Blind source separation method for noise reduction of vibration signals of solid rocket engine

Abstract

The invention provides a blind source separation method for noise reduction of vibration signals of a solid rocket engine. The number of source signals in acquired mixed signals under the condition that the source signals are unknown is distinguished according to an AIC criterion, and independent vibration source feature information is acquired from the mixed signals through observation signals ofa sensor according to a FastICA algorithm obtained after a learning function is improved. The problem about noise reduction of the vibration source signals under the condition that environments and equipment are complex is solved, compared with filtering and other traditional methods, the method better conforms to the solid engine test condition, useful source signals are not filtered out, the manual analysis error possibility is eliminated, the beneficial effects of intelligence, universality, adaptability and the like are achieved, two or more mixed mechanical vibration signals can be wellseparated, the purpose of noise reduction is achieved, the method can be applied to multiple engine test occasions, better parameter indexes are provided for engine designers, and the engine ground test requirements are met.

Description

technical field [0001] The invention belongs to the technical field of solid rocket motor test measurement and control, and mainly relates to a blind source separation method that can be used for noise reduction processing of vibration signals in solid rocket motor tests. Background technique [0002] One of the main purposes of solid rocket motor testing is to obtain the data of various parameters of the engine, because these data can verify the engine design theory, which is an important basis for studying the working performance of the engine, but the interference of various unfavorable factors cannot be avoided during the measurement process. As a result, the measurement data contains a lot of useless information (noise), which makes the measurement data seriously "polluted", and brings many adverse effects to the performance judgment, fault detection and state monitoring of the solid engine. Therefore, it is necessary to study the data processing method of the solid eng...

AI Technical Summary

Problems solved by technology

[0007] For this reason, the present invention proposes a blind source separation method for noise reduction of vibration signals of solid rocket motors, which solves the problem of noise reduction of vibration source signals in complex environments and equipment. Obtain independent vibration source characteristic information, provide engine designers with better parameter indicators, and fully understand the performance of the engine

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