Abstract: De-noising the vibration signal of rotating machinery realized based on mathematical morphology. New noise reduction technique based on open-closing and close-opening combined morphological filters proposed. The ability of morphological filter deals with different types of noise discussed. The method of FT combined morphological filter also proposeds to reduce intensity noise. Simulation and experiment example demonstrate the effectiveness of the algorithm. It is effective to filter the noises in vibration signal and improve S/N ratio prominently. The algorithm is fast and propitious to engineering.

Key words: Filter, Mathematical morphology, Nois, Rotating machinery, Vibration, butt joint gap, heat source angle, power cooperation, shielding gas, titanium alloy sheet