共查询到20条相似文献,搜索用时 93 毫秒
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讨论了航空平显火控系统的原理误差、测量参数误差和显示器误差,分析了原理误差在建立瞄准数学模型中产生的原因,测量误差在火控计算中所使用的参数通过传感器测量而造成的问题,以及显示误差和其他误差带来设备误差等的形成及结果,并对数学模型的简化引起的误差、显示器误差、瞄准误差和系统误差等几个主要误差提出了解决方法及补偿措施。 相似文献
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研究了机床调整参数误差对双重螺旋法加工的螺旋锥齿轮小轮齿面误差的影响规律。基于齿轮啮合原理,使用MATLAB软件建立误差齿面方程,推导出了含机床调整参数误差的齿面离散点误差解析式,获得了对应机床调整参数误差的凹、凸两齿面误差拓扑图,分析了机床调整参数误差与齿面误差的映射关系,确定了对齿面误差影响较大的调整参数。借助2阶曲面对齿面误差拓扑图的近似表达,得出机床调整参数误差对齿面误差的影响权重。基于齿面误差及两齿面误差敏感矩阵,建立了齿面误差修正模型,通过广义逆矩阵的最小二乘法解超越方程组,获得机床调整参数的修正量。最后通过实例验证了误差齿面的修正效果,结果表明修正后凹凸两面的齿面误差大幅下降。 相似文献
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根据现行润滑理论的分析计算和轴承实验方法,分析了误差产生的原因。主要分析论证了理论假设误差、条件简化误差、实验误差和公式拟合误差,其误差导致了理论计算与实际测试产生较大的误差。着重分析研究误差产生的根源和误差形成的基础,为设计计算提供有效减小误差的方法。 相似文献
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Geometric error measurement and compensation for the rotary table of five-axis machine tool with double ballbar 总被引:2,自引:1,他引:1
Yi Zhang Jianguo Yang Kun Zhang 《The International Journal of Advanced Manufacturing Technology》2013,65(1-4):275-281
This paper proposes a novel measuring method for geometric error identification of the rotary table on five-axis machine tools by using double ballbar (DBB) as the measuring instrument. This measuring method greatly simplifies the measurement setup, for only a DBB system and a height-adjustable fixture are needed to evaluate simultaneously five errors including one axial error, two radial errors, and two tilt errors caused by the rotary table. Two DBB-measuring paths are designed in different horizontal planes so as to decouple the linear and angular errors. The theoretical measuring patterns caused by different errors are simulated on the basis of the error model. Finally, the proposed method is applied to a vertical five-axis machining center for error measurement and compensation. The experimental results show that this measuring method is quite convenient and effective to identify geometric errors caused by the rotary table on five-axis machine tools. 相似文献
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激光调阻机多档测量误差的软件自适应校正 总被引:3,自引:0,他引:3
为了减小激光调阻机测量系统的多档测量误差对阻值修调精度的影响,提出了一种基于有源单臂电桥测量原理自适应地校正激光调阻机多档测量误差的方法.通过测量和标定高精度标准电阻的测量误差,自适应地获取校正激光调阻机多档测量误差的系列修正值,进而用系列修正值对所有待修调电阻的阻值测量误差进行校正,达到进一步减小系统测量误差的目的.实践证明,在测量硬件电路保证高稳定性、微小波动性测量的前提下,应用该方法可使测量系统的精度指标达到:低阻区(R<100Ω)为±0.5‰;中阻区为±0.2‰;高阻区(R≥1MΩ)为±2‰. 相似文献
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数控机床误差补偿技术及应用测头系统误差分析和补偿技术 总被引:3,自引:0,他引:3
在机测量是机床加工过程质量监控的重要手段。文章对触发式测头的结构、测量原理、测头系统和测量过程中的误差源进行分析和处理,给出误差补偿和控制措施,以提高测量精度。该技术对推广和应用在机测量技术有重要意义。 相似文献
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E.S. Lee M. Burdekin 《The International Journal of Advanced Manufacturing Technology》2001,17(7):508-515
To measure the volumetric error of coordinate measuring machines (CMMs), a hole-plate artifact method was studied. Example
designs of the hole-plate are shown using titanium and ceramic materials. The deflection by its own weight of the designed
hole-plate is analysed using the finite element method. The hole distances moved by the deflection are shown in different
hole-plate set-up cases, for vertical and horizontal positions. The influence of inside hole roundness as a measuring standard
is also studied. Eccentric errors for different hole roundness are simulated. The hole-plate set-up errors are also discussed.
A method for obtaining the parametric errors of a CMM is shown using the hole-plate as a measuring artifact for CMM positioning
error. In addition, a method for measuring 2D and 3D length errors using the hole-plate data is introduced. 相似文献
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Shen-wang Lin Ping-ping Wang Ye-tai Fei Cha’o-kuang Chen 《The International Journal of Advanced Manufacturing Technology》2006,30(9-10):879-886
It is necessary to study the transferring effect of every error resource of a coordinate measuring system. This paper gives quantitative analysis of the transferring effects of parameter errors in a non-perpendicular coordinate measuring system. A typical articulation-type coordinate measuring system is analyzed which combines six angle encoders and three measuring arms and one stylus. The measuring equation of this system is given and the error-transferring model is derived from this equation. As the systematic errors of the parameters of the system are given beforehand, simulated computation is carried out on the error-transferring model of this articulation-type coordinate measuring system. The effects of parameter errors on the position of the stylus of the coordinate measuring system are clearly seen from the simulation results. These make the software error correction of the coordinate measuring system possible and will also provide the base for error correction of the system. 相似文献
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Measurements with a scanning stage cytophotometer are subject to systematic errors. Residual distributional error, diffraction error and glare are due to physical limitations in measuring diaphragms and step width. These errors mainly depend on the ratio measuring stop/object size, mean local absorbance and shape of the measuring object. Small dense objects give rise to increasing inaccuracy. These errors were minimized by a set of easily handled equations, making use of the area and mean local absorbance only. These equations are easily incorporated in scanning programmes. The usefulness of this correction was demonstrated in Feulgen-stained preparations. 相似文献