Prediction Method of Coupled Vibration Response with Large-sized Engine and Hull

—Application of Measurements of Engine Support Points Mechanical Impedane—

Abstract

A ship is equipped with a large engine that increases ship vibrations. Particularly, it may give rise to the serious large vibration problems due to the coupling effect of the large engine and the hull. So, it is important for us to grasp vibration characteristics of each support point of a large engine. However, a measuring method of vibration char-acteristics of support points of a large engine has not been established until now because a ship engine is too large. Therefore, we tried to apply Mechanical Impedance Method to prediction of mechanical impedance at each support point by the former paper. This paper confirms utility of the experimental analytic method for measuring impedance characteristics of support points of a large engine that we suggested. And we showed the effectiveness of Mechanical Impedance Method by using the experimental results of the engine and hull models on prediction coupling vibration.