Method for diagnosing early weak fault signal features of marine machinery

Abstract

The invention relates to a method for diagnosing early weak fault signal features of marine machinery, and discloses a method for extracting and diagnosing stochastic resonance weak features of a variable-scale plastic monostable structure. The monostable well depth, the well radius and the steep degree of the potential well wall are used as potential structure feature parameters, the stochastic resonance model of the plastic potential structure is finely constructed, matching of the potential structure and fault features is guaranteed, and the weak fault feature enhancement extraction capability is improved; then, multi-parameter objective function optimization based on weighted kurtosis indexes is designed to carry out enhanced extraction on the fault features of the ship mechanical equipment, and a reliable basis is provided for diagnosis of early weak fault features of the ship machinery; and the application defects of instability of transition between particle traps and limitation of small parameters are overcome, effective fault diagnosis and qualitative analysis of ship mechanical equipment are achieved, and even under strong noise interference, larger weighted kurtosis and higher characteristic frequency spectrum peaks are still obtained.

Description

technical field [0001] The invention belongs to the field of equipment fault signal diagnosis, and in particular relates to a method for diagnosing characteristics of early weak fault signals of ship machinery. Background technique [0002] The complexity and enlargement of marine machinery and equipment have brought about an increase in the number of parts, coupled with the harsh and changeable working environment, resulting in damage to tiny rotating parts that triggers an impact response. The weak fault signal not only means that the amplitude of the signal is very small, but more importantly, it means that the amplitude of the useful signal is very weak relative to the background noise. The complex rigid transmission structure and transmission path from the weak fault source to the collection point of the marine machinery equipment, the mutual coupling of the excitation and response of each component vibration source and the multi-scale noise weaken the fault characteris...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of enhanced detection of weak fault features of ship equipment in a strong noise environment and improve the performance of early weak fault feature extraction of ship machinery, the present invention provides a feature diagnosis method for early weak fault signals of ship machinery

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