流體引起的振動ppt課件(完整版)
【正文】 slightly relative to the impeller. 若導(dǎo)葉片的焊接處發(fā)生失效，使擴(kuò)壓器相對葉輪產(chǎn)生輕微位移，它會導(dǎo)致BPF頻率處的振動大幅上升； 4. A great increase in blade pass vibration will be created if a pump impeller wear ring seizes to the shaft. 若泵口輪摩擦軸，會導(dǎo)致 BPF頻率振動的大幅上升； 5. Blade pass frequency in some particular fan types is particularly sensitive to damper settings. 對有些類型的風(fēng)機(jī)，其葉片通過頻率對阻尼設(shè)置情況非常敏感。 一般，流體動力的產(chǎn)生遵從下面的等式： 葉片通過頻率 ＝ BPF ＝ 葉片數(shù) x 葉輪轉(zhuǎn)速 （ cpm 或 Hz） 20220529 169。20220529 169。SKF Slide 5 [Code] SKF [Organisation] Blade amp。 20220529 169。SKF Slide 10 [Code] SKF [Organisation] Typical Spectrum of Cavitation amp。典型的抽空頻譜與氣蝕頻譜幾乎完全一樣。SKF Slide 14 [Code] SKF [Organisation] Recirculation Characteristics 回流特點(diǎn) 1. Recirculation generates vibration spectra very similar to those caused by cavitation. That is, it will often have random, higher frequency vibration, sometimes superimposed with vane pass frequencies. 回流頻譜與氣蝕頻譜非常相似，也有隨機(jī)寬帶振動，有時(shí)還有葉片通過頻率。SKF Slide 17 [Code] SKF [Organisation] Flow turbulence characteristics 紊流特點(diǎn) 1. Although flow turbulence can generate random, higher frequency vibration, it normally will cause random, lower frequency vibration below 1X RPM concentrated in a range from approximately 50 CPM up to 2022 CPM 雖然紊流會產(chǎn)生隨機(jī)的較高頻率的振動，它通常產(chǎn)生在 1xRPM以下頻率范圍內(nèi)地隨機(jī)振動，大約在 50CPM 至 2022CPM。當(dāng)喘振問題輕微時(shí)，僅葉輪葉片邊界層附近的氣流會改變方向。 20220529 169。當(dāng)出口壓力太低導(dǎo)致流體速度太高時(shí)，壓縮機(jī)會發(fā)生流體堵塞問題。壓縮機(jī)的喘振問題必須得到排除，因?yàn)樗鼤a(chǎn)生很大的破壞。 3. Sometimes noise produced by flow turbulence will be very high although the vibration acpanying it will be relatively low on the machine itself. The reason for this is that the turbulence condition itself exists outside the machine. 有時(shí)紊流引起的噪聲非常高而機(jī)器的振動卻相對較低，其原因是這時(shí)紊流發(fā)生在機(jī)器以外的管道中。然而，若回流引起的振動過高，會損壞軸承、磨損環(huán)、閥和其它相關(guān)部件。SKF Slide 13 [Code] SKF [Organisation] Recirculation 回流 In the case of a pump, recirculation is just the opposite of cavitation. Recirculation can occur when a pump is operated at too low a capacity or too high suction pressure. 對于泵來講，回流是與氣蝕相反的問題。SKF Slide 11 [Code] SKF [Organisation]
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