69 results about "Variational model" patented technology

The invention discloses a fault diagnosis method under the action of a central frequency convergence trend. The method comprises the following steps: (1) collecting a dynamic signal x (t) of rotary mechanical equipment; (2) setting initial decomposition parameters of the variational model; (3) decomposing the dynamic signal x (t) by using a variational model with set initial decomposition parameters, and traversing the signal analysis frequency band under the guidance of a central frequency convergence trend to iteratively decompose the dynamic signal x (t) to obtain an optimized mode {m1... Mn... MN} and a corresponding central frequency {omega1... Omegan... OmegaN}; (4) searching a fault correlation mode mI, guiding parameter optimization by the central frequency omega I of the fault correlation mode mI, and extracting an optimal target component containing fault information; and (5) performing envelope analysis on the optimal target component, and diagnosing the rotating mechanicalequipment according to an envelope spectrum. According to the fault diagnosis method provided by the invention, intelligent decomposition of the original dynamic signal of the diagnosis target equipment is realized by adopting a decomposition mode guided by a central frequency convergence trend, the acquired equipment dynamic signal can be adaptively analyzed, and the difficulty of performing mechanical fault diagnosis by a technician by using a variational mode decomposition method is reduced.