摘要
将Hilbert解调和倒谱分析方法结合起来对齿轮箱点蚀故障进行了诊断研究。首先介绍了Hilbert解调和倒谱的基本原理,然后针对Hilbert解调和倒谱等单种方法的不足,论述了将Hilbert解调与倒谱分析结合用于齿轮箱故障诊断的基本思想,最后通过QPZZ-II.旋转机械故障试验系统进行了齿轮箱点蚀故障的实例验证分析。研究表明,Hilbert解调技术可以解调出调制信号,但在处理相加信号时有局限性;倒谱可以区分出边频带中的周期成分,将成簇的边频带简化为单根的谱线,受传递路径影响小,但当调制边频的幅值不大或者信号中含有较大噪声时,倒谱中得到的调制频率的幅值并不明显;将这两种方法结合起来可以很好地克服传统单种方法存在的憋端,可对齿轮箱的点蚀故障进行有效诊断。
This paper presents a method which combines Hilbert demodulation with cepstrum to diagnose the gear pitting corrosion fault in gearbox. Firstly, the basic mechanisms of Hilbert demodulation and eepstrum are introduced. Then the Hilbert demodulation and the cepstrum are adopted together as an improved method to come over the shortcomings of these two single methods. Finally, experiments are taken on a QPZZ - II rotating-machinery fault simulating system to verify this improved method. The results show that Hilbert demodulation can extract infor- mation from a modulated carrier wave, but it has limitations in dealing with sum signals. Cepstrum can discriminate periodic component from sidebands and simplify sidebands into a single spectrum line. Moreove, it can be weekly influenced by the transmission path. However, its modulation frequency amplitude is not obvious when the amplitude of modulation sidebands is little or the signals comtains numerous noises. The improved method proposed in this paper can overcome the weakness of the traditional single methods and it is effective for the diagnosis of the gear pitting corrosion fault.
出处
《电力科学与工程》
2011年第3期36-40,共5页
Electric Power Science and Engineering
关键词
齿轮箱
Hilbert解调
倒谱
点蚀
故障诊断
gear box
Hilbert demodulation
cepstrum
pitting corrosion
fault diagnosis
