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Free vibration analysis of gravity dam-reservoir system utilizing 21 node-33 Gauss point triangular elements

  • Ziaolhagh, Seyed Hamid;Goudarzi, Meghdad;Sani, Ahmad Aftabi
    • Coupled systems mechanics
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    • v.5 no.1
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    • pp.59-86
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    • 2016
  • This paper deals with the free vibration analysis of a dynamical coupled system: flexible gravity dam- compressible rectangular reservoir. The finite element method is used to compute the natural frequencies and modal shapes of the system. Firstly, the reservoir and subsequently the dam is modeled by classical 8-node elements and the natural frequencies plus modal shapes are calculated. Afterwards, a new 21-node element is introduced and the same procedure is conducted in which an efficient method is employed to carry out the integration operations. Finally, the coupled dam-reservoir system is modeled by solely one 21-node element and the free vibration of dam-reservoir interaction system is investigated. As an important result, it is clearly concluded that the one high-order element treats more precisely than the eight-node elements, since the first one utilizes fifth-degree polynomials to construct the shape functions and the second implements polynomials of degree two.

A Case Study on the Analysis of Characteristics of Marine HVAC Duct - For the Development of Maintenance Robot's Movement Algorithm - (선박 공조닥트의 특성분석에 관한 사례 연구 - 유지관리용 로봇의 이동 알고리즘 개발을 위한 분석 -)

  • Hwang, Kwang-Il
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.2
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    • pp.211-217
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    • 2006
  • This study is focused on the analysis of the characteristics of marine HVAC duct. These results will be applied to develope a robot which is for maintaining a cabin comfort, convenience and healthy through HVAC duct. The followings are the results of this study. (1) The evaluated items which proposed by at the view point of robot's function can be adapted to other vessels for the same purpose, (2) For the case of round type duct. the maximized conditions which robot has to have are straight length of 40.152mm, inclination of $45^{\circ}$. horizontal bending of $90^{\circ}$. increasing diameter of 1.28 times, and 0.625 times decreasing diameter in branch. (3) For the case of rectangular type duct. the maximized conditions are straight length of 15.987mm. aspect ratio of 4.17:1, inclination of $18.92^{\circ}$. horizontal bending of $90^{\circ}$, and 0.65 times decreasing diameter in branch.

An experimental study and new correlations of viscosity of ethylene glycol-water based nanofluid at various temperatures and different solid concentrations

  • Bidgoli, Mahmood Rabani;Kolahchi, Reza;Karimi, Mohammad Saeed
    • Structural Engineering and Mechanics
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    • v.58 no.1
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    • pp.93-102
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    • 2016
  • This article presents an experimental study on the effect of temperature and solid volume fraction of nanoparticles on the dynamic viscosity for the CuO/EG-water nanofluid. Nanoparticles with diameter of 40 nm are used in the present study to prepare nanofluid by two-step method. A "Brookfield viscometer" has been used to measure the dynamic viscosity of nanofluid with solid volume fraction up to 2% at the temperature range between 20 to $60^{\circ}C$. The findings have shown that dynamic viscosity of nanofluid increases with increasing particle volume fraction and decreasing temperature. Nine different correlations are developed on experimental data point to predict the relative dynamic viscosity of nanofluid at different temperatures. To make sure of accuracy of the proposed correlations, margin of deviation is presented at the end of this study. The results show excellent agreement between experimental data and those obtained through the correlations.

An Efficient No-Core Cut Pocketing CAM System for Wire-EDM

  • EL-Midany, Tawfik T.;Kohail, Ahmed M.;Tawfik, Hamdy
    • International Journal of CAD/CAM
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    • v.6 no.1
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    • pp.167-172
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    • 2006
  • Recently, wire-EDM became a necessity for many engineering applications, particularly in the dies making. No-Core cut process is helpful for operations in which falling slug can jam the machine or wire. In this paper a proposed CAM system (called NCPP) is introduced, to overcome the limitations of the existing CAM systems in the machining of No-Core cut. The proposed CAM system (NCPP) provides pocketing of No-core cut and optimal selection of the position of starting hole (wire threading point), to minimize toolpath length. It was written for data exchange between CAD-CAM-CNC machines. This data model will become part of the ISO (Data model for Computerized Numerical Controllers) international standard. The NCPP system has been implemented in Visual C++. Many examples are used to illustrate NCPP system. The results show that, NCPP saves the machining time by significant value. This value depends on the shape and complexity of the workpiece that is being cut.

A Study on the Multi-Tap Update Algorithm in Time Variant Channel Model (시변채널 모델에서 다중 탭 갱신 알고리즘에 관한 연구)

  • Lee Seung-Dae
    • Journal of the Korea Computer Industry Society
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    • v.7 no.1
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    • pp.39-46
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    • 2006
  • Multipath diversity reception is applied to the compensation of the distortion of channel, which occurs in transmission of data at rapid speed. DS/BPSK systems are composed of the equipment with reception structure combined with a compensation algorithm to diversity branch. The efficiency of the system is evaluated from the point of view of average bit error rate according to SNR. In order to remove intersymbol interference, this algorithm is applied to time-invariant channel at every diversity branch with the number of L. As a result, the average bit error rate is saturated by $10^{-2}$ at the conventional compensation algorithm.

