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.

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It is indicated that the updrafts of the Arabian Sea meridional cell tube and the south zonal cell tube arrive in the SCS at the same time in May, which brings strong convective precipitation. Meanwhile, the westerly of the meridional cell tube and the southerly of the south zonal cell tube combine together to form the southwesterly at the low levels, resulting in the onset of the SCS monsoon.

研究發(fā)現(xiàn)阿拉伯海經(jīng)向環(huán)流管的上升氣流和南半球緯向環(huán)流管的上升氣流在5月份同時到達南海亚洲精品国产精品999，經(jīng)向環(huán)流管低層的偏西風和緯向環(huán)流管低層的偏南風共同組成西南風看美国黄片，于是5月份西南季風在南海地區(qū)首先爆發(fā)。

My body is going up in the air.

我的身體正在向上升人人射人人干人人操。

There's also postglacial rebound, with the crust and mantle that were depressed by the huge ice sheets that sat on the surface during the last ice age now rebounding upward on the order of a centimeter a year.

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In the fields the corn was waving like the sea; in the ditches red and yellow flowers were growing; while wild-drone flowers, and blooming convolvuluses were creeping in the hedges; and towards evening the moon rose round and large, and the haycocks in the meadows smelt so sweetly.

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The southwest vortex restricted the development of the plateau vortex in some way at the early stage when it appeared in the lower atmosphere. When they were coupled longitudinally, the vertical difference caused by the different vorticity advections between the upper and lower levels excitated the updrafts under 500 hPa and strengthened cyclone vorticity, and then the positive vorticity at 500 hPa and 700 hPa increased by two times The change rate of positive vorticity facilitated the plateau vortex to move eastward.

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Using maximum flooding surface and local explosure erosion surface as the correlation framework surface in the 4-th hierarchical base-level cycles, sand-body in the 3-th hierarchical base-level cycles formed in the 4-th hierarchical base-level cycles may be correlated layer by layer. The law of the sand-body and the characters of reservoir heterogeneity formed in the 4-th hierarchical base-level cycles are discussed. The study shows:①During early period of the 4-th hierarchical base-level cycle rising, subaqueous distributary channel formed, continuously stacked vertically, and migrated in limit range laterally, and channel sand-body stretches farther longitudinally, and lacks interbeds of mud rock and siltsand in sand rock, reservoir heterogeneity is relatively weak.②During mid-period of the 4-th hierarchical base-level cycle rising, subsaqueous distributary channel migrated actively, channel divided and converged strongly to form netted sand-body and sand sheet mainly, but interbeds of mud rock and siltsand increases gradually in sand-body, reservoir heterogeneity increased.③During later period of the 4-th hierarchical base-level rising and early period of the 4-th hierarchical base-level falling, reservoir sand-body was poor, and only form thin sand-body of subsaqueous distributary channel, subsaqeuous creveas and distal mouth bar, sand-bodys are surrounded by mud and silt rock.

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Example: Turning right, the right tip of the wing goes down and the left side is goes up, thus we rotate about an axis through the center of the wing.

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DOWN ESCALATOR：向下上升進程 (下行電扶梯)

25. Dodge Ram 道奇牌公羊 (卡車) 閃躲的隨機存取存儲器 | 26. down escalator 向下上升進程 (下行電扶梯) | 27. dry beer 口渴的啤酒;乾的啤酒

FIN：鰭

另一個在火山丘上形成的現(xiàn)象被成為"鰭"(fin)或"板"(slab). 大約半個足球場大小的冷卻了的火山巖以每天2米的速度被推著向上升. 2006年6月中,巖板開始在頻繁的巖崩中破裂,同時還在不斷的受擠壓上升. 這時火山丘的最高高度是2301米,

oblique inflow：上升斜流

oblique incidence 斜入射 | oblique inflow 上升斜流 | oblique inflow 斜向進流

rearwards：在后面; 向后面 (副)

rearward 在背后, 向后方 (副) | rearwards 在后面; 向后面 (副) | reascend 再上升 (動)

slab：板

另一個在火山丘上形成的現(xiàn)象被成為"鰭"(fin)或"板"(slab). 大約半個足球場大小的冷卻了的火山巖以每天2米的速度被推著向上升. 2006年6月中,巖板開始在頻繁的巖崩中破裂,同時還在不斷的受擠壓上升. 這時火山丘的最高高度是2301米,

upcurrent：上升氣流 向上游

upcountry /內(nèi)陸的/ | upcurrent /上升氣流/向上游/ | update /更新/

Rise of Moontide and Magi：月潮與魔法的上升

Riddlemaster of Hed 御迷士海德 | Rise of Moontide and Magi 月潮與魔法的上升 | River into Darkness 向暗之河

reascend：再上升 (動)

rearwards 在后面; 向后面 (副) | reascend 再上升 (動) | reasonable 合理的, 適當?shù)? 明理的 (形)

reascend re：再 再上升,再升高

ascent ascend轉成的名稱 上升,升高登高 | reascend re再 再上升,再升高 | descend de下,向下,scend爬 下降,傳下,遺傳

update upgrade uprate upsurge：改進,上升

up- 在(向)上方 upside uphill upriver upstairs | 改進,上升 update upgrade uprate upsurge | 打亂 upset uproar uptoot uprising