能变地

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。

No He won't have it , he knows his whole back city's ropes It don't matter, he's dope He knows that, but he's broke He's so stacked that he knows When he goes back to his mobile home, that's when it's Back to the lab again yo This whole rap shit He better go capture this moment and hope it don't pass him You better lose yourself in the music, the moment You own it, you better never let it go You only get one shot, do not miss your chance to blow This opportunity comes once in a lifetime yo The soul's escaping, through this hole that it's gaping This world is mine for the taking Make me king, as we move toward a, new world order A normal life is borin, but superstardom's close to post mortar It only grows harder, only grows hotter He blows us all over these hoes is all on him Coast to coast shows, he's know as the globetrotter Lonely roads, God only knows He's grown farther from home, he's no father He goes home and barely knows his own daughter But hold your nose cuz here goes the cold water His bosses don't want him no mo, he's cold product They moved on to the next schmoe who flows He nose dove and sold nada So the soap opera is told and unfolds I suppose it's old potna, but the beat goes on Da da dum da dum da da You better lose yourself in the music, the moment You own it, you better never let it go You only get one shot, do not miss your chance to blow This opportunity comes once in a lifetime yo No more games, I'ma change what you call rage Tear this mothafuckin roof off like 2 dogs caged I was playin in the beginnin, the mood all changed I been chewed up and spit out and booed off stage But I kept rhymin and stepwritin the next cypher Best believe somebody's payin the pied piper All the pain inside amplified by the fact That I can't get by with my 9 to 5 And I can't provide the right type of life for my family Cuz man, these goddam food stamps don't buy diapers And it's no movie, there's no Mekhi Phifer, this is my life And these times are so hard and it's getting even harder Tryin to feed and water my seed, plus See dishonor caught up bein a father and a prima donna Baby mama drama's screamin on and Too much for me to wanna Stay in one spot, another jam or not Has gotten me to the point, I'm like a snail I've got to formulate a plot fore I end up in jail or shot Success is my only mothafuckin option, failure's not Mom, I love you, but this trail has got to go I cannot grow old in Salem's lot So here I go is my shot.

无 他不会有，他知道他的整个回城的绳索它不处理此事，但他的涂料他知道，但他的突破他的，所以堆叠他知道当他回到他的手机在家，就什么时候，它的回到实验室又摇摇这整个说唱为Shit 他最好去捕捉这一刻，并希望它不通过他您更好地失去了自己在音乐，时刻你拥有它，你最好永远不会放手你只能获得一杆，千万不要错过你的机会，以打击这个机遇而来的一生中只有一次的心灵灵魂的逃亡，透过这个洞，它的溃烂这个世界是矿井为录取令我国王，因为我们走向一个新的世界秩序过正常的生活，是borin ，但superstardom的接近邮政砂浆它不仅日益困难，只有长大白热化他的打击我们所有这些锄头，是所有对他的海岸到海岸的表演，他知道作为globetrotter 寂寞的道路，只有上帝知道他的成长到离家远，他的父亲并没有他回家，勉强知道自己的女儿但对于你的鼻子cuz这里有云冷水他的老板不希望他没有谟，他的冷战产物他们转移到下一schmoe谁流向他的鼻子鸽派和出售纳达所以肥皂歌剧是告诉，并逐步落实我想它的旧potna ，但在街上巡逻下去大达达姆弹达达姆弹达大您更好地失去了自己在音乐，时刻你拥有它，你最好永远不会放手你只能获得一杆，千万不要错过你的机会，以打击这个机遇而来的一生中只有一次的心灵没有更多游戏，我是改变你们称之为愤怒催泪这mothafuckin屋顶起飞一样二日犬笼我是playin在beginnin ，心情，一切都变了我是咀嚼起来，吐出一片嘘声起飞阶段但我一直rhymin和stepwritin未来的CYPHER 最好相信有人的payin该pied伯尔所有的痛苦内扩增事实我不能得到我的9至5月我不能提供适当类型的生命，因为我的家庭 cuz男子，这些goddam粮票不买尿布它的不看电影，有没有mekhi phifer ，这是我的生命这些时代，所以很难和它变得更难 tryin到饲料和水我的种子，加上见荣辱赶上了bein父亲和表面唐娜宝宝妈妈戏剧的尖叫和太多，我想留在现场的一个，另一个果酱或不得到了我的一点，我想蜗牛我必须制订一项阴谋前列我结束了在监狱或打针成功是我唯一的mothafuckin选择，失败的不是妈妈，我爱你，但这个线索已经去我不能老在塞勒姆的地段所以在这里，我去的是我的了一枪。

Carroll's fairy tale "Ailisi Roams Wonder world To record", narrated girl Ailisi follows one to put on formal clothes' pinkeye rabbit roaming fairyland story, has run into many strange people and the matter, is first falls down from a rabbit hole, drinks can make one changes the small liquid medicines, also ate has been able to cause the human becomes the very big biscuit, did not stop changes between the giant and the pocket-sized person changes, about the stature size, was Ailisi continuously the very puzzled matter, was also she meets frequently in the fairyland, behind also had rabbit gentleman in family's liquid medicines and the small dessert,Right side the larva aculeata colonel's left side increased changes the small mushroom, Lisi said that she did not know who she was, one kind of height could not maintain 10 minutes, therefore who her indefinite oneself were.

