• Title/Summary/Keyword: Similarity Test

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Air Similarity Test for the Evaluation of Aerodynamic Performance of Steam Turbine (스팀터빈의 공력성능 평가를 위한 공기 상사실험)

  • Lim, Byeung-Jun;Lee, Eun-Seok;Lee, Ik-Hyoung;Kim, Young-Sang;Kwon, Gee-Bum
    • 유체기계공업학회:학술대회논문집
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    • 2003.12a
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    • pp.73-79
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    • 2003
  • The steam turbine efficiency is an important factor in power plant. Accurate evaluation of steam turbine performance is essential. However, it is not easy to evaluate the steam turbine performance due to its high temperature and high pressure circumstance. Therefore most steam turbine performance tests were conducted by air similarity test. This paper described a test program for air similarity test of steam turbine at Korea Aerospace Research Institute. A test facility has been designed and built to evaluate aerodynamic performance of turbines. The test facility consists of air supply system, single stage test section, power absorption system, instrumentation and auxiliary system. For evaluation of steam turbine performance, the test of single stage axial turbine air similarity performance was conducted and uncertainty analysis was performed.

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Air Similarity Test and Analysis of Steam Turbine Labyrinth Seal for Leakage Verification (스팀터빈용 래비린스 실의 누설량 규명을 위한 공기상사 실험 및 해석)

  • Ahn, Sang-Kyu;Kim, Seung-Jong;Lee, Yong-Bok;Kim, Chang-Ho;Ha, Tae-Wong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.05a
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    • pp.1149-1149
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    • 2006
  • The leakage characteristic is an important factor in power plant. However, most of power plant have efficiency problem which is occurred leaking between high pressure steam turbine axle and stator. The labyrinth seal which is used between the main turbine axle and stator in the power plant. Because it is able to be non-contact seal and it is minimize clearance to decrease the leakage. But its actual system is too huge to experiment. Therefore, most steam turbine seal performance tests were conducted by air similarity test. This paper described a test facility and program for air similarity test of high pressure steam turbine seal. A test facility has been designed and built to evaluate leakage verification of labyrinth seal. The test facility consist of air compressor, anti-swirl labyrinth seal for 1/3 air similarity model, pressure transducer, air flow measure system, instrumentation and auxiliary system. For evaluation of steam turbine seal performance, the air similarity test of labyrinth seal leakage verification was conducted and we compared experiment data and analysis result.

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Air Similarity Test for the Evaluation of Aerodynamic Performance of Steam Turbine (스팀터빈의 공력성능 평가를 위한 공기 상사실험)

  • Lim, Byeung-Jun;Lee, Eun-Seok;Yang, Soo-Seok;Lee, Ik-Hyoung;Kim, Young-Sang;Kwon, Gee-Bum
    • The KSFM Journal of Fluid Machinery
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    • v.7 no.5 s.26
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    • pp.29-35
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    • 2004
  • The turbine efficiency is an important factor in power plant, and accurate evaluation of steam turbine performance is the key issue in turbo machinery industry. The difficulty of evaluating the steam turbine performance due to its high steam temperature and pressure environment makes the most steam turbine tests to be replaced by air similarity test. This paper presents how to decide the similarity conditions of the steam turbine test and describes its limitations and assumptions. The test facility was developed and arranged to conduct an air similarity turbine performance test with various inlet pressure, temperature and mass flow rate. The eddy-current type dynamometer measures the turbine-generated shaft power and controls the rotating speed. Pressure ratio of turbine can be controled by back pressure control valve. To verify its test results, uncertainty analysis was performed and relative uncertainty of turbine efficiency was obtained.

Stability of the classifier based on fuzzy similarity in generalized Lukasiewicz Structure

  • Sampo, J.;Luukka, P.
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.1324-1329
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    • 2004
  • In this article we have tested stability of classifier based on fuzzy similarity in generalized Lukasiewicz structure. Two different tests for stability was made:In on test stability was checked respect to weight parameters and other test was carried out for idealvectors. Tests have made with three different classification problems.

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Similarity rule of Seepage failure by Centrifuge model test (원심모형시험기를 이용한 사면의 침투 및 파괴에 관한 상사법칙의 검토)

  • Kim, Jae-Young;Jun, Tohda
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.313-318
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    • 2004
  • When plan breakdown by permeation of fill dam, bank by original decision scale model test of sound, original decision scale model test of sound that destroy having used water was carried out. And original decision scale model test of sound that use viscous fluid is carried out, but doubt remains in experiment result in state that verification of law of similarity is not achieved. In this study, verified according to Modeling of Models' method effecting law of similarity to use n ship horoscope solution of water.

