滚

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。

AThis machine adopt chain provide and double roller cycle roll , take carton piece though many working procedure of disport,roll line,cut horn,hit especial hole etc. it' ideal equipment of effect all processing carton piece working procedure one time.

本机采用链条送入、双辊轮转滚压的方式，将印刷好的箱片进行分纸、滚线、切角、打异型孔等多道工序，一次完成箱片的全部加工工序的理想设备。

Yet some of the songs are among their very best, especially "Gimme Shelter," with its shimmering guitar lines and apocalyptic lyrics; the harmonica-driven "Midnight Rambler"; the druggy party ambience of the title track; and the stunning "You Can't Always Get What You Want," which was the Stones'"Hey Jude" of sorts, with its epic structure, horns, philosophical lyrics, and swelling choral vocals.

在Brian Jones意外过世的时候，滚石已经邀请到前John Mayall''s Bluesbreakers乐队的Mick Taylor作为乐队的新吉他手。在乐队69年发行的专辑《Let It Bleed》中，由于部分歌曲Brian Jones生前已经参与录制完成，因此Mick Taylor在这张专辑中仅参与了个别歌曲的录音。尽管乐队人员发生了大的变动，但这张《Let It Bleed》仍是滚石最为出色的专辑之一。

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。

FM improvements are that the Flanker now has a faster roll rate and the SFM was tweaked in roll rate for high IAS and high angle of attack.

FM的改进是，侧卫现在的滚转率更快，并微调了标准飞行模形使滚转率达到高IAS和高攻角

Considering the problems of spurgear precise plastic forming, such as high deformation resistance, poor flowability and especial hardness to fill cant of gear, technological plan was developed based on precise plastic forming technique, successive control principle and consecutive local deformation theory. Moreover, structures of the rolling preform die and the die with up and down wellrounded forcer for stamping-extrusion and bulge-extrusion combining forming were designed too.

因此本文的主要研究内容和结果如下：本文以某种直齿轮：模数m＝2，齿数z＝20，压力角α＝200，变位系数x＝0为对象，针对直齿轮精密塑性成形变形抗力大，流动性差，特别是成形中齿轮角隅部分更加难以充满问题，基于精密塑性成形技术、逐次控制原理以及连续局部变形原理提出了"直齿轮滚轧制坯－镦挤、胀挤复合精成形"的工艺方案，设计了滚轧制坯的模具结构和上下冲头带圆角的镦挤、胀挤复合精成形的模具结构。

Precise Sizing "Stirring" action of the rotary bed moves target-size product into sizing pockets Successful option to vibratory graders Up to 95% removal of defects Consistent sizing and absolute control Customer selects target size parameters Easy Adjustment Simple on-the-fly adjustment for rapid fine-tuning Remove safety guard and bolts to exchange five pocket rollers for rollers targeting a different length Low Maintenance, Operation, and Installation Costs Compact: efficient use of plant space Transmits little vibration: simple, inexpensive installation Low energy consumption Easy access and simple maintenance Common Product Applications French fry strips Green beans—cut, whole Julienne vegetables Onion and bell pepper strips

精确尺寸分级转动式机床的"搅拌"操作将目标尺寸产品传送到分选套口振动式分级机的成功选择去除高达 95%的缺陷品分选整齐划一，并可以进行全面控制客户选择目标尺寸参数易于调节简单的快速调节功能，可实现快速微调取下安全防护罩和螺栓，将五个套口滚轴换成针对不同长度的滚轴。维护、运行、安装成本都低外形小巧：高效利用工厂空间传输过程几乎没有振动：简单、经济的安装低功耗易于接触和简单维护常规产品应用薯条绿豆–切割、整颗细条状蔬菜洋葱和钟式辣椒条

This paper has established the mathematical model of its optimal design for studying wet-field roller boat's gear transmission case.

为减轻机滚船质量、节约材料、降低生产成本，以机滚船齿轮传动箱为研究对象，建立了其优化设计的数学模型，在保证给定中心距和传递功率的条件下，合理选择齿轮传动参数，使传动箱的用料最少。

The study result of stress distributing with heavier deflected load on roller has important reference to the generatrix shape-trimming.

还指出，关于较大偏载状况的滚子接触应力分布规律的研究，对滚子母线进行合理修形具有参考价值。

Till now, it's hard to find an efficient and speedy way to get a good raceway figure geometric precision on raceway while machining.

滚珠螺母滚道的加工难度随着它的螺旋角的增大而增加，至今还没有可以达到较好的滚道形状几何精度的高速高效的加工方法。

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。