大形機関の据え付け点インピーダンスの計測法

Abstract

A ship is equipped with many apparatuses which had the reason for the growth of vibration. Particulalry, it may give rise to the serious large vibrations due to the coupling effect of main engine and the double deck bottom. As its size is becoming larger, the natural frequencies are decreasing, it has become unavoidable that it happens to resonates under the usual running condition of the main engine. For that reason, it is important to decrease engine and hull vibration considering the coupling vibration behavior. Therefor, we tried to apply the mechanical impedance method to solve these vibration problem. However, measuring method of mechanical impedance of support points of large diesel engine has not been established until now. This paper described a new method which was suggested to measure the mechanical impedance, and showed the experimental results using the plastic model to show the effectiveness of this method.