共查询到18条相似文献,搜索用时 203 毫秒
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以某产品动力系统陆上功率试验数据、泵阀性能试验数据、湖试和海试的实航数据为基础,开展动力系统可靠性数据分析研究工作,设计了一个大型的数据库查询统计分析系统。该系统具备用户权限管理、试验信息查询、试验数据回放对比分析、故障查询和统计分析等功能,实现了某产品从生产到功率试验再到湖海试数据的快速查询和对比分析,对生产和功率试验的排故具有重要意义。 相似文献
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在对往复泵设计理论及机械CAD技术进行系统的分析和研究的基础上,结合企业多年来往复泵的设计、制造经验,运用VB6.0开发出了高效实用的三柱塞往复泵CAD系统软件。该模块建立了Access数据库,能够把CAD系统软件计算的有用数据保存起来,实现了数据查询、参数化绘图、数据报表创建等功能。 相似文献
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介绍了国产高速航空润滑剂拖动系数数据库的程序界面及功能实现过程。该数据库是基于Access、利用Delphi开发的,能方便地查询数据,分析润滑剂的拖动特性。 相似文献
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利用计算机数据库技术设计“计量管理系统”软件,提高了企业的计量管理水平和工作效率。该软件包括7个功能块。整个系统包括数据库和应用程序两个部分,实现了数据管理、更新、查询、分析、统计、报表度系统维护等功能。 相似文献
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全球润滑脂工业最新展望 总被引:1,自引:0,他引:1
介绍了世界润滑脂工业在产品结构、组成发展、包装应用等方面的现状、发展趋势和最新开发动向;简述了我国润滑脂工业的现状及与世界先进水平的差距,预测了我国润滑脂工业的发展未来。 相似文献
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A continuing desire exists to explore graphene as a lubricant additive and increase the performance of oil/grease products in efforts to acquire a fundamental knowledge of its tribology. As compared to graphite and ionic liquid, multilayer graphene (MLG) as a bentone lubricating grease additive not only provides lower friction and better wear resistance, but also greatly improves the load-bearing capacities and thermal stability of bentone lubricating grease. These benefits are strongly dependent on the formation of a versatile boundary lubricating film, which is provided by the laminated structure and good adsorption action of MLG on the rubbing surfaces, as well as good dispersion of MLG in grease. 相似文献
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M. A. Delgado C. Valencia M. C. Sánchez J. M. Franco C. Gallegos 《Tribology Letters》2006,23(1):47-54
Thermal-induced changes in the viscous and viscoelastic responses of lubricating greases have been investigated through different
rheological techniques in a temperature range of 0–175 °C. Small-amplitude oscillatory shear and viscous flow measurements
were carried out on a model conventional lithium lubricating grease prepared by inducing the in situ saponification reaction
between 12-hydroxystearic acid and hydrated lithium hydroxide. The linear viscoelasticity functions dramatically decrease
above 110 °C, but not below this critical temperature, which determines the maximum recommended operating temperature in relation
to its durability and resistance under working conditions. Two different regions, below and above this critical temperature,
in the plateau modulus versus temperature plot have been detected. From this thermal dependence, a much larger thermal susceptibility
of the lubricating grease at temperatures above 110 °C is apparent. The thermo-mechanical reversibility of this material has
been studied by applying different combined stress–temperature protocols. Regarding the viscous flow, a minimum in the shear
stress versus shear rate plots appeared at temperatures above 60 °C, more pronounced as temperature increases, resulting from
material instabilities. The experimental results obtained have been explained on the basis of the thermo-mechanical degradation
of the lubricating grease microstructure. 相似文献
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M. C. Sánchez J. M. Franco C. Valencia C. Gallegos F. Urquiola R. Urchegui 《Tribology Letters》2011,41(2):463-470
In this work, non-perturbed microstructures of several commercial and model lubricating greases, differing in nature and concentration
of the thickener agent, were examined using the atomic force microscopy (AFM) technique. Grease microstructure mainly depends
on the nature of the thickener employed and, also, on thickener concentration and viscosity of the base oil. Thermal-induced
changes in the viscoelastic response of lubricating greases have been investigated by using different rheological techniques
in a temperature range of 0–175 °C. Small-amplitude oscillatory shear (SAOS) measurements were carried out to determine the
mechanical spectra of the different samples studied. Lubricating grease rheological thermal susceptibility was analysed by
following the evolution of the plateau modulus with temperature. SAOS functions dramatically decrease, in most cases, above
a characteristic temperature, which depends on nature and/or concentration of the thickener used and therefore on grease microstructure.
The thermo-mechanical reversibility of grease microstructure has been studied by carrying out triple-step-shear stress tests
(shear stresses inside and outside of the linear viscoelasticity range), at different temperatures. The degree of lubricating
grease non-reversible structural breakdown, which increases with temperature, depends on the shear stress applied above the
linear viscoelasticity limits. 相似文献
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试验研究镀银膜轴承在干摩擦、润滑油和润滑脂复合润滑下的摩擦性能。试验结果显示:在中低转速下,镀银膜轴承在银膜和液体润滑剂(油和脂)复合润滑下的摩擦因数仅相当于银膜干摩擦下摩擦因数的10%左右,且变化平稳;在高转速下,试验轴承在银膜和液体润滑剂复合润滑下的摩擦因数随转速增加而增加,且银膜与润滑脂复合润滑条件下的摩擦因数随转速增加得更快,但仍小于银膜干摩擦下的摩擦因数;镀银膜轴承在银膜和液体润滑剂(油和脂)的复合润滑下的磨损小于银膜干摩擦时的磨损;中低转速下,镀银膜轴承在液体润滑剂(油和脂)复合润滑下的摩擦磨损性能远优于银膜干摩擦时的摩擦磨损性能。 相似文献