The center bearing of the propeller shaft in the KM-Sam mounted vehicle is a component that requires high durability due to high-speed rotation and it must exhibit strong resistance to vibration and strees. However some Republic of Korea Air Force (ROKAF) units have experienced failures where the center bearing bracket breaks, leading th the detachment of the propeller shaft assembly. This issue has only occurred with domestically developed center bearings, A root cause analysis confirmed excessive second-order components and stress, Therefore improved results were derived through comparative testing with imported parts, and the effectivenss was verified by applying them to actual vehicles.

Abstract
1. 서 론
2. 실험 조건
    2.1 OA(Order Analysis)
    2.2 Strain Gauge 응력
    2.3 주행 도로 조건
3. 실험 과정
    3.1 원인 분석
    3.2 개선 방법
4. 결 론
References

• 배성주(Defense Agency for Technology and Quality) | Sungju Bae Corresponding author
• 김선진(Defense Agency for Technology and Quality) | Seon-jin Kim
• 오창영(Defense Agency for Technology and Quality) | Changyoung Oh
• 최창익(Defense Agency for Technology and Quality) | Changik Choi
• 서주현(Kia Corporation) | JuHyun Seo