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Diesel generators are one of the mostcommon used energy sources for maintaining the continuity of electrical energy. Diesel generators cause high noises during their operation. There are manymethods of eliminating the noise problems that diesel generators generateduring energy production. However, these methods show differences according tothe type of noise source. In this study, the problem of noise was emphasizedthat it is caused by structural vibrations of diesel generators. Therefore, themethod of coherence function, which is an analytical method, was used for thedetection of noise caused by structural vibrations. A test software and userinterface was developed to perform sound and vibration measurement and analysiswith using coherence function. The coherence analysis of sound and vibrationdata was made by performing various tests and measurements with the developedtest software. In the coherence tests of diesel generator, the vibrationfrequencies that cause high noise at the measurement points were determined. Inorder to verify the coherence tests, the computer-aided 3D solid model ofdiesel generator used in the tests was created. Computer-aided modal analysisof the diesel generator was performed by using this model. The modal analysiswas performed at the vibration measurement points and the frequencies thatcause high noise. Coherence test results and modal analysis results werecompared. It was seen that the results of the coherence measurement and theresults of the computer-aided modal analysis supported each other. As a resultof these studies, it was shown by computer-aided modal analysis that the highnoise occurring in diesel generators can be determined by the coherence tests.
Cite this article as: Ölmez U, Bayhan N,Doğan H, Uysal M. Detection of Structural Vibration-Induced Noises with ModalAnalysis in Diesel Generators. Electrica, 2019; 19(1): 72-84.