• Title/Summary/Keyword: Dynamic Load Calculation

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A Study on the Numerical Analysis Variables of Rock Structures Subject to Dynamic Loads (동적 하중을 받는 암반 구조물의 수치해석 변수에 대한 고찰)

  • Ryu, Chang-Ha;Choi, Byung-Hee;Jang, Hyung-Su
    • Explosives and Blasting
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    • v.36 no.3
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    • pp.10-18
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    • 2018
  • The dynamic behaviour of the rock mass under the dynamic load is different from the static application of the maximum load of the same size. An experimental approach to investigating rock behavior under dynamic loads is more difficult than that under static conditions in control of dynamic loads, measurement and analysis of the results. Numerical methods are less constrained by performing the experiments numerically, rather than experimental ones, so they can be very powerful analytical tool at the design stage. However, even if the algorithms of the analysis method are appropriate, careful analysis is required because the calculation results may vary largely depending on input data and boundary conditions. In this paper, when investigating the behavior of rock structures under dynamic load numerically, the effects of boundary conditions, dynamic load and calculation time step, and dynamic load characteristics on the calculation results were reviewed to provide guidance on setting up boundary conditions and calculation time step related to dynamic analysis.

Impact Factor of High-Speed Railway Bridges from Dynamic Response under KTX Running (고속철도교량의 동적응답에 의한 충격계수 산정)

  • Yoon, Hye-Jin;Chin, Won-Jong;Kwark, Jong-Won;Hwang, Eui-Seung;Kim, Byung-Suk
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.1631-1635
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    • 2011
  • To consider dynamic magnification effect at the static design stage, impact load factor is applied to design load. Current impact load factor adopted EUROCODE without verification while Japan suggested impact load factor including velocity of high-speed train throughout theoretical and experimental studies. On the purpose of evaluate current impact load factor, this study investigated the calculation of impact load factor from dynamic response of running train.

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A Study on Dynamic Characteristic Analysis of Straight Bevel Gear (직선베벨기어의 동특성해석에 관한 연구)

  • Lyu, Sung-Ki;Shin, Gue-Su
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.12
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    • pp.157-164
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    • 1995
  • Straight belvel gear is used mainly for steering system, final reduction and differential gear in the automobile. The more high load, high velocity driving bevel gear, the more unsafe and unpleasant. In thid study, we get a kinematic equation by modelling straight bevel gear pair with simple elastic system, the dynamic characteristic analysis about this system, we got the dynamic load factor of tooth surface. Comparing the value of dynamic load factor by calculation with the measured value of Terauchi's experimental results is similar. We think it useful to analysis the vibration and the noise of straight bevel gear in operation with the analytic method of dynamic load of straight bevel gear using in this study.

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The Study of Dynamic Characteristic of PMLSM According to Variable Load (영구자석형 선형 동기 전동기의 가변부하에 따른 동특성 해석)

  • Lee, Seung-Hoon;Jang, Ki-Bong;Kim, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.4
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    • pp.596-602
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    • 2008
  • This paper presents the dynamic characteristic analysis of Permanent Magnet Linear Synchronous Motor(PMLSM) according to variable load. In order to analyze dynamic characteristics, finite element method(FEM) was used for calculation of the parameter and the Matlab simulink was used for dynamic characteristic simulation. The measuring system of the dynamic characteristics was manufactured and the experiment results were compared with the simulation results.

A Study on the Cooling Load of South and East Facing Apartment Houses (남향과 동향 집합주택의 냉방부하에 관한 연구)

  • 박근우;이경희
    • Journal of the Korean housing association
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    • v.11 no.2
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    • pp.129-137
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    • 2000
  • This study is about the difference of South and East facing Cooling load of Apartment s Houses using Dynamic Heat-flow Calculation. Therefore, the purpose of this study is come in to use Material for the Thermal Environments of Apartment Houses. The results of the analysis are below. (1) For the peak load of degree hour; The highest is "I" unit and the next high load is H, F, E, C, B, G, D and A unit for the south facing Apartment houses. The higher load is "H" unit and the next high load is I, E, F, B, C, G, D, A Unit for the east facing Apartment houses. (2) For the total load of degree day; The highest load is "I" unit and the next high load is H, G, F, E, C, B, D and A Unit for the south facing Apartment houses. The highest load is "H" unit and the next high load is I, G, E, F, B, C, D, A Unit for the east facing Apartment houses. (3) For the total load of degree day; The highest load is "H" Unit for the east facing Apartment houses and the Lowest load is "A" Unit for the south facing Apartment houses.is "A" Unit for the south facing Apartment houses.nt houses.

