摘要
针对频谱泄漏及栅栏效应问题,建立了基于整周期重采样技术提高振动分析精度的方法,采用振动信号同步采集的频率计算整周期采集所需的时间,利用此时间可以对波形实现整周期重采样,并且在相位计算时,对各个通道补偿因循环采样所产生的相位误差。研究结果表明:该方法对振动信号可以实现整周期重采样,并能显著提高振动信号的幅值及相位精度,具有对数据采集系统硬件设备要求低、计算精度高的优点,可广泛应用于大型旋转机械的在线监测。
Aiming at improving the accuracy of vibration signal analysis,a method based on the full period re-sampling technology was established.The full period sampling time calculated by the frequency synchronously sampled with the vibration signal was used to re-sample the waveform.And each channel was compensated with the error phase generated by loop sampling between channels.The study shows that this method can re-sample the vibration signal in periods correctly and increase the accuracy of amplitude and phase.Because of its low hardware requirement and high accuracy,it can be widely used in on-line monitoring of large rotating machinery.
出处
《机电工程》
CAS
2011年第2期153-156,161,共5页
Journal of Mechanical & Electrical Engineering
基金
国家高技术研究发展计划("863"计划)资助项目(2007AA04Z433)
国家自然科学基金重点资助项目(50635010)
关键词
振动信号
键相
相位补偿
整周期重采样
vibration signal
key phase
phase compensation
full period re-sampling
