查询词典 radial field

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。

Direction of the human radial artery by the cubital fossa at the midpoint of the bottom of 2.5CM connection to the radial styloid process is not a vertical direction of blood vessels, a large number of data measurement, based on the basis of the treatment instrument designed to meet the ergonomic parameters of the radial artery into the actual trajectory of the laser positioning warehouse ladder-type arrangement, thus ensuring the laser projection domain and the radial artery into a high degree of matching of the laser spot can be an accurate projection exposure to the region in the radial artery through the line to avoid exposure is invalid.

人体桡动脉的走向是由肘窝中点下方2.5CM处至桡骨茎突的连线，并非是一条垂直走向的血管，在大量数据测量的基础上，本治疗仪依据人体工程学参数设计了符合桡动脉血管实际走向轨迹的激光定位仓阶梯型排列，从而保证了激光器投影域与桡动脉走向的高吻合度，使激光投影的光斑能准确照射在桡动脉循行区域，避免无效照射。

The results were as follows the airdried density ( moisture content of wood is 12%), the basic density and the ovendry density were 0.583 g·cm-3, 0.462 g·cm-3 and 0.507 g·cm-3 respectively, the airdried density was at the medium level in domestic wood species;the shrinkage coefficient of radial, tangential and volumetric were 0.099%, 0.183% and 0.296% respectively, the maximum swelling were 4.106%, 7.958% and 12.627% respectively;the ratio of tangential shrinkages to radial shrinkages was 1.5-1.9;the toughness was 52.12 kJ·m-2;the hardness of cross, radial and tangential section were 41.53 MPa, 31.41 MPa and 35.51 MPa respectively;the compressive strength parallel to grain was 44.50 MPa ;the modulus of elasticity in static bending and the bending strength were 12.63GPa and 127.31 MPa respectively;the shearing strength parallel to grain of radial and tangential were 8.76 MPa and 10.54 MPa respectively;the cleavage strength to grain of radial and tangential were 124.3 N·mm-1 and 138.6 N·mm-1 respectively.

结果表明大叶栎木材的气干密度（含水率为12％）、基本密度和全干密度分别为0.583 g·cm-3、0.462 g·cm-3和0.507 g·cm-3，气干密度属于国产木材的中等级水平；径向、弦向和体积干缩系数分别为0.099%、0.183%、0.296%，湿胀率依次为4.106%、7.958%和12.627%，差异干缩为1.5-1.9，其尺寸稳定性较好；冲击韧性为52.12 kJ·m-2，端面、径面和弦面硬度分别为41.53 MPa、31.41 MPa和35.51 MPa，顺纹抗压强度为44.50 MPa，抗弯弹性模量和抗弯强度分别为12.63 GPa和127.31 MPa，径面和弦面顺纹抗剪强度分别为8.76 MPa和10.54 MPa，抗劈强度依次为124.3 N·mm-1和138.6 N·mm-1。

In the process of practical operation of radial gates, the vibration of radial gates often occurs in the following situations: when radial gate is being opened or closed or part-opened, and sometimes even under the completely closed condition. Under some situations, the vibration of radial gate is so serious that the dynamic failures of radial gates or dynamic instability of some gate components may happen.

弧形闸门的运行实践表明，闸门在启闭过程或局部开启时，甚至在关闭挡水时，常常产生振动，振动有时会达到相当严重的情况，从而可能引起闸门的动力破坏或某些构件的动力失稳。

First, in order to verify the correct of this retrieval month, by using the data of three-dimensional wind field, raininess field and temperature field that are output by MM5 numerical simulation, we climate the radial velocity field and echo intention field in the in-phase observation area of Dual-Doppler radar, then, on the base of the upwards retrieval theory and using the radial velocity field and echo intention field in the in-phase observation area of Dual-Doppler radar, we retrieve the atmospheric three-dimensional wind field.

首先，为检验此种反演方法的可靠性，我们使用MM5数值模式输出的三维风场、雨强场、温度场等数据，分别模拟生成两部雷达同步观测区的径向速度场和回波强度场，然后根据以上的反演理论利用模拟的双多普勒天气雷达观测到的径向速度场和回波强度场反演出大气三维风场。

The main contributions of the second part of this dissertation are focused on the cryptographic properties of logical functions over finite field, with the help of the properties of trace functions, and that of p-polynomials, as well as the permutation theory over finite field: The new definition of Chrestenson linear spectrum is given and the relation between the new Chrestenson linear spectrum and the Chrestenson cyclic spectrum is presented, followed by the inverse formula of logical function over finite field; The distribution for linear structures of the logical functions over finite field is discussed and the complete construction of logical functions taking on all vectors as linear structures is suggested, which leads to the conception of the extended affine functions over finite field, whose cryptographic properties is similar to that of the affine functions over field GF (2) and prime field F〓; The relationship between the degeneration of logical functions and the linear structures, the degeneration of logical functions and the support of Chrestenson spectrum, as well as the relation between the nonlinearity and the linear structures are discussed; Using the relation of the logical functions over finite field and the vector logical functions over its prime field, we reveal the relationship between the perfect nonlinear functions over finite field and the vector generalized Bent functions over its prime field; The existence or not of the perfect nonlinear functions with any variables over any finite fields is offered, and some methods are proposed to construct the perfect nonlinear functions by using the balanced p-polynomials over finite field.

