流體引起的振動ppt課件(已修改)
2025-05-13 06:33 本頁面
【正文】 20220529 169。SKF Slide 1 [Code] SKF [Organisation] FlowInduced Vibration 流體引起的振動 20220529 169。SKF Slide 2 [Code] SKF [Organisation] FlowInduced Vibration 流體引起的振動 Unlike many of the other mechanical vibration problems such as unbalance, misalignment, resonance and so forth, flowinduced vibration is often very dependent upon operating conditions. That is, it can be very affected by load depending on the type of machine and the work being performed by the machine. 與不平衡、不對中和共振等許多問題不同，流體引起的振動往往與設(shè)備的工藝運行狀態(tài)密切相關(guān)。這就是說，依照設(shè)備類型的不同，設(shè)備的負(fù)荷以及設(shè)備承擔(dān)的工藝角色對振動的影響會很大。 20220529 169。SKF Slide 3 [Code] SKF [Organisation] Flow Relevant Faults 流體相關(guān)故障 Flowinduced vibration includes each of the following: ? Hydraulic and Aerodynamic Forces ? Cavitation and Starvation ? Recirculation ? Flow Turbulence ? Surge ? Choking 流體引起的振動包括以下幾種情況： 流體動力 氣蝕和抽空 回流 紊流 喘振 流體堵塞 20220529 169。SKF Slide 4 [Code] SKF [Organisation] Hydraulic and Aerodynamic Forces 流體動力 Various types of machines including pumps, blowers, turbines, vacuum pumps and so forth inherently produce hydraulic or aerodynamic forces as their impellers impart work on the fluid (liquid or gaseous) they are handling. In general, hydraulic and aerodynamic forces are generated as per the following equation: Blade (or Vane) Pass Frequency = BPF = Vanes X Impeller RPM (CPM or Hz) 很多類別的設(shè)備，包括泵、風(fēng)機、透平機、真空泵等等，均會不可避免地因為它們的葉片作用在輸送的流體（液體或氣體）上而產(chǎn)生流體動力。 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。SKF Slide 5 [Code] SKF [Organisation] Blade amp。 Vane Pass Freq 葉片通過頻率 20220529 169。SKF Slide 6 [Code] SKF [Organisation] Hydraulic amp。 aerodynamic force vibration 流體動力振動的特點 1. Significant vibration both at blade pass frequency and blade pass harmonics will be generated if an impeller is not centrally located within its housing and properly aligned with diffusers. 若葉輪在機殼中偏心或相對于蝸殼的位置不正確，會產(chǎn)生較大的 BPF及其倍頻的振動。 2. It is important to ensure that neither the blade pa
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