Abstract: The of the blade faults diagnostic method is presented which be named the blade-to-blade dynamic space diagnostic method. It uses the pulse sensors amounted on the shell to non-contact measure the pulse signal generated by the rotating blade when it pass before the sensors. Through calculating the relative time intervals or absolute time intervals between two blades, blades vibration and fault information can be gained. At the same time, the can ception of rigid blade and flexible blade are presented. The influence made by blade vibration on the dynamic space is analysed. At last, the principle of experimental research and process of this way are discussed. The experiments and practice application have revealed that the diagnostic method is correct and effective.

Key words: Fault diagnosis, Rigid blade, Blade-to-blade dynamic space, Flexible blade, Turbo machinery