摩擦

Focused on many problems existing in pressure control system of drilling pipe friction welding,such as high failure rate and poor amenability,the basic principles of friction welding and electro-hydraulic proportional technique were briefly described.

针对焊接钻杆连续驱动摩擦焊机采用开关阀组成压力控制系统存在故障几率高、可控性差等问题，将电液比例控制技术应用在摩擦焊压力控制中，实现了摩擦焊轴向压力闭环控制、滑台进给速度的开环控制；可对摩擦焊机主轴速度、轴向压力、轴向缩短量、主电机电流、油温等进行实时检测。

The friction characteristics of polyurethane for the friction liner of hoisting were studied. It was found that the dynamic friction coefficient of polyurethane increases with sliding velocity in the range of 0.01 to 0.4 mm/s and decreases beyond 0.4 mm/s.

本文研究了聚氨酯弹性体摩擦衬垫材料的摩擦特性，发现聚氨酯弹性体材料的动摩擦系数是和滑动速度有关的，在0.01～0.4mm/s的速度范围内，速度提高摩擦系数上升，在更高的速度下摩擦系数还会下降。

The value of the stable friction coefficient is equal to the average value of the friction coefficient of matrix and reinforcement.

在摩擦试验的最初阶段，复合材料的摩擦系数随摩擦的进行而降低，并在一定的摩擦距离以后趋于稳定。

Though it is a long history of the research on static friction, many problems, such as relationship between static friction and static contact time, the relationship between static friction and load, and the prediction of static friction coefficient have not yet fully studied.

虽然静摩擦的研究历史很悠久，但仍有一些问题没有解决，如静摩擦与静止接触时间的关系，静摩擦与载荷的关系，以及静摩擦系数的预测等问题。

With increasing temperature of separate plate,shapes of friction torque became dissymmetrical,and dynamic and static coefficient of friction declined in this process.

以自制炭纤维增强纸基摩擦材料和45#钢为摩擦副，采用惯量试验方法研究了温度对摩擦副摩擦性能的影响。

The results show that influence of content of kraft fiber on compressure-resilience and tribology properties was inapparent, however the compressure rate and resilient rate were increased when pressure was increased, and friction coefficient was decreased to some extent when pressure and rotate speed were increased.

在相同比压和转速条件下，纸浆纤维含量对纸基摩擦材料动摩擦系数的影响不明显，但随着比压和转速的增加，纸基摩擦材料的摩擦系数降低，其中含有17.5%纸浆纤维的纸基材料在循环制动条件下的摩擦系数最稳定，磨损率最低。

Friction and wear behavior of CrNiMo steel against H96 brass in different atmosphere s like oxygen and carbon dioxide were investigated on the MMS-1G tribometer under high speed and dry sliding.

采用MMS-1G型高温高速摩擦磨损试验机研究了在氧气和二氧化碳2种气氛环境中CrNiMo钢/H96黄铜摩擦副的高速干滑动摩擦磨损特性，采用扫描电子显微镜和X射线光电子能谱仪对CrNiMo钢销试样的磨损表面形貌及其元素的化学状态进行分析，结合摩擦表面宏观温度的测量，分析了不同气氛环境中pv值对摩擦副摩擦磨损特性的影响。

The effect of temperature on the friction and wear performances of multi-fibers reinforced automotive brake is investigated using XD-MSM tester. The mechanism of friction and wear is analyzed by observing the surfaces of friction material worn at different temperatures by means of scanning electron microscope.

利用XD-MSM型定速摩擦试验机，考察了摩擦材料的摩擦系数和磨损率随温度变化的情况，并且通过扫描电镜观察了摩擦材料在不同温度下磨损后的表面形貌，分析其摩擦磨损机理。

The morphological analysis and chemical characterization of the worn surfaces via scanning electron microscopy, laser scanning microscope, and X-ray photoelectron spectroscopy reveal that under titrimetric water lubrication, the hBN in Si3N4-hBN spalled off during the wearing tests and the spalled pits formed on the wearing surface of Si3N4-hBN, and then the debris dropped into the pits to react with water, thus a tribochemical film formed on the wearing surface. The formation of the tribochemical film facilitated smoothing the surfaces of Si3N4-hBN and Si3N4 to create a fine lubrication environment.

在滴定法水润滑条件下，磨屑不易被水带走，当Si3N4-hBN与Si3N4配副摩擦时，由于Si3N4-hBN摩擦面上hBN偏聚区域发生脆性断裂和剥落而形成剥落坑，磨屑在剥落坑中堆积并氧化、水解，反应产物富集于剥落坑中，进而在摩擦表面形成含B2O3和SiO2的摩擦化学反应膜，从而保护了Si3N4-hBN和Si3N4摩擦面，使其变得光滑，为发生流体润滑提供了条件。

First, a test system of tire tread rubber friction was established.

首先，建立了轮胎橡胶动摩擦试验系统，设计了动摩擦试验方法，通过对轮胎橡胶块的摩擦试验获得了轮胎橡胶在不同速度、温度、路面、压力等因素下的摩擦特性数据，并通过拟合得到了相应摩擦特性参数。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。