流體引起的振動ppt課件(編輯修改稿)
2025-05-28 06:33 本頁面
【文章內(nèi)容簡介】 SKF Slide 10 [Code] SKF [Organisation] Typical Spectrum of Cavitation amp。 Starvation 典型的氣蝕 /抽空頻譜 20220529 169。SKF Slide 11 [Code] SKF [Organisation] Cavitation Characteristics 氣蝕特點 1. Classic spectra indicating cavitation have random, broad band energy most often between approximately 20,000 CPM up through approximately 120,000 CPM. 通常在 300Hz至 2,000Hz的頻率范圍內(nèi)有隨機寬帶的振動。 2. When cavitation occurs it will increase ultrasonic measurements (spike energy, HFD, shock pulse, etc.). 氣蝕會引起超聲能量的上升，可用 SKF加速度包絡(luò)檢測。 20220529 169。SKF Slide 12 [Code] SKF [Organisation] Cavitation Characteristics 氣蝕特點 3. Cavitation will most often generate unique noise. Milder cavitation normally sounds like sand being pumped whereas more severe cavitation will actually sound as if gravel is being passed through the pump. 氣蝕通常會產(chǎn)生很奇特的現(xiàn)場噪聲。中等程度的氣蝕產(chǎn)生的噪聲象沙子在泵中流動，而嚴重的氣蝕產(chǎn)生的噪聲象小石子在泵中通過。 4. Starvation is the aerodynamic counterpart to cavitation. Like cavitation, it involves insufficient air flow relative to fan capacity. Typical starvation spectra are almost identical to those of cavitation. 抽空與氣蝕差不多一樣，只不過它是風(fēng)機的問題。典型的抽空頻譜與氣蝕頻譜幾乎完全一樣。 20220529 169。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。泵輸送量太小或入口壓力太高時，泵會發(fā)生回流現(xiàn)象。 When it occurs, a portion of the fluid returns from the discharge to the impeller as the pump attempts to move an excessive amount of fluid through the pump. This brings about a reverse flow and results in 2 or more fluids moving in opposite directions causing noise and vibration. 回流發(fā)生時，一部分流體會從出口回流到葉輪中，因為泵實際上在輸送過多的流體。這樣會引起反向的液流。兩個或多個反向的液流會引起噪聲和振動。 20220529 169。SKF Slide 14 [Code] SKF [Organisation] Recirculation Characteristics 回流特點 1. Recirculation generates vibration spectra very similar to those caused by cavitation. That is, it will often have random, hi
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號-1