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随着计算机和微处理机在振动分析领域中获得新的应用,更高级的自动化数据管理和故障检测已成为可能.诚然,总能级报警在某些场合下是有用的,但对低能量振动却不够灵敏,如轴承故障,往往在未能触发报警的情况下即导致事故.包络报警法由于能检测出全频率范围内的振动变化,故有了明显的进步.变量成形和阶比分析法使这种方法进一步得到改善.但是,包络线报警法基本上不能区别振动中有意义的变化和随机变化,而且也不能确定用来形成包络线的参考频谱是否已包含有机械故障的峰值.相比之下,选择频带报警法是以工业应用中所积聚的经验为基础的.对于某个确定的机器或机器类别,它将频谱分成几个有意义的特定频带,并将适当的报警级用于每个频带.这样,系统不但可同时检测高能和低能的机器故障的发展,还可比包络报警法大幅度减少伪报警的次数.此外,频带和报警限值也可在数据采集时使用,让使用者在现场立即知道已在发展中的报警情况.由于可将已建立的通用参数集应用于各类机器,使此系统既有效又具有实用价值.本文介绍选择频带报警法及其应用、效果和案例研究.1.选择频带报警法选择频带报警法的原理是:特定的机器故障将在特定的、容易确定的频率(即故障频率)下产生振动.因此,对诸如失衡、失调、轴承故障等已知的故障频?
As computers and microprocessors gain new applications in the field of vibration analysis, more advanced automated data management and fault detection have become possible.Of course, total level alarms are useful on some occasions, but for low energy vibrations But not sensitive enough, such as bearing failure, often fail to trigger the alarm that led to the accident. Envelope alarm method can detect changes in the entire frequency range of the vibration, it has made significant progress. Variable formation and order analysis However, the envelope alarm method basically can not distinguish between meaningful changes and random changes in vibration, and it can not be determined whether the reference spectrum used to form the envelope already contains a mechanical fault In contrast, the choice of band alarm method is based on the experience accumulated in industrial applications.For a given machine or machine category, it divides the spectrum into several meaningful specific frequency bands, and the appropriate The alarm level is used for each frequency band so that the system not only detects the development of high-energy and low-energy machine faults simultaneously but also significantly reduces the number of false alarms compared to the envelope alarm method. , Frequency bands and alarm limits can also be used during data acquisition to let users know immediately what is happening in the field of alarms. Since the established universal parameter set can be applied to all types of machines, the system is both efficient Has the practical value.This article introduced chooses the frequency band alarm law and its application, the effect and the case study.1, chooses the frequency band alarm law to choose the frequency band alarm method the principle is: The specific machine breakdown will in the specific, easy determination frequency (namely the breakdown frequency ) Vibration Therefore, such as imbalance, imbalance, bearing fault known frequency of failure?