• Title/Summary/Keyword: Load Carrying Capability

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A Study on Side Impact Simulation Technique using Simple Beam Model (단순 보모델을 이용한 측면충돌 해석기술 연구)

  • 강성종
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.5
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    • pp.170-177
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    • 1997
  • In this study, an analysis technique using simple beam model for predicting structure crashworthiness of the passenger car side impacted with an angle by another passenger car was investigated. The simple model was composed of major beam-like side structure which carry almost all side impact load. A procedure of component collapse test, calculation of load carrying capability and dynamic simulation was carryed out sequentially. Transient dynamic algorithms and a computer program to simulate deformations and motions of the impacted car was developed. The developed procedure was applied to a 3 door passenger car side impacted with an angle of 75 degree and the analysis results show good agreements with the actual test results.

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Bending Collapse Characteristics of Hat Section Beam Filled with Structural Foam (폼 충진 모자단면 빔의 굽힘붕괴 특성)

  • Lee, Il-Seok;Kang, Sung-Jong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.2
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    • pp.92-99
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    • 2006
  • Design capability for high safety vehicle with light weight is crucial to enhancing competitive power in vehicle market. The structural foam can contribute to restraining section distortion in body members undergoing bending collapse at vehicle crash. In this study, first, the validation of analysis model including structural foam model for simulating fracture behavior was discussed, and the bending collapse characteristics of five representative section types were analyzed and compared. Next, with changing the laminate foam shape, load carrying capability and absorbed energy were observed. The results suggests a design strategy of body members filled with laminate foam, leading to effectively elevating bending collapse characteristics with weight increase in the minimum.

Analysis of Capacity Factors and Capacity Credits for Wind Turbines Installed in Korea (국내 풍력발전 설비의 이용률과 용량크레딧 분석)

  • Paik, Chunhyun
    • Journal of the Korean Solar Energy Society
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    • v.39 no.4
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    • pp.79-91
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    • 2019
  • The capacity credit (CC) is a key metric for mid- to long-term power system capacity planning. The purpose of this study is to estimate the CCs of domestic wind turbines. Based on hourly capacity factor (CF) data during the seven years from 2011 to 2017, the new so-called probabilistic CF scheme is introduced to effectively reflect the variability of CFs on CC estimation. The CCs are then estimated through the CF-based method and the ELCC (Effective Load Carrying Capability) method reflecting the probabilistic CF scheme, and the results are compared. The results show that the CC value 0.019 for domestic wind turbines proposed in the $8^{th}$ Basic Plan for Electricity Supply and Demand corresponds to the CC with a confidence level slightly lower than 95%.

Numerical Investigation of Load Carrying Capacity of Geogrid-Encased Stone Columns under Foundation Load (구조물 기초하중 작용시 지오그리드 보강 쇄석말뚝의 하중지지 특성에 관한 수치해석 연구)

  • Yoo, Chung-Sik
    • Journal of the Korean Geotechnical Society
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    • v.25 no.11
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    • pp.75-86
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    • 2009
  • This paper presents the results of a numerical investigation on load carrying capacity of geogrid-encased stone columns to use as load carrying column(s) supporting a foundation load. A validated 3D stress-pore pressure coupled model that can effectively show rapid drainage capability of stone columns and encasement effect of geogrid was adopted and a parametric study was carried out on a number of influencing factors. It is shown that the geogrid encased stone columns can be effectively used as foundation load supporting columns in soft ground. The results of numerical investigation were presented so that the relationship between the load carrying capacity of geogrid-encased stone columns and the influencing factors can be identified. Practical implications of the findings are also discussed.

Advanced performance evaluation system for existing concrete bridges

  • Miyamoto, Ayaho;Emoto, Hisao;Asano, Hiroyoshi
    • Computers and Concrete
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    • v.14 no.6
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    • pp.727-743
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    • 2014
  • The management of existing concrete bridges has become a major social concern in many developed countries due to the large number of bridges exhibiting signs of significant deterioration. This problem has increased the demand for effective maintenance and renewal planning. In order to implement an appropriate management procedure for a structure, a wide array of corrective strategies must be evaluated with respect to not only the condition state of each defect but also safety, economy and sustainability. This paper describes a new performance evaluation system for existing concrete bridges. The system evaluates performance based on load carrying capability and durability from the results of a visual inspection and specification data, and describes the necessity of maintenance. It categorizes all girders and slabs as either unsafe, severe deterioration, moderate deterioration, mild deterioration, or safe. The technique employs an expert system with an appropriate knowledge base in the evaluation. A characteristic feature of the system is the use of neural networks to evaluate the performance and facilitate refinement of the knowledge base. The neural network proposed in the present study has the capability to prevent an inference process and knowledge base from becoming a black box. It is very important that the system is capable of detailing how the performance is calculated since the road network represents a huge investment. The effectiveness of the neural network and machine learning method is verified by comparing diagnostic results by bridge experts.

