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Optimum Design of Truss on Sizing and Shape with Natural Frequency Constraints and Harmony Search Algorithm (하모니 서치 알고리즘과 고유진동수 제약조건에 의한 트러스의 단면과 형상 최적설계)

  • Kim, Bong-Ik;Kown, Jung-Hyun
    • Journal of Ocean Engineering and Technology
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    • v.27 no.5
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    • pp.36-42
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    • 2013
  • We present the optimum design for the cross-sectional(sizing) and shape optimization of truss structures with natural frequency constraints. The optimum design method used in this paper employs continuous design variables and the Harmony Search Algorithm(HSA). HSA is a meta-heuristic search method for global optimization problems. In this paper, HSA uses the method of random number selection in an update process, along with penalty parameters, to construct the initial harmony memory in order to improve the fitness in the initial and update processes. In examples, 10-bar and 72-bar trusses are optimized for sizing, and 37-bar bridge type truss and 52-bar(like dome) for sizing and shape. Four typical truss optimization examples are employed to demonstrate the availability of HSA for finding the minimum weight optimum truss with multiple natural frequency constraints.

Optimization of the braced dome structures by using Jaya algorithm with frequency constraints

  • Grzywinski, Maksym;Dede, Tayfun;Ozdemir, Yaprak Itir
    • Steel and Composite Structures
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    • v.30 no.1
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    • pp.47-55
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    • 2019
  • The aim of this paper is to present new and an efficient optimization algorithm called Jaya for the optimum mass of braced dome structures with natural frequency constraints. Design variables of the bar cross-section area and coordinates of the structure nodes were used for size and shape optimization, respectively. The effectiveness of Jaya algorithm is demonstrated through three benchmark braced domes (52-bar, 120-bar, and 600-bar). The algorithm applied is an effective tool for finding the optimum design of structures with frequency constraints. The Jaya algorithm has been programmed in MATLAB to optimize braced dome.

Reliability Computation of Neuro-Fuzzy Models : A Comparative Study (뉴로-퍼지 모델의 신뢰도 계산 : 비교 연구)

  • 심현정;박래정;왕보현
    • Journal of the Korean Institute of Intelligent Systems
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    • v.11 no.4
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    • pp.293-301
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    • 2001
  • This paper reviews three methods to compute a pointwise confidence interval of neuro-fuzzy models and compares their estimation perfonnanee through simulations. The eOITl.putation methods under consideration include stacked generalization using cross-validation, predictive error bar in regressive models, and local reliability measure for the networks employing a local representation scheme. These methods implemented on the neuro-fuzzy models are applied to the problems of simple function approximation and chaotic time series prediction. The results of reliability estimation are compared both quantitatively and qualitatively.

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A Study on the Performance Experiments of Lightweight Wall of Long-life Housing by Ceiling Infill System (천장 인필시스템에 따른 장수명주택 경량벽체의 성능실험에 관한 연구)

  • Seo, Dong-Goo;Lee, Jong-Ho;Kim, Eun-Young;Hwang, Eun-Kyoung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.247-248
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    • 2018
  • In order to secure the variability of long-life housing, dry walls are used. The composite gypsum board panel is the most frequently used infill system for the wall, and it is an excellent construction method in terms of constructability and economic feasibility. However, there are also problems such as the destruction of Ondol pipes at the bottom floor and being unable to fix the light weight steel frame (M-bar) when a variable composite gypsum board panel is used. To solve such problems, a wall with a method of fixing only the top part without fixing the bottom floor is developed, but it is difficult to identify the durability of ceiling frame according to the tensile force of stud and the safety according to the Stiffness and impact resistance (soft body) of ceiling frame. Therefore, this study verified the effectiveness of infill system for the wall by conducting experiment on the stiffness and impact resistance of composite gypsum board panel according to the reinforcement of ceiling frame (wooden frame, double saw-toothed bracket, Cross M-bar). As a result, it was possible to secure the safety of wooden frame while the impact resistance and the Stiffness of double saw-toothed bracket and cross M-bar were not secured.

