A method for extracting acoustic characteristics of carbon fiber-reinforced aluminum-lined composite gas cylinders

Abstract

A method for extracting acoustic emission characteristic signals of a carbon fiber-reinforced aluminum-lined composite gas cylinder of the present invention comprises the following steps: performing spatial filtering on the acoustic emission signal, filtering the acoustic emission signal positioned at the mouth of the composite gas cylinder; and performing spatial filtering Perform amplitude filtering on the retained acoustic emission signals, and delete all signals not greater than 70dB; perform energy filtering on the acoustic emission signals retained by the amplitude filtering, and filter out signals with signal energy not greater than 100; the acoustic emission signals retained by energy filtering Then perform multiple filtering: filter out the acoustic emission signal with a duration of no more than 3000μs and an average frequency lower than 65KHz generated under no less than 80% self-tightening pressure; retain the final acoustic emission signal, which is the acoustic emission characteristic of the composite gas cylinder Signal. The invention realizes efficient extraction of vocal characteristic signals and greatly reduces the workload of data analysis.

Description

technical field [0001] The invention relates to a method for extracting acoustic emission characteristic signals of a carbon fiber-reinforced aluminum alloy lined composite gas cylinder, which belongs to the technical field of non-destructive testing, in particular to the acoustic emission parameter detection and analysis technology. Background technique [0002] Carbon fiber reinforced aluminum alloy lined composite gas cylinders are one of the important power sources of the engine systems of launch vehicles, satellites, spacecrafts, etc. Features. Its quality and reliability directly affect the safety and life of the aircraft, and are key and important parts of aerospace vehicles. [0003] The self-tightening pressure acoustic emission test is one of the key steps in the strength and quality assessment of composite gas cylinders. Under self-tightening pressure, the macroscopic maximum bearing force of the composite layer is close to about 60% of the fiber fracture streng...

AI Technical Summary

Problems solved by technology

Therefore, the traditional data analysis method can only give simple results such as the channel information of the concentrated acoustic emission and the convergence of the pressure-holding acoustic emission, but cannot clearly give the acoustic emission information related to the damage of the composite gas cylinder.

The main disadvantages of traditional data analysis are: (1) due to the interference of a large amount of structural noise, the serious damage information of the gas cylinder cannot be effectively found, and the accurate location information of the damage on the composite gas cylinder cannot be given; (2) the amount of data is large , the analysis efficiency is low, and the false detection rate is high; (4) The trend analysis cannot provide information on the remaining strength of the composite gas cylinder and the difference in batch quality

This has a very limited guarantee for the subsequent safe and reliable use of composite gas cylinders

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