求翻译：本文以F3精轧机为研究对象，建立了主传动系统和轧机机架系统的力学模型、数学模型，运用MATLAB软件计算出来两系统的固有频率和轧机机架的主振型，根据现场测试的振动频率发现，轧机产生异常振动的频率与主传动系统的第三阶固有频率相近，振动的优势频率集中在主传动系统的弧形齿接轴和上下梅花接轴处，由此可确定轧机的振动源在主传动系统。在轧机机架垂振信号中包含主传动系统的扭振信号，可确定扭振激发了机架垂振。是什么意思？

A of f3 fine mill, the main transmission system and the mechanical model of the rolling mill system, mathematical model, using Matlab software to calculate the two frequency of the system and rolling mill vibration mode, according to the vibration of the field test , the rolling mill to produce the

This paper provides a F 3 fine mills as the object of study, to establish the main drive system and rolling rack system mechanics models, mathematical models, use two calculated MATLAB software system the natural frequency of the rack and mills main vibration model, based on an on-site testing, and

This to F3 fine mill for research o