수중 폭발에 의한 함정용 보조기계의 내충격 성능 평가에 관한 연구

Abstract

The non-contact underwater shock response on a naval ship has attracted much attention after the World War II. It is known that the critical damages on a naval ship due to non-contact underwater shock are in on-board equipments than ship structure. The evaluation of on-board equipments is performed by theoretical analysis or experimental methods.

The theoretical analysis can reduce the cost during the design and the test. In this paper, we investigated the lubricating oil purifier heater by the theoretical analysis. The dynamic design analysis method and transient analysis was used. For the comparison, the experimental test was also done.

The shock test on lubricating oil purifier heater was done at the certification authority. The experimental test was performed by the procedure in military specification 901D. The medium weight shock machine was used for the shock test. We measured the vertical shock accelerator at the equipment under test.

The general analysis tool, ANSYS, was used for the dynamic design analysis method and the transient analysis. We calculated the stress and the shock accelerator of the equipment.

After the shock test, the external shape and the performance of the equipment under test was checked. The effect of the shock test was negligible. It was compatible with the theoretical results. The stress calculated by the dynamic design analysis method was less than the allowable value. Also, the stress calculated by the transient analysis method was also less than the allowable value.

To estimate the effect of the shock wave induced by a non-contact underwater explosion, the theoretical analysis using dynamic design analysis method or transient analysis can be a proper approach. This study can be used for the design and the test of on-board equipments for the naval ship.