Correlation of Centrifugal Pump Vibration to Unsteady Flow Under Variable Motor Speed
Correlation of Centrifugal Pump Vibration to Unsteady Flow Under Variable Motor Speed
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DOI：
10.1051/meca/2014051
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发表时间：
2014
影响因子：
1.2
通讯作者：
J. Mele;A. Guzzomi;J. Pan
中科院分区：
文献类型：
--
作者：
J. Mele;A. Guzzomi;J. Pan
虽然离心泵轴承的状态监测来推断故障是常见的做法，泵的振动水平和内部的不稳定流之间的关系还没有得到广泛的研究。然而，后者可能为泵设计的进一步发展提供基础，以提高性能，先进的预测性维护计划和振动监测技术，可以允许推断泵的效率状态。本文研究了在不同电机转速下，泵的振动与非定常流动之间的相关性。采用了试验台和数值计算流体力学模型。结果发现，流致振动一般随泵速的增加而增加，并且与泵效率明显相关。因此，如果效率曲线是先验已知的，那么似乎可以构建一个模型来从泵的压力和振动水平推断泵的效率。然而，由于振动水平也取决于系统的结构固有频率和模式，因此在某些情况下似乎也需要了解这些知识。这项工作证实，在较低的泵速下使用变速泵允许与设计BEP有更大的偏差，而不会危及泵的安全性，应考虑用于工业用途。
Although condition monitoring of centrifugal pump bearings to infer faults is common practice, the relationship between a pump’s vibration level and the unsteady flow within has not been extensively researched. The latter, however potentially provides the foundations for further developments in, pump design to increase performance, advanced predictive maintenance programs and, vibration monitoring techniques that can permit inference of pump efficiency states. This paper investigates the correlation between pump vibration and unsteady flow at different motor speeds. A test rig and a numerical CFD model were employed. It was found that flow-induced vibration in general increases with pump speed and was clearly linked to pump efficiency. It therefore seems possible to construct a model to deduce a pump’s efficiency from its pressure and vibration levels, if the efficiency curve is known a priori . However, as the vibration levels are also dependent on the system’s structural natural frequencies and modes, it seems that knowledge of these may also be needed in some instances. The work confirms that utilising a variable speed pump at lower pump speeds allows greater deviations from the design BEP without jeopardising the safety of the pump and should be considered for industrial use.