A Study on the Torque Transmitting Capability of a Disk Coupling by Finite Element Analysis (유한요소해석을 이용한 디스크 커플링의 토크전달 능력에 대한 연구)

  • Seo, Won Sang;Kim, Sung Muk;Kim, Jong-Bong
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.11
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    • pp.1171-1177
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    • 2013
  • In this study, the torque transmitting capability of a flexible disk coupling was investigated. Flexible disc coupling is used to transmit power between two axes, and there exist mis-alignments such as angle of deviation and end play between two shafts. A disk is an important part in the flexible disk coupling because the disk has to transmit power between two mis-aligned shafts. To investigate the effect of mis-alignment on load carrying capacity, finite element analyses were carried out. Analyses were carried out for two types of disk; i.e., circular and square disks. The rotational and bending stiffness of disk plates was predicted to investigate the effect of mis-alignment on stress. As a result, it was shown that the mis-alignment can cause severe decrease in load-carrying capacity. And, the square disk showed better performance than the circular disk.

Foam Filling Effect on Bending Collapse Characteristics for Member Section Type (부재단면 형상에 따른 부재 굽힘붕괴 특성의 폼 충진 효과)

  • Lee, Il-Seok;Kang, Sung-Jong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.2
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    • pp.41-49
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    • 2007
  • More diversified and strengthened safety regulations require higher safety vehicle with less weight. The structural foam can play a role for restraining section distortion of main body members undergoing bending collapse at vehicle crash. In this study, using structural foam modeling technology, validated in previous work, the bending collapse characteristics were evaluated for two types of circular and actual vehicle body frame sections. With changing the foam filling method, outer panel thickness and section shape, load carrying capability and absorbed energy were observed. The results indicate valuable design strategy for effectively elevating bending collapse performance of body members with foam filled.

Maintenance Scheduling with Considering Load Forecast Uncertainty (수요예측의 불확실성을 고려한 발전기의 정기 보수계획수립)

  • Song, K.Y.;Cha, J.M.;Oh, K.H.;Jung, M.H.;Kim, Y.H.
    • Proceedings of the KIEE Conference
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    • 1995.07b
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    • pp.562-564
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    • 1995
  • This paper proposes a new algorithm for maintenance scheduling with considering load forecast uncertainty. The proposed algorithm is based on the equivalent load of effective load carrying capability(ELCC) of generators. The uncertainty of forecasted load is considered as a normal distribution probability density function. For maintenance scheduling, reserve levelization method and risk levelization method are used in this study. To test the algorithm, we applied the proposed method to IEEE reliability test system(IEEE RTS). As a result, we verified the validity of the proposed method.

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Lubrication Effect of Journal Bearing according to its Eccentricity and Attitude Angle (베어링 편심도와 자세각에 따른 저어널 베어링의 윤활효과)

  • Kim, Jong-Do;Wang, Yi-Jun;Yoon, Moon-Chul
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.5
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    • pp.88-95
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    • 2015
  • The thickness of adsorbed molecular layers is the most critical factor in studying thin-film lubrication, and it is the most essential parameter that distinguishes thin-film from thick-film lubrication analysis. The thin film between the shaft and bearing surface within a very narrow gap was considered. The general Reynolds equation has been derived for calculating thin-film lubrication parameters affecting the performance of the circular journal bearing. Investigation of the load-carrying capacity and pressure distribution for the journal bearing considering the adsorbed layer thickness has been carried out. A Reynolds equation appropriate for the journal bearing is used in this paper for the analysis, and it is discussed using the finite difference method of the central difference scheme. The parameters, such as eccentricity and attitude angle, are used for discussing the load-carrying capacity of the journal bearing. The results reported in this paper should be applied to analysis of the journal bearing with different lubrication factors. The steady-state analysis of the journal bearing is conducted using the Reynolds model under thin-film lubrication conditions. For a journal bearing, several parameters, such as a pressure, load capacity, and pressure components of the bearing can be obtained, and these results can be stored in a sequential data file for later analysis. Finally, their distribution can be displayed and analyzed easily by using the MATLAB GUI technique. The load-carrying capability of the journal bearing is observed for the specified operating conditions. This work could be helpful for the understanding and research of the mechanism of thin-film lubrication.

Study on the High Rate Shear Deformation of a Carbon/Epoxy Composite (Carbon/Epoxy 복합재의 고속변형 특성 연구)

  • 최재호;박인서;이성호;송흥섭
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2003.04a
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    • pp.99-102
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    • 2003
  • Carbon/Epoxy composite specimens formed with buttress groves are fabricated. The buttress form of groove is useful in any application where high shear loads are transferred in one direction between structural components. It is a primary object of the present study to test and evaluate the shear load carrying capability of a carbon/epoxy composite structure with buttress grooves for military applications

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