共查询到14条相似文献,搜索用时 62 毫秒
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主轴径向回转误差评定的最小径向间距算法 总被引:1,自引:0,他引:1
林洁 《振动、测试与诊断》1991,11(2):15-20
本文提出一种用作主轴径向回转误差评定的新型的最小间距算法,该算法具有计算速度快又足够精确的特点。 相似文献
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单圈非重复性主轴回转精度的最小区域法评价 总被引:1,自引:0,他引:1
针对不具有单圈重复性的主轴回转精度的评价存在困难的问题,建立单圈非重复性主轴回转精度评价的数学模型,并使用这个数学模型,进行主轴回转误差的集合转换,使得转换后的集合能够适应于基于计算机处理的最小区域评价方法,然后利用极差极小化的原理,建立最小区域法的误差评定统一准则。在这个评判准则基础上,给出了具体的算法流程图以及移动步长的统一求解公式。利用算法可以顺利实现对单圈非重复性主轴回转精度的最小区域法评价,从而提高了单圈非重复性主轴回转误差评价精度和误差评价效率。 相似文献
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本文给出了机床主轴回转误差计算机辅助测试系统。该系统与传统测量系统相比具有测量精度高。数据处理能力强,操作方便等特点。 相似文献
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一种气浮主轴径向回转误差的测量方法 总被引:1,自引:0,他引:1
详细论述了双传感器转位法测量气浮主轴径向回转误差的基本原理,该方法能有效地分离出主轴的回转误差和标准钢球的圆度误差,通过消除一次谐波来去除安装偏心。并且设计了回转误差的测试系统,该系统能满足测量的要求。 相似文献
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以CY6140型普通车床主轴系统为研究对象,在集中参数模型的基础上,采用增广传递矩阵法,编制了机床主轴部件静动态特性计算的计算机程序,并应用该程序对机床主轴系统进行了静动态特性的分析计算。 相似文献
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重要抽样法误差的计算分析 总被引:4,自引:1,他引:4
用大量算例对重要抽样法计算结构失效概率的误差进行了计算分析,给出了误差分布的直方图,并研究了其特性。结果表明,重要抽样法的误差是一种随机误差,可用正态分布来很好描述。通过对计算结果的分析,得到了相对误差ε与抽样次数N之间的近似关系式,同时也对计算结果的变异系数COV与ε的关系进行了研究,为工程结构失效概率的模拟计算提供了一个保证精度的初步停机准则。 相似文献
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ALGORITHM FOR SPHERICITY ERROR AND THE NUMBER OF MEASURED POINTS 总被引:1,自引:0,他引:1
HE Gaiyun WANG Taiyong ZHAO Jian YU Baoqin LI Guoqin School of Mechanical Engineering Tianjin University Tianjin China 《机械工程学报(英文版)》2006,19(3):460-463
The data processing technique and the method determining the optimal number of measured points are studied aiming at the sphericity error measured on a coordinate measurement machine (CMM). The consummate criterion for the minimum zone of spherical surface is analyzed first, and then an approximation technique searching for the minimum sphericity error from the form data is studied. In order to obtain the minimum zone of spherical surface, the radial separation is reduced gradually by moving the center of the concentric spheres along certain directions with certain steps. Therefore the algorithm is precise and efficient. After the appropriate mathematical model for the approximation technique is created, a data processing program is developed accordingly. By processing the metrical data with the developed program, the spherical errors are evaluated when different numbers of measured points are taken from the same sample, and then the corresponding scatter diagram and fit curve for the sample are graphically represented. The optima! number of measured points is determined through regression analysis. Experiment shows that both the data processing technique and the method for determining the optimal number of measured points are effective. On average, the obtained sphericity error is 5.78μm smaller than the least square solution, whose accuracy is increased by 8.63%; The obtained optimal number of measured points is half of the number usually measured. 相似文献