微弱振动信号自适应采集系统设计
摘 要：在许多交通运行机械的振动信号测量中,强噪声和微弱振动信号混叠在正常振动信号中,给振动系统的微弱信号采集与分析造成了困难。针对该问题,设计一种基于TMS320F2812的四通道实时数据采集系统。该系统能够用于强噪声存在下的微弱振动信号采集,能够根据被测信号振幅变化自动调整控制放大器的增益,具有自适应数据测量与处理的功能,因而有较广泛的应用价值。
关键词：数据采集；数字信号处理；自适应放大；振幅检测
中图分类号：TP274文献标识码：B
文章编号：1004-373X(2009)05-187-04
Design of Weak Vibration Signal Adaptive Data Acquisition System
LI Yongjian,LI Shunming,HAO Qingqing,SHEN Huan
(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China)
Abstract：Both the significant noise and weak vibration signal are often mixed in the original vibration signal in many vehicle′s vibration signal detection,and it could make data acquisition and processing of weak vibration signal beccom more difficult.To solve this problem,a real-time data acquisition system with 4 channels using TMS320F2812 DSP is presented.The system can be used to acquire weak vibration signal in the significant noise background,and the gain of the amplifier can be adaptively adjusted according to the amplitude of the signal detected.This system has the function of adaptive data acquisition and processing of weak vibration signal.It can be used widely.
Keywords：data acquisition；DSP；adaptive amplification；amplitude detection
0 引 言
在机械结构的振动过程中,许多微弱信号包含机械运动的丰富特征信息,如故障特征信息等,有必要提取出来加以分析。而在微弱信号提取过程中,有时信号非常微弱,极易受到外界的干扰而淹没于强噪声之中,有时被测信号振幅变化范围又很大,给信号采集带来很大困难［1］。放大电路本身的噪声性能和频率特性也将影响到信号的提取精度［2］。对振动信号的采集及处理,通常是用普通的数据采集系统去采集...
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