• Title/Summary/Keyword: location assessment

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Damage assessment from curvature mode shape using unified particle swarm optimization

  • Nanda, Bharadwaj;Maity, Damodar;Maiti, Dipak Kumar
    • Structural Engineering and Mechanics
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    • v.52 no.2
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    • pp.307-322
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    • 2014
  • A two-step procedure to detect and quantify damages in structures from changes in curvature mode shapes is presented here. In the first step the maximum difference in curvature mode shapes of the undamaged and damaged structure are used for visual identification of the damaged internal-substructure. In the next step, the identified substructures are searched using unified particle swarm optimization technique for exact identification of damage location and amount. Efficiency of the developed procedure is demonstrated using beam like structures. This methodology may be extended for identifying damages in general frame structures.

An Analysis of Local Wind Field by Location of Industrial Complex using CALMET and ENVI-MET (CALMET 및 ENVI-MET를 이용한 산업단지 입지에 따른 국지 바람장 분석)

  • Song, Dong Woong
    • Journal of Environmental Impact Assessment
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    • v.21 no.3
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    • pp.417-429
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    • 2012
  • In this study, a diagnostic wind model, CALMET and a micrometeorological numerical model, ENVI-MET were used to analyze the wind field in and out of the site designated for the industrial complex around Buron-myeon, Wonju, Gangwon-do. The results of modeling with CALMET showed that the air flow in industrial complex was little affected by the surrounding terrain. And the result of wind field analysis with ENVI-MET showed there are turbulent air flows such as cavity and wake around structures in the industrial complex, which can cause high-air pollution. Therefore, it is necessary to design the industrial complex considering the wind path according to wind directions.

Evaluation on the Noise Influence and Reduction due to the Change of Military Aircraft Flight Path (군용항공기의 운항 경로 변경에 따른 소음영향 및 저감 평가)

  • Lee, Jin-Young;Lee, Chan;Kil, Hyun-Gwon
    • Journal of Environmental Impact Assessment
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    • v.18 no.3
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    • pp.143-150
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    • 2009
  • The present study investigates the effects of the flight paths of military aircraft on noise map and its WECPNL(Weighted Equivalent Continuous Perceived Noise Level) distribution. Aircraft noise modeling and simulation have been performed on a Korean military air base by means of INM(Integrated Noise Model) with the input data of airfield location, aircraft specifications, flight paths and aircraft's operation schedules. The result of noise modelling has been verified in comparison with the result of measured noise level. The flight path of military aircraft, as the key parameter of the present study, was modeled by combining takeoff, overfly, approach and touch-and-go modes. The present INM simulations have been conducted for various flight path cases with different takeoff, approach modes and overfly modes. The simulation results showed that the change of flight path can remarkably affect the noise influence region and the WECPNL distribution around the airfield.

3-Dimensional Stress Analysis for Creep Life Assessment of Y-Piece Under Inner Pressure (내압을 받는 Y 배관의 크리프 수명 평가를 위한 3차원 응력해석)

  • Shin, Kyu-In;Lee, Jin-Sang;Yoon, Kee-Bong
    • Journal of the Korean Society of Safety
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    • v.22 no.2 s.80
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    • pp.22-27
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    • 2007
  • To assess a creep life of elevated temperature plant components, inspections and analysis are usually focused on the critical locations. In this study, stress analysis of a weld region in branch part of Y-piece was conducted by using a three-dimensional finite element analysis. The stresses at the inner and outer surface in the weld part were estimated by using elastic and elastic-creep analysis. For the elastic-creep analysis two kinds of elastic-creep analysis was conducted. The one was assumed that base and weld material properties were same and the other was that material properties were different between base and weld metal. The material properties of base and weld metal were used from reference data. The results showed the stress relaxation level and its location. The result stresses are also compared with elastic stresses.

Damage assessment of linear structures by a static approach, II: Numerical simulation studies

  • Tseng, Shih-Shong
    • Structural Engineering and Mechanics
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    • v.9 no.2
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    • pp.195-208
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    • 2000
  • To confirm the theory and static defect energy (SDE) equations proposed in the first part, extensive numerical simulation studies are performed in this portion. Stiffness method is applied to calculate the components of the stresses and strains from which the energy components and finally, the SDE are obtained. Examples are designed to cover almost all kinds of possibilities. Variables include structural type, material, cross-section, support constraint, loading type, magnitude and position. The SDE diagram is unique in the way of presenting damage information: two different energy constants are separated by a sharp vertical drop right at the damage location. Simulation results are successfully implemented for both methods in all the cases.

