基于EMI與ANN技術(shù)水下固定頻率信號探測研究
[Abstract]:With the development of ocean technology and shipping industry, it is more and more urgent to explore the underwater signal. Whether it is for detecting the aircraft black box after the crash or looking for other components that transmit fixed frequency signals in the water, it is of great significance to protect personal safety and social property. Aiming at the complicated underwater signal detection and the situation that there are many factors affecting the signal detection, this paper designs the experimental device and detection theory of the underwater fixed frequency signal component based on piezoelectric impedance technology, builds the simulation ultrasonic beacon detection experimental platform, and carries on the detection experiment under water, finally combines with BP neural network. The main contents of this paper are summarized as follows: (1) The research status of underwater frequency signal detection and recognition at home and abroad is summarized, and the application of piezoelectric materials and EMI (piezoelectric impedance technology) technology is introduced, as well as the future development direction, and ANN (human) is introduced. The theory of piezoelectric coupling impedance is expounded and the relationship between piezoelectric impedance and mechanical impedance is analyzed. (2) Finite element analysis of piezoelectric ceramic sheet is carried out by using ANSYS APDL medium piezoelectric analysis module, and the deformation amount and main deformation direction are analyzed. Free modal analysis is carried out on the base of the receiver, and the approximate natural frequency near the target signal is obtained, which provides a certain reference for the experiment. (3) A fixed frequency signal detection device based on piezoelectric impedance technology is designed, and an experimental platform is built to simulate the detection of fixed frequency signal. (4) The basic theory of neural network positioning and three-ball positioning is put forward, and the BP neural network used to locate the fixed-frequency signal of the target is created. After training, the network is used to locate the target signal. It is proved that it is feasible to detect and locate the fixed frequency signal of the target by combining the neural network technique with the piezoelectric impedance technique.
【學(xué)位授予單位】:安徽理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P715.5
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