There are over than 1500 irrigation and drainage pumping stations in Egypt operating under different conditions. These pumping stations are encountered to many problems. The safe working of these stations verifies the operation function and keeps the cultivated land away from the problems of misdistribution of irrigation water and the high subsurface water levels. Vibration is the most serious problem that encountered these pumping stations. There are many causes of vibration in pumping stations include mechanical, hydraulic, thermal, bad maintenance, operation, and environmental source. The subsequent effects are energy losses, reduction in performance, decrease operating life, wear, fatigue, and failure. Damage due to vibration causes millions of dollars in Egyptian water distribution systems for maintenance and replacement costs. An experimental modal analysis was performed for an empty pumping system and for full fluid filled pumping system at different levels of water in the suction sump to simulate the real operation stage in dynamic The dynamics of the system structure as well as that of the fluid enclosed, and the fluid structural coupling have a major effect on the system dynamics. The main objective of this research is to eliminate or reduce the structural and mechanical damage in the pumping stations due to mechanical vibrations. Laboratory measurement are conducted on a physical model of a pumping unit using modal testing technique to determine the system's dynamic structural characteristics.
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