All-band characteristic prewarning method for mechanical vibration signal

Abstract

The invention discloses an early-warning method for mechanical vibration signal full frequency band characteristic, including acquisition multiple sets of the mechanical vibration signals, calculation of components of each weight of the vibration signals, and obtainment of a plurality of sets of vibration amplitudes and frequency value sequence sets, namely, for specific fi frequency, a plurality of sets of vibration amplitudes can be obtained, an amplitude early-warning value for the specific fi frequency can be obtained by calculating average value, deviation value of the plurality of sets of vibration amplitudes; for the plurality of sets of fi frequencies, an early-warning line for the mechanical vibration signal full frequency band characteristic is drawn on an original vibration signal spectrogram by manufacturing the spectrogram, in order to determine early warning for the mechanical vibration signal full frequency band characteristic. Hence, the method can realize early warning for the mechanical vibration signal full frequency band characteristic even when certain frequency component vibration amplitude exceeds standard to early warn.

Description

technical field [0001] The invention relates to a method for monitoring and diagnosing mechanical states, in particular to a method for early warning of full frequency band characteristics of mechanical vibration signals. Background technique [0002] In the mechanical field, according to statistics, 60% to 70% of mechanical failures are reflected by vibration and noise with vibration radiation. Therefore, compared with other mechanical equipment condition monitoring technologies, vibration monitoring and diagnosis are simple and easy. The measured vibration level is often used to judge whether the vibration is within the allowable range and at which level. [0003] To judge whether there is a fault in the mechanical equipment and the extent of the fault, it is necessary to compare the measured value representing the state of the machine with the specified standard value. A large number of examples show that there is a special relationship between the vibration value and th...

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Problems solved by technology

[0010] 1. Although the vibration amplitude of a certain frequency component in the vibration signal may exceed the acceptable range, the total vibration value does not exceed the standard, so it is impossible to warn in time, resulting in missed reports, and is not sensitive to early failures

[0011] 2. Even if the total vibration exceeds the standard, it is impossible to know which specific frequency component amplitude exceeds the standard, and the lack of diagnostic information makes it impossible to accurately locate the fault location and cause

[0012] 3. The original warning belongs to the single-value warning of the total vibration of the whole spectrum, and it is impossible to realize the warning of any point in the full frequency band of the vibration signal or set countless points of warning

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