Naslov
Spectrum normalization method in vibro-acoustical diagnostic measurements of hydroturbine cavitation

Autori
Bajić, Branko ; Keller, Andreas

Izvornik
Journal of fluids engineering : transactions of the ASME (0098-2202) 118 (1996), 4; 756-761

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
cavitation; erosion; hydroturbine; vibroacoustics; hydropower

Sažetak
Full-scale vibro-acoustical diagnostic measurements of cavitation in four Francis 6 MW double runner turbines were performed. Two types of sensors were used - a hydrophone sensing waterborne noise at the pressure side of a runner, and an accelerometer mounted at various points at the outer turbine casing, facing the runner’s pressure side. The correlation of noise and acceleration intensity with suction-side pressure fluctuations and runner position was checked. A simple but efficient method of spectrum normalization which rejects the influence of the measurement set characteristics and vibro-acoustical characteristics of a turbine was developed. The resulting spectra reveal the dependence of cavitation source strength on the turbine power as a function of noise or acceleration frequency.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA