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.

理論分析和試驗研究表明： 1球軸承振動是鋼球—滾道接觸副中的各種摩擦學(xué)作用引起的，具有摩擦動力學(xué)的本質(zhì)3P视屏，任何對接觸副的摩擦學(xué)特性有影響的因素都將對球軸承的振動和噪聲特性產(chǎn)生影響国产一级A片午夜无码免费古装； 2中心軸向載荷作用下，載荷增大使球軸承的固有振動頻率升高日韩无码精品乱伦一区二区，載荷越大同樣的載荷增幅引起的頻率升幅減小日本美女乱子伦A片视频免费观看，足夠大的中心軸向載荷作用下載荷的變化對球軸承振動的頻率特性不會產(chǎn)生明顯的影響； 3軸向和徑向聯(lián)合載荷作用下欧美精品中文字幕在线视频，徑向載荷不大時球軸承振動的固有頻率基本不變美女扒开腿让男人桶爽免费动态图，但是可能引起變剛度激勵的非線性振動，出現(xiàn)新的頻峰国产AAA免费黄色视频，過大的徑向載荷將使部分鋼球脫離接觸，使球軸承的振動和噪聲呈現(xiàn)不穩(wěn)定狀態(tài)免费人成a； 4潤滑對球軸承的振動和噪聲特性有重要的影響欧美性爱精品店，良好的潤滑對振動有明顯的抑制作用，潤滑不充分時黄色视频一、二、三区，振動和噪聲的水平會有明顯增高人人干人人射视频，一定條件下還會激發(fā)接觸副中的諧振，發(fā)出嘯聲午夜福利120，造成接觸表面的傷害操东北妇女视频，無潤滑干接觸時色播影院性播影院午夜私人影院，短時的運轉(zhuǎn)就會損傷接觸副表面，使振動和噪聲迅速增大亚洲色图精品录音，并隨時可能引發(fā)嚴(yán)重的磨損和卡滯失效熟女乱伦91视频一区；接觸副潤滑良好時，油膜的"剛化效應(yīng)"使球軸承振動的固有頻率有所提高网站黄色在线，潤滑劑中含有彌散性污濁時久久免费A级毛片，振動的幅度總體升高，但彌散性污濁不會改變球軸承振動的頻率特性timi8.com；浙江大學(xué)博士學(xué)位論文：球軸承振動的研究 5低速時欧美熟妇BBW，球軸承振動的基本特征呈現(xiàn)不穩(wěn)定狀態(tài)，隨著轉(zhuǎn)速的提高人人操人人www.452e.com，球軸承振動的頻率特性趨于穩(wěn)定国产XXXX在线观看免费视频，固有頻率頻峰升高； 6理論分析表明美女黄应用，干接觸時鋼球和滾道表面波紋度的某些諧波分量能激勵球軸承的振動H纯肉无遮挡3d动漫在线，振動的幅值與諧波幅值成正比，實際球軸承中鋼球的分布不可能完全均勻日韩视频第一区，波紋度的激勵作用會隨時發(fā)生欧美色中色；潤滑接觸的分析表明，波紋度的任意諧波分量均能激勵球軸承的振動国产另类重口调教在线； 7球軸承的幾何和結(jié)構(gòu)參數(shù)分析表明欧美A色黄毛一片，球軸承尺寸越大，徑向欧美国产第页、軸向和角振動的固有頻率越低日韩高清不卡福利片视频；鋼球中心圓直徑增大，球軸承的徑向和軸向振動的固有頻率基本不變欧美VA免费播放，角振動的固有頻率有所上升人人摸久久国产精品，振動的幅頻特性基本不變；徑向游隙加大使球軸承的徑向振動固有頻率降低11孩岁女精品A片男，軸向和角振動的固有頻率有所升高女人被男人桶到高潮视频免费，徑向振動幅頻特性的幅值升高，而軸向和角向降低中韩欧美视频二区；鋼球的數(shù)量增多使球軸承振動的固有頻率上升日韩一级片免费视频，幅頻特性的幅值下降，徑向振動的幅值下降最為明顯欧美性交一级大片；外圈溝曲率半徑系數(shù)增大使球軸承徑向振動的固有頻率升高国产欧美视频图片小说区，軸向和角振動的固有頻率降低，徑向幅頻特性基本不變，軸向和角向幅頻特性幅值升高国产巨乳无码精品中文字幕在线观看；內(nèi)圈溝曲率半徑系數(shù)增大使徑向毛片在线视频免费观看下载大全、軸向和角振動固有頻率均下降，振動幅頻特性的幅值均有升高黑人α片； 8試驗對比表明国产日韩区，傳感器采用探針式安裝時，由于探針接觸副接觸特性的影響黄色视频啪啪一区，鋇(量得到的球軸承振動信號有失真一级视频片免费播放，采用專門設(shè)計和制作的試驗球軸承，以固定式安裝加速度計www.国产精品久久久久久，首次測量得到了球軸承振動的真實信號亚洲不卡视频在线播放，通過對振動信號的分析，驗證了球軸承振動的理論模型日韩孕妇自拍视频直播在线观看网站； 9)基于時間序列分析的AR模型適用于大樣本球軸承振動信號的分析美女被c视频，以樣本長度的均方根值作定階上界，F(xiàn)PE做判階準(zhǔn)則欧美男免费A片视频，給出的AR譜光滑JIZZ中国国产在线，頻率分辨率高，是球軸承振動分析的簡便而可靠的手段国产精品盗摄盗拍最新视频； 10以時頻域分析的小波包變換分析球軸承異音信號能夠比較好地定位和聚焦異音發(fā)生的時間人妖系列，時間間隔，頻率范圍人人操人人操人人人干，同樣是球軸承振動分析的可靠的手段在线色网站，可用作球軸承故障診斷技術(shù)。

