Assessment of noise exposed population is to check the environment noise level and social influence in order to reduce the risks such as annoyance and disturbance that are generated by environmental noise. Also, this method suggests the preferential noise abatement policy and action plan by accurately finding the area that the noise causes harmful effect to human health. Recently, a noise map, which can predict noise in comprehensive area, is used for the assessment of noise exposed population, breaking from the methods using existing measures. In particular, countermeasure for noise can be considered more effectively by using assessment methods of noise exposed population for specific noise level, area, and building types which are the main input factors in noise maps. In this study, we propose noise reduction ranking decision at ship construction and repair process due to noise map.

The object of this paper is to examine the noise generating mechanism at ship construction and repair precess. To accomplish the object; A noise generating mechanism of high noise machine, which is mounted in the ship construction and repair process, was investigated. The measurement method of the noise for the machine by ship construction were investigated. The noise at the 250 points of the manufacturing process machine in the 40 processes of the 3 factories, 3 business fields was measured. The database of the noise was built from the measurement data. The major sound sources and frequency range for the manufacturing process of metal material product machine was investigated.

There is a considerable amount of research on ship worker’s hearing loss caused by vibration and noise that comes from the ship’s construction. A further investigation that characterizes the sound that comes from building or repairing a ship is nonexistent or insufficient, however. To do this, a noise management plan is needed. It should include a generated sound process from the main sources of disturbance in the ship- building areas. And a soundproof measurement will identify the amount of noise reduction needed for a hearing- safe working environment. Finally, researchers in this study measured tests on the noise and the vibration process, and the noise caused by operations allowed for an investigation on the suitability of certain environmental conditions. Noise-related programs can be used to predict the noise distribution of the noise level characteristic. This can help identify and reduce the presence of sound interference through sound proofing measures.