Composite Flywheel Real-time Non-destructive Testing And Experimental Studies

In this paper, a new way of real-time damage detection method was proposed according to the high speed working situation of the composite flywheels for energy storage, and a suit of equipment was developed to test the composite samples with piezoelectric disc built-in, the response waves before and after the damage occurred were recorded to the computer. On the base of traditional spectrum analysis of signal recorded, the wavelet analysis was introduced and the program in Matlab language was made. With the wavelet packet decomposition of the signal, the relations between the change of response signals and damage characters were gotten, a database for damage recognition was created. The graph and eigenvector obtained from the decomposed signal can be used to determine the damage's existence and degree, and with the help of spectrum, the type of damages can be obtained. All the work will provide decision-making base for secure and intellectualized running of the flywheel. Further more, a Finite element analysis of flywheel rotor was made to increase the security of the flywheel's test, 9 modes Frequency were taken out according to the rotating speed of the flywheel, the results can act as the theory base for the structure design and tests of the flywheel.