求翻译：通过现场测试的振动信号，分析了弯扭、垂扭之间的耦合振动，发现轧机的弯振和垂振信号中均包含了扭振频率，证明了主传动系统的扭振引起了轧机的弯振和扭振，印证了理论分析的正确性。分析了振动信号的非线性，证明了轧机的振动形式为稳态自激振动。分析了轧机机电耦合振动耦合现象，证明了电气回路产生的电磁谐波分量，可产生相应频率的谐波转矩,使传动系产生扭振现象。是什么意思？

Field test of the vibration signal analysis of the coupling between bending and torsion, twisting vertical vibration, found that the bending vibration and vertical vibration signal of the mill torsional vibration frequency, proved that the main drive system torsional vibration caused by the bending

Through field testing, the vibration signal analysis of the twist, twist-vibration coupling between the mills and found that bending vibration, and vibration signals, is included in a twist-resonant frequency, demonstrate that the main drive system of the twist-rolling mill of the vibration caused b

Through field testing of vibration signal analysis, between vertical torsion coupled bending-torsion vibration, found of bending vibration of rolling mill and vertical vibration signal contains a frequency of torsional vibration, proved the main drive system of torsional vibration caused by the bend