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A Study on a Sensitivity Analysis of Design Parameters for the Speed-up of Overhead Rigid Conductor System (강체전차선로 고속화를 위한 설계파라미터 민감도 분석 연구)

  • Lee, Kiwon;Cho, Yong Hyeon;Kwon, Sam-Young;Park, Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.2
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    • pp.453-458
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    • 2017
  • R-Bar (Overhead Rigid Conductor system) has been lately used for the speed of over 200km/h in Europe, while it has been developed and used for the max. speed of 120km/h in Korea. Because R-Bar has advantages of reduction of tunnel cross sectional area and maintenance, its development for more high-speed is urgent in Korea having many mountain area. Therefore a sensitivity analysis of design parameters for the speed-up of R-Bar has performed in this study. For the analysis, we have developed a program for the prediction of dynamic characteristics between a pantograph and R-Bar. The program was evaluated with the actual test result and a current collection performance according to the parameters such as a distance between brackets, a stiffness of bracket and of R-Bar rail was predicted with the program.

Circuit Design of an RSFQ 2$\times$2 Crossbar Switch for Optical Network Switch Applications (광 네트워크 응용을 위한 RSFQ 2$\times$2 Switch 회로의 설계)

  • 홍희송;정구락;박종혁;임해용;강준희;한택상
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.10a
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    • pp.146-149
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    • 2003
  • In this Work, we have studied about an RSFQ 2$\times$2 crossbar switch. The circuit was designed, simulated, and laid out for mask fabrication The switch cell was composed of a splitter a confluence buffer, and a switch core. An RSFQ 2$\times$2 crossbar switch was composed of 4 switch cells, a switch control input to select the cross and bar, data input, and data outputs. When a pulse was input to the switch control input to select the cross or bar the route of the input data was determined, and the data was output at the proper output port. We simulated and optimized the switch-element circuit and 2$\times$2 crossbar switch, by using Xic and Julia. We also performed the mask layout of the circuit by using Xic and Lmeter.

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Design of Optical Multimode Interference Couplers with Ultracompact Propagating Width (초소형 전송폭을 갖는 광 다중모드 간섭결합기의 설계)

  • Ho, Kwang-Chun
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.1
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    • pp.47-52
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    • 2011
  • In this paper, to evaluate the design properties of 3D optical multimode interference (MMI) couplers with ultracompact width, modal transmission line theory and effective dielectric method are combined with together. A coupling efficiency based on the composed approach is defined, and the coupling length is numerically determined for the design of 3 dB coupler, cross coupler and bar coupler. The simulation result shows that the designed MMI coupler has a low insertion loss and a high splitting ratio.

Partial Discharge Characteristics of Ultra-High Voltage Cable Insulators by Needle Electrode (침 전극에 의한 초고압 케이블 절연재료의 부분방전 특성)

  • Kim, Gyun-Sig;Choi, Beom-Kyu;Byun, Doo-Gyoon;Cho, Kyung-Soon;Kim, Gwi-Yeol;Lee, Chung-Ho;Hong, Jin-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07a
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    • pp.477-480
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    • 2004
  • In other to estimate an electrical properties of the cross linked polyethylene cable, the partial discharge properties due to charge of electrode shape(needle and bar) and void size were investigated at room temperature. Fast trip and breakdown time were appeared by the closed of needle electrode. The trip and breakdown voltage depend on insulator thickness. As the result, confirmed larger effect of void size than effect of insulator thickness. The effect of voids size than influence of insulation thickness was dominated by internal an electrode of inner insulators.

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Study of the Effect of Loading Path on the Strain and Mechanical Properties of Aluminum with Flat and Groove Rolling Experiment (순수 알루미늄의 판재압연 및 공형압연시 가공경로에 따른 변형분포와 기계적 성질의 예측)

  • Kim, S.I.;Byon, S.M.
    • Transactions of Materials Processing
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    • v.17 no.6
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    • pp.420-428
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    • 2008
  • The effect of loading path changes on the strain and mechanical properties of a commercial pure aluminum was studied using flat rolling and groove rolling. Material during flat rolling undergoes a continuous monotonic compressive loading, while one during groove rolling experiences a series of cross compressive loading. Four-pass flat rolling and groove rolling experiment are designed such that the aluminum undergoes the same amount of the strain at each pass. The rolling experiment was performed at room temperatures. Specimens for tensile test are fabricated from the plate and bar rolled. In addition, the strain distribution for the plate and bar cold rolled specimens is also calculated by finite element method. The results reveal that differences of loading path attributed by monotonic loading(flat rolling) and cross loading(groove rolling) significantly influence the mechanical properties such as yield stress, ultimate tensile stress, strain hardening and elongation. It is clear that the different loading path can give raise to change the deformation history, although it is deformed with same amount of strain for same material.