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Gas leakage testing of aircraft air-tightness system has always been an important work in the aircraft maintenance. Quantitative testing of gas leakage signal drowned in noise is hardly realized alone by ultrasonic detection instrument. In this paper, theory of ultrasonic and small orifice gas leakage has been employed, and a mathematical model based on ultrasonic testing gas leakage of aircraft air-tightness system has been deduced. Through improved chaos Duffing oscillator equation and improved wavelet threshold denoising algorithm, weak period signal in the strong noise background has been successfully distinguished and denoised. Along with software and hardware assistant discrimination means, ultrasonic testing will be more effective to stop gas leakage of aircraft air-tightness system.

Research on Ultrasonic Testing Technology of Gas Leakage in Aircraft Air-tightness System