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The title CuII complex, [CuBr2(C21H15N3)]·0.5H2O, was obtained by the hydro­thermal reaction of copper(II) bromide, 4′-phenyl-2,2′:6′,2′′-terpyridyl (4′-Ph-terpy or L) and sodium citrate in water in 31% yield. There are two unique complex mol­ecules and a water mol­ecule in the asymmetric unit. The CuII cation is ligated by three N atoms of L and two bromide anions, forming an irregular CuN3Br2 polyhedron with a distorted square-pyramidal coordination geometry. In the crystal structure, O—H⋯Br hydrogen bonds link the mol­ecules in a three-dimensional network.

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For operating giant hydro generator units, those who adopt flexible supports, there are horizontal low frequency vibration problems in varying degrees on stators. A hazard to the stator is mainly manifested in fatigue damage. To analysis and evaluate the fatigue damage of this low frequency vibration on stators, one unit was selected for this research, whose vibration and run-out was larger. First, modal analysis of the stator was conducted, and the results showed that the low frequency vibration cannot cause the resonance of the stator. Then, based on the calculated model of unbalanced magnetic pull, the magnitude of the unbalance magnetic pull was calculated. Finally, this paper mainly focus on the amplitude and the stress of stator under unbalanced magnetic pull. The results showed that low frequency vibration could not cause fatigue damage to the stator.