微镜(AFM)建立了靶丸表面轮廓测量仪系统,并对该系统的精密回转轴系进行了结构设计.为了评价系统的测量不确定度,进行了气浮轴系回转精度测试,确定了回转轴系的误差曲线,其最小二乘圆度误差为48 nm;同时对安装回转轴系后AFM的测量噪声进行了测试,并通过结构改进使静态噪声幅值降为约10nm.应用这一系统进行了靶丸表面圆周迹线的测量实验,实验测量出该系统运转测量时噪声幅值约13 nm,综合测量误差约49.7 nm,此测量精度可以通过回转轴系的误差分离来进一步提高. 相似文献
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为实现对微圆弧金刚石刀具刀尖圆弧的评价,提出了一种基于高分辨率扫描电镜图像的评价方法,并对刀尖圆弧轮廓提取、轮廓曲线拟合、圆弧度评价等算法进行了研究.首先,运用Canny边缘检测算子提取刀尖圆弧图像的二维轮廓数据,并用移动最小二乘法对该数据进行拟合,使所提取轮廓光滑化;接着,建立了基于最小二乘准则的刀尖圆弧评价模型,并采用二次序列规划法对模型进行求解;最后,分析了轮廓拟合误差、测量不垂直度误差对刀尖圆弧评价结果的影响,并计算了刀尖圆弧半径及圆弧度不确定度值.实验结果表明所评价微圆弧金刚石刀具的刀尖圆弧半径为30.213μm,圆弧半径不确定度为351 nm,圆弧度为0.114μm,圆弧度不确定度为24 nm.由评价结果可以看出,本文所提出的方法可以实现微圆弧金刚石刀具刀尖圆弧纳米级精度的测量及评价. 相似文献