High-Speed And Real-Time Acquisition System With Multi-Channel For Large Data

An extremely important data reference for failure analysis and state monitoring is provided by the signal of vibration or noise no matter it is aimed at fault detection of small mechanical part or vibration monitoring of large mechanical equipment. The acquisition and storage of signal of vibration noise cannot be realized without the help of reliable and efficient acquisition systems, so the development of acquisition systems is playing an significant role in the social construction and production.An acquisition system is designed in this thesis with some useful properties such as multi-channel, high sampling frequency, transfer and storage of large amounts of data, high accuracy, high dynamic range and so forth. It can also be adapted to a variety of situations of signal acquisition. Realization of the high-speed and real-time acquisition system with multi-channel for large data.can effectively improve the level of engineering test, provid a powerful technical support of signal collection for all kinds of vocations, guarantee the efficiency and safety of social production。The main functions and properties of a variety of devices are put into research, including the connection principle of ARM, DSP and other peripherals. Hardware design of data acquisition is implemented based on multiple CPUs, combined with the three main CPUs such as ARM, DSP and CPLD, which takes full advantage of the characteristics and advantages of individual CPU and completes the control of acquisition system, data transmission and storage, signal recognition and processing and so on. In order to improve the capability of large data high-speed transmission between A/D and ARM or DSP, multi-channel audio serial interface (McASP) and enhanced direct memory access controller (EDMA) are employed with reasonable configurations and high speed transmission of the audio interface being used in the transmission of data, which greatly improves the sampling rate. Eight channels can be supported at the same time to work at a high speed in the sampling frequency of216KHZ. Meanwhile, data transmission and storage are achieved by EDMA, which is independent of CPU control and can ensure data acquisition and storage.Main function and performance test of acquisition system is implemented by the related software, verifying that the system can realize the function of the signal collection and storage with high speed and design requirements can be met by various performances.