中心圆

词组短语

center circle

与中心圆相关的网络例句 [注：此内容来源于网络，仅供参考]

Consider the circle that is tangent to the curve at and has the same curvature there. Its center will lie on the concave side of the curve. This circle is called the circle of curvature. Its radius is the radius of curvature, and

在点处的曲线的法线上，在凹的一侧取一点，使得，以为圆心，半径为的圆叫做曲线在点处的曲率圆，曲率圆的圆心叫做曲线在点处的曲率中心，曲率圆的半径叫做曲线在点处的曲率半径。

We obtain the theorem of closed ball case in the continuous probabilistic metric space and the complete character theorem of Menger space.

以及球笼式等速万向节的偏心距与钢球中心圆半径之比进行了优化选择和比较。

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。

Primitive echinoderms having five or more feathery arms radiating from a central disk.

原始的棘皮动物，有五只或更多的软臂从中心圆盘放射状伸出。

In a hole in the center of this system is placed a subcritical sphere of fissionable material.

在这个系统的中心圆洞中放置一枚次临界的球形可裂变物质。

In this paper, a region approximation idea that means using a "fat curve" with a width to approximate the offset curve is proposed, and a complete set of algorithms to approximate offset curve using disk Bézier curve are given and implemented. In the algorithms, the optimal and uniform approximate curve of the offset curve as the central curve of the Disk Bézier curve is found by using Remez method, and then the upper optimal and uniform approximation principle is proposed to compute the error radius function of the Disk Bézier curve. Thus, the whole Disk Bézier curve can be obtained. In the end of this paper, the approximate effect of the Disk Bézier curve is not only analyzed and assessed, but also some specific examples are provided.

提出用一条带宽度的"胖曲线"来逼近上述等距曲线的区域逼近思想，并建立与实现了圆域Bézier曲线等距逼近的整套算法，包括应用Remez方法求出等距曲线的最佳一致逼近曲线作为圆域Bézier曲线的中心曲线，提出上控最佳一致逼近的原理求出圆域Bézier曲线的误差半径函数，以及确定整条圆域Bézier曲线，最后还对该圆域Bézier逼近的效果做了分析和考核，并给出了一些具体实例。

The disc type counter current chromatographic separation column comprises at least a or a plurality of discs provided with designing slots, clapboards at two sides of each disc, the cylinder rotating axis, an upper flange and a lower flange; the cylinder rotating axis is hollow and passes through the center of the upper flange, the lower flange, the discs and the clapboards; the inner edge and the outer edge of the upper flange, the lower flange, the discs and the clapboards are provided with a plurality of bolt pieces that fix the upper flange, the lower flange, the discs and the clapboards together.

一种多功能高效逆流色谱仪，它由盘式逆流色谱分离柱、配重体、行星架、柱体自转轴、行星轮、中心轮、中心公转轴、电机、传动装置、速度控制装置和保温机箱组成；所述的盘式逆流色谱分离柱，它包括有至少一个或多个设槽的圆盘、每个圆盘两侧的隔板、柱体自转轴和上法兰、下法兰；所述的柱体自转轴为空心，贯穿在上法兰、下法兰、圆盘及隔板的中心；在上法兰、下法兰、圆盘及隔板的内外边缘设有多个螺栓部件，将上、下法兰、圆盘及隔板固定在一起。

It's 15 hours, universal time,here is the news from the voice of american ,i'm david deforest from the VOA news center in washington.governments around the world are moving to boost the banks was more tie billion dollar beyer today.they are trying to get banks to rezoom london.and restore the stock and credit market that thread the push the world into a recession.but consider the government action we should many ,but not at all , that dasters.key stock markets in hongkong ,britain,germany and united stated gained between 4 and 10percents , a huge reversal from major loses suffers over the last week, but the key market in moxico dropped so sharply the trading was suspended.the british government has a anouncement it is partial renationalization three british banks with up to six billion dollars of taxpayer's money.president minister golden brown promises the unpresident bayer loud is it important step in foring out the frozen money market.from VOA time ravers has reported from london.you gonna both move the money again the british government wanna thirsty four billion dallors was the capital and into the royal bank scotland just less than thirty billion into loyal's tsben ach box.dunst tution is curtely really go shading emerge terms .prime minister golden brown says the stand by is do nothing with never anoption.the extrodinary retimes was financial martket seems to work .the government canos just made people ont the owe to be bufit about.