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Dynamic Load calculation at the Bracket of High Speed Train Catenary System (고속전철 가선계 가동 브래킷의 동적하중 계산)

  • Choi, Yeon-Sun;Lee, Seung-Il
    • Journal of the Korean Society for Railway
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    • v.9 no.5 s.36
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    • pp.588-593
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    • 2006
  • The catenary system of a high speed train is designed to have a flexibility to ensure the contact with a pantograph during high speed running. The flexibility inevitably entails a vibration. The vibration is transferred to a utility pole through brackets. Therefore, the examination of the dynamic load at the bracket due to the train running is necessary for the design of the bracket. In this research, an equation of motion is derived to calculate the dynamic load at the bracket during high speed running and a computer program is developed. Also, the analyzed results are compared to characterize the dynamic load at the bracket.

Load Flow Calculation and Short Circuit Fault Transients in AC Electrified Railways

  • Hosseini, Seyed Hossein;Shahnia, Farhad
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.2203-2206
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    • 2005
  • A load flow and short circuit fault simulation of AC electrified railway distribution systems is presented with DIgSILENT PowerFactory software. Load flow of electrified railways distribution system with concerning multi train lines and dynamic characteristics of train load is studied for different time laps. The dynamic characteristics of train load in starting and braking conditions with different starting and stopping times and its moving positions makes the load flow complicated so there is a great need in studying the effects of electrified railways on load flow. Short circuit fault transients is also studied and simulated for both power system or traction distribution system and their effects on the operation of the train sets is investigated.

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A Study on Validity of Applying Simplify modeling Method for Heating/Cooling Load Calculation (냉난방부하 계산의 단순화 모델링 기법 적용 타당성 검토에 관한 연구)

  • Kang, Yoon-Suk;Park, Jong-Il;Ihm, Pyeong-Chan
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.1386-1391
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    • 2008
  • As the time goes by, the energy use in buildings are increasing threateningly. So, it is important to have an accurate energy load calculation for buildings. The accurate energy simulation program carries numerous input data. So, our purpose of this study is to verify the application of simplify modeling method which eliminates coordinates of building components instead of using full coordinates by using DOE2. After comparing original modeling method with simplify modeling method, we applied PAF for daylighting control in the building to verify the application of daylighting control in simplify modeling method. The results shows that there are little difference between original modeling and simplify modeling. Also it showed that application of daylighting control has little difference between original modeling so it is feasible to adapt simplify modeling. These results reveals that the application of simplify modeling is possible to predict energy load and use of the building.

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A Comparative Study on Bearing Capacity of Single Pile Based on Calculation Method (산정방법에 따른 단말뚝의 지지력 비교연구)

  • 이영대;심재현
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.39 no.2
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    • pp.124-133
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    • 1997
  • Pile load test is good for estimating pile bearing capacity, but using this method is limited by time and cost required. Dynamic and static method is more convenient and economical, but confidence of estimated value by dynamic and static method are lower than that of pile load test. After being compared pile bearing capacity data obtained from pile load test with those of other two methods, the results from this study were summarised as follows. For allowable bearing capacity values greater than 175t per pile, bearing capacity acquired from static method was higher than that acquired from pile load test, whereas bearing capacity acquired from pile load test was higher than that acquired from static method for values under 175 per pile. It was that variance of bearing capacity was large when bearing capacity obtained by dynamic method was higher than 250t. Also bearing capacity based on dynamic method was higher than that based on pile load test. Allowable bearing capacity get from dynamic method suggested that carefull precautions are necessary in application for allowable bearing capacity values higher than 2S0ton per pile.

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