成油的

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 main research work of this paper are focused on following areas:(1) Based on review of the theory and methods on measurements of particle fields, a new idea for obtaining particle size and velocity distribution within a spray through imaging the particle field with a laser light sheet was put forward;(2) A DPIV (Digital Particle Image Velocimetry) system, is fit for velocity measurements of low speed flows, was developed and expended to particle size distribution measurement;(3) An arithmetic for particle velocity field reconstruction was developed, and the velocity distribution of water mist was also obtained;(4) A software system for particle analysis, which based on image geometry emend, de-noise and image partition was developed, the parameters such as particle size distribution, mean diameter, number of particles, minimum and maximum diameter can be got with this system;(5) A water mist system was developed and its characteristics, such as droplet velocity, size distribution, number of droplets and spray cone angle under different conditions were obtained from experiments with PIVS;(6) The measurement results of water mist characteristics with PIVS were compared and analyzed with the simply simulated results, and in addition, in order to verify the accuracy of PIVS, some experiments were conducted with the standard particles, such as glass-ball with known mean diameter of 50μm and 115μm, metallic coated tracing particle with mean diameter of 12μm;(7) Some experimental studies on interaction of water mist with liquid pool fires were conducted.

本论文的主要工作包括以下几个方面：（1）在对粒子场测量的相关理论和具体方法进行综述分析的基础上，提出了通过采用激光片光对粒子场进行成像以获取其粒径和速度等参数分布的新思路；（2）研制了适宜于低速流动速度场测量的DPIV(Digital Particle Image Velocimetry)系统，并使其实现了对粒子场粒径分布的测量功能；（3）研制了基于粒子运动轨迹的速度场重建算法，获取了细水雾雾场的速度分布；（4）研制了基于几何校正、去噪、图象分割等图象处理方法的"粒度分析软件系统"，该系统既可分析给出粒子场的粒径分布直方图和平均粒径，还可给出粒子的数目以及最大、最小粒径等信息；（5）建立了一细水雾发生系统，并应用上述方法对不同压力条件下细水雾系统的雾场特性（如速度分布、雾滴粒径分布、雾滴的数目、喷雾张角以及雾化长度等）进行了实验测量研究；（6）对细水雾特性参数的PIVS测量结果与计算机简单模拟计算结果进行了定性比较分析，并利用平均粒径为50μm和115μm的玻璃球以及12μm的标准示踪粒子对PIVS系统的粒径和速度测量结果进行了实验验证，同时对其局限性进行了分析讨论；（7）对不同工况条件下细水雾与油池火相互作用的过程进行了模拟实验研究。

Not to inherit by right of primogeniture, gavelkind or borough English, or possess in perpetuity an extensive demesne of a sufficient number of acres, roods and perches, statute land measure (valuation 42 pounds), of grazing turbary surrounding a baronial hall with gatelodge and carriage drive nor, on the other hand, a terracehouse or semidetached villa, described as Rus in Urbe or Qui si sana , but to purchase by private treaty in fee simple a thatched bungalowshaped 2 storey dwellinghouse of southerly aspect, surmounted by vane and lightning conductor, connected with the earth, with porch covered by parasitic plants, halldoor, olive green, with smart carriage finish and neat doorbrasses, stucco front with gilt tracery at eaves and gable, rising, if possible, upon a gentle eminence with agreeable prospect from balcony with stone pillar parapet over unoccupied and unoccupyable interjacent pastures and standing in 5 or 6 acres of its own ground, at such a distance from the nearest public thoroughfare as to render its houselights visible at night above and through a quickset hornbeam hedge of topiary cutting, situate at a given point not less than 1 statute mile from the periphery of the metropolis, within a time limit of not more than 15 minutes from tram or train line (e.g., Dundrum, south, or Sutton, north, both localities equally reported by trial to resemble the terrestrial poles in being favourable climates for phthisical subjects), the premises to be held under feefarm grant, lease 999 years, the messuage to consist of 1 drawingroom with baywindow (2 lancets), thermometer affixed, 1 sittingroom, 4 bedrooms, 2 servants' rooms, tiled kitchen with close range and scullery, lounge hall fitted with linen wallpresses, fumed oak sectional bookcase containing the Encyclopaedia Britannica and New Century Dictionary, transverse obsolete medieval and oriental weapons, dinner gong, alabaster lamp, bowl pendant, vulcanite automatic telephone receiver with adjacent directory, handtufted Axminster carpet with cream ground and trellis border, loo table with pillar and claw legs, hearth with massive firebrasses and ormolu mantel chronometer clock, guaranteed timekeeper with cathedral chime, barometer with hygrographic chart, comfortable lounge settees and corner fitments, upholstered in ruby plush with good springing and sunk centre, three banner Japanese screen and cuspidors (club style, rich winecoloured leather, gloss renewable with a minimum of labour by use of linseed oil and vinegar) and pyramidically prismatic central chandelier lustre, bentwood perch with fingertame parrot, embossed mural paper at 10/- per dozen with transverse swags of carmine floral design and top crown frieze, staircase, three continuous flights at successive right angles, of varnished cleargrained oak, treads and risers, newel, balusters and handrail, with steppedup panel dado, dressed with camphorated wax: bathroom, hot and cold supply, reclining and shower: water closet on mezzanine provided with opaque singlepane oblong window, tipup seat, bracket lamp, brass tierod and brace, armrests, footstool and artistic oleograph on inner face of door: ditto, plain: servants' apartments with separate sanitary and hygienic necessaries for cook, general and betweenmaid salary, rising by biennial unearned increments of 2 pounds, with comprehensive fidelity insurance, annual bonus (1 pound and retiring allowance (based on the 65 system) after 30 years' service, pantry, buttery, larder, refrigerator, outoffices, coal and wood cellarage with winebin for distinguished guests, if entertained to dinner, carbon monoxide gas supply throughout.

