A Method for Early Fault Diagnosis of Complex Devices Based on Frequency Response Function and Operational Response Characteristics

Abstract

The invention discloses a method for diagnosing early faults of complex devices based on frequency response functions and operating response characteristics, and relates to the field of fault diagnosis of complex electromechanical systems. The specific steps are: primary selection of excitation and response test points for each frequency response function; Install multiple frequency response functions to find out the change of fault characteristics and optimize the best test point; set the signal sampling frequency according to the effective frequency range of the hammer excitation, respectively implement the on-site frequency response function and the test of the response characteristics of the operating state and correlate them. The correlation analysis is completed in the frequency domain, and the characteristic parameters of the time-frequency domain are given; the early fault classification and identification combined with the relative entropy and the deep learning network; the present invention can monitor and adjust the quality and performance in the complex device installation process-level operation, and find out early Quality and performance problems and hidden troubles, improve diagnostic accuracy; can be widely used in online diagnosis of early failures caused by performance degradation of main components of complex devices.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of complex electromechanical systems, in particular to a method for diagnosing early faults of complex devices based on frequency response functions and operating response characteristics. Background technique [0002] There are many types of complex electromechanical integration devices in engineering practice, including power and transmission devices in aircraft, ships, and tank vehicles, automatic bomb supply and delivery systems for artillery and other weapons, high-altitude unmanned reconnaissance aircraft systems, and satellite automatic deployment systems. , compressors, pumps and valve systems in petrochemical, electric power, nuclear power and chemical production, automatic profile rolling systems in steel manufacturing, and in complex electromechanical systems, there are both electric (hydraulic) power drives and specific tasks. Executing agencies, and complex transmissions in th...

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the deficiencies of directivity and faults that are not easy to be qualitative and quantitative in the existing monitoring and diagnosis technology, and provides a method for diagnosing early faults of complex devices based on frequency response function and operation response characteristics, and solves the problem of complex mechanical and electrical integration system performance Technical problems such as insufficient diagnostic accuracy in early diagnosis of deterioration and faults

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