现在是格林尼治时间下午三点整，这是美国之音新闻节目。我是华盛顿新闻中心的大卫。世界各地政府今天正在积极给予银行几十亿美圆的紧急援助。他们试图让银行重新带领和开始已经停止的信贷时常，担心世界经济进入衰退。政府的协调动作鼓舞了许多企业，但并不是所有的投资者。在香港，英国，法国，德国和美国的重要股票都上升了4到10个百分点，自过去一个星期的损失中一次巨大的倒转。但是莫斯科的一个重要指数在停盘时积聚下滑。英国政府已经声明，三家部分国有化银行拥有纳税人630亿美圆。首相GB保证这次的前所未有的紧急援助对于金融市场的解冻十分重要。TOM在伦敦发回报道。又一次大胆行动以恢复金融市场，英国政府将注340亿美圆的资金在苏格兰皇家银行和只不到300亿美圆在Lloyds-TBS和HBOS，这两所机构现在正在重新谈判合作项目。首相GB说站在一边什么事不做永远不是一个选择。在现在特殊的时刻，金融时常停止工作，政府不能让人民将自己的利益推来推去。

The paper discusses the position relationship between the litter circles of torus and the section circle of sphere figured out the intersection of torus and sphere when the central axis of torus and sphere center in XOZ coordinate plane through coordinate transformation.

利用坐标变换使圆环中心轴与球心同在XOZ平面内，讨论了在该平面内圆环截圆与球圆的位置不相交、相切和相交时圆环面和球面的相交情况，并给出了判别圆环面、球面相交情况的流程图以及圆环面和球面相交实例。

Car at both ends of cutting surface, drilling central hole of the cylindrical Rough →→→ quenched Hole Research Center Xiu → semi-refined car of the cylindrical tank cars →→→ chamfering hobbing milling keyway →→→ Hole Research Center repair mill → test cut.

下料→车两端面，钻中心孔→粗车各外圆→调质→修研中心孔→半精车各外圆→车槽→倒角→铣键槽→滚齿→修研中心孔→磨削→检验。

与中心圆相关的网络解释 [注：此内容来源于网络，仅供参考]

center circle：中心圆

center 中心 | center circle 中心圆 | center of a ball 球心

central projection：中心投影

center-to-center spacing中心距 | central projection中心投影 | CH HD cheese head 开槽圆柱头

cylindric grinder：外圆磨床

cylindric center-type grinder 外圆中心磨床 | cylindric grinder 外圆磨床 | cylindric reamer 圆柱绞刀

quaquaversal：穹状圆项;由中心向四方扩散的

quaquaversalstructure穹状构造 | quaquaversal穹状圆项;由中心向四方扩散的 | quaquavsaldip穹倾斜

reel stretch：卷圆压.加工中心平 .分模

side s.制图tretch侧冲压平 .模具设计 | reel stretch卷圆压.加工中心平 .分模 | groove压线

satisfactorily：圆满地

"主考人员"(examiner)指根据本条例第74(1)条委任为主考人员的人;"考试中心"(examinationcentre)指海事处的考试中心;"符合资格所需的海上服务"(qualifyingseaservice)指第7条所指明并经第8条修改的海上服务;"圆满地"(satisfactorily)指令负责当局或监督感到满意;

Coscinodiscus centralis：中心圆筛藻

Corethron hystrix 小环毛藻 0 0 0 0 0 0 0 0 0 ... | Coscinodiscus centralis 中心圆筛藻 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.000 | Coscinodiscus eccentricus 心 圆筛藻 66 0 0 0 0 0 0 ...

Coscinodiscus centralis：粗刺膝沟藻 中心圆筛藻

透镜翼藻 星脐圆筛藻 Coscinodiscus asteomphalus | 粗刺膝沟藻 中心圆筛藻 Coscinodiscus centralis | 多边膝沟藻 Gonyaulax polyedra

Coscinodiscus eccentricus：心 圆筛藻

Coscinodiscus centralis 中心圆筛藻 0 0 0 0 0 ... | Coscinodiscus eccentricus 心 圆筛藻 66 0 0 0 0 0 0 0 0 0 0 22 44 0 0 0 0 0 0 0 0 0 22 0 0 0 0 154 0.057 | Coscinodiscus lineatus 线形圆筛藻 0 0 0 0 0 ...

Cyclosporae,Cyclosporeae：无孢子纲,圆孢纲

cyclospermous 具中心胚乳的 | Cyclosporae,Cyclosporeae 无孢子纲,圆孢纲 | Cyclostomata 圆口纲