高速纸机压榨部结构动力共振研究

Dynamic Systematic Structure Resonance of Press Section of a Modern Paper Machine

研究了1台现代化高速纸机压榨部的动态运行过程和尚未被人们意识到的结构动力共振现象,同时探讨了其研究方法、结构动力共振车速。研究表明本机(设计车速1700m/min,操作车速1500m/min)压榨部结构动力共振车速为1047～1197m/min(7.0～8.0Hz);高速造纸机在设计运行车速范围内,各部套存在动态系统结构动力共振是一种普遍现象,其区别于部件故障劣化状态;高速纸机结构动力共振产生的原因为转件基本共振和支承共振的结合;不同纸机各部套动态结构动力共振车速有差别,可通过不同车速范围运行过程与提速过程中的跟踪比较综合确定。研究其数值,可以确保关键部件安全、耐久、经济运行;掌握零部件故障状态及其变化与部套结构动力共振工况点是现代高速造纸机状态监测与故障诊断的两个同等重要方面。

This paper mainly referred to the finding of the existence of Dynamic Systematic Structure Resonance (DSSR) of Press Section of a Modern Paper Machine (PSMPM) during the studying of PSMPM's dynamic characteristics. The result indicated that the DSSR running speed of this PSMPM was 1049 - 1197 m/min (7.0 - 8.0 Hz). DSSR is a common phenomenon in every section of a modern high-speed paper machine (usually consisting of six sections) which has not been well known and is different from the fault. It can keep a paper machine running safely, durably and economically when machines' DSSR number and the way to bypass the DSSR running speed are understood during the running operation. The sections in different paper machines have different DSSR running speeds, which can be determined by the comprehensive study of vibration numbers under different running conditions and during increasing-speed running. It is equally important for both studying and tracking the fault conditions to understand their changing states of the components in paper machines and finding the sections' DSSR working conditions.