Detection of Cavitation with Accelerometer Mounted on Outer Surface of Piping

Autor:	Michio Murase, Yuzo Fujii, Shigeo Mizuyama, Yoshinori Yagi
Rok vydání:	2008
Předmět:	Piping Materials science business.industry Mechanical Engineering Acoustics Structural engineering Accelerometer Industrial and Manufacturing Engineering Vibration Root mean square Amplitude Mechanics of Materials Cavitation business Body orifice Voltage
Zdroj:	TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C. 74:1681-1687
ISSN:	1884-8354 0387-5024
DOI:	10.1299/kikaic.74.1681
Popis:	Cavitation induced vibration and erosion of pipes are the potential damaging factor in a piping system. To prevent such trouble, it is necessary to develop the detection method of cavitation phenomena. Especially, in power plants, it is preferred to detect them from the outside of piping during operation. In this paper, detection of cavitation phenomena was experimentally investigated using accelerometers mounted on the outer surface of piping at upstream and downstream of an orifice. As the results : (1) According to the progress of cavitation, output voltage of the accelerometer varied, and the amplitude and number of the pulse-shaped signals increased. However, it might be difficult to distinguish them from noises in an operating plant. (2) It was difficult to recognize the characteristic frequency of cavitation, because the power spectrum density was broad up to the accelerometer limit of 45 kHz. (3) The flow directional distribution of RMS (root mean square) values of accelerometer outputs varied greatly according to the progress of cavitation. Therefore, comparison of RMS values at upstream and downstream of the orifice might be possible to detect cavitation phenomena in a piping system of operating plants.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dbd61850e7b9f2ab47da353cb9ee430c https://doi.org/10.1299/kikaic.74.1681 Zobrazit plný text záznamu