基于声学特性的灯泡贯流式水轮发电机组噪声信号采集系统设计

大量程、高精度的噪声信号采集是基于声学特性的灯泡贯流式水轮发电机组故障诊断的前提.为此,该文设计一种灯泡贯流式水轮发电机组噪声信号采集系统,介绍噪声信号采集系统原理,完成基于两级分段组合的放大电路设计,解决传统单级调理电路不易实现全量程、大动态范围信号放大的问题,给出详细的信号放大电路、滤波电路等参数设计方法和采集卡A...

Design of noise signal acquisition system for bulb tubular hydro-generating unit based on acoustic characteristics

It is the premise of the fault diagnosis of the bulb tubular hydro-generating unit based on acoustic characteristics that the large-range noise signals are accurately acquired.In this paper,a system of acquiring the hydro-generating unit’s noise signals is designed.The principle of acquiring the noise signals is introduced,and the two-stage piecewise combined amplifier is proposed,which can solve the problem that the single-stage conditioning circuit is not easy to amplify the noise signal with the full range and the large dynamic range.In addition,the methods for solving the parameters of the amplifier and the filter,and the DAQ card are given in detail.The results of the simulation experiments and the field tests show that the measurement range of this proposed system is 20–140 dB,and the maximum linear error is 0.3 dB,which can provide the reliable data of fault diagnosis of the bulb tubular hydro-generating unit.