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Air Similarity Performance Test of Turbopump Turbine (터보펌프용 터빈 공기상사 성능시험)

  • Lim Byeung-Jun;Hong Chang-Uk;Kim Jin-Han
    • Journal of the Korean Society of Propulsion Engineers
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    • v.10 no.2
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    • pp.39-45
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    • 2006
  • In liquid rocket engine turbopump, it is difficult to evaluate turbine performance for high pressure, high temperature circumstance. Turbine test is often done by using air at similarity condition so that the turbine can be tested at lower risk. This paper describes an air similarity test program of liquid rocket engine turbopump turbine. A test facility has been built to evaluate aerodynamic performance of turbines. The test facility consists of high pressure air supply system, mass flow rate measuring nozzle, test section, hydraulic break, exit orifice for pressure control, instrumentation and control system. This paper also presents how to decide the similarity conditions of the turbine test and describes how to control test conditions. Relative standard deviation of measurement parameter was less than 1% and measured turbine efficiency corresponded with analysis result within 2%.

ASSESSMENT OF CONCRETE AND ABSTRACT THINKING OF CHILD-PSYCHIATRIC CHILDREN WITH THE DRAW-A-PERSON TEST AND KEDI-WISC SIMILARITY TEST (인물화 검사와 KEDI-WISC 공통성 소검사를 통한 소아 정신과 아동의 구체적 사고와 추상적 사고의 평가)

  • Shin, Min-Sup;Kim, In-Ju
    • Journal of the Korean Academy of Child and Adolescent Psychiatry
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    • v.10 no.2
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    • pp.186-194
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    • 1999
  • Objective:This study was conducted to examine the Draw-A-Person test as a non-verbal indicator of concrete and abstract thinking. Method:Thirty child-psychiatric children and 27 normal children were individually assessed with Draw-A-person Test and KEDI-WISC, and the scores were compared between similarity test and DAP. Results:The results showed significant differences between the groups. In clinical group, there were significant correlations with DAP scores and similarity test scores, especially abstract scores on DAP were highly correlated with similarity test scores. Results indicate characteristics of abstract thinking may be more discernable on the DAP than concrete thinking in clinical group.

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Experimental Investigation of Performance for Supersonic Impulse Turbine (초음속 충동형 터빈의 성능에 대한 시험적 고찰)

  • Lee, Hang-Gi;Jeong, Eun-Hwan;Kim, Jin-Han
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.561-565
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    • 2009
  • The performance of supersonic impulse turbine was investigated experimentally. Experiment was performed with the compressed air instead of the high temperature burned gas because of the limitation of test facility and danger. As a result of the experiment with the compressed air, the performance in the real gas(burned gas) was predicted by the similarity method. The nozzle area of prototype turbine was calculated based on the real gas. So, it is difficult to satisfy the similarity conditions completely. Two similarity conditions were set and the design point for real gas was existed between two similarity conditions. And, the new turbine test model with calculated nozzle area based on the compressed air was tested. Therefore, similarity point of the new turbine test model was also existed between above two similarity points. It means that the design point for real gas was similar to the test point with the new turbine model.

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Performance Prediction of Model Mixed Flow Pump Using Similarity (상사성을 이용한 model 사류펌프의 성능 예측)

  • Lee, Duck-Hyong
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.393-400
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    • 2005
  • As one of the useful and powerful methods for designing the optimum pump is using model pump, it is based on the similarity characteristics of turbomachinery. With this theory, we can predict the performance of various pumps. In fact we have performed huge pumps using this, the experimental results were to be sufficient to prove the similarity characteristics. In this study, we predicted the performance of the huge proto-type pump that cannot be installed and made a test. First of all, we had calculated the model ratio between proto-type and model. There were two ways to estimate the performance. One was the application of CFD code, and the other way was model field test. So We selected both of them to guarantee the dependable data and evaluated each other.

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A Comparison between Factor Structure and Semantic Representation of Personality Test Items Using Latent Semantic Analysis (잠재의미분석을 활용한 성격검사문항의 의미표상과 요인구조의 비교)

  • Park, Sungjoon;Park, Heeyoung;Kim, Cheongtag
    • Korean Journal of Cognitive Science
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    • v.30 no.3
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    • pp.133-156
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    • 2019
  • To investigate how personality test items are understood by participants, their semantic representations were explored by Latent Semantic Analysis, In this thesis, Semantic Similarity Matrix was proposed, which contains cosine similarity of semantic representations between test items and personality traits. The matrix was compared to traditional factor loading matrix. In preliminary study, semantic space was constructed from the passages describing the five traits, collected from 154 undergraduate participants. In study 1, positive correlation was observed between the factor loading matrix of Korean shorten BFI and its semantic similarity matrix. In study 2, short personality test was constructed from semantic similarity matrix, and observed that its factor loading matrix was positively correlated with the semantic similarity matrix as well. In conclusion, the results implies that the factor structure of personality test can be inferred from semantic similarity between the items and factors.