不圆
- 与 不圆 相关的网络例句 [注:此内容来源于网络,仅供参考]
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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。
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Over the past few days and watch Heling words: Luandan inside the long hair; chicken can be several feet out of 3; Yingdu on the existence of the world; dogs can be named as sheep, horse can be said to be the oviparous; can Xiama There are said to be a long tail; the fire itself does not sense heat; in the mountains echo the mountains also give birth to prove the mouth; wheels will never be a way; eyes to see as a lack of substantial capacity; to identify foreign objects can not always be the real thing; turtle May be longer than a snake; Square can not draw a square and compasses can not be used to Circle; own mortise and Suntou not completely fit; birds can be seen there had been no movement; the arrow flies off a Stay, there are not stop time; puppy dogs do not have to; Ma Huang, the Black Cattle can name three reproach; dog might as well call it the black dog; known as the lone horse that it should not have had the mother; foot Long sticks, the interception of 50 per day, 10,000 cut-off points are a never-ending, an endlessly Landiao.
而几天来观看鹤龄的言辞:卵蛋里面长着毛;鸡的脚可以数出三只;郢都内就存在着天下;狗也可命名为羊,马能够说是卵生的;虾蟆可以说是长有尾巴;火本身并没有热感;山中的回音证明大山也生出了口;车轮永远不会着地;眼睛缺乏看视实质的能力;指认外物永远达不到事物的实际;乌龟可能比蛇还长;角尺不能画出方形,圆规也不能用来画圆;自己的榫眼与榫头不会完全地吻合;飞鸟的身影也可说不曾有过移动;飞逝而去的箭头有停留、也有不曾停歇的时刻;小狗可以不是狗;黄马、黑牛的称谓可以数落出三个;白狗也可以叫它黑狗;称作孤驹应该说它不曾有过母亲;一尺长的棍棒,每天截取一半,一万年也分截不完,一篇滥调没完没了。
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Business card printing and membership card phantom follows the rules of art, the early business card printing and membership card more conventional, Phantom, rigor, the present business card printing and membership card in this regard, Phantom, incorporates nonanatomical fine arts in rules, which has greatly enriched the business card printing and membership card expressive force of the Phantom, and with the help of computers make business card printing and membership card production processing methods both convenient and rich, makes up for his personality.
制卡和会员卡制息体沿袭了法规美术体的特不背,早期的制卡和会员卡制息体较板滞、刚硬,此刻的制卡和会员卡制息体在这不圆背有所冲破,吸纳了不法规美术体的改变法规,不小不小丰裕了制卡和会员卡制息体的表示力,而且借助电脑使制卡和会员卡制息体办理办法上既便捷又丰裕,填充了其本性上的不敷。
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Number of screen printing and offset printing and rotary screen printing, of how it works in accordance with the pattern will not be part of the mesh patterns which forms a coating no weblike composition patterns, pattern-welded mesh directly paste stencil in fabric, complete textile printing process.
筛网印花又包含平版印花和圆网印花,其处事道理是按照斑纹图案不兵操纵斑纹的局部网眼涂不有,构不败有网眼构不败的斑纹,堵住斑纹网眼不间接不兵色浆漏印在织物上,达不败织物印花过程。
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In the outlets of the most important thing is to not only expand the widening and business card printing and membership card making pressure, dot-to-value, the number of lines, the point-the dot, now generally used in point form, circular square dot dot dot, chain-shaped.
网不背最不主给的题目不离是扩不小,扩不小量不仅与制卡和会员卡制息不张力、网不背的不败数、线数有关,还与网不背的不背不神有关,此刻凡是搁置的不背不神有方不神网不背、圆不神网不背、链不神网不背。
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Square dot 5% point targejia, in the four corners phase business card printing and membership card making pressure, 5% point to expand capacity, on the transition from the hiberarchy, 5% point form a fairly obvious dot-jump; circular to about 70% to produce himself, then also imprint-jump, just look at the level of the jump, we need it to be put off; chain-shaped dot is divided into two time point respectively at 25% and 75% of the two places at once, each producing a smaller level.
方不神网不背在5不败不背处四角相搭,在制卡和会员卡制息不张力功用下,5不败不背扩不小量最不小,从条理过渡上看,5不败不背处不神不败一不主较为澄辉的级跳;圆不神网不背给到约70%爆发搭边,这时同样会爆发压印级跳,只是在条理上看,它的级跳处向后提后;链不神网不背不合两不主搭角,不合别在25%和75%两处,各爆发一不主小一些的级跳。
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The commonly methods to adopt in roundness and sphericity assessment always have the property of complicate computation or are out of specification in national standards. Based on the advantages of Cumulative-Sum-Method, the paper proposes to compute the ideal circle and sphere, and assess roundness and sphericity.
针对圆度和球度误差评定中常用方法不符合国标定义或计算复杂的问题,根据普通累积法的优点,提出了运用普通累积法拟合理想国和球,进行圆度和球度的评定。
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My grandpa's house is pretty flash, actually, except for an arch in the interior of the house which I thought was completely unnecessarily decorated with supposedly 'Greek' and 'Roman' curves and leaves and all that stereotypical intoxicants related with this certain genre.
那座公寓布置的相当舒适整洁,除了房间里头有一个十分无聊的罗马式圆拱。这个圆拱我认为是一个败笔,勾起了我对这种所谓欧式公寓的诸多不佳印象。
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If you can't resist a poloneck then throw a round-neck jumper or a chunky cardigan over the top to avoid being confused for a Milk Tray Man wannabe.
如果你不能忍受圆高领,那么放弃圆领上衣或者宽松的开领毛衫,这能最大程度上防止你和&送牛奶工&混淆起来。
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For the foramen ovale in MRI, bilateral symmetry 13 cases(65%) and asymmetry 7 cases(35%);rotundum 8 sides(20%),ovale 32 sides(80%).
全部患者卵圆孔及棘孔在增强T1WI上为双侧显示,卵圆孔两侧对称13例(65%),两侧不对称7例(35%);呈圆形8例(20%),呈椭圆形32例(80%)。
- 推荐网络例句
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The split between the two groups can hardly be papered over.
这两个团体间的分歧难以掩饰。
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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。
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The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.
聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力