Foreign Object Impact Detection and Identification Test of Fan Blade

In order to master the detection and identification technology of foreign object impact on fan blade on noninterference blade tip vibration measurement, fan blade test platform for detection and identification of foreign object impact was designed and built. Lots of experiments were carried out under different working conditions such as projectile mass, launching speed and fan speed. The criterion of foreign object impact identification was preliminarily given before the identification results were verified through high speed camera. The difference of the recognition accuracy under different projectile mass and rotating speed conditions, and qualitative rule between impact factors and blade tip vibration was analyzed. It is concluded that the detection and identification system could accurately determine the impact event with the number of impact blade. The identification accuracy of the system reaches 100% under the conditions of fan speed in the range of $ 1800\sim 4000r/min$ and the mass of the projectile greater than 2.9 g. The conclusions provide important test data and basis for establishing intelligent detection and identification methods for foreign object impact.