卡罗尔的童话《爱丽丝漫游奇境记》，讲述了一个小姑娘爱丽丝跟随一只穿礼服的红眼兔子漫游仙境的故事，遇到了许多奇奇怪怪的人和事，先是从一个兔子洞里掉下去，喝能使人变小的药水，又吃了能使人变得很大的饼干，不停地在巨人和袖珍人之间变来变去，关于身材的大小，是爱丽丝一直很困惑的事情，也是她在仙境中经常遇到的，后边还有兔子先生家里的药水和小点心，毛虫上校的左边变大右边变小的蘑菇，艾丽丝说，她不知道自己是谁，一种身高不能保持10分钟，所以她不确定自己是谁。

So, the average density of spatial energy of spatial radius is the length of Planck of relative time-space cosmic energy follow the rise and fall of quantum spatial measurement, at original cosmic time-space set out, from the structure-energy of mass 16.38×10-71 N · m to the space-energy of 8.19×10-71 N · m and the mass-energy of 8.19×10-71 N · m, come to do not exceed the structure-energy of mass 32.76×10-71 N · m to the space-energy of 8.19×10-71 N · m and the mass-energy of 24.57×10-71 N · m, not smaller the structure-energy of mass 21.84×10-71 N · m to the space-energy of 8.19×10-71 N · m and the mass-energy of 13.65×10-71 N · m, come to do not symmetrically gradually belong to stabilization thus at reductively fluctuate, not can reversely strides across reach the stable state of structure-energy mass 24.57×10-71 N · m to the space-energy of 8.19×10-71 N · m and the mass-energy of 16.38×10-71 N · m maintain unchanging.

所以，宇宙能量的相对时空空间的半径为普朗克长度的空间的能量平均密度随宇称量子的涨与落，在原初的宇宙时空启动，从16.38×10-71N · m 质量结构能对于8.19×10-71N · m 空间能与8.19×10-71N · m 质能，成不大于32.76×10-71N · m 质量结构能对于8.19×10-71N · m 空间能与24.57×10-71N · m 质能，不小于21.84×10-71N · m 质量结构能对于8.19×10-71N · m 空间能与13.65×10-71N · m 质能，成不对称地递归于稳定而在缩小地波动，不可逆地跨越到24.57×10-71N · m 质量结构能对于8.19×10-71N · m 空间能与16.38×10-71N · m 质能的稳定状态保持不变。

Using droplets of liquid crystals--the same substance in laptop displays--the scientists can make a pane of glass that quickly switches from transparent to diffracting and back again.

用液晶微滴----液晶显示屏中的相同物质----科学家们能够造出一种玻璃片，它能快速地从透明态转换成衍射态，再变回透明态。

Three kinds of arm's robust control theorys are designed: the torque control based on FNN controller, the computed torque control with sliding mode compensation and the computed torque control with WNN compensation. FNN syncretizes the reasoning ability of fuzzy control and parameters' self-learning ability of neural networks. It does not depend on the precision of the mathematical model, and can overcome the impact of the uncertainty effectively. So FNN is regarded as the manipulator controller and used to the trajectory tracking of arm control. The computed torque control with sliding mode compensation is designed.

在此基础上，研究了机械手臂的鲁棒控制法，分别设计了基于模糊神经网络的机械手臂力矩控制方法、基于滑模变结构控制补偿的机械手臂力矩控制方法以及基于小波神经网络补偿的机械手臂力矩控制方法，具体内容如下：模糊神经网络融合了模糊控制的推理能力和神经网络的参数自学习能力，它不依赖于对象精确的数学模型，能有效地克服被控对象存在的不确定部分的影响，本文把模糊神经网络作为机械手臂的关节伺服控制器，通过对网络参数的学习训练来调整机械手臂关节的控制力矩，实现对机械手臂的轨迹跟踪控制。

Allosteric control enables the cell to regulate needed substances rapidly.

变构调控使细胞能迅速地调节所需物质的合成。

The results showed that DCA and CA treatments significantly inhibited fruit rot and flesh browning,kept firmness,alleviated the harm to flesh tissue and chilling-sensitivity,improved quality after storage in comparison with Control.

结果表明，与对照相比，DCA和CA贮藏均能有效地减少果实的腐烂和褐变，保持果实硬度，减轻果肉组织伤害，降低果实冷敏感性，提高贮后品质；与CA贮藏相比，DCA处理效果更好。

But today, three minutes, we cried, we cried the whole land of mountains and rivers touching it, over the entire Chinese nation and uniting the strength of the grief and indignation, we no longer need to suppress the sentiments in mind, no longer need to control in the past few days in Yanquan Dazhuan tears, street car on a collective whistle, sounding the alarm over the city, a city of Wu Yan, it is also crying, cry on Kuba, we have too many needs to suppress the release, cry on Kuba, We have too many depressing need venting, 3 minutes, we do not want to do what, we just cry, as we are brothers and sisters toward heaven, for those who are strong to survive the hand-foot-compatriots.

破碎的心，往往会变得相当脆弱，灾后重建，坚强就变得尤其重要，三分钟过后，我们要擦干眼泪，我们不能再哭，要勇敢地活下去，因为亲人会在天堂看着我们，痛不欲生、伤心欲诀不是他们想看到的，好地地活下去，是他们对我们的期望，想一想，那废墟中以已命换子命的母亲，&亲爱的宝贝，如果你能活下去，要记住，妈妈爱你&；想一想那为了救四个孩子而牺牲了的老师，我们的走了的这些亲人，用自己的生命给我们争来了活的机会，为了他们，我们也要活的更好。

As a result this method can enhance the VAV air conditioning system's dynamic performance, and its validity has been verified by the simulations.

所提出的控制方法能有效地提高了变风量空调系统的动态性能，并由仿真结果验证了其有效性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。