The derivatives of the nonsmooth equations are computed to make the generalized derivative matrix nonsingular. Then the nonsmmoth damped Newton method is used to solve them.Analytic solutions of the KdV equation with variable coefficients: Shallow water wave problems belong to problems of free surface wave, and can be molded by the nonsmooth equations model given above in principle.

在前面建立的非光滑方程組數(shù)學(xué)模型和固定網(wǎng)格法基礎(chǔ)上伊人一级得黄片，利用廣義導(dǎo)數(shù)的概念給出了求解滲流自由面的一種新方法-----非光滑阻尼牛頓法国产日日操夜夜操，該法是對非光滑方程組求導(dǎo)，適當(dāng)?shù)奶幚韽V義導(dǎo)數(shù)矩陣使其非奇異黄色视频小说蜜臀在线观看，利用非光滑牛頓法求解人人操人人干综合网。

It is so smooth and glides on with a luminous look to it.

它是，因此使光滑和滑翔與光亮神色對它2022国产激情视频在线观看看。

The juices from the meats or vegetables result in a caramelized glaze which add depth to the flavor of the food.

裝玻璃国产精品视频你懂的97，/上釉于，上光国内精品久久久久久久久久，使光滑人人肏人人干人人肏，使光亮，/變得呆滯無神榴莲视频下载ios下载；發(fā)呆

The results show that the concave structure ameliorates the surface stress distribution of the non-smooth sample, makes the local stress between concaves less apparently than that of the smooth sample, that means the local low stress areas are formed on the non-smooth surface.

結(jié)果表明：在受力狀態(tài)下，仿生非光滑凹坑改善了試樣表面的應(yīng)力分布，使非光滑試樣表面凹坑間的區(qū)域局部應(yīng)力明顯小于光滑試樣表面的應(yīng)力日黄a天堂，即產(chǎn)生了局部低應(yīng)力區(qū)网站在线观看视频免黄。

The results show that the concave structure ameliorates the surface stress distribution of the nonsmooth sample,makes the local stress between concaves less apparently than that of the smooth sample,that means the local low stress areas are formed on the nonsmooth surface.

結(jié)果表明：在受力狀態(tài)下，仿生非光滑凹坑改善了試樣表面的應(yīng)力分布18岁以下禁止观看的黄视频，使非光滑試樣表面凹坑間的區(qū)域局部應(yīng)力明顯小于光滑試樣表面的應(yīng)力人操人操人操人操人操人操人操，即產(chǎn)生了局部低應(yīng)力區(qū)。

Each of the elevated temperature curves is moved along the horizontal time axis to longer times until it superposes on the reference temperature curve as smoothly as possible and then the master creep curve is obtained.

沿時間軸水平移動非參考溫度下的蠕變曲線段使之與參考溫度下的曲線圖光滑連接国产性交视屏，形成一條光滑的主曲線圖国产嫖娼妓院视频网站。

Make(one's hair,a cat 's fur,etc)sleek

使光滑而發(fā)亮。

The major works are as follows: 1 The 3-D numerical model of U-sharp flow passages is set up. The single-phase fluid flow and heat transfer are simulated for the U-sharp smooth and rib-roughened flow passages with FLUENT software. Their performance curves, temperature field and velocity vector are obtained and the local heat transfer and flow pressure-drop distribution along flow passage are analyzed. It is revealed that the ribbed flow passages can enhance heat-transfer and make the temperature more uniform, but it increases the pressure-drop to more extent. 2 The influences of diaphragm depth, channel width and board spacing on the performance are investigated.

建立了層疊式蒸發(fā)器U形流道的3維湍流模型欧美第一黄站视频，用FLUENT軟件對尺寸相同的U形光滑流道和肋化流道中單相流體的傳熱和流動進(jìn)行了數(shù)值模擬中日欧美野外日一级黄色A片在线日，得到了兩種流道的傳熱和阻力性能關(guān)系曲線及速度矢量圖、溫度場国内精品久久久久影院网站，分析了光滑流道和肋化流道的局部換熱系數(shù)及沿程壓降變化国产精品美女AV，結(jié)果表明流道的肋化能有效的增強(qiáng)傳熱，而且使流體的流動和傳熱更加均勻中文字幕黄网，但也較大地增大了阻力99精品视频网址。

In this part, the set of CODONs is extended so that both open and closed curves containing straight lines and cusps can be completely represented.

該部分研究主要將傳統(tǒng)的基于封閉光滑輪廓的CODON編碼推廣至任意非封閉非光滑曲線，使圖像的CODON編碼能更加完備地表征圖像輪廓欧美一级A片免费观看免费图片儿。。