One of the primary sources of vibration on ships is the main engine. The FRP Express Cantika 88 is a monohull passenger ship that uses three main engines. The interviews with passengers show that the vibrations interfere with comfort during the trip. This is evident after the initial measurements in the field using a vibrometer. The tool shows the amplitude number that appears at 0.26 > 0.02 mm. The purpose of this research is to overcome the vibrations that occur in the wall area of the ship's

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... passenger room by installing a damper layer on the wall. The method used in the analysis process is to perform calculations and simulations. Where the effectiveness of the reducer is known by analyzing the value of the amplitude and frequency ratio on the wall due to the work of the ship's main engine. The analysis is carried out through a calculation and simulation process in the horizontal and vertical vibration directions. Vibration analysis needs to be carried out in conditions without dampers and using dampening layer materials. The damping layer material used is 3 mm and 5 mm rubber, while the laminated bamboo material with the same thickness is 3 mm and 5 mm. The analysis results from calculations and simulations show that the damper layer on the ship's walls is effective in the vertical vibration direction where the 3 mm and 5 mm rubber layers can dampen the vibrations that occur respectively 93% with an Amplitude of 4.10x10-6 mm and 81% with an Amplitude of 1,01x10-6mm. Thus, this study shows that the 3 mm rubber damper layer effectively reduces the vibrations that occur on the ship's walls.