查询词典 on the ball

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。

But Tommy said he wanted the ball and Edy told him no that baby was playing with the ball and if he took it there'd be wigs on the green but Tommy said it was his ball and he wanted his ball and he pranced on the ground, if you please.

但是汤米说他要那只球，而伊迪告诉他说：不行，娃娃在玩球呢；要是他把球拿了去，又该吵架了。然而汤米说，这是他的球，他要自己的球。瞧，他竟然在地上跺起脚来了。

David · the Baker Chinese mho is born: On May 2, 1975 height: 1.80m body weight: 71kg nationality: English Club: On imperial Madrid field position: The middle place joins time: In 2003 has stayed club: Graceful joint honor: 98/99 season Europe champion cup champion, the English ultra champion, the English foot total cup champion, Toyota cup champion Antonio · card Sa Nuo Robert · Carlos is born: On April 14, 1973 height: 1.68m body weight: 69kg nationality: Brazilian Club: On imperial Madrid field position: The fullback joins time: In 1996 has stayed club: Parr Melas, international Milan honor: The World Cup champion (Brazil in 2002) the European champion cup champion west the armor champion introduced: Robert · Carlos was considered is the world best left back, he most famous entered the ball is in the French cup captures French team's that in 1997 to enter the ball, he kicked the ball as soon as about 40 meters with his famous left leg flank which recorded looks like not not impossibly to enter, the ball changes suddenly right flank the French team human wall, and crossed French team goalkeeper Baht this to fly into the goal.

戴维·贝克汉姆出生：1975年5月2日身高：1.80m 体重：71kg 国籍：英格兰俱乐部：皇家马德里场上位置：中场加入的时间：2003年曾经呆过的俱乐部：曼联荣誉：98/99赛季欧洲冠军杯冠军、英超冠军、英格兰足总杯冠军、丰田杯冠军安东尼奥·卡萨诺罗伯特·卡洛斯出生：1973年4月14日身高：1.68m 体重：69kg 国籍：巴西俱乐部：皇家马德里场上位置：后卫加入的时间：1996年曾经呆过的俱乐部：帕尔梅拉斯、国际米兰荣誉：世界杯冠军(巴西2002年)欧洲冠军杯冠军西甲冠军简介：罗伯特·卡洛斯被认为是世界最好的左后卫，他最著名的入球是在1997年法国杯中攻入法国队的那个入球，他在40米开外用他著名的左脚的外侧踢出一记看起来不可能入的球，球在法国队人墙右侧突然转向，并越过法国队守门员巴特兹飞入了球门。

On the Zong say, can see, for the N ball but speech, because ball of successively different, the all leading of the ball of each number ball is different, and, after depending ball of all rate will one by one in order become big.

综上所述，可以看到，对于出N个号球而言，由于出球的先后不同，每个号球的出球的概率是不同的，而且，靠后出球的概率会依次变大。

It was the turn next of the other new arrival, Domoraud, to get in the action when, seizing on a flicked header from Matt Pattison, he strode through on the Woking left to test the Lewes keeper with a left-footed strike. On the quarter hour mark Danny Bunce tried an ambitious effort from 30 yards, the ball passing a foot or so over the bar. A minute later a good move involving Domoraud and Lambu ended in a scramble in the box. The ball reared up but wouldn't come down quickly enough to allow Gez Sole to get the ball on target.

接下来轮到了另一个新加盟的队员，多莫劳德接马特-帕蒂森的头球传球在左路起左脚射门被路易斯队门将化解。15分钟时丹尼-邦斯有一次30米外的劲射，球稍稍高出横梁。1分钟后多莫劳德和朗布在禁区内的配合制造了威胁，但球下坠速度不够，朱塞佩-索勒没能射中目标。

But Tommy said he wanted the ball and Edy told him no that baby was playing with the ball and if he took it there'd be wigs on the green but Tommy said it was his ball and he wanted his ball and he pranced on the ground, if you please.

那是她妈妈的生日，查理在家休假，还有汤姆[ 30 ]、迪格纳穆夫妇、帕齐和弗雷迪·迪格纳穆[31 ]，要是大家合影留念就好了。谁也不曾料到他这么快就会死去。如今他已长眠了。

The paper reports the results of investigation for the operation condition of the ball-mill coal-pulverizing system of 100MW and larger power station. Based on the analysis of the ball-mill mechanism, the problem was found that the energy consumption on empty load of ball mill is more than 90% of the total energy consumption and the small iron balls that has lost mill ability and the iron component in the coal increased the mill s energy consumption. Thus automatic ball filter equipment was developed and in...

中文摘要：本文对我国100MW及以上火力发电厂磨煤机制粉系统现状进行总结、研究，指出存在的问题；分析了钢球磨煤机的工作机理，发现钢球磨煤机空载耗能约占90%以上，没有研磨效力的小钢球和煤炭中的铁件杂物加大了磨煤机耗能；研究开发了钢球磨煤机自动选球装置，并对50MW、100MW、200MW及300MW机组使用的钢球磨煤机进行改造，安装了该装置，通过改造前后的试验，证明该装置取得了明显的节能效果；在此基础上，对该装置提出了完善和改进措施。

Ball-point pen ink through the ball seat in the grooves of the five beads on the flow of the ball, pen in writing, the friction drive beads rotate, which will continue to flow to the ball beads of ink on the transfer to the written material.

圆珠笔通过在对球的，书面笔流珠五个座位的凹槽球墨水笔，摩擦驱动旋转珠子，将继续向有关移交给墨球珠的书面材料。

What the paper studying is a part of the project of reformation of ball screw grinding machine tool of Hanjiang Machine Tools Factory. This paper introduces a on line working status monitoring and assistant failure diagnose system of ball screw grinding machine using ball screw lead error data which be acquired just after the ball screw is grinded on the machine.

本文所研究的内容是汉江机床厂滚珠丝杠磨床改造项目的一部分，介绍了一种利用在线测量获得的滚珠丝杠导程误差对丝杠磨床进行在线工况监测和诊断的方法。

Use of this tactic in the opponent's first attack, there is no fully effective, and the ball when the ball is not dead, the other side of the ball off you, this time on the effectiveness of this tactic, and then you need to do is have the potential of the fast ball to your teammates are back on the OK!!

运用这个战术是在对手的一次进攻，并没有完全奏效，并且球没有死球的时候，对方的球被你断了，这个时候这个战术就奏效了，这时你需要做的就是又快有准的把球传给你正在进行反击的队友就OK了！！

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。