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混合多步误差分离技术 总被引:6,自引:1,他引:5
本文提出了一种可完全消除多齿法中谐波抑制问题的误差分离方法——混合多步误差分离法,并通过计算机仿真对该方法进行了验证。结果表明,混合多步误差分离法可将计算方法的准确度由纳米级提高到亚纳米级。 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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论述了多步法回转误差分离算法的技术原理,提出了频域混合补偿法误差分离算法,通过分析采集到的误差数据中主轴回转误差、圆度误差等成分的频域特性,利用傅里叶变换得到误差的谐波分量,通过剔除、补偿等方式分离偏心误差、圆度误差,从而得到主轴回转误差,该算法能很好地解决谐波抑制问题。通过圆度仪在工作现场采集数据进行仿真分析,实验验证该方法的可行性,并用最小二乘法对结果进行评定。三、四、五步法得到的圆度误差评定值与厂家给出的圆度误差40 nm间的差分别为118 nm、113 nm、145 nm,而频域混合补偿法分离出的圆度误差评定值为54 nm,与40 nm仅相差14 nm,可以看出频域混合补偿法对误差的分离效果明显优于多步法的误差分离效果。 相似文献
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圆度误差分离技术中若干问题的探讨 总被引:5,自引:0,他引:5
由Talyrond 3型圆度仪、精密分度转台和IBM-PC微机组成了计算机辅助纳米级圆度测量系统,它采用多步法误差分离技术,将圆度仪的测量精度由原来的0.025μm提高到0.002μm。讨论了多步法的原理、方法误差能及分度转台设计中的几个问题。 相似文献
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超精密工件在线直线度多传感器测量方法 总被引:2,自引:0,他引:2
在超精密加工中,用多测头方法测量工件直线度时,需要采用误差分离的方法分离出溜板的运动误差,并用一定的算法重构工件表面的直线度.介绍了现有的各种算法,提出了两种新的无理论误差的精确算法以重构工件的直线度.该算法适应于两点法或三点法测量长短工件,能评价任意(包括光滑、非光滑、周期和非周期等)表面,并允许采用大的测头间距.仿真及实测结果表明了算法的优越性,并采用该方法对自研的大理石超精密机床的直线度进行了检测. 相似文献
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本文介绍齿轮啮合分离测试技术的测量齿轮误差修正技术,它运用最小区域法计算测量齿轮的压力角和螺旋角误差对其进行修正,利用切比雪夫多项多拟合测量齿轮的形状误差进行修正,试验结果表明修正技术可大大降低了测量齿轮精度要求,能使工作的配对件作为测量齿轮。 相似文献
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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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制奋了聚二甲基硅氧烷和多孔聚丙的复合膜,并分别用以分离O_2、N_2和以渗透汽化法分离乙醇—水混合物。结果表明,当复合膜较薄时,膜的选择性对气体保持不变,而对渗透汽化法却大幅度下降。说明尽管气体膜分离与液体混合物的渗透汽化分离都遵循“溶解扩散”机理,但是溶解和扩散对选择性的贡献在两种情况下,程度是不同的。计算了氧、氮、乙醇和水的透过活化能,分别为6.7KJ/mol、10KJ/mol、32.6KJ/mol和35KJ/mol.建议气体分离膜在室温操作而渗透汽化膜在较高温度操作。 相似文献
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基于误差分离技术的圆度误差检测方法 总被引:5,自引:0,他引:5
误差分离技术足精密检测领域的一种先进技术。本文以圆度误差检测为例,介绍了误差分离技术的基本原理、基本方程的建立及分析方法。 相似文献
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P. R. Viswanath 《Sadhana》2007,32(1-2):83-92
Separation control has received considerable emphasis in literature both owing to fundamental flow physics and technological
applications. Flow separation generally leads to increased energy losses, instability and so on, and its control is essential
to improve aerodynamic performance. Here a brief review is presented of three broad strategies for separation control: these
include methods that involve energization of the boundary layer upstream of separation, those that involve altering the bubble
flow or dead air zone, and those that may influence the shear layer reattachment directly. Examples from recent research in
our laboratories are reviewed and it is suggested that direct manipulation of the reattachment process could lead to effective
control/management. 相似文献
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气体分离膜应用的现状和未来 总被引:7,自引:0,他引:7
考虑了气体分离膜应用和气体传递机理的各种技术.现在商业气体分离膜应用的范围包括:富氮、富氧、氢回收、从天然气中除去酸性气体(CO2和H2S)、天然气脱水和有价值的挥发有机物(VOCs)的回收.讨论了每一个应用中可用膜材料的现状和限度,及有潜在力的若干新膜的应用,如乙烯/乙烷分离和燃料电池. 相似文献
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介绍了有机蒸气分离膜的分离原理,并分别介绍了有机蒸气分离膜在石油化工、聚氯乙烯行业中的应用. 相似文献
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JÜRGEN TOMAS 《Particulate Science and Technology》2013,31(2):169-187
The separation characteristics of particles’ settling velocity, size, density, and shape are introduced, and the equivalent settling condition for laminar, transition, and turbulent flow are explained. A similarity model of particle transport in a turbulent flow field is briefly discussed. Typical operation principles in separation devices for counter current and cross-flow separation are presented. The separation function, cut point, sharpness, and separation stage utilization coefficient are determined to assess the efficiency for process sequences for multistage turbulent cross-flow separation. Satisfactory to very good results were achieved in the difficult separation of a partially liberated aggregate consisting of hardened cement paste rubble with sharpness from 0.66 to 0.94 at separation stage utilization coefficients of 7 to 87%. Specific mass flow rates of 3 to 16 t/(m2 · h) and mass related energy consumption of 0.2 to 8 kWh/t were obtained. 相似文献
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The separation characteristics of particles' settling velocity, size, density, and shape are introduced, and the equivalent settling condition for laminar, transition, and turbulent flow are explained. A similarity model of particle transport in a turbulent flow field is briefly discussed. Typical operation principles in separation devices for counter current and cross-flow separation are presented. The separation function, cut point, sharpness, and separation stage utilization coefficient are determined to assess the efficiency for process sequences for multistage turbulent cross-flow separation. Satisfactory to very good results were achieved in the difficult separation of a partially liberated aggregate consisting of hardened cement paste rubble with sharpness from 0.66 to 0.94 at separation stage utilization coefficients of 7 to 87%. Specific mass flow rates of 3 to 16 t/(m2 · h) and mass related energy consumption of 0.2 to 8 kWh/t were obtained. 相似文献