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RISS 인기검색어
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- 저자 : 박동창(Dong-Chang Park) (검색결과 28 건)
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궤도차량의 Rubber Molded 로드휠 접촉 하중에 대한 Non-Hertzian접촉
박동창(Dong Chang Park),서일성(IL SUNG SEO),최진환(Jin Hwan Choi),강윤수(Yoon Soo Khang) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.4
Suspension systems of the military tracked vehicle consist of roadwheels, roadarms, track links inter-connected by pin and bushing elements, sprockets, and spring-damper force units. Recently the roadwheel of military tracked vehicle is made of aluminum disk which is usually molded with rubber on it. Due to the highly nonlinear characteristics of the rubber, it is complicated to apply realistic load on finite element model of the roadwheel, and it has not been reported an exact loading condition can be used for structural analysis of the roadwheel with any kind of reasonable theoretical background. In this paper, stress analysis of a road wheel of tracked vehicle was presented by using FEM with considering distributed contact loading. A contact area between a roadwheel and base was obtained by means of Non-Hertzian contact theory with friction conditions. This predicted contact area was found out right comparing with empirically measured results.<br/>
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고기동 다물체 궤도차량의 동역한 해석을 접촉 강성 및 강쇠계수에 대한 실험적 연구
박동창(Dong Chang Park),서일성(Il Suang Seo),최진환(Jin Hwan Choi) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.3
An experimental study is presented for the contact property of the interactions between road wheel and track link in order to identify the dynamic characteristics of the high mobility tracked vehicle along the verical direction with loading conditions. The revolving rubber molded track link and road wheels are subjected to the high impulsive contact forces from the ground, and the traction forces from the engine which lead to the tension, compression, and torsional load as the operational conditions and environments. The mechanical characteristics of the track links interconnected by rubber bushings and pins so as to simulate the dynamic analysis of a high mobility multibody tracked vehicle by using empirical methods are also presented. In this investigation, the dynamic and static effects of stiffness and damping coefficients are taken into consideration of the vertical, radial and torsional interations between double pin track links and road wheels. The static and dynamic loadings, and frequency response of these coefficients of track links of high mobility tracked vehicle are represented, respectively.<br/>
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가변노즐의 변위가 제트 엔진의 유동 및 추력특성에 미치는 영향에 관한 수치해석
박준호(Junho Park),손채훈(Chae Hoon Sohn),박동창(Dong Chang Park) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.5
Variable area nozzle, where both throat and exit area vary, is required for optimal expansion and optimal nozzle shape upon operation of after-burner. Steady-state and transient analyses are carried out for each condition with and without afterburner operation and as a function of the location of the nozzle flap. Effects of that nozzle displacement on flow and thrust characteristics are analyzed from numerical results. With variable area nozzle adopted, the combustion field is variable in time, leading to periodically variable thrust. For off-design conditions, flow separation shows up due to over expansion at the flap tips and shock wave does in the nozzle due to under expansion. The undesirable phenomena can be solved by control of variable area nozzle.
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에그-박스 코어 형상 변화에 따른 등가 전단 탄성계수 실험적 연구
이상연(Sang Youn Lee),박동창(Dong Chang Park),윤수진(Su Jin Yun) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.5
본 논문에서 다루고 있는 에그-박스 코어 샌드위치 판넬은 추진기관의 구조체 재료로 사용되고 있다. 무게의 경량화 제작비용/시간을 절감하기 위한 목적으로 에그-박스 코어의 형상 변경의 필요성이 대두되었다. 이번 연구에서는 에그-박스 코어의 등가 전단탄성계수를 평가하기 하여 3 굽힘시험을 수행하였으며, 그 결과로부터 상온에서의 피치 길이 변화에 따른 에그-박스 코어의 등가 전단 탄성계수를 획득하다. 이 결과를 유한요소해석으로부터 얻어진 결과와 비교하였다. The sandwich panel with Egg-box core has been used for the structural element of propulsion system. The alteration on shape of Egg-box core was required to be lighter and save manufacturing time and cost. In this paper, an 3-point bending test is used to evaluate the equivalent shear modulus of the Egg-box core. As a result of the present work, the equivalent shear modulus of Egg-box core according to the variation of pitch length at room temperature can be obtained. And these results are compared with the results of finite element analysis.
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허건수,조병희,서문석,서일성,박동창,Heo, Geon-Su,Jo, Byeong-Hui,Seo, Mun-Seok,Seo, Il-Seong,Park, Dong-Chang 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.6
The track tension is closely related to the maneuverability of tracked vehicles and the durability of tracks and suspension systems. In order to minimize the excessive load on the tracks and to pre vent the peal-off of tracks from the road wheels, it is required to maintain the optimum track tension throughout the maneuver. However, the track tension cannot be easily measured due to the limitation in the sensor technology, harsh environment, etc. In this paper an indirect track tension monitoring system is developed based on idler assembly models, a geometric relation around the idler, and the tractive force estimated by using the Extended Kalman Filter. The performance of the tension monitoring system is verified with the results obtained from the Multi-Body Dynamics model.
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서문석(Mun-suk Suh),박동창(Dong-Chang Park),최진환(JinWhan Choi),이승종(Seungjong Yi),허건수(Kunsoo Huh),윤덕진(Dukjean yun),신장호(Janghoo Shin) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
The mobility of tracked vehicles is mainly influenced by the interaction between tracks and soil, so that the characteristics of their interactions are quite important for the tracked vehicle study. In particular, the track tension is closely related to the maneuverability of tracked vehicles and the durability of tracks and suspension systems. In order to minimize the excessive load on the tracks and to prevent the peaI-off of tracks from the road-wheels, the Dynamic Track Tensioning System (DTTS) which maintains the optimum track tension throughout the maneuver is required. Because it is very difficult to measure the track tension in real-time, the track tension needs to be estimated for realizing the DTTS system. In this paper, track tension estimation methods are validated experimentally with real tracked vehicles. The tracked vehicles are instrumented with severaI sensors including gyro, accelerometer, LVDT, etc. The DSP processor board is programmed with the estimation algorithm and calculates the tension in real-time based on the measured output. The estimated tension is compared with the real tension that is measured by specially prepared DTIS sensors.<br/> <br/>
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