共查询到18条相似文献,搜索用时 125 毫秒
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根据电感平衡原理,设计了用于磨粒在线测量的电感式磨粒传感器.分析了传感器的测试原理和磨粒通过传感器线圈时径向分布对测试结果的影响.通过计算线圈内测试面的磁场分布,提出了提高线圈测试面磁场均匀性的设计准则.建立了磨粒位置偏离线圈中心时,磨粒磁化场的磁通求解模型.模型计算结果表明,磨粒径向位置的改变,使得线圈各横截面上磁化场的磁通发生了变化.当线圈达到一定长度后,磁化场的磁链变化很小.因此在保证传感器线圈测试面磁场均匀性和线圈长度的前提下,磨粒径向分布对测试结果的影响可忽略.研究结论为分析电感式磨粒传感器测试结果一致性和优化传感器的结构设计提供了理论依据. 相似文献
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滑油屑末传感器基于磁场微平衡技术,能定量区分铁磁性和非铁磁性颗粒,可以为大型旋转部件健康监测提供重要数据.基于COMSOL建立有限元模型,分析了微平衡磁场下不同椭球磨粒和圆柱磨粒磁化场,并采用ANSYS Maxwell建立滑油屑末传感器模型,研究了不同长径比圆柱磨粒通过滑油屑末传感器时信号强度的变化.结果 表明,铁磁性颗粒经过平衡磁场时,轴线位置上磨粒中心处磁感应强度最大,随着离中心点距离增加磁感应强度衰减;切线位置上磁感应强度随着空间位置变化而改变,在切点处最小.对于不同的铁磁性颗粒形态,当磨粒体积相同时,长径比越大磁感应强度越大,信号强度越大.同时,搭建了滑油屑末测试系统,验证了有限元分析结果的正确性. 相似文献
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为了提高油液管道直径增加后感应区磁场均匀性,减小测量误差,根据电磁感应原理,设计了一种新型的在线油液 磨粒监测传感器。传感器使用一组安匝比为15/7/15的平面线圈在直径1mm的油管中产生均匀磁场以提高传感器探测金属磨粒的性能,使用COMSOL建立线圈模型并仿真,传感器线圈产生的磁场在感应区60%范围变化率小于1%,相同磨粒在油管径向不同位置的电感变化误差平均值为5%,根据仿真设计制作线圈实物,传感器能测量和分辨粒度100μm 铁磨粒和100μm 铜磨粒,同一磨粒位于管道轴线和管壁的电感变化误差不超过6.25%。仿真研究和实验结果证明新模型在管道径向产生的磁场更加均匀,可以有效减小粒子在管道径向运动带来的误差。 相似文献
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磨损颗粒是造成机械故障的重要因素,对磨粒的检测一般采用螺线管传感器。以螺线管传感器为基础,研究线圈多层缠绕的情况,并提出一种三线圈内外层结构传感器。依据电路理论,推导传感器工作等效电路和多层线圈磁感应强度、电感公式。基于Maxwell软件,比较内外层式和平行式磨粒传感器的磁场,分析线圈缠绕层数对传感器输出特性的影响。仿真结果验证了公式的正确性,为多层线圈磨粒传感器的设计、优化提供了基础。 相似文献
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近年来,油液监测技术领域的研究和开发的热点集中在油液在线监测方法上。为此提出一种电涡流式基于PCB平面线圈传感器的油液磨粒监测方法,首先通过电磁仿真软件Maxwell进行平面线圈的电磁仿真,获得最优PCB平面线圈的结构设计;然后采用电桥法设计了传感器测量电路,运用模数转换原理设计了信号调理电路;最后制备了此传感器。经过试验,其结果表明:该传感器具有良好的线性度及灵敏度。该研究为微型传感器加入油液磨粒监测技术提供一种可行的方法,不仅缩小了传感器体积,而且降低了监测成本。 相似文献
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机械传动金属磨粒可以反馈机械设备故障的特性,针对机械传动系统故障在线检测需求,提出了一种三线圈电感式金属磨粒检测系统;通过建立传感器数学模型,对影响传感器金属探测灵敏度的参数进行仿真,结合传感器实际使用情况求出最优解;通过设计励磁信号源模块、调幅模块、信号调理模块等电路并结合上位机对油液中的金属磨粒进行检测;经孔径为8 mm的流道的实验测试,实现了500μm铁磨粒及1 000μm铜磨粒的检测精度;该系统为发动机中金属磨粒的检测提供了技术支持,对故障预防与诊断具有重要意义。 相似文献
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为了满足国内新研航空发动机磨损故障预测及健康管理研究要求,国内研究机构开展了油液在线式磨粒传感器的研究及测试。针对航空发动机油液磨粒传感器暂无准确量值、多参数组合的专业测试条件,提出了一种将精密直线运动控制与振动环境相结合的无介质测试平台技术方案,模拟发动机中润滑油流经传感器的运动状态并给出实验结果。实验结果表明该测试平台能够有效地应用于磨粒传感器的参数测试和性能探究,为航空发动机故障预测类传感器的技术研究提供了一种新的测试验证手段。 相似文献
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基于模糊聚类分析的彩色磨图像目标提取 总被引:4,自引:0,他引:4
运用模糊聚类分析的模糊C-均值算法(FCM算法)。针对两类彩色显微磨粒图像,选用适当的正交彩色特征,实现了对磨粒目标的有效提取。并考虑在一维分割特征向量情况下,通过引入直方图统计特性,实现了模糊C-均值算法的快速运算。本文算法为磨粒识别和机械磨损状态监测及故障诊断提供了可靠的前提。最后,分割实验表明了本文方法的简洁有效性。 相似文献
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基于微机图象处理的滑油磨粒测量与分析系统 总被引:3,自引:0,他引:3
介绍了一种滑油磨粒测量与分析系统。该系统运用计算机图象处理技术,对机械设备滑油中磨粒显微形态测量与分析,并给出设备当前磨损状态的铁谱报表和诊断结论。监测实例表明,该系统显著地提高了状态的铁谱报表和诊断结论。监测实例表明,该系统显著地提高了机械设备磨损状态监测与故障诊断的准确性和自动化水平,具有较高的推广应用价值。 相似文献
