使干

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。

The production of hard cheese was made possible by the discovery of rennet.

由于rennet的发现使干奶酪的生产成为可能。

The result shown:the growth and development of P-deficient white lupine with cotyledons were not inhibited compared with the P-sufficient white lupine.

结果表明，子叶中的磷能使白羽扇豆在完全缺磷23 d的环境中，不仅没有使干物质的积累减少，反而使干物质的积累略有增加。

MACADAMIA NUT OIL REFINED restores dry, dehydrated, and mature skin.

澳大利亚坚果油能够使干性，脱水和老化的皮肤得到修复。

The germination ratio of Aralia elata seeds dry-stored under ordinary condition can be over 50% when they were treated with different pregermination and soaking methods.

本实验采用不同的催芽方法及不同的浸种时间，使干藏1年的龙牙楤木种子发芽率仍可在50％以上。

Baby girl You know my situation And sometimes I know you get impatient But you dont put to on a show to get ovations Take it to court and go through litagations And I respect ya gangsta Treat you like a princess And put something on your neck to thank ya Shes my pinch hitta When the startin lineup aint playin right I come off the bench wit her It might sound like im gassin ya But it took time to get from the back seat to the passenger We been creepin and sneakin Just to keep it from leakin We so deep in our freakin That we dont sleep on the weekend Wifey A little bit uptight Wonderin why he comin home in the middle of the night Itll be alright if yall bump heads itll be a fight But i said itll be alright Come on I really wanna be with you be with you But I gotta be real with you real with you I cant leave you alone lone And I know I live and grown But i cant let ya go Your the one i want in my life want in my life Already got a wife got a wife Cant leave you alone lone And I know I live and grown But I cant let ya go You aint ever step out of line Or get out a pocket So i made sure canary sent out your locket To protect you, ill get out and cock it And you know the barrel of my gun is big enough to spit out a rocket Oh, you gonna play dumb if cops do come through I gotta keep the top up if my drop do come through But i know the boutiques and the shops you run through So i cop her one, and cop you one too You always get a daily page, weekly ring Plus you aint too shy to do them freaky things I aint gotta put a band on your finger I worry about you tellin the whole world im your new allen springer At first you were somethin i denied Something I would slide Just do somethin in the ride But shorty Theres something that you provide Cause the entre pain is good without somethin on the side You know I really wanna be with you be with you But I gotta be real with you real with you I cant leave you alone lone And I know I live and grown But i cant let ya go Your the one i want in my life want in my life Already got a wife got a wife Cant leave you alone lone And I know I live and grown But I cant let ya go Uh oh, i might be leavin the earth soon My girl gonna kill me if she smells the scent of your perfume Its gonna be a clip towards if I go back With stains of your lip gloss on my throwback She wont care if im a platinum rapper If she catch me with an empty magnum wrapper So keep it on the down low call the carsely You seen what happened with Mr. Big and R Kelly You know I get from you Anytime this chick is there for you Feelings imma share wit you Which makes it a Lil Mo clear for you x2 I really wanna be with you be with you But I gotta be real with you real with you

女婴 你知道我的处境有时候，我知道你不耐烦但你dont提出对表演获得掌声是否向法院经过litagations 我就帮遐把你像公主并提出一些对你的脖子谢遐畲族我捏hitta 当做起阵容并不是playin权我来替补，她风趣它听起来像即时几率遐但花时间从后座向乘客我们已经和creepin sneakin 刚刚把它从渗漏我们这么深的年freakin 我们dont睡上周末 wifey 有点紧张 wonderin为什么他搭档的家中半夜 itll予以好吧，如果男子跳车元首itll被扑灭但我说itll予以好吗来我真想与你与你但我干真正与你真正与你着我离开你独自独行我知道我的生活和成长但我让着去遐你的一个，我想在我的生命中希望我的人生已有一个妻子了妻子着离开你独自独行我知道我的生活和成长但我让着去遐你是不是有史以来走出线还是走出了口袋所以，我作了肯定的金丝雀寄出你的头发为了保护你，生病走出它公鸡你知道枪管的枪，我是足够大吐出火箭哦，你再拖扮演哑巴，如果警察不来，通过我干随时补足，如果我落不来通过但我知道，专卖店和商铺，你流经所以她的缔约方之一，并缔约方之一，你太你总是得到页每日，每周响另外你是不是太害羞做事情freaky 我并不是干把带手指我担心你tellin全世界即时你的新阿伦螺旋藻起初你somethin本人否认我将下滑刚做somethin在坐但shorty 照片theres东西，你提供造成entre痛是好的无somethin对方你知道我真想与你与你但我干真正与你真正与你着我离开你独自独行我知道我的生活和成长但我让着去遐你的一个，我想在我的生命中希望我的人生已有一个妻子了妻子着离开你独自独行我知道我的生活和成长但我让着去遐呵哦，我可寄至地球快我的女孩再拖杀了我，如果她的气味香，你的香水其再拖剪辑走向，如果我回去污渍与你唇光泽我倒退她で照顾，如果即时白金唱片如果她追上我用空枕包装所以保持对低下来致电carsely 你看到发生了什么大先生和r凯利你知道我从你随时这只小鸡有你投书感受分享您智慧这使它成为莫律清楚，你χ2 我真想与你与你但我干真正与你真正与你但我干真正与你真正与你着我离开你独自独行我知道我的生活和成长但我让着去遐你的一个，我想在我的生命中希望我的人生已有一个妻子了妻子着离开你独自独行我知道我的生活和成长但我让着去遐我真想与你与你但我干真正与你真正与你着我离开你独自独行我知道我的生活和成长但我让着去遐你的一个，我想在我的生命中希望我的人生已有一个妻子了妻子着离开你独自独行我知道我的生活和成长但我让着去遐

