Experiment on vibration characteristics of double-suction centrifugal pump under multiple working conditions
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摘要: 为研究某双吸离心泵在不同工况下的振动特性,采用LMS Test.Lab测试系统对该离心泵机组进行不同工况下的壳振测试和轴振测试.共测试了该泵在5个流量工况点和5个转速下的壳振、轴振和轴心轨迹,并通过数据处理得到其壳振、轴振随流量和转速变化的频谱图.试验结果表明:壳振振动烈度随流量的增大呈现出波动,而随转速的增大整体上呈上升趋势,不同测点、不同方向的壳振大小和变化趋势不同;轴振位移峰值随流量和转速的增大而增大,但并非是线性增大;不同测点、不同方向的壳振频谱图呈现差异,显示存在较多的流致振动;轴振随流量、转速变化的趋势在相互垂直的2个方向上表现相近;流量、转速的变化对轴心轨迹有比较明显的影响.Abstract: To investigate the vibration characteristics of a double-suction centrifugal pump under different working conditions, the shell vibration test and the shaft vibration test of the centrifugal pump unit under different working conditions were carried out by LMS Test.Lab test system. The shell vibration, the shaft vibration and the axis trajectory of the pump were tested at 5 flow points and 5 rotating speeds. The frequency spectrum of the shell vibration and shaft vibration changed with flow rate and rotating speed was obtained by data processing. The experimental results show that the vibration intensity of shell vibration is fluctuated with the increasing of flow rate and is increased with the increasing of rotational speed. The size and variation trend of shell vibration are different at different measuring points and in different directions. The peak displacement of axial vibration is nonlinearly increased with the increasings of flow rate and rotation speed. The shell vibration spectra of different measuring points and directions are different, which indicates that there are much fluid-induced vibration. The trends of axial vibration with flow rate and rotation speed are similar in the two mutually perpendicular directions. The changes of flow rate and rotation speed have obvious influence on the axis trajectory.
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