重新定义了有限域上逻辑函数的Chrestenson线性谱，考察了新定义的Chrestenson线性谱和原来的Chrestenson循环谱的关系，并利用一组对偶基给出了有限域上逻辑函数的反演公式；给出了有限域上随机变量联合分布的分解式，并利用随机变量联合分布的分解式对有限域上逻辑函数的密码性质进行了研究；给出了有限域上逻辑函数与相应素域上向量逻辑函数的关系，探讨了它们之间密码性质的联系，如平衡性，相关免疫性，扩散性，线性结构以及非线性度等；讨论了有限域上逻辑函数各类线性结构之间的关系，并给出了任意点都是线性结构的逻辑函数的全部构造，由此引出了有限域上的"泛仿射函数"的概念；考察了有限域上逻辑函数的退化性与线性结构的关系、退化性与Chrestenson谱支集的关系；给出了有限域逻辑函数非线性度的定义，利用有限域上逻辑函数的非线性度与相应素域上向量逻辑函数非线性度的关系，考察了有限域上逻辑函数的非线性度与线性结构的关系；利用有限域上逻辑函数与相应素域上向量逻辑函数的关系，揭示了有限域上的广义Bent函数与相应素域上的广义Bent函数的关系，以及有限域上的完全非线性函数与相应素域上向量广义Bent函数之间的关系；给出了任意有限域上任意n元完全非线性函数存在性与否的完整证明，并利用有限域上平衡的p-多项式的性质给出了有限域上完全非线性函数的一些基本构造方法。

A hemadynamometer has an air bag designed for attaining oppression or ischemia of radial artery only without oppressing ulnar artery, with a length of the bag made, when the bag is wound on a user's wrist on its radial side starting from such hard organization area as tendons on palm side of the wrist through the radial artery, to reach at least styloid process of radius but not to reach the ulnar artery, and with a width set for locally oppressing the radial artery at least substantially right above the styloid process of radius in longitudinal direction of the wrist.

一种用来仅对桡骨动脉进行压迫并使其局部缺血而不对尺骨动脉进行压迫的血压测量计，它具有一气囊，气囊具有一定长度，当将气囊裹绕在使用者手腕上，使气囊从如手掌侧上的各腱这种坚实组织区域开始作为起点，伸展经过桡骨动脉时，所述气囊可以至少到达桡骨茎突，但不能到达尺骨动脉，所述气囊具有一宽度，该宽度设定得可以至少在沿手腕纵向、在桡骨茎突的基本正上方的位置处、对桡骨动脉进行局部地压迫。

objective to assess the effects to utilize minitype plate internal fixation in radial head fracture of mason ⅲ.methods 10 cases of patients with closed radial head fracture under went minitype plate internal fixation by open reduction,and the functional evaluation of elbow was carried out by the pain,stability,myodynamia of elbow,together with the elbow joint score of broberg and morrey.results in 10 case of patients with 12～24 months follow up(average time 20 months),the elbow joint mean score is 58(30～90) with excellent case 1,good 4,poor 5,and the fineness rate is 50％.conclusion it is failed to treat complicated radial head fracture by minitype plate internal fixation,while maybe it is better to resect or replace radial head for these types.

目的 评价微型钢板治疗masonⅲ型桡骨小头骨折的临床效果。方法对10 例masonⅲ型骨折进行微型钢板内固定，根据患者肘关节活动疼痛、稳定性和肌力情况，依照broberg和morrey肘关节评分标准进行功能评价。结果 10 例患者随访12～24个月，平均20个月，肘关节平均评分58 分(30～90)分，其中优1 例，良4 例，差5 例，优良率50％。结论切开复位微型钢板内固定治疗复杂的masonⅲ型桡骨小头骨折，不能取得良好的临床效果，如果要获得较好的肘关节活动和早期康复，可考虑桡骨小头切除或置换。

Daubechies'wavelet frame theorem is extended from one dimension to n dimensions. According to this framework, an example of n-dimensional radial wavelet is given. Differing from tensor product multidimensional wavelet, the radial wavelet is inseparable, locally supported and infinitely differentiable. The family, obtained by dilations and translations from this radial wavelet, constitutes a special type of radial wavelet frame in L〓.

Daubechies的框架定理推广到了n维情形，同时，也按照这一理论框架，给出了高维二进径向小波的具体例子，具有下列性质：ψ是无穷次连续可微的；ψ是局部支撑的，支集为‖x‖≤1；ψ含有分式因子，因此对&奇异点&更为敏感；ψ是不可分的，不同于张量积形式的高维小波；ψ是各向同性的。

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

But this is impossible, as long as it is engaging in a market economy, there are risks in any operation.

但是，这是不可能的，只要是搞市场经济，是有风险的任何行动。

We're on the same wavelength.

我们是同道中人。