• 제목/요약/키워드: two-hybrid analysis

검색결과 762건 처리시간 0.025초

Investigation on mechanics performance of cable-stayed-suspension hybrid bridges

  • Zhang, Xin-Jun
    • Wind and Structures
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    • 제10권6호
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    • pp.533-542
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    • 2007
  • The cable-stayed-suspension hybrid bridge is a cooperative system of the cable-stayed bridge and suspension bridge, and takes some advantages and also makes up some deficiencies of both the two bridge systems, and therefore becomes strong in spanning. By taking the cable-stayed-suspension hybrid bridge, suspension bridge and cable-stayed bridge with main span of 1400 m as examples, the mechanics performance including the static and dynamic characteristics, the aerostatic and aerodynamic stability etc is investigated by 3D nonlinear analysis. The results show that as compared to the suspension bridge and cable-stayed bridge, the cable-stayed-suspension hybrid bridge has greater structural stiffness, less internal forces and better wind stability, and is favorable to be used in super long-span bridges.

ANALYSIS OF PLANETARY GEAR HYBRID POWERTRAIN SYSTEM PART 1: INPUT SPLIT SYSTEM

  • Yang, H.;Cho, S.;Kim, N.;Lim, W.;Cha, S.
    • International Journal of Automotive Technology
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    • 제8권6호
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    • pp.771-780
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    • 2007
  • In recent studies, various types of multi mode electric variable transmissions of hybrid electric vehicles have been proposed. Multi mode electric variable transmission consists of two or more different types of planetary gear hybrid powertrain system(PGHP), which can change its power flow type by means of clutches for improving transmission efficiencies. Generally, the power flows can be classified into three different types such as input split, output split and compound split. In this study, we analyzed power transmission characteristics of the possible six input split systems, and found the suitable system for single or multi mode hybrid powertrain. The input split system used in PRIUS is identified as a best system for single mode, and moreover we identified some suitable systems for dual mode.

A Hybrid Coordinate Partitioning Method in Mechanical Systems Containing Singular Configurations

  • Yoo, Wan-Suk;Lee, Soon-Young;Kim, Oe-Jo
    • 한국철도학회논문집
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    • 제5권3호
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    • pp.174-180
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    • 2002
  • In multibody dynamics, DAE(Differential Algebraic Equations) that combine differential equations of motion and kinematic constraint equations should be solved. To solve these equations, either coordinate partitioning method or constraint stabilization method is commonly used. The most typical coordinate partitioning methods are LU decomposition, QR decomposition, and SVD(singular value decomposition). The objective of this research is to suggest a hybrid coordinate partitioning method in the dynamic analysis of multibody systems containing singular configurations. Two coordinate partitioning methods, i.e. LU decomposition and QR decomposition for constrained multibody systems, are combined for a new hybrid coordinate partitioning method. The proposed hybrid method reduces the simulation time while keeping accuracy of the solution.

재료비선형을 고려한 일방향-평직 혼합 적층 복합재 체결부의 점진적 파손해석 (Progressive Failure Analysis of UD-Fabric Hybrid Laminated Composite Joints Considering Material Nonlinearity)

  • 최정석;신소영;안현수;권진회
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2002년도 추계학술발표대회 논문집
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    • pp.79-82
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    • 2002
  • A finite element method based on the two-dimensional progressive failure analysis considering material nonlinearity is presented for characterizing the strength and failure of the unidirectional-fabric hybrid laminated composite joints under pin loading. The 8-node laminated shell element is incorporated in the updated Lagrangian formulation. Failure criteria including the Maximum Stress and Tsai-Wu are used in conjunction with the complete unloading stiffness degradation method. For the verification, joint tests are conducted for the specimens with two different ply-number ratios of UD composite to fabric composite. Although there are some differences depending on ply-number ratios, the finite element model using the maximum stress criterion considering nonlinear material behavior predicts the failure strength best.

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패션의류시장에 있어서 하이브리드 마케팅 경로 관리 연구 (Managing Hybrid Marketing Channels for Fashion Apparel Industry(in Korea))

  • 손상기;권순기
    • 국제지역연구
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    • 제12권3호
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    • pp.89-109
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    • 2008
  • 마케팅 경로 관리에 있어서 하이브리드 경로를 활용할 때는 경로 통제 잇점(직접경로)과 경로 관리의 유연성(간접경로)을 동시에 기대할 수 있다. 그러나 동시에 거래 당사자들의 다양한 이질적 기대치와 우선적 권리 확보 성향과 충돌할 수 있는 위험에 노출되게 된다. 따라서, 본 연구는 하이브리드 경로 관리의 비용과 편익에 대한 이해를 높이고자 시작된 것이며, 특히 패션의류시장에서 빈번히 활용되는 하이브리드 마케팅 경로, 당사자 간의 상호 지배문제, 상호 갈등문제 그리고 경로 관리 효율성을 높이고자 수행된 것이다. 이를 위해, 첫째, 기업간 지배 및 기업내 지배 문제를 통해 마케팅 경로 관리를 분석하고 나아가 판매원(샵마스터)관리 문제를 통합하여 분석하고자 한다. 둘째, 본 연구에 제시된 하나의 개별 틀 속에서 경로 지배관련 두 관점을 하나로 통합하여 추후 연구토대를 제시하고있다. 패션의류 메이커와 소매업자간의 경로 관계를 축으로 실증 조사된 결과, 본 연구에서 제시된 이론적 가설이 긍정적으로 뒷받침 되고 있다.

