• Advances in aircraft and spacecraft science
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• v.5 no.6
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• pp.653-669
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• 2018

This work has the objective to analyze multibody mechanisms of inflatable structures for manned space applications. The focus is on the evaluation of the main characteristics of MaxFlex, a new module of MSC Adams including the effect of nonlinear flexible bodies. MaxFlex integrates the nonlinear Finite Element Analysis (FEA) of Nastran-SOL400-and the Adams multibody capabilities in one unique solver, providing an improvement concerning the concept and technology based on the co-simulation among solvers. MaxFlex converts the equations of motion of the nonlinear FEA into phase-space form and discretizes them according to the multibody system integrator framework. The numerical results deal with an inflatable manned space module having rigid components and a flexible coating made of Kevlar. This paper is a preliminary assessment of the computational capabilities of the software and does not provide realistic guidelines for the actual design of the structure. The analysis leads to some recommendations related to the main issues to consider in a nonlinear simulation including both rigid and flexible components. The results underline the importance of realistic deployment times and applied forces. Also, a proper structural modeling is necessary, but can lead to excessive computational overheads.

• Journal of the Korean Society of Propulsion Engineers
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• v.9 no.4
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• pp.73-80
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• 2005

In general, the performance of movable nozzle used for thrust vector control in solid rocket motor is estimated on the basis of the effective pivot of nozzle. However, it is nearly impossible to define the exact effective pivot by the mathematical model or experimental technique owing to pivot dynamics. In this paper, pivot dynamic properties were investigated by ADAMS simulation technique and trajectory of the exact effective pivot was modelled by the artificial neural network. Comparison of the proposed method was made with the virtual movable nozzle (computer simulation) to verify the method, and showed good agreement. Therefore, the proposed method will be applicable to predict the effective pivot of movable nozzle during bench or ground test.

• The Korean Journal of Malacology
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• v.20 no.2
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• pp.141-154
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• 2004

Ovulid species were collected during the period from 1998 to 2004 years at six localities of Korean coastal area. Ovulidae in Korea was classified as 27 spacies in 11 genera. Twenty two species among them have never been reported in Korean fauna; Habuprionovolva hervieri (Hedley, 1989), Prionovolva brevis (Sowerby, 1828), P. pudica pudica (A. Adams, 1855), P. bulla (Adams & Reeve, 1848), Dentiovula colobica (Azuma & Cate, 1971), Pseudosimnia (Diminovula) punctata (Duclos, 1831), Pseudosimnia (Inflatovula) culmen (Cate, 1973), Aperiovula allynsmithi Cate, 1978, Primovula (Primovula) tigris Yamamoto, 1971, Crenovolva (Cuspivolva) cuspis Cate, 1073, Phenacovolva (Phenacovolva) Iahainaensis (Cate, 1969), P.(P.) subreflexa (Adams & Reeve, 1848), P.(P.) improcera(Azuma & Cate, 1971), P.(P.) weaveri Cate, 1973, P.(P.) poppei Fehse, 2001, Phenacovolva (Turbovula) brevirostris (Schumacher, 1817), P.(T.) fusula Cate & Azuma, 1973, P.(T.) dancei Cate, 1973, P.(T.) hirasei (Pilsbry, 1913), Phenacovola (Calcarrovula) longirostrata (Sowerby, 1828), P.(C.) tokioi Cate, 1973, and Volva volva habei Oyama, 1961.

• Transactions of the Korean Society of Automotive Engineers
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• v.14 no.2
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• pp.1-8
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• 2006

In this paper, an optimum design technology is developed to find an optimal position of the shock absorber using ADAMS and VisualDOC. A vehicle with a torsion-beam rear suspension is modeled by using ADAMS. Design variables for the optimal positioning of the shock absorber are defined considering the hard points of the chassis structure and design positioning are specified through the sensitivity analysis using a bump-crossing simulation. The objective function is defined as the joint reaction forces of the shock absorber connecting joints of the chassis structure. Sequential Quadratic Programming and Genetic Algorithms are used for this study. To validate the optimized design variables, pothole simulations are performed. GA showed better results than SQP algorithms for this design purpose.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.12 no.3
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• pp.133-141
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• 2007

A finite element model is developed for the extended Boussinesq equations that is capable of simulating the dynamics of long and short waves. Galerkin weighted residual method and the introduction of auxiliary variables for 3rd spatial derivative terms in the governing equations are used for the model development. The Adams-Bashforth-Moulton Predictor Corrector scheme is used as a time integration scheme for the extended Boussinesq finite element model so that the truncation error would not produce any non-physical dispersion or dissipation. This developed model is applied to the problems of solitary wave propagation. Predicted results is compared to available analytical solutions and laboratory measurements. A good agreement is observed.

• Bulletin of the Korean Mathematical Society
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• v.14 no.1
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• pp.17-25
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• 1977

• Information Display
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• v.2 no.1
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• pp.52-69
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• 2001

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2003.10a
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• pp.211-233
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• 2003

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2002.05a
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• pp.71-83
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• 2002

• Journal of the Korean Chemical Society
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• v.8 no.3
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• pp.131-133
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• 1964