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주조 알루미늄합금 A356을 사용한 해상구조물의 진동피로수명평가
김지억(Jie-Eok KIM),양성철(Sung-Chul Yang),정화영(Hwa-Young Jung),조기대(Ki-Dae Cho),강기원(Ki-Weon Kang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
함정구조물은 함내 엔진 및 프로펠러 추진력의 환경진동에 노출되어 있다. 일반적으로 함상구조물은 함상진동규격인 MIL-STD-167-1A에 따라 개발되고 있으며, 장기간 사용을 목적으로 하는 함상구조물의 진동에 대한 피로수명은 해석적 접근법과 진동실험을 통해 반드시 평가되야 한다. 본 논문에서는 함상구조재로 사용된 주조 알루미늄합금인 A356의 피로강도를 14 S-N 법으로 평가하고, 구조물의 작용응력은 함상진동규격에 준하는 주파수응답해석을 수행하였다. 최대등가응력의 주파수는 최대실험주파수에서 나타났으며, 함상장비의 진통피로수명은 누적손상법에 의해 평가되었다. The naval structure exposes to environmental vibration of shafted propeller propulsion and engine vibration. In generally, shipboard equipments are developed compliance to MIL-STD-167-1A. For this purpose, vibration fatigue life of shipboard equipment for long lives should be estimate an analytical approach and vibration test. In this paper, High cycle fatigue strength of cast aluminum alloy A356 using shipboard equipment was evaluated by 14 S-N method. The applied stress of structure analyzes an analytical approach (frequency response analysis with sinusoidal input and a fatigue evaluation) to simulate a MIL-STD-167-1A test. The frequency with the maximum equivalent stress is shown by Max. test frequency and the vibration fatigue life of shipboard equipment was estimated by Miner's rule.
주조 알루미늄합금 A356 을 사용한 해상구조물의 진동피로수명평가
조기대(Ki-Dae Cho),김지억(Jie-Eok KIM),양성철(Sung-Chul Yang),정화영(Hwa-Young Jung),강기원(Ki-Weon Kang) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.9
함정구조물은 함내 엔진 및 프로펠러 추진력의 환경진동에 노출되어 있다. 일반적으로 함상구조물은 함상진동규격인 MIL-STD-167-1A 에 따라 개발되고 있으며, 장기간 사용을 목적으로 하는 함상구조물의 진동에 대한 피로수명은 해석적 접근법과 진동실험을 통해 반드시 평가되야 한다. 본 논문에서는 함상구조재로 사용된 주조 알루미늄합금인 A356 의 피로강도를 14 S-N 법으로 평가하고, 구조물의 작용응력은 함상진동규격에 준하는 주파수응답해석을 통해 분석되었다. 최대등가응력의 주파수는 최대실험주파수에서 나타났으며, 함상장비의 진동피로수명은 누적손상법에 의해 평가되었다. The naval structure exposes to environmental vibration of shafted propeller propulsion and engine vibration. The shipboard equipments are developed compliance to MIL-STD-167-1A. For this purpose, vibration fatigue life of shipboard equipment for long lives should be estimate via an analytical approach and vibration test. In this paper, High cycle fatigue strength of cast aluminum alloy A356 using shipboard equipment was evaluated by 14 S-N method. The stress applied on the structure is evaluated by an analytical method(frequency response analysis with sinusoidal input and a fatigue evaluation) to simulate a MIL-STD-167-1A test. The frequency with the maximum equivalent stress is shown by Max. test frequency and the vibration fatigue life of shipboard equipment was estimated by Miner’s rule.
Quality Function Deployment(QFD)와 Analytic Hierarchy Process(AHP)를 이용한 유도무기의 시스템 요구도 분석
노경호,황성환,이기승,강동석,김지억,Noh, Kyung-Ho,Hwang, Sung-Hwan,Lee, Ki-Seung,Kang, Dong-Seok,Kim, Ji-Eok 한국시스템엔지니어링학회 2009 시스템엔지니어링학술지 Vol.5 No.1
User Requirements are analyzed and quantified by decision making models and system engineering methods to select alternative concepts which satisfy the various requirements. In this study, the design concepts for guided missile are derived using Quality Function Deployment(QFD) and Analytic Hierarchy Process(AHP). The design alternatives that satisfy the user requirements are extracted by QFD and Morphological Matrix, then the best design concept are obtained using AHP and Pugh concept Selection.
A356-T6를 사용한 함상구조물의 피로강도에 대한 신뢰성평가
정화영(Hwa-Young Jung),김지억(Jie-Eok Kim),조기대(Ki-Dae Cho),권용규(Yong-Kyu Kwon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The naval structure exposes to a variety of natural and man-made environments during its operational life. Reliability analysis of naval structure designed for long lives should be estimate the fatigue strength at long fatigue lives. For this purpose, the applied stress of structure under the variable service conditions needs to be considered. The fatigue strength of A356-T6 under axial load condition was evaluated by staircase method at stress ratio R=O.1. The fatigue strength at 2.0E6 cycles was estimated by Weibull distribution and compared with load conditions. The reliability of naval structure for long lives was obtained by the strength-stress interference model.