• Journal of Aerospace System Engineering
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• v.8 no.1
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• pp.18-23
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• 2014

This thesis is simulated a aircraft nose landing gear drop-test. flow rate-to-pressure difference characteristics of damping orifices for a nose landing gear is investigated by CFD analyses. Orifice is kind of poppet valve type. it is simulated pressure drop with variable orifice area. it is simulated landing gear model by using ADAMS with CFD result. It's performance evaluated landing gear drop-test and analyzed the results.

• Transactions of the Korean Society of Automotive Engineers
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• v.14 no.3
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• pp.51-57
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• 2006

The contact pressure distribution between a rubber wiper blade and a glass windshield is a major factor for wiping performance. A modeling and simulation method has been developed to forecast the contact pressure distribution on a wiper blade. For modeling multi-body dynamics of an wiper linkage system and flexible nature of wiper blade, ADAMS and ADAMS/flex are employed. A simulation study has been also conducted to obtain contact pressure distribution. Comparison between simulation and measurement is provided to ensure fidelity of the model and the simulation method.

• Journal of Aerospace System Engineering
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• v.2 no.1
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• pp.1-6
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• 2008

In this paper, full body modeling and analysis of nose and main landing gear's characteristics of a helicopter are performed using the dynamics analysis program ADAMS. Also, when land limiting about helicopter body's degree-of-freedom, compared the characteristics. In the case of helicopter, because there are a lot of dangerous missions under flight condition that is disadvantageous than fixed wing airplane, need more detailed research for a helicopter.

• Korean Journal of Computational Design and Engineering
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• v.7 no.1
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• pp.1-8
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• 2002

A Hotchkiss spring has been widely utilized for commercial vehicle. Usually, the Hotchkiss spring has non-linear characteristics, i.e. it has a piecewise spring stiffness as well as hysterisis phenomenon. Therefore, the modeling of the Hotchkiss spring requires many considerations to fulfill satisfactory vehicle kinematic and dynamic relationships. Also, the spring has difficulties in modeling for presenting contact mechanism. In this paper, the modeling technique for the Hotchkiss spring has been descried. The modeling covers non-linear characteristics as well as contact problems for multi-body dynamic simulation. The force-displacement results are compared with experimental and FEM ones. Also, the comparison between three link type leaf spring model and proposed one has been considered in this paper.

• Annual Conference of KIPS
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• 2002.04a
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• pp.427-430
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• 2002

기존의 2 Tier나 3 Tier형태의 소프트웨어 개발 시 생산성과 효율성을 향상시키기 위하여 RAD Tool을 많이 사용하였다. 이러한 RAD Tool의 사용은 생산성과 효율성을 향상 시켰지만 소프트웨어의 유지보수나 성능 개선을 위한 작업 시 코드의 중복이나 복잡성 등의 증가 등 많은 문제점들을 발생되었으며, 이는 소프트웨어의 유지보수에 많은 문제점을 가져왔다. 이러한 문제점들은 역공학 기법을 통해서 해결이 가능하다. 역공학 기법을 이용하여 소프트웨어의 구조를 이해할 수 있는 정보를 추출하고 추출된 정보를 체계적으로 관리할 수 있는 시스템을 구축하여 문서화하는 것이다. 이에 본 논문에서는 소프트웨어의 소스코드를 분석하여 시스템 변경 등의 작업 시 문서화를 지원하여 생산성과 효율성을 증가시킬 수 있는 시스템을 설계 구현하였다.

• Journal of the Korean Society of Propulsion Engineers
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• v.13 no.4
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• pp.30-35
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• 2009

Effective-pivot effects on the thrust vector control performance of the flexible seal nozzle to be used to control the flight direction of missile were investigated by computer simulation. $2^3$-Design of experiment technique was applied and ADMAS was used for the surrogate technique. As a result, radial pivot position had more influence upon the nozzle actuating performance than axial pivot position. Connecting method of actuator was also important factor in determining effective-pivot effects on the thrust vector control performance of the flexible seal nozzle.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.19 no.4
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• pp.582-588
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• 2010

This paper presents the Application of Response Surface Method for Optimal Transfer Conditions of MLCC Alignment System. his paper is composed of two parts: (1) Testing performance verification of MLCC alignment system, compared with manual operation; (2) Applying response surface method to figuring out the optimal transfer conditions of MLCC transfer system. Based on the successfully developed MLCC alignment system, the optimal transfer conditions have been explored by using RSM. The simulations using $ADAMS^{(R)}$ has been performed according to the cube model of CCD. By using $MiniTAB^{(R)}$, we have established the model of response surface based on the simulation results. The optimal conditions resulted from the response optimization tool of $MiniTAB^{(R)}$ has been verified by being assigned to the prototype of MLCC alignment system.

• Animal Systematics, Evolution and Diversity
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• v.8 no.1
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• pp.69-88
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• 1992

The present study on the classification and description of the marin Neogastropoda and Basommatophora was based on the materials which were collected during the period from 12 th to 17 th of July in 1989 at ten localities of Ullng Island , Korea. All of 7 families and 19 species were reported including the 16 unrecorded species from the Ullng Island as a result of this study. Among them, 3 species [Zafrona (Clathranachis) japonica (A.Adams , 1860), Enzinopsis menkeana (Dunker, 1860) and Pollia mollis, (Gould, 1860)] were new to the fauna of Korea.

• Journal of Aerospace System Engineering
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• v.6 no.2
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• pp.13-17
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• 2012

In this study the flow rate-to-pressure difference characteristics of short-tube type damping orifices for a aircraft door damper were investigated by CFD analyses. For the verification of the CFD analysis results the actual performance of a door damper was measured and compared with them. and The dynamic response of door damper is Simulated using ADAMS. it's performance is evaluated comparing to the experiment result of door damper.

• Journal of the Korean Society for Railway
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• v.7 no.3
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• pp.259-263
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• 2004

The running safety of a railway vehicle depends on the design parameters and contact condition between wheel and rail. In this study, the effect of the conicity of wheel tread is analyzed using ADAMS/RAIL software on running situation. Modal analysis shows in 0.6 Hz natural frequency of lateral mode in fully arranged the KTX cars. The excessive vibration of the tail cars occurs in the 17th car as the speed and the stiffness of the secondary suspension increases, and especially for 1/40 conicity of the GV40 wheel. Also, the analysis shows that combination of wheel profile, GV40 for power cars and XP55 for passenger cars can reduce the lateral vibration of the tail cars.