查询词典 lubrication

The effect of tribology factors on bearing vibration is studied experimentally. AR model and WPT are used to processing the normal arid abnormal signals. The results are as follows:1. The vibration of ball bearings is caused by the tribology action of contact pairs of ball and ring races and has the essential of tribo-dynamics. Any factors affecting the tribology characteristics of contact pairs will affect vibration and noise of bearings consequently.2. Vibration characteristics of bearing keep almostly unchanged with the increasing of axial load expecting the increasing of nature frequencies. When radial load increasing with axial load unchanged, nature frequencies keep unchanged but some new vibration peaks appears in the spectrum.3. Vibration amplitudes are damped and nature frequency are enhanced with sufficient lubrication. Vibration and noise of bearings increase obviously and roar can happen and the contact surfaces scratch slightly under insufficient and unclean lubrication state. Bearing will be disabled in a few minutes without any lubrication.4. Bearing vibration is unstable under low speed. With the speed increasing, the vibration become stable and natural frequencies increase slightly but the amplitudes increase apparently.5. Bearing vibration can be excited only by some harmonics ofwaviness without lubrication and by all harmonics with lubrication based on the theoretical analysis.6. The nature frequencies of ball bearings decrease with the increasing sizes. When international clearance increasing, nature frequencies decrease in radial and increase in axial and angular and the amplitudes increase in radial and decrease in axial and angular. When the number of balls increasing, nature frequencies increase and amplitudes decrease. When the pitch diameter increasing, axial nature frequency increase and others nearly keep no change. When outer race groove curvature radius increasing, nature frequencies increase in radial and decrease in axial and angular and amplitudes keep no change in radial and increase in axial and angular. When inner race groove curvature radius increasing, nature frequencies decrease and amplitudes increase.7. The distortion in amplitude and frequency components of bearing vibration signals picked up by the present probe measurement method is founded and right conclusions cannot be achieved by the signals. When accelerometer is rigidly screwed with steel stud onto a flat outer surface of a ball bearing, vibration signal can be got without distortion and the reliability of research on bearing vibration is assured.8. AR model is suitable for large samples of bearing vibration signals, square root of length of samples can be used as the upper limitation of order determination and the FPE order selection criterion is effective. Many advantages of AR spectrum are founded over the classical based on FFT.9. Time-Frequency analysis is necessary for abnormal noise of ball bearings. WPT overcomes the principle shortcomings of STFT and proved to be a best tool to process the abnormal signals.

