Blade tip vibration velocity calculation method based on forced fitting pulse signal

The invention discloses a blade tip vibration velocity calculation method based on a forced fitting pulse signal, and the method comprises the following steps: 1, obtaining a pulse signal waveform when a blade tip sweeps a sensor at a proper sampling frequency; and step 2, estimating the rotation speed of the blade tip according to the pulse signals of different circles. And step 3, establishing a linear polynomial mathematical model, and obtaining the blade tip vibration velocity by using a nonlinear fitting method. And step 4, removing a trend term in the blade tip vibration speed by using an empirical mode decomposition technology so as to obtain a more accurate blade tip vibration speed. The method provided by the invention is proposed for the first time, and compared with a common method for calculating the vibration speed of the blade tip by adopting a plurality of adjacent sensors, the method provided by the invention has the advantages that the number of used sensors is small, the cost is low, and the