Method and system for calculating passive rotating speed of special equipment

The invention provides a method and a system for calculating the passive rotating speed of special equipment. According to the method, the difference of the rotating frequency and interference components of rotating equipment at different positions of a mechanical body is filtered, multi-channel vibration data with richer information amount can be combined to serve as input parameters, accordingly, ircoherent frequency components in a single channel are eliminated, an improved second-order statistic blind source separation and Vold-Kalman filtering method is adopted, and the multi-channel vibration data can be combined to serve as the input parameters. The number of sources to be separated can be automatically determined, multi-time delay input can be optimized, and the instantaneous rotating speed of the special equipment can be accurately identified. According to the scheme provided by the invention, the instantaneous rotating speed can be accurately estimated in a complex environment, such as adjacent chan