结构共振的同类型泵组治理和研究

Treatment and Study on the Same Type of Pump Set with Structural Resonance

某电站多台大型立式泵组由于结构共振导致电机振动超标,通过动平衡方式进行振动治理过程中发现,结构共振的同类型泵组机械滞后角产生较大偏差,同时发现两套便携式仪表对同一测点采集数据过程中,振动相位存在较大偏差。为了确定滞后角度产生偏差的原因,以及振动相位偏差对动平衡过程的影响,文中通过频谱数据、固有频率、临界转速等综合分析,确定了机械滞后角产生偏差的原因,同时通过理论推导和实际数据计算,确定振动采集仪表相位偏差对试配重会产生角度偏差影响,而对于最终校正质量并不产生影响的结论。

Vibration of several large vertical pump set motor in a power plant exceeded the standard due to structural resonance.During the vibration treatment by dynamic balance,it was found that the mechanical lag angle of the same type of pump unit with structural resonance had a large deviation.At the same time,it was also found that there was a large deviation in the vibration phase during the data acquisition of the same measuring point by two sets of portable data acquisition instruments.In order to determine the reason for the deviation of the lag angle and the influence of the vibration phase deviation on the dynamic balance process,the reason for the deviation of the mechanical lag angle is determined through the comprehensive analysis of the spectrum data,natural frequency and critical speed.By theoretical derivation and actual data calculation,it is determined that the phase deviation will have an influence on the angle deviation of the test counterweight,but will not have an impact on the final correction quality.