标题：Estimation of changing vibration conditions of complicated mechanisms using vibration characteristics of start-ups and run-downs
作者：Brancevich, Peter ;Li, Yibin
作者机构：[Brancevich, Peter ] BSUIR, 6 P. Brovki Street, Minsk; 220013, Belarus;[Li, Yibin ] Shandong University, School of Computer Science and Engineering, S 更多
会议名称：23rd International Congress on Sound and Vibration, ICSV 2016
会议日期：10 July 2016 through 14 July 2016
来源：ICSV 2016 - 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics
摘要：In many cases, when possible, the technicians dealing with operation and maintenance of multi-seat rotary aggregates analyze the vibration characteristics, obtained during rundowns (free breaking of the running shaft) when the mechanism is being stopped, or during startups. This is essential when evaluating the technical condition of the operated object and planning the routine maintenance and repair works. The start-up and rundown vibration characteristics are the key features widely used to evaluate the technical condition of the mechanisms and aggregates that use friction-type bearings (turbo machinery, powerful pumps and drives). These characteristics are remarkable, since the vibratory excitation at frequencies take place during the transition period, referred to the changed shaft rotation frequency. Therefore the parameters of the vibration harmonic constituents, calculated in these operation modes, make it possible to evaluate the frequency values, the shaft misbalance, as well as to reveal a number of other defects. The paper considers the automation strategy for the comparative analysis procedure of the startup and rundown vibration characteristics. A number of parameters have been selected that describe the amplitude factors and distinctive features of these characteristics' shapes. The decision functions are proposed to conclude regarding similarity or difference of the comparable characteristics. The paper discusses the practical examples of estimating the vibration conditions of the bearing assemblies in some turbo machinery are presented. In the considered cases, while the changes in the vibration intensity in the stationary mode were relatively insufficient, the rundown vibration characteristics varied substantially.