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沉沒輥裝置液固耦合數值模擬及振動實驗

Numerical simulation and vibration test on the liquid-solid coupling system of a sink roll device

  • 摘要: 針對熱鍍鋅線沉沒輥裝置出現劇烈振動的問題,基于濕模態的結構非完全液固耦合方法,數值模擬了裝置在鋅液中的振動模態,分析各階振型及固有頻率,并進行現場振動實驗.鋅液中沉沒輥的局部振型改變軸承的裝配關系,而在實測信號的時域波形中出現削波現象,表明鋅液中滑動軸承存在碰摩;幅值譜中波峰對應的頻率為45.05 Hz,與濕模態的第4階固有頻率接近且振型相似,表明實驗中的裝置主要以第4階固有振動為主;液固耦合的非線性振動引起倍頻振動;鋅液流場的持續作用是導致幅值譜中波峰兩側出現邊頻帶的主要原因.理論及數值分析與實驗研究有顯著的關聯性,結構非完全液固耦合方法能有效應用于工程實踐.

     

    Abstract: For violent vibration of the sink roll device of a hot-dip galvanizing line, an incomplete liquid-solid coupling method based on the wet modal was studied, the vibration modal of the device was numerically simulated, the natural frequencies and vibration modes were discussed, and the vibration test was performed. The partial mode of the sink roll changed the assembly relationship in bearings, and the clipping appeared in the time domain waveform of measured signals, indicating that crashing and friction existed in the sliding bearings. The frequency of the peak in the amplitude spectrum was 45.05 Hz, close to the fourth order frequency and mode, which showed that the fourth order natural vibration of the device was dominant. The double-frequency vibration was caused by nonlinear vibration of liquid-solid coupling. The main cause of sidebands near the peak in the amplitude spectrum came from the continuous action of the zinc liquid flow field. The numerical analysis and experimented research have significant correlation, and the incomplete solid-liquid coupling method can be effectively applied to engineering practice.

     

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