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음의 각을 가지는 허니컴 스포크를 사용한 비 공압타이어의 접지압 분포
김광원,김두만,Kim, Kwangwon,Kim, Dooman 항공우주시스템공학회 2010 항공우주시스템공학회지 Vol.4 No.2
An airless tire has advantages over the conventional pneumatic tire in terms of flat proof and maintenance free. According to the recently disclosed inventions on the airless tire, non-pneumatic tire (NPT) consists of the flexible polygon spokes. Considering the NPT structure, the spokes undergo the tension-compression cyclic loading while the tire rolls. Therefore the spokes of NPT are required to have both stiffness and resilience under the cyclic tensile-compressible loading. In general, if a material has a high stiffness, it shows a low elastic strain limit. In this paper, using the auxetic honeycomb structure with negative poissons's ratio, the spokes of NPT tire are designed to have both stiffness and resilience. Finite element based numerical simulation of the contact pressure of a NPT is carried out with ABAQUS.
윤성찬,이재홍,허현우,유새롬,김두만,Yun, Sungchan,Lee, Jaehong,Heo, Hyeonu,You, SaiRom,Kim, Dooman 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.3
The Airship which uses light gases(Helium) can afford to be managed safely, and economically. In this paper, it executed Airship aerodynamic design using Theory of the Airship shape. With the change of main design factor, aerodynamic coefficients were investigated by FLUENT and the shape of the Airship which has low drag was chosen. For low drag coefficient of the Airship, the theory of traditional Airship shape was used. The structural analysis of the Airship is executed by ANSYS.
윤성찬,허현우,유새롬,이재홍,김두만,오장근,이희우,Yun, Sungchan,Hu, Hyenoo,You, Saerom,Lee, Jaehong,Kim, Dooman,Oh, Janggeun,Lee, Heewoo 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.1
The 1st development of "Human Powered Aircraft(HPA)" in Korea has been conducting by KAFA(Korea Air Force Academy) from Aug. 2008 to now. HPA is an aircraft powered by directly human energy. The thrust provided by the human power may be the only source and that is weak. Therefore, light weight and strong structure is first requirement. In this paper, treating a basic conceptual design of HPA and material property and material choice for HPA. Also analysing the structure and checking the safety of HPA.
유한요소 해석을 이용한 파괴 하중에서 추간판의 응력상태 해석
유새롬(SaiRom Yoo),김두만(DooMan Kim),김진규(JinKyu kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Failure in a state of the intervertebral disk did not measure the stress state, because stress of intervertebral disk under failure load is difficult to study experimentally. In this paper, finite element analysis with ABAQUS is used for failure stress of intervertebral disk evaluation. According to the results of FEM analysis about human intervertebral disk under the failure load conditions, maximum stress(93 MPa) is occurred at intervertebral disk edge.
[타이어운동특성부문] X-ray영상을 이용한 PCR Tire Belt 시편의 층간전단변형율에 관한 실험적 연구
유현승(Hyungseung Yoo),박인정(Injeong Park),김두만(Dooman Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In this paper, interlaminar (interply) shear strains on the inner area of tire belt specimens were measured from images, which were taken by X-ray with experimental setup under the uniaxial extension loading. The effects of cord angle and specimens width were studied. Also, the measured results were compared with theoretical analysis. In view of qualitative analysis, good agreements were shown between experiment and theory, but some differences were shown in the quantitative analysis.
[타이어운동특성부문] 내압 및 수직하중을 받는 레디얼 타이어 카카스의 변형율에 관한 연구
박인정(Injeong Park),유현승(Hyunseung Yoo),성경진(Kyoungjin Seong),김두만(Dooman Kim),구본희(Bonhee Ku),심현우(Hyunwoo Shim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In this paper, carcass strain on the sidewall of radial tire were measured by using the strain gage and compared with the results of finite element analysis. Nonlinear behavior of tire sidewall must be considered for the analysis of tire strain with inflation pressure. On calculating the inflation strain of carcass, material nonlinearity is essential.
히스테리시스 거동을 하는 탄성체의 비선형 점탄성 구성방정식
유새롬(Sairom Yoo),주재형(Jaehyung Ju),최석주(Seok-Ju Choi),김두만(Dooman Kim) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.4
정확한 점탄성 재료의 히스테리시스 모델은 에너지 손실을 정량화 하는데 매우 중요하다. 우리는 본 논문에서 대변형 상태의 탄성체에 대한 비선형 초-점탄성 지배방정식 모델을 제시하고자 한다. 본 연구는 Hoofatt의 모델에서 Neo-Hookean 초탄성 모델 대신 Yeoh 초탄성 모델로 지배 방정식을 유도하여 탄성체의 점탄성 거동을 모델링하였다. 또한 폴리우레탄 시편을 사용하여, 평균 변형률 εm=1.5, 진폭 변형률 εα=0.2~0.8, 주파수 f=0.02~0.2의 조건에서 단축 사인형 반복 하중 실험과 제시한 점탄성 모델을 Matlab으로 비교하였다. 본 연구의 점탄성 모델은 변형률이 230% 이상의 대변형 상태의 에너지 손실도 계산할 수 있다. An accurate hysteresis model of an elastomer is important for quantifying viscoelastic energy loss. We suggest a highly nonlinear hyper-viscoelastic constitutive model of elastomers. The model captures a nonlinear viscoelastic characteristic by combining Yeoh’s hyperelastic model and Hoofatt’s hysteresis model used Neo-Hookean hyperelastic model. Analytical and numerical models were generated from uniaxial cyclic tests of an elastomer under a sinusoidal load with a mean strain of 150%, amplitudes of 20~80%, and frequencies of 0.02~0.2㎐. The viscoelastic model can highly capture the viscoelastic energy loss up to a strain of 230%.