共查询到20条相似文献,搜索用时 125 毫秒
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介绍了弹头外形轮廓误差综合测量的原理,以及直线和任意曲线轮廓的最佳拟合数学模型及误差评定方法,并结合测量结果分析了系统的性能。 相似文献
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根据某型飞行器瞄准系统的瞄准原理,分析了瞄准系统在使用过程中可能产生的误差。结合不确定度的评定理论,对瞄准系统在使用过程中的测量不确定度进行了评定。总结了瞄准系统测量不确定度评定对瞄准系统组件的生产以及使用过程中的重要意义。 相似文献
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介绍了模具刃口轮廓误差综合测量的原理以及直线、圆弧、任意曲线刃口轮廓的最佳拟合数学模型及误差评定方法,并结合冲裁模测量实例分析了测量系统的性能。 相似文献
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针对植物几何参数测量仪中原理误差的问题,建立了几何参数测量仪的实际传动特性方程,通过与理论的线性模型比较获得了仪器的原理误差函数式,分析了测量时接触变形误差对测量结果的影响问题,并在此基础上提出了减小原理误差的方案,借助数值分析方法,以增加测量臂长为例论述了减小原理误差的方法.研究结果表明,该方法具有广阔的推广应用前景. 相似文献
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车床主轴回转精度的测量是一项重要的测试课题。针对传统的测量方法需要使用基圆发生器,数据处理困难,测试结果难以在各车床间进行比较等问题,提出了利用数字式单向测量法对车床主轴回转误差进行动态测量。从分析回转误差的测试原理和误差性质出发,建立起回转误差的数学模型,利用信号分析的手段分离出基准球安装偏心误差,并通过计算机仿真对该数学模型及分离方法进行验证和分析。实验结果表明,采用本文的方法对C616主轴回转精度进行测量,其测量结果与DJ-HZ-1型机床回转精度测量分析仪的测量结果基本吻合。 相似文献
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阿贝原则再认识 总被引:3,自引:0,他引:3
为探究阿贝原则在现代超精密制造和测量中的适应性,回顾了古典阿贝原则及其扩展,剖析了要素布局产生的一次误差,研究了二维长度测量中的阿贝原则。通过分析测量系统的标准量、被测量、瞄准点、读数点、导向面5个要素的不同布局产生的误差,发现当标准量和被测量按经典阿贝原则要求处于同一条直线上,而其余要素不在这条直线上时,也会产生一次误差。提出了瞄准共线、读数共线、导向共线以及阿贝臂误差、瞄准臂误差、读数臂误差、导向臂误差和阿贝综合误差等概念。揭示了阿贝原则的隐含条件,重新表述了阿贝原则。讨论了上下堆叠式和共平面式二维结构的阿贝原则适应性,提出了一种提升工具显微镜精度的简明方案,介绍了一种减小阿贝误差的共平面二维精密工作台。对阿贝原则的再认识,可更新设计理念,用于研制超精密仪器和机械,也可用于经典量仪的精度再提升。 相似文献
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单轴飞轮储能与姿态控制系统误差分析 总被引:12,自引:8,他引:12
介绍了单轴飞轮储能及姿态控制一体化系统的总体构成和工作原理,研究并推导了系统的数学模型,分析了系统误差产生的原因,建立了转台角度位置误差与转子安装不同轴误差、转子偏心误差、飞轮速度测量与控制误差之间的误差关系式,并进行了误差合成。结合实际实验系统算出了各项误差,并对比和分析了各项误差。结果表明:影响系统位置精度的主要因素有飞轮安装不同轴误差、转动惯量误差和飞轮速度测量与控制误差等,其中飞轮转动惯量误差和飞轮安装不同轴误差是不可控量;而飞轮的转速测量与控制误差是可控量。最后提出了提高飞轮储能与姿态控制系统精度的主要方法,可以通过提高位置测量传感器和速度测量传感器的分辨率,采用先进的控制算法来降低飞轮的转速测量与控制误差。 相似文献
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针对ATOS系统,通过大量的试验研究了光学测量中误差产生的因素,得出了光线、振动、显像剂、参考点、系统参数为其影响测量误差的主要因素;并分析了各种因素对测量误差的影响,得出了其误差产生的具体来源,并根据误差产生的来源提出了预防措施. 相似文献
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《Measurement》2016
The error characteristics of the twin-cantilever sensor for measuring external diameter of tensile test piece were discussed. By using of beam bending theory and strain electric measurement theory, the origins of the errors of the twin-cantilever measuring system were analyzed, and a synthetic error formula of the system was established, which contains four components, the contact offset error, the tilt error, the Abbe error and the implicated error. A experimental system was designed, and the calibration and measurement experiments were carried out. The synthetic error formula was used to analyze the errors of the experimental system, and the error control method, including a set of error correction formula, was discussed. The analytical result shows that the resolution of the experimental system is smaller than 0.0002 mm; through error correction, the absolute error limit of the experimental system can be determined as ±0.001 mm. 相似文献
