Problems of hydraulic machine evaluation according to the tests results

Computer simulation of hydroelectric units is impossible without calculating vibrations of their assemblies. The permissible oscillations are determined by the norms. The existing norms do not meet modern requirements. In the article there are presented problems of evaluating test results according to the existing norms. Firstly,the operating frequency band of the sensor on the vibro-displacement parameter does not cover the frequency range 0.1-200 Hz. There is no such vibrating sensor. We cannot get technically a complete picture of the vibration state of the hydraulic unit and according to the norms determine its evaluation. Therefore, the frequency band 0.1-2 Hz is proposed to be monitored separately by pressure pulsation sensors. The norms of permissible pulsations are required for this procedure.Secondly, the sensor resonance is in the frequency band of the structure. Thirdly, the frequency band to be monitored is not specified in the norms. Possible errors in estimating oscillations are revealed in the article. (paper)