• Title/Summary/Keyword: Parametric Study

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Parametric analysis and torsion design charts for axially restrained RC beams

  • Bernardo, Luis F.A.;Taborda, Catia S.B.;Gama, Jorge M.R.
    • Structural Engineering and Mechanics
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    • v.55 no.1
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    • pp.1-27
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    • 2015
  • This article presents a theoretical parametric analysis on the ultimate torsional behaviour of axially restrained reinforced concrete (RC) beams. This analysis is performed by using a computing procedure based on a modification of the Variable Angle Truss Model. This computing procedure was previously developed to account for the influence of the longitudinal compressive stress state due to the axial restraint conditions provided by the connections of the beams to other structural members. The presented parametric study aims to check the influence of some important variable studies, namely: torsional reinforcement ratio, compressive concrete strength and axial restraint level. From the results of this parametric study, nonlinear regression analyses are performed and some design charts are proposed. Such charts allow to correct the resistance torque of RC beams (rectangular sections with small height to width ratios) to account for the favorable influence of the axial restraint.

Case Analysis Study on 3D printed parametric Fashion Products (3D프린팅 파라메트릭 패션제품 사례분석연구)

  • Ahn, Jin-wook;Jang, Joong-sik
    • Journal of the Korea Convergence Society
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    • v.12 no.12
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    • pp.169-176
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    • 2021
  • This study aims to explore the formativeness of 3D printed parametric fashion products while parametric design-based 3D printed fashion products are increasing. As a research method, theoretical review was conducted and formative properties of 3D printing parametric fashion products were derived, and cases of 3D printing parametric fashion products were collected and examined into three types of clothing, shoes, and accessories. As a result of the study, it was possible to confirm the shape with the motif of a natural object, and structurally, the economical optimal structure, assembly structure, and natural structure were confirmed. was found to use natural and achromatic colors. Through the understanding of the formativeness of 3D printing parametric fashion products presented in this study, it is expected that it will be used as basic data to understand the spread and formative flow of parametric-based fashion products.

A parametric study on fatigue of a top-tensioned riser subjected to vortex-induced vibrations

  • Kim, Do Kyun;Wong, Eileen Wee Chin;Lekkala, Mala Konda Reddy
    • Structural Monitoring and Maintenance
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    • v.6 no.4
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    • pp.365-387
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    • 2019
  • This study aims to provide useful information on the fatigue assessment of a top-tensioned riser (TTR) subjected to vortex-induced vibration (VIV) by performing parametric study. The effects of principal design parameters, i.e., riser diameter, wall thickness, water depth (related to riser length), top tension, current velocity, and shear rate (or shear profile of current) are investigated. To prepare the base model of TTR for parametric studies, three (3) riser modelling techniques in the OrcaFlex were investigated and validated against a reference model by Knardahl (2012). The selected riser model was used to perform parametric studies to investigate the effects of design parameters on the VIV fatigue damage of TTR. From the obtained comparison results of VIV analysis, it was demonstrated that a model with a single line model ending at the lower flex joint (LFJ) and pinned connection with finite rotation stiffness to simulate the LFJ properties at the bottom end of the line model produced acceptable prediction. Moreover, it was suitable for VIV analysis purposes. Findings from parametric studies showed that VIV fatigue damage increased with increasing current velocity, riser outer diameter and water depth, and decreased with increasing shear rate and top tension of riser. With regard to the effects of wall thickness, it was not significant to VIV fatigue damage of TTR. The detailed outcomes were documented with parametric study results.

A Study of Parametric Curve Interpolator in CAD/CAM Ststem (CAD/CAM 시스템에서 매개변수형 곡선본간기에 관한 연구)

  • 김희송
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.4
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    • pp.47-52
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    • 1996
  • The interpolator is very important in CNC machines. This study proposed a parametric curve interpolator(PCI) which can be used for machining any sculptured surface represented in a parametric form and generates commands for tool motion between CAD data points according to given accuracy demands. The proposed interpolator is superior to the existing linear interpolator in accuracy, feed rate and acceleration continuity. Moreover in comparison to the recently developed cubic spline interpolator, the PCI has the capability of handling higher order parametric curves and also ensures precise tracking in the velocity domain. Results from real time simulations and experiments on open architecture CNC machines equipped with the proposed interpolator are presented to show its practical capagility. It is believed that the combination of the proposed interpolator and the open architecture machine controller further advances the area of command generation which is an important aspect of CAD/CAM.

