Design And Implemention Of Compound Vibration Signal And Acoustic Emission Signal Acquisition System

In industrial production,transportation and other fields,equipment will generate a large number of vibration signals during operation.The collection and analysis of vibration signals to monitor the condition of the equipment is of great significance for improving production efficiency and reducing safety accidents.However,detection methods based on vibration signals are difficult to find early failures such as cracks and crack expansion caused by equipment during long-term operation and operation.Acoustic emission technology is sensitive to material deformation to make up for the defects of vibration detection.Aiming at the shortcomings of single vibration signal or acoustic emission signal detection,this research combines vibration detection and acoustic emission detection to design a composite vibration-acoustic emission signal acquisition system.It mainly includes the following research contents:Designed and implemented a composite vibration-acoustic emission signal acquisition system based on vibration and acoustic emission.The system is based on a filtering and amplifying circuit based on an operational amplifier and a collection and transmission circuit based on a field programmable gate array,combined with a composite vibro-acoustic emission signal monitoring platform that performs data display and management functions on the vibro-acoustic emission signal to realize the operation of the equipment Simultaneous acquisition,analysis,diagnosis and comparison of vibration signals and acoustic emission signals.The following issues are specifically studied:Aiming at the problem of inconsistency in frequency characteristics of vibration and acoustic emission signals,a conditioning and acquisition circuit for vibration and acoustic emission signals is designed,and a multi-stage amplifier circuit based on operational amplifiers is built to perform charge conversion and filtering and amplifying the signals,using field programmable gate arrays as The control chip performs acquisition and transmission control,and realizes the conditioning,acquisition and transmission of the vibration acoustic emission signal.In view of the large amount of acoustic emission signal data causing delays in processing after transmission,a time-frequency domain characteristic analysis based on field programmable gate arrays was designed,and the characteristics of field programmable gate array parallel computing were used to effect vibration acoustic emission signals in the equipment hardware.Perform synchronous analysis in time and frequency domain to realize synchronous analysis and transmission of equipment vibration and acoustic emission signals.In view of the lack of monitoring software for synchronous monitoring and comparative analysis of equipment vibration and acoustic emission signals,a composite vibration and acoustic emission signal monitoring platform was designed,including data communication,visual interface,data management and other functions,and vibration and acoustic emission were designed.,Vibration-acoustic emission diagnosis and comparison interface,realizes the real-time display of vibration and acoustic emission signals,historical data query and export,and diagnosis comparison functions.Finally,a gearbox failure experiment platform was built,and the designed composite vibration acoustic emission signal acquisition system was functionally tested.Acoustic and vibration data at different speeds were collected to verify the system’s synchronous acquisition and transmission functions;lead-breaking experiments were carried out to carry out the gear fracture process.Simulation has verified the system’s synchronous analysis and fracture detection functions;comparative experiments on fault detection analysis based on vibration,acoustic emission,and vibration-acoustic emission have been carried out.The results show that the composite detection based on vibration-acoustic emission is compared with traditional vibration detection and acoustic emission.The detection has a higher accuracy rate.