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* This paper established fluid-structure interaction-based water flow ALGOR numerical model of pressure pipeline in a pump station; meanwhile, DASP vibration test system is adopted to acquire the vibration signals to verify the simulation results, analyze the incentive characteristics of pressure pipeline flow formed on pipeline vibration and put forward an optimized design scheme.
ALGOR numerical model, modal analysis, optimization scheme, pressure pipeline, pump stations, vibrations
INTRODUCTION
Pipelines at high-lift pumping stations may exhibit vibrations arising from high-pressure water delivery, significantly degrading operational safety and pumping station structural service life. Such pressure pipelines are typically composed of concrete or steel pipes. Altered pipe size or elbow layout could restrict water flow, causing flow rate and pressure intensity variations. In turn, unsteady flow could further expose the pipeline to the fluid's dynamic pressure, causing pipeline vibrations. Not only can this damage a pressure pipeline, but it also increases its resistance loss, decreasing water delivery efficiency and increasing energy consumption in irrigation pumping (Madzivire et al. 2019).
The pipeline vibration problem has been studied by scholars worldwide over many years, yielding significant progress. In the 1970s, this research achieved a breakthrough and entered a practical stage with the help of computers (Bu 2006). Among studies of nonlinear vibration in fluid-conveying pipelines, Jin and Zou (Jin 1997; Jin & Zou 2003) found that large flow velocity and small elastic support stiffness may result in fluttering, dynamic instability, and even chaotic motion of a cantilever DC pipeline. In a gas–liquid two-phase flow pipeline system, the exciting force often occurs at fluid turning points such as bends, elbows, and T-joints (Wang 2006; Zeng 2007). Hara (1975, 1980) studied pipeline vibration caused by two-phase flow, derived the equation of motion for free vibration of two-phase flow pipelines, and pointed out that pipeline vibration is mainly caused by the centrifugal force and changes in the quality of the vibrating system. Keramat et al. (Keramat & Ahmadi 2012; Keramat et al. 2012; Zanganeh et al. 2015) theoretically and experimentally analyzed pipeline vibration and studied fluid–structure interaction with viscoelastic supports under the action of water hammer. Ahmadi & Keramat (2010) explored the node-coupling effect using finite-element-based structural and hydraulic equations to study water hammer with fluid-structure interactions. Many of the above-mentioned studies are...