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Semi-parametric Bootstrap Confidence Intervals for High-Quantiles of Heavy-Tailed Distributions (꼬리가 두꺼운 분포의 고분위수에 대한 준모수적 붓스트랩 신뢰구간)

  • Kim, Ji-Hyun
    • Communications for Statistical Applications and Methods
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    • v.18 no.6
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    • pp.717-732
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    • 2011
  • We consider bootstrap confidence intervals for high quantiles of heavy-tailed distribution. A semi-parametric method is compared with the non-parametric and the parametric method through simulation study.

SOME FIXED-POINT RESULTS ON PARAMETRIC Nb-METRIC SPACES

  • Tas, Nihal;Ozgur, Nihal Yilmaz
    • Communications of the Korean Mathematical Society
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    • v.33 no.3
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    • pp.943-960
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    • 2018
  • Our aim is to introduce the notion of a parametric $N_b-metric$ and study some basic properties of parametric $N_b-metric$ spaces. We give some fixed-point results on a complete parametric $N_b-metric$ space. Some illustrative examples are given to show that our results are valid as the generalizations of some known fixed-point results. As an application of this new theory, we prove a fixed-circle theorem on a parametric $N_b-metric$ space.

Parametric Body Model Generation for Garment Drape Simulation

  • Kim, Sungmin;Park, Chang-Kyu
    • Fibers and Polymers
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    • v.5 no.1
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    • pp.12-18
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    • 2004
  • A parametric body model generation system has been developed. Using various mathematic and geometric algorithms of this system, a three-dimensionally scanned human body can be converted into a resizable body model. Once a parametric body model is formed, its size and shape can be modified instantaneously by providing appropriate anthropometric data. To facilitate the subsequent pattern arrangement process for garment drape simulation, a bounding box generation algorithm has been developed in this study. Also the model can be converted into a set of parametric surfaces that it can also be used for three-dimensional garment pattern design system.

PARAMETRIC GENERALIZED MIXED IMPLICIT QUASI-VARIATIONAL INCLUSIONS

  • Park, Jong-Yeoul;Jeong, Jae-Ug
    • Journal of the Korean Mathematical Society
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    • v.44 no.4
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    • pp.889-902
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    • 2007
  • An existence theorem for a new class of parametric generalized mixed implicit quasi-variational inclusion problems is established in Hilbert spaces. Further, we study the behavior and sensitivity analysis of the solution set in this class of parametric variational inclusion problems.

A Parametric Study and an Optimal Design of an ER-SFD Supporting a Rigid Rotor System (강성 회전축계를 지지한 ER-SFD의 parametric study 및 최적설계)

  • 김종립;이남수;이용복;김창호;최동훈
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1999.06a
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    • pp.279-284
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    • 1999
  • This paper presents a parametric study and an optimal design of the ER-SFD supporting a rigid rotor system. An attempt is made to obtain the optimal design of an ER-SFD for a two degree-of-freedom rotor model. Such a simple model is used in order to get a better insight into the physics of the problem, A maximum whirl amplitude, supply pressure and voltage are considered, and a maximum whirl amplitude is minimized over a range of speeds and presented for some values of unbalance mass. The results presented in this paper provide important design information necessary to reduce a whirl amplitude of an ER-SFD.

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Parametric Study on the Joint Strength of Unidirectional and Fabric Hybrid Laminate (일방향-평직 복합재 혼합 적층판의 기계적 체결부 강도에 관한 인자연구)

  • 안현수;신소영;권진회;최진호;이상관;양승운
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.05a
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    • pp.9-12
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    • 2002
  • A parametric study has been conducted to investigate the effect of the geometry on the strength of an unidirectional and fabric hybrid laminated composite joint. Tests are conducted for the specimens with nine different edge-to-hole diameter or width-to-hole diameter ratios. For the finite element analysis, the characteristic length method is used, and the tests for determining the characteristic length are performed additionally. Nonlinear contact problem between the pin and laminate is modeled by the gap element in MSC/NASTRAN. Tsai-Wu failure criteria is applied to the stress on the characteristic curve. The finite element and experimental results shows good agreement in strength of composite joint. Results of the parametric study shows the effect of the geometry is remarkable in the specimens with width-to-hole diameter ratio less than 2.8 and edge-to-hole diameter ratio less than 1.4.

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