The ethylene glycol plays an important role in gelling process and it makes the organic-gel decomposed in several steps.

乙二醇在胶凝过程中起到重要的促进作用，使干凝胶粉分步分解。

AVOCADO OIL REFINED restores dry, dehydrated, and mature skin.

鳄梨油能够使干性，脱水和老化的皮肤得到修复。

The design of the dry-dock falling gate"s structure is researched, and integrates the disquisitions and analysis on the dynamic characteristics about dock gate, in order to make the cabin design more visualizing.(2) The emphasis of this paper is the influence of the water hole and gas hole in the tidal cabin and the influence of the drain of the air-operated cabin.(3) In this paper, the building method of the dry-dock falling gate"s parametric model is studied and the dynamic analysis is accomplished in ADAMS, furthermore, the rising-and-falling angle curve is drawn while the dry dock gate is rising and falling.(4) The paper is based on the apprehension of the past theories and researches about air-operated dry-dock falling gate, and is explicated by hydraulic rationales and rising-and-falling mechanical principles. This software is developed by inner programming language in ADAMS and VC. This design could shorten design cycle.

1研究了气控式干船坞卧倒门的结构设计，整合对卧倒门在海水中运动中的动力特性研究，使卧倒门的设计，特别使其舱格设计更具可视化；(2)重点讨论潮汐舱水孔气孔对卧倒门水上运动的影响，空气操作舱充排水对卧倒门运动的影响；(3)研究了气控式干船坞卧倒门仿真模型的参数化方法和过程，并在ADAMS中完成了系统的动力学分析，绘制出了卧倒门在起卧过程中的运动特性曲线；(4)通过对已有的气控式干船坞卧倒门的实验成果和成形理论的解读，在理解其起浮和卧倒机理基础上，应用VC和ADAMS二次开发语言进行设计软件开发，定制了友好的用户化中文人机交互界面，使设计人员可以方便快捷地对卧倒门门进行设计开发，缩短了设计周期。

The garlic Institute of Mechanical Technology, is part of the subordinate units, concentrated in the more than Xuhuai agricultural machinery, electrical and mechanical experts, and the many universities and research institutions, some 10 state-level annual returns for utility model patents and inventions, the Years of research developed a series of mechanical garlic, garlic peeling machine dry, garlic-valve machine, garlic field harvesting machines, the state invention patents, dry garlic is offline researchers with the Chinese company Nanjing Agricultural Machinery Institute of the Ministry of Agriculture research, The two of the latest patented technology products, the processing volume, from a net rate of injury rate on the three indicators have more breakthroughs in the dry and peeling machine output per hour breakthrough 500 kg, up to 800 kg / hour (the current market airflow Peeling machine 3 - 5 times).

本大蒜机械研究所是隶属于科技局的下属单位，集中了徐淮地区多名农机、机电专家，与全国多所大学和科研机构合作，每年申报十几项国家级发明和实用新型专利，经多年攻关研制出系列大蒜机械，其中大蒜干式脱皮机，大蒜分瓣机、大蒜田间收获机，获国家发明专利，干式大蒜脱机是公司科研人员与中国农业部南京农机研究所合作攻关，联合两项专利技术的最新产品，在加工量、脱净率，损伤率三项指标上有较大突破，使干式脱皮机每小时产量突破500kg，最高达800 千克/小时（是当前市场气流脱皮机的 3 — 5 倍）。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。