• Title/Summary/Keyword: Calibration Site

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A Technique for Alignment to True North Using Image Processing (영상 선호 처리를 이용한 풍향센서의 진북맞추기)

  • Lee, Jeong-Wan;Nam, Yoon-Su;Yoo, Neung-Soo
    • Journal of Industrial Technology
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    • v.22 no.A
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    • pp.67-72
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    • 2002
  • A technique for alignment to true north is presented, based on synchronized measurements of vision image by a camera and output voltage of wind direction sensor. The true wind direction is evaluated by means of image processing techniques with least square sense, and then evaluated true value is compared with measured output voltage of the sensor. The proposed technique is applied to real meteorological tower m Daekwanryung test site. In addition, some uncertainty analysis of this method is presented.

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A Study on TRANSYT Model-embedded Parameters (TRANSYT 모델의 내재 모개변수에 관한 연구)

  • 도철웅
    • Journal of Korean Society of Transportation
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    • v.6 no.1
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    • pp.55-64
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    • 1988
  • Prior to using any computer model, the program-embedded palameters showing significant differences from real world should be calibrated. This is especially true when the model is expected to be used fro various roadway and traffic condition. The calibration of TRANSYT model was conducted for the parameters of start-up delay, and lag, stop penalty(K), platoon dispersion factor, and saturation flow rate. The values of the parameters were obtained by theoretical methods from actual field measurements for discharging and arrival pattern. The sites elected for the study was an intersection of Dongil-Ro and Hwarang-Ro, and a 334 meter downstrean section from the intersection stop line on westbound Hwarang-Ro. The study results showed that the start-up delay was 2.6 sec, end lag was 1.0 sec, saturation flow rate was 2287 pcphgpl, platoon dispersion factor was 0.2-03, and stop penalty(K) was 32. However, since these parameters re apt to depend on traffic and roadway condition, it is doubtful whether the obtained values will be applicable to the area-wide situation other than this particular site.

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The Field Test of Power Performance Measurement for U50 Wind Turbine (U50 풍력발전기 출력성능 실증연구)

  • Hwang, Jin-Su;Jang, Seong-Tae;Kim, Dae-Hyun;Bang, Jo-Hyug;Ryu, Ji-Yune
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.11a
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    • pp.372-375
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    • 2007
  • 750kW gearless type wind turbine, named U50, is developed by UNISON in Korea. The newly developed wind turbine should be evaluated the power curve and the estimated annual energy production by following international standard to verify the power performance characteristics. This paper shows the test and evaluation procedure according to IEC 61400-12-1 which specifies a procedure of measuring the power performance characteristics of a single wind turbine and applies to the testing of wind turbines of all types and sized connected to the electrical power network. And this paper also shows the power performance characteristics for U50 wind turbine which is determined in accordance with IEC regulation.

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Contribution of modification of a pressuremeter for an effective prediction of soil deformability

  • Aissaoui, Soufyane;Zadjaoui, Abdeldjalil;Reiffsteck, Philippe
    • Geomechanics and Engineering
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    • v.23 no.4
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    • pp.381-392
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    • 2020
  • The difficulties, challenges and limitations faced in standard pressuremeter testing in the measurement of low soil deformations led a number of researchers to think about the possible modification of the equipment, and especially the replacement of the volumeter by a Hall Effect sensor. This article is a major contribution in this direction. It makes an attempt to detail the design, manufacture and operation of the new equipment. The calibration of the various components was carried out according to the rules presently in force. This proposal was applied, on an exploratory basis, to the data of a real site located in France. The authors present the preliminary results of some cyclic pressuremeter tests, previously carried out in the laboratory, on a sandy material, and they then provide a basic interpretation of these results. The findings indicated that the proposed apparatus is capable of providing high-quality information about constraints and deformations. Although these tests were performed within the laboratory, it was possible to analyze the power, quality, performance and insufficiencies of the proposed equipment.

Effect of Hysteretic Models on the Inelastic Design Spectra (비탄성 설계 스펙트럼에 의한 이력 모델의 효과)

  • 한상환;오영훈;이리형
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1999.10a
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    • pp.214-224
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    • 1999
  • The design response spectrum has been widely used in seismic design to estimate force and deformation demands of structures imposed by Earthquake Ground Motion (EQGM). Inelastic Design Response Spectra (IDRS) to specify design yielding strength in seismic codes are obtained by reducing the ordinates of Linear Elastic Design Response Spectrum (LEDRS) by strength reduction factor (R). Since a building is designed using reduced design spectrum (IDRS) rather than LEDRS in current seismic design procedures it allows structures behave inelastically during design level EQGM. Inelastic Response Spectra (IRS) depend not only on the characteristics of the expected ground motion at a given site, but also on the dynamic properties and nonlinear characteristics of a structure. However, it has not been explicitly investigated the effect of different hysteretic models on IRS. In this study, the effect of hysteretic models on IRS is investigated.