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一种新型三自由度虚轴坐标测量机机构的误差建模与仿真 总被引:1,自引:0,他引:1
设计了一种新型三自由度虚轴坐标测量机机构,给出了其运动学正解模型,依据全微分理论,导出测头位置误差与结构参数误差及3个并联驱动杆长度误差之间的相互关系,从而建立起这种新型并联机构的误差模型;然后利用计算机仿真方法,验证了误差模型的准确性,分析了3个并联驱动杆长度变化以及结构参数误差变化对测头位置误差的影响,为该虚轴坐标测量机机构的加工制造及其误差补偿奠定了理论基础,该并联机构还可用于运动模拟器、并联机床等其它并联运动装备. 相似文献
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小型精密X-Y工作台误差的理论分析及补偿 总被引:5,自引:1,他引:4
从理论上分析了小型精密X-Y工作台的各种误差。针对这些误关,给出一些确实可行的措施来减小机械系统的误差;用软件对系统的几种误差进行了补偿。在此基础上,讨论了工作台开环系统及闭环系统的精度。提出了测量导轨直线性误差的新方案,使测量方法的原理误差降低到完全可以忽略不计的程度。 相似文献
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A new model using approximate formulas is established to predict the error motions of hydrostatic thrust bearings. Three different types of geometric errors of thrust plates are listed in this paper including tilt errors, saddle shaped errors and petal shaped errors. The influences of them on lateral tilt error motion, longitudinal tilt error motion and axial error motion are discussed. Definitions of averaging coefficients are made based on the approximate formulas. It is found that the time-varying tilt errors are the main reason for the error motions of hydrostatic thrust bearings. The thrust bearings with six pairs of recesses have priority over the thrust bearings with four and three pairs of recesses in the view of rotation accuracy. Experiments are done using a hydrostatic rotary table with an outer diameter of 2 m. It is found that the second harmonic errors are the main component of the radial run-out and the results agree well with the results calculated from the approximate formulas. 相似文献
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Laser tracking system (LTS) is an advanced device for large size 3D coordinates measuring with the advantages of broad range, high speed and high accuracy. However, its measuring accuracy is highly dominated by the geometric errors of the tracking mirror mechanism. Proper calibration of LTS is essential prior to the use of it for metrology. A kinematics model that describes not only the motion but also the geometric variations of LTS is developed. Through error analysis of the proposed model, it is claimed that gimbals axis misalignments and tracking mirror center off-set are the key contributors to measuring errors of LTS. A self-calibration method is presented of calibrating LTS with planar constraints. Various calibration strategies utilizing single-plane and multiple-plane constraints are proposed for different situations. For each calibration strategy, issues about the error parameter estimation of LTS are exploded to find out in which conditions these parameters can be uniquely estimated. Moreover, these conditions reveal the applicability of the planar constraints to LTS self-calibration. Intensive studies have been made to check validity of the theoretical results. The results show that the measuring accuracy of LTS has increased by 5 times since this technique for calibration is used. 相似文献