在对某型柴油机泵组进行现场振动测试过程中，通过分析振动频谱数据，发现频谱图中基频振动异常，存在基频振动故障。通过分析故障原因，对柴油机安装底座进行固有频率的测试分析，发现底座存在一阶固有频率与泵组基频一致，认为底座在泵组工作过程中发生了共振，造成柴油机的基频振动异常。为消除共振现象，对底座进行优化加固，加固完成后进行振动复测，振动数值降低明显，振动情况得到有效改善，满足交机要求。
During the vibration test of a diesel engine pump set, it’s found that there is an abnormal vibration under the fundamental frequency through the analysis of the vibration spectrum, and it’s a vibrational fault. By analyzing the causes of the vibrational fault, a natural frequency test for the mounting base of the diesel engine is carried out, and it’s found thata natural frequency of the base is consistant with the fundamental frequency. It’s for sure that the resonance of the base occurs under the rated working condition and makes the fundamental frequency of the diesel vibrate abnormally. In order to solve the resonance, the base is strengthened, then a vibration test is done again. The data shows that the vibration condition is improved a lot and meet the requirments for acceptance.
2021,43(11): 119-121 收稿日期：2021-09-18
DOI：10.3404/j.issn.1672-7649.2021.11.022
分类号：TK423
作者简介：冀洵(1987-)，男，工程师，研究方向为舰船动力
参考文献：
[1] 杨国安. 机械设备故障诊断实用技术[M]. 北京: 中国石化出版社, 2016.
[2] 韩杰, 张瑞林, 等. 旋转机械故障机理及诊断技术[M]. 北京: 机械工业出版社, 1997.
[3] 欧阳光耀, 高洪滨, 等. 安装基础刚度对柴油机振动烈度的影响分析[J]. 内燃机工程, 2007, 6(28): 70–72
[4] 陈虹微. 旋转机械振动特征及诊断方法[J]. 噪声与振动控制, 2009, 1: 134–136,146
[5] 何国安, 张卫军, 等. 传递函数在锅炉给水泵结构共振故障处理中的应用[J]. 中国电力, 2010, 43(1): 46–50
[6] 吴江莲, 许德忠, 等. 核电站立式泵组结构共振分析与防治研究[J]. 水泵技术, 2017, 3: 5–8
[7] 许本文, 焦群英. 机械振动与模态分析基础[M]. 北京: 机械工业出版社, 1998.
[8] 张义民. 机械振动[M]. 北京: 清华大学出版社, 2007.