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Assessment of a concrete arch bridge using static and dynamic load tests

  • Caglayan, B. Ozden;Ozakgul, Kadir;Tezer, Ovunc
    • Structural Engineering and Mechanics
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    • v.41 no.1
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    • pp.83-94
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    • 2012
  • Assessment of a monumental concrete arch bridge with a total length of 210 meters having three major spans of 30 meters and a height of 65 meters, which is located in an earthquake-prone region in southern part of the country is presented in this study. Three-dimensional finite element model of the bridge was generated using a commercially available general finite element analysis software and based on the outcomes of a series of in-depth acceleration measurements that were conducted on-site, the model was refined. By using the structural parameters obtained from the dynamic and the static tests, calibrated model of the bridge structure was obtained and this model was used for necessary calculations regarding structural assessment and evaluation.

Application of Depth-Integrated Two-Dimensional Sediment Transport Model (수심적분 이차원 유사이동모형의 적용)

  • 이남주;최흥식
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.11 no.2
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    • pp.127-133
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    • 1999
  • The MOSU model, a depth-averaged two-dimensional sediment transport model, is applied to simulate the bed level changes before and after dock construction in Daemyung site. The model is a semi¬coupled finite difference model that can be applied to a river, a reservoir, a lake, estuaries, or coastal regions, The model is able to simulate the transport of fine sand, silt, and clay. The model parameters are estimated by qualitative calibration. A prediction result of the numerical model shows that the bed level changes due to dock construction are little.

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A Technique for Alignment to True North Based on Camera in Meteorological Installation (풍황 계측 타워 설치시 카메라를 사용한 진북 맞추기 기법)

  • Yoo Neung Soo;Nam Yoo Su;Lee Jeong Wan
    • Journal of Institute of Control, Robotics and Systems
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    • v.11 no.2
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    • pp.122-126
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    • 2005
  • A technique for alignment to true north is presented based on synchronized measurements of vision image by a camera and output voltage of wind direction sensor. The true wind direction is evaluated by means of image processing techniques with least square sense, and then evaluated true value is compared with measured output voltage of the sensor. The uncertainty analysis about the component error for the proposed method in practical situation is performed. The proposed technique is applied to real meteorological tower (wind measuring tower) at the Daekwanryung test site. In addition, some uncertainty analysis of this method is presented.

Evaluation of Runoff and Pollutant Loads using L-THIA 2012 Runoff and Pollutant Auto-calibration Module and Ranking of Pollutant Loads Potential (L-THIA 2012 유출 및 수질 자동 보정 모듈을 이용한 유출/비점부하량 산정 및 비점오염 부하량 포텐셜 등급화)

  • Jang, Chunhwa;Kum, Donghyuk;Ha, Junsoo;Kim, Kyoung-Soon;Kang, Dong Han;Kim, Keuk-Tai;Shin, Dong Suk;Lim, Kyoung Jae
    • Journal of Korean Society on Water Environment
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    • v.29 no.2
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    • pp.184-195
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    • 2013
  • Urbanization from agricultural/forest areas has been causing increased runoff and pollutant loads from it. Thus, numerous models have been developed to estimate NPS loading from urban area and Long-Term Hydrologic Impact Analysis (L-THIA) model has been used to evaluate effects of landuse changes on runoff and pollutant loads. However, the L-THIA model could not consider rainfall intensity in runoff evaluation. Therefore, the L-THIA model, capable of simulating runoff using 10-minute rainfall data, was applied to the study areas for evaluation of estimated runoff and NPS. The estimated Nash-Sutcliffe coefficient (NSE) values were over 0.6 for runoff, BOD, TN, and TP for most sites and watershed. The calibrated model was further extended to other counties for pollutant load potential evaluation. Pollutant load potential maps were developed and target areas were identified. As shown in this study, the L-THIA 2012 can be used for evaluation runoff and pollutant loads with limited data sets and its estimation could be used in identifying pollutant load hot spot areas for implementation of site-specific Best Management Practices.

Weigh-in-Motion load effects and statistical approaches for development of live load factors

  • Yanik, Arcan;Higgins, Christopher
    • Structural Engineering and Mechanics
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    • v.76 no.1
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    • pp.1-15
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    • 2020
  • The aim of this paper is to simply present live load factor calculation methodology formulation with the addition of a simple new future load projection procedure to previously proposed two methods. For this purpose, Oregon Weigh-in-Motion (WIM) data were used to calculate live load factors by using WIM data. These factors were calculated with two different approaches and by presenting new simple modifications in these methods. A very simple future load projection method is presented in this paper. Using four different WIM sites with different average daily truck traffic (ADTT) volume, and all year data, live load factors were obtained. The live load factors, were proposed as a function of ADTT. ADTT values of these sites correspond to three different levels which are approximately ADTT= 5,000, ADTT = 1,500 and ADTT ≤ 500 cases. WIM data for a full year were used from each site in the calibration procedure. Load effects were projected into the future for the different span lengths considering five-year evaluation period and seventy-five-years design life. The live load factor for ADTT=5,000, AASHTO HS20 loading case and five-year evaluation period was obtained as 1.8. In the second approach, the methodology established in the Manual for Bridge Evaluation (MBE) was used to calibrate the live load factors. It was obtained that the calculated live load factors were smaller than those in the MBE specifications, and smaller than those used in the initial calibration which did not convert to the gross vehicle weight (GVW) into truck type 3S2 defined by AASHTO equivalents.