APPLICATION OF COMPUTER CONTROL AND CLOSED LOOP CONTROL TECHNIQUE TO VIBRATION FATIGUE TEST

Load, frequency and cycle number are three key parameters of a vibration fatigue test. It is hoped that they are stable and can be adjusted steplessly. In this paper, computer control and closed loop control technique are introduced to form a new blade vibration fatigue experiment system, in which parameters control, data collection and processing, system alarming and test termination could be realized automatically. The system improves the measurement accuracy and the reliability of test. Test of thousands blades indicate that the system is feasible, measurement accuracy is satisfied and the process of experiment is stabilized.