摘要
针对某柴油机刚性安装在试验台上时振动烈度偏大的情况,测量了该机器及安装基础的振动速度信号,并在停机状态下测试了安装基础的速度导纳。对柴油机和安装基础的振动速度信号进行了相干分析,结合速度导纳测量结果,发现安装基础横向刚度不够是振动烈度偏大的主要原因。理论和试验结果证明:增加安装基础横向刚度可以减小安装基础的横向振动,进而减小柴油机的横向刚体运动,从而降低柴油机台架试验时的振动烈度。
Vibration intensity of a diesel engine was over criterion when it was stiffly set up on its foundation. To found out the reason, vibration velocities of the engine and its foundation were measured and their coherence was analyzed. Velocity admittance of the foundation was measured, too. Based on these measurements, a conclu- sion was drawn that small stiffness of the foundation was important reason of vibration intensity that was over criterion. Vibration theory and experiment measurements indicated that vibration of the foundation would be reduced when stiffness of foundation was enhanced, and velocity intensity of the diesel engine would be reduced, too .
出处
《中国修船》
2007年第3期20-22,共3页
China Shiprepair
关键词
柴油机
振动烈度
刚度
刚体运动
diesel engine
vibration intensity
stiffness
rigid displacement