505他并不想根据长子继承制、男子平分继承制或末子继承制，把那幢有着门房和马车道的男爵宅邪及其周围那一大片辽阔的英亩、路得和平方杆法定土地面积单位，（估价为四十二英镑的泥炭质牧场地，或者那座被描述为&都会中的田园&或&健康庄&的有阳台的房子或一侧与邻屋相接的别墅，继承下来并永久占有。他只巴望根据私人合同购买一所继承人身分不受限制的不动产：要坐北朝南的一座草屋顶、有凉台的双层住宅，房顶上装起风向标以及与地面相接的避雷针，门廊上要爬满寄生植物，橄榄绿色的正门最后一道工序漆得漂漂亮亮，赛得过马车。门上有着精巧的黄铜装饰。房屋正面是灰泥墁的，屋檐和山墙涂着金色网眼花纹。尽可能让房子耸立在坡度不大的高台上，从那圈着石柱栏杆的阳台上，隔着现在空着、将来也不得占用的牧场地，可以聎望四周的一片好景致。单是自己的庭园，就有五、六英亩之谱。它与最近的公路的距离适度：夜晚从修剪得整整齐齐的鹅耳枥树篱上端和缝隙间，可以瞥见室内的灯光，从首都边界的任何地点丈量，与这所房子相距至少也有法定一英里。不出十五分钟就可以轰电车或火车铁道沿线。（例如往南去登德鲁姆或往北去萨顿，就像是南北两极。经过验证，据说这两处气候都适合肺结核患者。）凭着继承人身分不受限制的不动产转让证拥有房屋和地基，租借期限为九百九十九年。宅邸里包括一间有着凸窗的客厅，一间起居室，四间卧室，两间仆役室。砌了瓷砖的厨房里还安装了多用途的铁灶和洗涤台，休息厅里备有放亚麻布床单衬衫用的壁橱，分成几层的氨熏橡木书柜，放着《大英百科全书》和《新世纪辞典），横陈着一把把中世纪或东洋的古老刀剑；还有通知开饭的锣，雪花石膏做的灯，悬垂着的饰钵，附有电话号码簿的胶木自动电话听筒；手织的阿克斯明斯特地毯，是奶油色质地，周围镶着棋盘图案。有着兽爪形柱脚的牌桌。壁炉装着大型黄铜格栅，炉台上摆着精密的镀金计时表，准确无误地发出大教堂那样的钟声，附有湿度计的晴雨表，蒙着鲜红色长毛绒面子、装着上等弹簧、中心部位富于弹性的舒适的长靠椅和放在角落里的备用椅，日本式三扇屏风，痰盂（俱乐部里摆的那种，用深紫红色皮革制成，只要用亚麻子油和醋一擦，不费吹灰之力就能发出光泽，焕然一新。）室中央悬挂一盏金字塔式枝形吊灯，射出灿烂的光辉。一截弯木上栖着一只驯顺得能停在手指上的鹦鹉，墙上糊着每打价为十先令的压花壁纸，印着胭脂红色垂花横纹图案，顶端是带状装饰；一连三段栎木楼梯，接连两次拐成直角，都用清漆涂出清晰的木纹，梯级、登板、起柱、栏杆和扶手，一律用护板来加固并涂上含樟脑的蜡；浴室里有冷热水管，盆汤、淋浴，设备俱全。位于平台上的厕所里，长方形窗子上嵌着一块毛玻璃，带盖的坐式抽水马桶，壁灯，黄铜拉链和把手，两侧各放着凭肘几和脚凳，门内侧还挂有艺术气息浓厚的油画式石版画。另外还有一间普通的厕所；厨师、打杂的女仆和兼做些细活的女佣的下房里也分别装有保健卫生设备（仆役的工钱每两年递增两英镑，并根据一般忠诚勤劳保险，每年年底发奖金一英镑，对工龄满三十年者，按照六十五岁退职的规定，发退职金）；餐具室、配膳室、食品库、冷藏库、主楼外的厨房及贮藏室等、堆煤柴用的地窨子里还有个葡萄酒窖（不起泡、亮光闪闪的葡萄酒），这是为宴请贵宾吃正餐时预备的。对整座楼房都供应一氧化碳瓦斯。

A method for producing fatty acid alkyl esters and/or glycerin comprising a step of bringing a fat or oil into contact with an alcohol in the presence of a catalyst, wherein the catalyst is at least one catalyst selected from the group consisting of the following to: a metal oxide having an ilmenite structure and/or a slyrankite structure; an oxide containing a metallic element belonging to the Group 12 and a metallic element belonging to the Group 4; a mixed oxide containing a metallic element belonging to the Group 12 and a tetravalent transition metallic element; a metal oxide containing zirconium and at least one metallic element selected from the group consisting of metallic elements belonging to the Groups 4, 5 and 8; and a metal oxide containing anatase type titanium oxide and/or rutile type titanium oxide, and the metal oxide containing a sulfur component of 700 ppm or less.

脂肪酸烷基酯和/或甘油的制造方法包括在催化剂的存在下使脂肪或油与醇接触的步骤，其中，所述催化剂是选自由下列～所组成的组中的至少一种催化剂：具有钛铁矿结构和/或斯里兰卡石结构的金属氧化物；含有属于第12族的金属元素和属于第4族的金属元素的氧化物；含有属于第12族的金属元素和四价过渡金属元素的混合氧化物；含有锆和选自由属于第4、5和8族的金属元素所组成的组中的至少一种金属元素的金属氧化物；和含有锐钛矿型氧化钛和/或金红石型氧化钛的金属氧化物，并且所述金属氧化物含有的硫成分为700ppm以下。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。