摘要
利用NI公司的硬件设备和LabVIEW虚拟仪器开发平台构建了汽轮机振动数据采集与信号分析系统。系统具有以下显著特点:倒频谱分析功能模块谱线定位准确、幅值突出,易于区分源信号和系统传递函数,可较好地识别频域调制信号的边频成分;STFT功能模块以短时傅立叶变换方法为基础,克服了单纯采用快速傅立叶变换进行分析的不足;利用LabVIEW图形化的编程思想使得系统开发周期短,易扩展。强大的数学分析和信号分析处理功能,高效地实现了复杂干扰情况下汽轮机振动信号的提取和较为全面的分析,显示出虚拟仪器的巨大优势。
Data acquisition and signal analysis system for steam turbine vibration was composed of NI USB-6009 DAQ device and LabVIEW which was the virtual instrument development workbench. It has significant characteristic as below： Power cepstrum analysis function module has a nicety spectrum-line locating, prominent amplitude, distinguishes between source signal analysis and system transfer function easily, identifies frequency-domain-modulation-signal sidebands preferably; Based on the short-time Fourier transform, STYli＇ function module gets over the defect that FFT is adopted analyze only ; The idea that make use of LabVIEW graphical programming enable the system to develop period shorter and extend with facility. The abstraction of steam-turbine-vibration signal and comparative all-sided analyze is realized by the powerful mathematics analyze and analyze processing function in the situation of complex interference, the huge predominance of virtual instrument is showed.
出处
《汽轮机技术》
北大核心
2008年第6期474-476,共3页
Turbine Technology
