Design And Implementation Of ZYNQ-based Acoustic Emission Acquisition System

Acoustic emission detection technology is sensitive to linear defects,insensitive to geometry and can be applied in harsh environments where other inspection methods are difficult to apply,it is widely used in petrochemical,aerospace and transportation industries.The acoustic emission data acquisition system is the basis and prerequisite of acoustic emission detection technology.This paper designs a ZYNQ-based dual-channel acoustic emission acquisition system,completes the design of ZYNQ-based acoustic emission acquisition board,the design of Qt-based host software,and designs experiments to verify the functions of the acquisition system,the main research contents include:(1)Overall design of the dual-channel acoustic emission data acquisition system.First of all,the overall design parameters of the system are proposed according to the characteristics of the acoustic emission signal with wide frequency band,sudden generation and short duration,and the overall framework of the whole acoustic emission acquisition system is determined according to the above requirements.According to the hardware system characteristics and design requirements,we determine the digital logic design and software design of the acoustic emission acquisition card as well as the functional architecture of the host computer software.(2)Design of data transmission board for dual-channel acoustic emission acquisition system.For the data acquisition and transmission of acoustic emission data acquisition system,ZYNQ 7010-based acoustic emission data acquisition and transmission board is designed,and the main design contents include:①The construction of PL(Programmable Logic)part of the hardware platform,the PL side of the hardware platform mainly includes over-threshold sampling module,FIR filter,AXI-Stream interface module,and the hardware platform is exported through the bitstream file generated by Vivado tool.The embedded software code design of PS(Processor System)side,using Vitis IDE to call the hardware platform and build a software development environment on the platform to link with the hardware platform,using C language to realize the DMA transfer,timer interrupt and Lwip UDP Gigabit Ethernet data transmission and other program design.(3)Qt-based dual-channel acoustic emission acquisition system upper computer software design.The Qt-based upper computer software is designed for real-time data display of the acoustic emission acquisition system.It provides a friendly operation interface and intuitive data display for the acoustic emission signal acquisition and transmission module,and uses Udp socket to communicate with the lower computer via Gigabit Ethernet to complete the acquisition and display of the acoustic emission signal;uses a multi-threaded approach to extract the characteristic parameters of the acoustic emission signal and display them on the upper computer interface in real time;uses a SQLite database to store and manage the extracted characteristic parameters of the acoustic emission.SQLite database is used to store and manage the extracted acoustic emission parameters.(4)Testing and verification of the performance of the dual-channel acoustic emission acquisition system.In order to verify the functions of the acoustic emission acquisition system in different aspects,three sets of verification experiments were designed for different purposes to verify the data acquisition function of the lower hardware acquisition board of the acoustic emission acquisition system,the acoustic emission feature parameter extraction function of the upper computer software,and the synchronization of the signal acquisition function of the whole acoustic emission acquisition system.In order to verify that the system can be used in regular industrial applications by acquiring the leakage signal of gas tank-type pressure vessels.The system is verified to be properly applied in the conventional industrial field.From the demand of acoustic emission detection,ZYNQ-based dual-channel acoustic emission data acquisition system is studied and designed to realize the basic functions of acoustic emission signal acquisition and transmission as well as extraction and storage of characteristic parameters.The unique architecture of ZYNQ chip solves the problems of narrow data transmission bandwidth and complex transmission protocol design between"FPGA+DSP" chips,and provides a new idea for the design of acoustic emission data acquisition system.