理论分析和试验研究表明： 1球轴承振动是钢球—滚道接触副中的各种摩擦学作用引起的，具有摩擦动力学的本质，任何对接触副的摩擦学特性有影响的因素都将对球轴承的振动和噪声特性产生影响； 2中心轴向载荷作用下，载荷增大使球轴承的固有振动频率升高，载荷越大同样的载荷增幅引起的频率升幅减小，足够大的中心轴向载荷作用下载荷的变化对球轴承振动的频率特性不会产生明显的影响； 3轴向和径向联合载荷作用下，径向载荷不大时球轴承振动的固有频率基本不变，但是可能引起变刚度激励的非线性振动，出现新的频峰，过大的径向载荷将使部分钢球脱离接触，使球轴承的振动和噪声呈现不稳定状态； 4润滑对球轴承的振动和噪声特性有重要的影响，良好的润滑对振动有明显的抑制作用，润滑不充分时，振动和噪声的水平会有明显增高，一定条件下还会激发接触副中的谐振，发出啸声，造成接触表面的伤害，无润滑干接触时，短时的运转就会损伤接触副表面，使振动和噪声迅速增大，并随时可能引发严重的磨损和卡滞失效；接触副润滑良好时，油膜的"刚化效应"使球轴承振动的固有频率有所提高，润滑剂中含有弥散性污浊时，振动的幅度总体升高，但弥散性污浊不会改变球轴承振动的频率特性；浙江大学博士学位论文：球轴承振动的研究 5低速时，球轴承振动的基本特征呈现不稳定状态，随着转速的提高，球轴承振动的频率特性趋于稳定，固有频率频峰升高； 6理论分析表明，干接触时钢球和滚道表面波纹度的某些谐波分量能激励球轴承的振动，振动的幅值与谐波幅值成正比，实际球轴承中钢球的分布不可能完全均匀，波纹度的激励作用会随时发生；润滑接触的分析表明，波纹度的任意谐波分量均能激励球轴承的振动； 7球轴承的几何和结构参数分析表明，球轴承尺寸越大，径向、轴向和角振动的固有频率越低；钢球中心圆直径增大，球轴承的径向和轴向振动的固有频率基本不变，角振动的固有频率有所上升，振动的幅频特性基本不变；径向游隙加大使球轴承的径向振动固有频率降低，轴向和角振动的固有频率有所升高，径向振动幅频特性的幅值升高，而轴向和角向降低；钢球的数量增多使球轴承振动的固有频率上升，幅频特性的幅值下降，径向振动的幅值下降最为明显；外圈沟曲率半径系数增大使球轴承径向振动的固有频率升高，轴向和角振动的固有频率降低，径向幅频特性基本不变，轴向和角向幅频特性幅值升高；内圈沟曲率半径系数增大使径向、轴向和角振动固有频率均下降，振动幅频特性的幅值均有升高； 8试验对比表明，传感器采用探针式安装时，由于探针接触副接触特性的影响，钡(量得到的球轴承振动信号有失真，采用专门设计和制作的试验球轴承，以固定式安装加速度计，首次测量得到了球轴承振动的真实信号，通过对振动信号的分析，验证了球轴承振动的理论模型； 9)基于时间序列分析的AR模型适用于大样本球轴承振动信号的分析，以样本长度的均方根值作定阶上界，FPE做判阶准则，给出的AR谱光滑，频率分辨率高，是球轴承振动分析的简便而可靠的手段； 10以时频域分析的小波包变换分析球轴承异音信号能够比较好地定位和聚焦异音发生的时间，时间间隔，频率范围，同样是球轴承振动分析的可靠的手段，可用作球轴承故障诊断技术。

Lubrication system is the combination of forced lubrication and splash lubrication.

润滑系统是强制润滑与飞溅润滑组合。

Whether it or not to improve the lubrication and dynamic performance of gear, at the same time to realize a "green lubrication" type of gear transmission of low cost, energy saving and easy maintenance by means of making use of the frication material"s lubrication performance and meshed medium"s elastic deformation?

能不能研究一种利用摩擦副材料的摩擦润滑特性和啮合介质的弹性变形，实现既能改善齿轮的润滑和动态特性的效果，又能实现低成本、节能、易维护的绿色润滑齿轮传动？

Company main product: 40MPa and following pressure rank drying oil lubrication system and forms a complete set with each kind of specification lubrication pump, divides the adapter, the gasoline-feed pump; XYZ, XHZ standard thin oil lubrication system and each kind of non-sign thin oil lubrication system and hydraulic system; Oil gas, emulsion lubrication system design, manufacture; Pipeline bridge piece, row pipe cooler, filter and so on, more than 50 varieties, more than 1000 specifications.

公司主要产品：40MPa及以下压力等级干油润滑系统及配套用各种规格润滑泵、分配器、加油泵；XYZ、XHZ标准稀油润滑系统及各种非标稀油润滑系统和液压系统；油气、乳化液润滑系统设计、制造；列管式冷却器、过滤器、管路连接件等50多个品种1000多个规格。

The paper summrized lubrication technology and the selection of lubricant for rotary kiln, grate cooler, mill, conveyor mechanical equipment and large scale fan as following,(1)in rotary kiln, apply oil spoon of circulatory lubrication or pump forced oil supply system in the roller supporting mechanism and use (superscript #)680 high load industrial gear oil, and use lubrication method of idle oil wheel or spray in drive gear wheel and select solid lubricant which has high viscosity, strong adsorbability, good abrasion resistance in utmost pressure and lattic crystal structure,(2) in grate cooler, use immersion oil lubrcation in reducer and boiled oil centralized lubrication method in supporting roller and guide roller bearing, choose (superscript #)1 limit pressure lithium lubrcant grease,(3) in mill, use circulatory lubrication with fluxing oil station in drive mechanism and circulatory lubrication with high-low pressure fluxing oil station in main bearing and sliding shoe bearing and select N320 industrial gear oil.

