Research And Design Of Acoustic Emission Detection System Based On DSP

Mineral resources is the precious wealth in our country, playing an important role in national economic development. The development of the national economy causes a great demand for mineral resources, leading to increasingly frequent mining activities. With the progress of mining activities,the stability of rock mass in mines become changed, and that may lead to collapse of rock mass, which brings direct threat to the life safety of underground workers. Acoustic emission technology as a new dynamic nondestructive testing technology, can be used to monitor the stability of rock mass in mines. It can be used to forecast landslides and roof fall of rock mass in mines to avoid accidents, which has great significance for promoting safety production of mines and protecting the people’s life and property safety. The multichannel and portable acoustic emission detection system for rock mass in mines based on DSP is designed in this paper, and the main work is as follows:(1) This system mainly should complete data acquisition, signal processing, data transmission and feature parameter extraction functions.According to the functional requirements of the system, TMS320VC5402 is selected as the DSP chip, ADS7864 is selected as the A/D converter chip, and CY7C68013A is selected as the USB communication chip, then the overall design scheme of hardware and software of the acoustic emission detection system are given.(2) As for the hardware design, the minimum system of TMS320VC5402, the memory extension circuits of TMS320VC5402, the interface circuits between ADS7864 and TMS320VC5402, and the interface circuits between CY7C68013A and TMS320VC5402 are all designed.Hardware is designed on the circuit design software Cadence 16.5, a variety of anti-interference measures are used on the PCB design.(3) In terms of the software design, the A/D sampling program and FIR filtering program are designed in CCSv5.2 to collect original rock mass acoustic emission signal and process FIR filtering. By the USB firmware program, the data of the acoustic emission signal after filtered is transmitted to the upper computer. The executable wavelet threshold denoising program is executed on the upper computer to denoise the signal filtered, and then the executable feature parameter extraction program is executed on the upper computer to extract the time domain and frequency domain feature parameters on the signal denoised.At last, the test platform is established to test the acoustic emission detection system. The test result indicates the system design complies with the design requirement, and reaches the expected design purpose.