查询词典 rolling friction

Through methane simulation experiment on ignition and blasting due to seam roof rock friction in Qinshui Coal Mining District of Yangcheng, it is shown that sparks will be generated through friction while caving ,causing gas and water mixture to fire, it is big hidden sources which cause methane blasting accident in goaf.

通过对阳城沁水矿区煤层顶板岩石相互摩擦引燃引爆瓦斯模拟实验，得出&岩石在冒落过程中相互撞击摩擦产生火花，可能引起瓦斯与空气混合物着火，是造成采空区瓦斯爆炸事故引爆源&的结论。

Test results show that Taichung Harbor Sand/ concrete block, the interface friction angle and shear strength are difference, related with the size of the grid opening, the grid number of horizontal opening, Soil and the geogrid system has more obvious acts, such as the shear stress to the displacement of shear increases, the interface will increase friction angle.

试验结果得知在上盒台中港砂/下盒混凝土块体，其影响界面摩擦角与剪力强度差异是与格网横向勒条数，开孔大小有关格网横向勒条数越多且网目越小，土壤与格网互制行为越为明显，剪应力将随著剪力位移的增加而增加，界面摩擦角将会提高。

Induced drag occurs when the air flow separates from the surface of a wing, while friction drag is due to the friction between the air and bird moving through the air.

诱导拖动发生时，气流分离，从表面的一翼，而摩擦拖曳是由于摩擦之间的空气和鸟移动通过空气。

The results shoW that,both Si02 and mullite can be as friction additive,the friction coefficient and wear rate of counterpart incr......

在摩擦组元含量相同的情况下，添加莫来石的摩擦材料的摩擦系数、磨损量、对偶件的磨损量均比添加SiO2者要高。

Laser-textured specimens exhibited lower and stable friction coefficient as compared with untextured specimens under dry friction. The textured surfaces also exhibited lower wear rate than that of untextured specimens. It was found that micro-dimples acted as traps for wear debris, and hence decreased abrasive wear.

在相同试验条件下与未织构面对比，织构面的摩擦系数均有不同程度减小且表现得更为稳定，并且磨损率也得到一定的降低，这是由于所制备的表面微坑起到了捕获磨屑的作用。

The contact area ratio of the asperities between the gap decreasing while the rolling speed increasing results in decreasing of the shear stress between the gap and positive damping of friction.

由辊缝动力学分析发现，随着轧制速度的提高，辊缝间粗糙微峰的接触区域比减小，导致辊缝间的剪切应力降低，由此产生的摩擦正阻尼降低。

Wheel/rail friction,rolling contact,temperature,creepage,finite element method

中文关键词：轮轨摩擦；滚动接触；温度；蠕滑率；有限元

The rolling friction coefficient,elastic resilience and ultimate strength of the three kinds of roller s are researched.

对3种材料制作的滚轴的滚动摩擦系数、弹性恢复力和极限强度进行了试验，并对3种滚轴的隔振效果进行了计算机模拟分析。

In the analysis, firstly, the flux boundary condition is used to simulate the frictional heat resource between wheel and rail. The non-steady heat transfer between the contacting surfaces of the wheel/rail, heat-convection and radiation between the wheel/rail and the ambient were all taken into consideration. Therefore, a heat coupling model of the wheel/rail in rolling/sliding is put forward to calculate the frictional temperature rise in the wheel and rail. Secondly, after the temperature distribution of wheel/rail, due to friction, is calculated, substitute the thermal load with equivalent fictitious body force and boundary distributed force loaded on the nodes of the corresponding elements. The wheel-load is applied to the center of the wheel.

首先，用热流边界条件模拟轮轨接触界面的摩擦热源，考虑轮轨间的非稳态热传导、轮轨自由表面与环境的热对流、热辐射的影响，建立轮轨滚动接触热耦合有限元计算模型，分析计算轮轨滚、滑工况下的摩擦温升；其次，以求得的轮轨温度场结果作为求解轮轨应力场的已知条件，轮载以集中力形式直接加载于轮心处，将摩擦温升引起的热载荷等效为假想体力和热边界面力，施加于相应的单元节点上，建立了轮轨热—机械载荷耦合作用的热弹性平面应力模型，分析热—机械载荷作用下的轮轨应力场。

We all know that roller, block between hobber and hobber for the imprint, but the artificial division between rolling roller, block roller and embossing roll is a compact, linear three-roll and is consistent, so when the pressure is too large, due to the printing plate is compressed with the roller between a certain amount of sliding friction, thereby allowing the printing plate abrasive.

不小家都懂得，网纹辊、印版滚与不抬印滚之间虽说是滚不抬，但是网纹辊、印版辊与不抬印辊是有不抬缩的，而不一辊的线速量又是分歧的，所以当不弛力过不小时，由于印版被不抬缩会与网纹辊之间爆发必定的滑动摩擦，从而使印版爆发磨损。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。