文章全面总结了回转窑、篦冷机、磨机、输送机械及大型风机的润滑技术和润滑剂的选择。其中，(1)回转窑的托轮支承装置一般采用油勺供油的连续循环润滑方式或油泵强制供油系统，润滑油选用680重负荷工业齿轮油；传动大小齿轮的润滑一般采用带油轮或喷雾的润滑方式，润滑剂宜选用粘度高、吸附性强、极压耐磨性好、具有点阵晶体结构的固体润滑剂；(2)篦冷机中传动减速机的润滑一般采用浸油飞溅润滑；托轮，挡轮轴承的润滑一般采用干油集中润滑的方式，润滑脂一般选用锥入度310~340的1极压锂基润滑脂；(3)磨机中传动装置一般采用稀油润滑站循环润滑和冷却的方式；主轴承或滑履轴承的润滑一般采用高低压稀油润滑站循环润滑和冷却的方式，润滑油一般选用N320工业齿轮油。

The paper introduces hot strip rolling lubrication mechanism,analyzes r easons which effect hot rolling lubrication,and put forward to opinions to furth er improve the effect of hot rolling lubrication.

介绍了板带热轧润滑的机理，分析了影响热轧润滑使用效果的因素，同时提出进一步改善热轧润滑效果应重视的问题。

Centralized lubrication methods used lubrication, improved lubrication to a large extent, the cooling effect of raising eight roller guide wire machine guide wire capacity to better tow the line into a certain width and tension wire tablets.

采用集中润滑方式润滑，很大程度上提高了润滑、散热的效果，提高了八辊导丝机的导丝能力，丝束能够更好的行成一定宽度和张力的丝片。

To this end, this paper new Horizontal Two-cylinder diesel engine cooling system and lubrication system design requirements. reference to the existing diesel engine cooling system and lubrication system structure, Diesel right T2100 cooling and lubrication system for the design and analysis.

为此，本文针对新型双缸卧式柴油机冷却系统和润滑系统的设计要求，参考现有柴油机冷却系统和润滑系统结构，对T2100柴油机冷却及润滑系统进行了设计计算与分析。

Initially, assuming that the contact between cam and tappet is"dry contart", a dynamics model of Hertzin contact stiffness and impact damping is established. Next, with dynamic load on cam—tappet pair from the model, an analysis is made both to unsteady EHD oil film in cam—tappet pair under condition of full and partial lubrtication and to wear characteristics of cam profile. then, according to the fact that the lubrication in cam—tappet contact surface is EHD lubrication, taking the interaction between stiffness and damping of unsteady EHD oil film and rigidity of solid object contact into account, a dynamics equation of valve train relating to the dynamic effect of EHD oil film is built up and solved. Consequently, a further study is made on the dynamic characteristics of valve train under interaction of EHD oil film dynamic behavior and the problem of EHD lubrication in cam—tappet pair. Finally, the dynamic effect of full and partial EHD oil film is studied accordingly.

首先，通过对凸轮—挺杆接触为&干接触&的假设，建立了考虑赫兹&接触刚度&和冲击&阻尼&的配气机构动力学模型，用由此求得的凸轮—挺杆表面动载荷对凸轮—挺杆进行了全膜状态和部分膜状态非稳态弹流润滑分析，并研究了凸轮轮廓的磨损规律；然后，是在凸轮挺杆表面存在弹流动压油膜这一事实的基础上，相当于在动力学方程中考虑非稳态弹流油膜的&刚度&、&阻尼&和固体接触&刚度&的耦合作用，建立并求解了考虑弹流润滑行为动力学效应的配气机构的动力学方程，从而深入地研究了弹流润滑行为与动力学行为耦合作用下的配气机构动力学特征以及凸轮挺杆弹流润滑问题；作为前面工作的对应部分，考虑弹流油膜动力学效应的研究工作也同样分为全膜状态和部分膜状态进行。

A model of coupling piston dynamic behavior to Cylinder-Piston-System lubrication is presented and its numerical simulation is performed in two conditions of fluid lubrication and mixed lubrication of rough surfaces through OCAM.

2建立了缸套-活塞润滑与活塞动力学行为的耦合分析模型，用顺序耦合法进行了完全流体动力润滑和考虑微凸体接触两种情况下的耦合数值仿真分析。

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。