CAO Deng-feng, PAN Luo-ping, ZHOU Ye, XIA Wei

China Institute of Water Resources and Hydropower Research, Beijing 100038, China

Abstract: The vibration state is one of the main indicators characterizing the operation stability of hydropower unit. A non-dimensional parameter which reflects the relationship between dynamic and static loads is put forward, based on study on vibration performance on load frame of similar unit taking Francis units for example. Relative power consumption caused by the vibration which results from hydraulic factors is constant for similar units. Based on this assumption, a regression model between the vibration parameter and unit speed is finally established with the least square method. The range of vibration is divided into several different areas under different confidences to evaluate vibration state, and countermeasures are proposed. It turns out that it is an effective and feasible method for evaluating vibration state on load frame of Francis units.

Key words: Francis unit, vibration of load frame, vibration modeling, the least square method, evaluation of vibration state

Published in: Journal of China Institute of Water Resources and Hydropower Research (Vol. 12 No. 3, 2014)