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THE C-M DIAGRAM OF THE GLOBULAR CLUSTER, NGC 6752

  • Lee, See-Woo;Cannon, R.D.
    • Journal of The Korean Astronomical Society
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    • v.13 no.1
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    • pp.15-26
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    • 1980
  • The BV-photographic photometry was made for 1714 stars (V<19.5) in NGC 6752. The C-M diagram of this cluster shows an unusually extended blue horizontal branch $(V=13.5{\sim}17.8)$ with a wide gap $(V=16{\sim}16.7)$ and the well defined giant branch with gaps at V=13.85 and 16.2. The turnoff point is defined at $V=17.25{\pm}0.15$ and (B-V) = $0.46{\pm}0.02$. If we take $V_{HB}=13.85$ for NGC 6752, then ${\Delta}V=2.80,\;(B-V)_{0,g}=0.76\;and\;{\Delta}V_{TO}=3.40$ and the chemical abundance is estimated to be [Fe/H]=-1.67 or $Z=4.3{\times}10^{-4}\;and\;Y=0.26$. Some other physical parameters of this cluster are derived and compared with those for the well observed clusters M 3, M 13, M 15 and M 92.

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The Recognition of Printed HANGUL Character (인쇄체 한글 문자 인식에 관한 연구)

  • Jang, Seung-Seok;Jang, Dong-Sik
    • Journal of Korean Institute of Industrial Engineers
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    • v.17 no.2
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    • pp.27-37
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    • 1991
  • A recognition algorithm for Hangul is developed by structural analysis to Hangul in this theses. Four major procedures are proposed : preprocessing, type classification, separation of consonant and vowel, recognition. In the preprocessing procedure, the thinning algorithm proposed by CHEN & HSU is applied. In the type classification procedure, thinned Hangul image is classified into one of six formal types. In the separation of consonant and vowel procedure, starting from branch-points which are existed in a vowel, character elements are separated by means of tracing branch-point pixel by pixel and comparison with proposed templates. In the same time, the vowels are recognized. In the recognition procedure, consonants are extracted from the separated Hangul character and recognized by modified Crossing method. Recognized characters are converted into KS-5601-1989 codes. The experiments show that correct recognition rate is about 80%-90% and recognition speed is about 2-3 character persecond in three types of different input data on computer with 80386 microprocessor.

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Study of in Silico Simulation Method for Dynamic Network Model in Lactic Acid Bacteria (Lactic Acid Bacteria의 동역학 네트워크 모델을 이용한 in Silico 모사방법 연구)

  • Jung, Ui-Sub;Lee, Hye-Won;Lee, Jin-Won
    • Journal of Institute of Control, Robotics and Systems
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    • v.11 no.10
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    • pp.823-829
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    • 2005
  • We have newly constructed an in silico model of fermentative metabolism for Lactococcus lactis in order to analyze the characteristics of metabolite flux for dynamic network. A rigorous mathematical model for metabolic flux has been developed and simulation researches have been performed by using GEPASI program. In this simulation task, we were able to predict the whole flux distribution trend for lactate metabolism and analyze the flux ratio on the pyruvate branch point by using metabolic flux analysis(MFA). And we have studied flux control coefficients of key reaction steps in the model by using metabolic control analysis(MCA). The role of pyruvate branch seems to be essential for the secretion of lactate and other organic byproducts. Then we have made an effort to elucidate its metabolic regulation characteristics and key reaction steps, and find an optimal condition for the production of lactate.

Space Diversity Combining Scheme Using Phase Difference between Main and Diversity Signals (메인과 다이버시티 신호사이 위상차를 이용한 공간 다이버시티 결합방법)

  • Jung, Gillyoung
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.14 no.5
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    • pp.44-51
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    • 2015
  • The deployment of high capacity backhaul is required due to explosive growth in mobile data services. For rapid backhaul deployment, point to point microwave is a much easier and cheaper technology. The space diversity scheme is used in point to point microwave links. The purpose of space diversity is to overcome fading by combining signals from two separate receiver antennas. For signal combining algorithm, maximum power and minimum distortion methods were used and these algorithms were reported not to be good enough for robustness in selective fading. In this paper, a more practically efficient signal combining scheme from the main and diversity branch is proposed and evaluated in selective fading channel. The proposed algorithm has shown significant performance improvement in terms of signal spectrum.

Integrated Wireless Network Control System using a Cloud-based AP Controller (클라우드 기반의 AP Controller를 이용한 무선 네트워크 통합 관리 시스템)

  • Min, Kyung-Su;Yoon, Kwon-Jin;Park, Min-Ho;Jung, Sou-Hwan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.4
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    • pp.720-722
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    • 2015
  • In this paper, we propose a new type of integrated wireless control system using a cloud-based AP Controller. With this system, network administrator can control wireless network in head office and branch hierarchically. In head office, they have an AP Controller Manager, it can control all Access Points, Access point Controllers in their networks. In addition, if we need to install new Access point Controller because of the increasing number of Access Point, the process of making virtual Access point Controller can be automated. This paper presents an architecture of the integrated wireless control system, as well as describes its components and protocols.