Analysis of decimation techniques to improve computational efficiency of a frequency-domain evaluation approach for real-time hybrid simulation

  • Guo, Tong;Xu, Weijie;Chen, Cheng
    • Smart Structures and Systems
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    • 제14권6호
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    • pp.1197-1220
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    • 2014
  • Accurate actuator tracking is critical to achieve reliable real-time hybrid simulation results for earthquake engineering research. The frequency-domain evaluation approach provides an innovative way for more quantitative post-simulation evaluation of actuator tracking errors compared with existing time domain based techniques. Utilizing the Fast Fourier Transform the approach analyzes the actuator error in terms of amplitude and phrase errors. Existing application of the approach requires using the complete length of the experimental data. To improve the computational efficiency, two techniques including data decimation and frequency decimation are analyzed to reduce the amount of data involved in the frequency-domain evaluation. The presented study aims to enhance the computational efficiency of the approach in order to utilize it for future on-line actuator tracking evaluation. Both computational simulation and laboratory experimental results are analyzed and recommendations on the two decimation factors are provided based on the findings from this study.

고온 고압하에서의 DME 연료 분무 및 증발 특성 (Spray and Evaporation Characteristics of DME fuel at the High pressure and temperature)

  • 김형준;서현규;이창식
    • 한국분무공학회지
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    • 제12권2호
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    • pp.101-107
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    • 2007
  • The purpose of this study is to analyze spray and evaporation characteristics of DME fuel at the high pressure and temperature. For the numerical analysis of dimethyl ether(DME) fuel spray characteristics, hybrid breakup model was applied to the DME spray and its breakup process. In order to obtain experimental results for comparison with the predicted ones, the visualization of the spray evolution process was executed by using a Nd:YAG laser. Also, the numerical investigation was conducted by the two hybrid models for primary and secondary breakup of the DME spray. The primary breakup model was used the Kelvin-Helmholtz(KH) breakup model. In the secondary breakup process, Rayleigh-Taylor(RT) and Drop Deformation Breakup(DDB) model was applied. The results of this study provide the macroscopic characteristics of the spray such as spray tip penetration and cone angle, and prediction accuracy of the two hybrid model.

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Plastic hinge length for coupled and hybrid-coupled shear walls

  • Abouzar Jafari;Meysam Beheshti;Amir Ali Shahmansouri;Habib Akbarzadeh Bengar
    • Steel and Composite Structures
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    • 제48권4호
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    • pp.367-383
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    • 2023
  • A coupled wall consists of two or more reinforced concrete (RC) shear walls (SWs) connected by RC coupling beams (CBs) or steel CBs (hybrid-coupled walls). To fill the gap in the literature on the plastic hinge length of coupled walls, including coupled and hybrid-coupled shear walls, a parametric study using experimentally validated numerical models was conducted considering the axial stress ratio (ASR) and coupling ratio (CR) as the study variables. A total of sixty numerical models, including both coupled and hybrid-coupled SWs, have been developed by varying the ASR and CR within the ranges of 0.027-0.25 and 0.2-0.5, respectively. A detailed analysis was conducted in order to estimate the ultimate drift, ultimate capacity, curvature profile, yielding height, and plastic hinge length of the models. Compared to hybrid-coupled SWs, coupled SWs possess a relatively higher capacity and curvature. Moreover, increasing the ASR changes the walls' behavior to a column-like member which decreases the walls' ultimate drift, ductility, curvature, and plastic hinge length. Increasing the CR of the coupled SWs increases the walls' capacity and the risk of abrupt shear failure but decreases the walls' ductility, ultimate drift and plastic hinge length. However, CR has a negligible effect on hybrid-coupled walls' ultimate drift and moment, curvature profile, yielding height and plastic hinge length. Lastly, using the obtained results two equations were derived as a function of CR and ASR for calculating the plastic hinge length of coupled and hybrid-coupled SWs.

두 상이한 등방성 이종재료 정지계면균열의 선단 응력장과 변위장에 관한 연구 (A Study on the Near-Field Stresses and Displacement of a Stationary Interfacial Crack in Two Dissimilar Isotropic Bimaterials)

  • 신동철;황재석;남정환
    • 대한기계학회논문집A
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    • 제28권12호
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    • pp.1897-1905
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    • 2004
  • In many part of machines or structures that made of bimaterial bonded with two dissimilar materials, most failures occur at their interface. Therefore, the accurate analysis of fracture characteristics and the evaluation of mechanical strength for interfacial crack are essential when we design those structures. In this research, stress and displacement components in the vicinity of stationary interfacial crack tip in the two dissimilar isotropic bimaterials are established. Hereafter, the stress components established in this research can be applied to the photoelastic hybrid method which can be used to analyze the fracture behavior of the two dissimilar isotropic bimaterials.

묵납자루 Acheilognathus signifer와 납자루 A. lanceolatus 사이의 자연 잡종 출현 (Occurrence of a Natural Hybrid between Acheilognathus signifer and A. lanceolatus (Pisces: Cyprinidae))

  • 김형수;윤승운;김현태;박종영
    • 한국어류학회지
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    • 제27권3호
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    • pp.199-204
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    • 2015
  • 묵납자루 Acheilognathus signifer와 납자루 A. lanceolatus간 잡종으로 추정되는 개체를 한강 수계의 김화남대천에서 채집하였다. 잡종의 기원을 확인하기 위하여 형태적 특징과 미토콘드리아 cytochrome b gene (cyt b)와 recombination-activating gene 1 (RAG-1)를 분석하였다. 외부 형태를 분석한 결과 잡종 개체는 등지느러미와 뒷지느러미 반문, 뒷지느러미 색깔, 몸의 체색 등은 두 부모종의 중간적 형질을 보였다. 미토콘드리아 cyt b 분석 결과 잡종 개체는 묵납자루와 염기서열이 99.9% 일치하여 묵납자루가 모계임이 밝혀졌다. 또한 RAG-1 분석 결과 double peak가 나타났는데 이는 잡종 개체임을 강력하게 시사하였다.