Structural Response Analysis on Inner Barrel Assembly Top Plate of APR1400 Reactor Vessel (APR1400 원자로 내부배럴집합체 상부판 구조응답해석)

  • Kim, Kyu-Hyung;Ko, Do-Young;Kim, Sung-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.907-910
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    • 2012
  • Since the inner barrel assembly of the Advanced Power Reactor 1400 reactor vessel is a new design feature introduced instead of CEA(control element assembly) shroud assembly, the inner barrel assembly can be a significant object of structural integrity assessment. This paper covers the structural responses of top plate, which is a component of the inner barrel assembly, against the deterministic hydraulic load induced by pump pulsation and the random hydraulic load induced by turbulence of coolant. The top plate responds to the deterministic hydraulic load more than to the random hydraulic load and shows enough structural integrity. The results of this paper will be important basis for the selection of instruments and measurement location.

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Groundwater Flow Analysis for a Block Cavern Type Radwaste Repository (방사성폐기물 동굴처분 안전성 평가를 위한 지하수 유동 평가)

  • 황용수;서은진;강철형
    • Tunnel and Underground Space
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    • v.14 no.3
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    • pp.203-214
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    • 2004
  • For total system performance of a potential radwaste repository, a hypothetical site is assumed with feasible boundary conditions. Assuming a coastal repository, the sensitivity of the depth and the location of a repository along with the distance to a joint on groundwater transport pathways is studied. Results from Connectflow analysis could be used as input of the MASCOT-t the probabilistic safety assessment code.

Detection of Laver Aquaculture Site of Using Multi-Spectral Remotely Sensed Data (다중분광 위성자료를 이용한 김 양식어장 탐지)

  • Jeong, Jongchul
    • Journal of Environmental Impact Assessment
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    • v.14 no.3
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    • pp.127-134
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    • 2005
  • Recently, aquaculture farm sites have been increased with demand of the expensive fish species and sea food like as seaweed, laver and oyster. Therefore coastal water quality have been deteriorated by organic contamination from marine aquaculture farm sites. For protecting of coastal environment, we need to control the location of aquaculture sites. The purpose of this study is to detect the laver aquaculture sites using multispectral remotely sensed data with autodetection algorithm. In order to detect the aquaculture sites, density slice and contour and vegetation index methods were applied with SPOT and IKONOS data of Shinan area. The marine aquaculture farm sites were extracted by density slice and contour methods with one band digital number(DN) carrying 65% accuracy. However, vegetation index algorithm carried out 75% accuracy using near-infra red and red bands. Extraction of the laver aquaculture site using remotely sensed data will provide the efficient digital map for coastal water management strategies and red tide GIS management system.

Damage assessment of composite structures using Particle Swarm Optimization

  • Jebieshia, T.R.;Maiti, D.K.;Maity, D.
    • International Journal of Aerospace System Engineering
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    • v.2 no.2
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    • pp.24-28
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    • 2015
  • Composite materials are highly sensitive to the presence of manufacturing and service-related defects that can reach a critical size during service condition and thereby may affect the safety of the structure. When the structure undergoes some kind of damage, its stiffness reduces, in turn the dynamic responses change. In order to avoid safety issues early detection of damage is necessary. The knowledge of the vibration behavior of a structure is necessary and can be used to determine the existence as well as the location and the extent of damage.

A Study on the Accident Analysis by Nip Points and Risk Assessment in the Medium and Small Enterprise (중소 제조업의 끼임 재해분석 및 위험성평가 연구 - 경인지역 50인 미만 제조업을 대상으로 -)

  • Yang, Kwang Mo
    • Journal of the Korea Safety Management & Science
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    • v.16 no.2
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    • pp.63-70
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    • 2014
  • As preventive measures have received tremendous attention to prevent any possible accident in advance, many work places have introduced safety and health management systems. However despite of this government's effort, the industrial accident rate of small-scale businesses with less than 50 employees does not decline, which is mainly because the projects are not differentiated according to the risk level of individual business. To evaluate the risk level of small-scale businesses with less than 50 employees and then establish effective safety and health management systems according to the risk level, this study has conducted the following processes. The small-scale businesses with less than 50 employees were evaluated through accident type, and potential accident risk factor was evaluated through location, business type, and business size. The results of this analysis are expected to make contribution to improving the effectiveness of the safety and health management supports to small-scale businesses with less than 50 employees.