고장 사례 분석을 통한 수중함용 디젤엔진 건전성에 관한 연구

국문 초록 (Abstract)

본 연구는 고장 사례 분석을 통한 수중함용 디젤엔진 건전성에 관한 내용으로 수중함 건조 중 발생한 비정상 디젤엔진 정지 현상에 대한 발생 원인을 다각도로 분석하였으며 또한 2차 손상 부위에 대한 건전성을 검토하였다. 디젤엔진 정지 현상에 대해서는 비정상 전 후로 피스톤 내부 온도변화 및 손상부 점검 확인을 통해 분석 하였다. 또한 폭발로 인한 2차 손상 부위를 분석하기 위해 디젤엔진의 가장 핵심 부품인 크랭크 축으로 전달되는 인장응력 및 압축응력을 계산 하였고 유한요소 해석을 통해 응력분포를 검토 하였으나 크랭크 축은 설계적으로 안전하다는 것을 확인 하였으며, 최종적으로 디젤엔진을 함 외부로 취외하여 정밀 점검 하였을 때에도 크랭크 축에는 손상이 없는 것을 확인 하였다. 본 연구결과를 통하여 디젤엔진 비상정지 사고 발생에 대한 크랭크 축의 건전성을 사전 검증하였다. 이에 최소 범위에서 점검 및 복구하였으며 디젤엔진 품질을 확보 할 수있었다. 본 연구를 통하여 향후 디젤엔진 품질문제 검토 시 건전성확보를 위한 참고자료로 활용될 수 있을 것으로 기대된다.

다국어 초록 (Multilingual Abstract)

This study examined the integrity of diesel engines for underwater vessels through failure analysis, analyzed the causes of abnormal diesel engine stoppage during building and examined the integrity of secondary damages. The diesel engine stoppage was analyzed by checking the temperature change of the piston before and after the abnormality and checking the damage. In addition, in order to analyze the secondary damage caused by the explosion, the tensile and compressive stresses transmitted to the crankshaft, the core part of the diesel engine, were calculated, and the stress distribution was examined through finite element analysis, but the crankshaft was designed by safety. It was confirmed that there was no damage to the crankcase even when the diesel engine was taken out of the ship and closely inspected. The integrity of the crank shaft was verified in advance for the occurrence of diesel engine emergency shutdown accidents through this research result. Therefore, the inspection and restoration were carried out to the minimum extent, and the quality of diesel engines was secured. This study is expected to be used as a reference for ensuring soundness in any future review of diesel engine quality problems.

목차 (Table of Contents)

• 요약
• Abstract
• 1. 서론
• 2. 본론
• 3. 결론
• References

참고문헌 (Reference)

1 나라별, "고장 사례분석을 통한 유도탄고속함 함포체계 사격안전성 개선방안 연구" 한국군사과학기술학회 20 (20): 159-169, 2017

2 Ornella Chiavola, "Vibration analysis to estimate turbocharger speed fluctuation in diesel engines" 148 : 876-883, 2018

3 W. Park, "Use of Multiple Injection Strategies to Reduce Emission and Noise in Low Temperatrue Diesel Combustion"

4 Y. Liu, "The Effects of Pressure Difference on Opposed Piston Two Stroke Diesel Engine Scavenging Process" 142 : 1172-1178, 2017

5 S. Patel, "Numerical investigation for predicting diesel engine performance and emission using different fuels" 160 : 834-841, 2018

6 J. Lee, "Effect of Multiple Injection strategies on Emission and Combustion Characteristics in a Single Cylinder Direct-Injection Optical Engine"

7 T. V. Johnson, "Diesel Emission Control in Review"

8 R. Thakar, "Design of Heat Exchanger for Waste Heat Recovery from Exhaust Gas of Diesel Engine" 20 : 372-376, 2018

9 S. B. Jo, "A Study on the Optimization of Crankshaft in Diesel Engine" Inha University 1994

10 Y. S. Jung, "A Study on the Management of Lubrication Oil for the Naval vessel Diesel Engines" Korea Maritime and Ocean University 2009

11 H. M. Baek, "A Study on Improvement of Turbocharging System for Performance Improvement of Naval Vessel’s Diesel Engines" Korea Maritime and Ocean University 2018