Coupling Modeling Analysis Of Aircraft Metal Structure Intelligent Monitoring Technology

Although various new types of aircraft structural materials have been widely used,aluminum alloy materials are still one of the main materials for aircraft structures.Therefore,the reliability of aluminum alloy structures must be taken into account in aircraft design.The intelligent monitoring technology based on piezoelectric elements has a broad application prospect because of its high sensitivity to common minor damages in aluminum alloy structures.It has been widely studied by both domestic and foreign agencies as an efficient real-time online damage monitoring method.The coupling modeling analysis of the intelligent metal monitoring technology of aircraft is studied.Combining the finite element software ABAQUS and the related intelligent monitoring technology theory,the coupling modeling analysis of the intelligent metal monitoring technology of the aircraft is studied in this paper.The specific contents include:Firstly,the basic principle of the application of piezoelectric element in intelligent monitoring technology is discussed.The propagation characteristics of Lamb wave in aluminum alloy plate structure are studied.The sensor simulation analysis model applicable to the damage form of this paper is established,and the aluminum alloy is introduced.Method for modeling of intelligent detection technology in the case of material crack damage and hole damage.Then,an intelligent monitoring finite element simulation method for aluminum alloy plate crack damage is introduced in detail.The finite element simulation analysis of the aluminum alloy plate with no damage and crack damage is carried out respectively,and different positions and angles are obtained.The potential difference signal of each PZT piezoelectric sensor under different boundary conditions is damaged by the analysis of the variation law of these potential difference signals,and the approximate length and position of the crack in the aluminum alloy plate structure are inferred.Finally,a finite element simulation analysis method using Lamb waves to detect the damage of aluminum alloy plates is introduced in detail,and the displacement value response signals of each sensor in the state of health and hole damage are respectively compared,and it is initially clear whether the aluminum alloy plate is damaged or not.Then,after more in-depth analysis of the displacement response signals of the sensor at different hole depths,different hole radii,and different hole positions,finally,the time-domain displacement response signal is transformed into a frequency domain signal by applying a fast Fourier transform.The signal processing results of hole damage under different apertures were used to test the effectiveness of hole damage identification.