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The object extraction of a debris image is an important basic task in identifying wear particles in ferrographic analysis.
However, there is some difficulty in object extraction because of noise jamming in the original debris image. In the present
study, two methods of image enhancement—weighted mean filtering and adaptive median filtering—were applied in order to improve
the image quality. Then, the adaptive thresholding selection method was used, which is based on an improved debris image.
Finally, the effective segmentation of the debris image and the automatic extraction of debris objects were realized. At the
same time, targetting the characteristics of low proportion of an object in the total image, a novel method of adaptive thresholding
selection was put forward, which is based on the Ostu thresholding method. The segmentation results along with the debris
image prove that the current method can give more precise and accurate segmentation of objects than the classical methods.
The results also showed that methods in the present paper were concise and effective, which provides an important basis for
the further study of debris recognition, fault diagnosis, and condition monitoring of machines.
The text was submitted by the authors in English.
Xianguo Hu (born 1963), PhD, is a professor at the School of Mechanical and Automotive Engineering at the Hefei University of Technology,
China. He received his BS and MS in Powder Metallurgy Material and Mechanics (Tribology) from the Hefei University of Technology
in 1985 and 1988, respectively. His PhD degree was awarded at Szent Istvan University, Hungary, in 2002. As a visiting scientist,
he conducted research at the Technical University of Budapest, Hungary, and the Technical University of Berlin, Germany, from
1994 to 1997. His research areas include wear debris analysis, optimal tribological design, friction and wear mechanisms,
etc. He is the author or coauthor of more than 100 published technical papers.
Peng Huang (born 1981) is an MS student at the School of Mechanical and Automotive Engineering of Hefei University of Technology, China.
His main focus is on wear debris analysis.
Shousen Zheng (born 1963) is an associate professor at the School of Engineering, SunYat-Sen University, China. He received his BS, MS,
and PhD in Mechanical Engineering from Hefei University of Technology in 1985, 1988, and 2001, respectively. From 1988 to
2004, he was employed at the Department of Mechanical Engineering at the Hefei University of Technology. In 2005, he moved
to the current university. His research interests include computer language, auto CAD/CAM, wear debris analysis, etc. He is
the author or coauthor of more than 40 published technical papers. 相似文献