• Title, Summary, Keyword: Test center

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Design of an Altitude Test Facility for Turbo Shaft Engine

  • Choi, Young-Hwan;Park, Sang-Joon;Lee, Joon-Won;Kim, Chun-Taek;Cha, Bong-Jun;Ahn, Iee-Ki
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.173-181
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    • 2008
  • Gas turbine engine for aircraft are usually operated at the altitude condition which is quite different from the ground condition. In order to measure the precise performance data at the altitude condition, the engine should be tested at the altitude condition by a real flight test or an altitude simulation test with an altitude test facility. In this paper describes the design of altitude test facility for turbo shaft engine. This facility will be located in test cell #2 at the Korea Aerospace Research Institute. Test Cell #2 will be used for altitude testing engines with mass flow rate up to 40kg/s and inlet temperatures in the range from $-65^{\circ}C$ to $200^{\circ}C$. The existing compressor/exhauster station with heater & cooler system will be used to simulate altitude conditions in Test Cell #2.

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Study on Properties and Accelerated Life-time Test of Rubber O-ring by Temperature Stress

  • Shin, Young-Ju;Kang, Bong-Sung;Chung, Yu-Kyung;Choi, Kil-Yeong;Shin, Sei-Moon
    • Proceedings of the Korean Reliability Society Conference
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    • pp.48-54
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    • 2006
  • In this thesis, accelerated life test (ALT) method and procedure for rubber O-ring are applied to assure specified reliability of the products at guaranteeing the life of the products. Rubber O-ring is parts that keep intensity or make machine operation smoothly on attrition portion of machine and is used to prevent that oil is leaked. Usually. Rubber O-ring used NBR that is copolymer of acrylonitrile and butadiene. this are superior oil resistance, heat resistance, durability of abrasion, cold resistance, chemical resistance etc. The accelerated life test model for rubber O-ring are developed using the relationship between stresses and life characteristics of products. Using the accelerated life test method and the acceleration life test equipment which is developed, we performed life test, collected life data and analyzed the results of tests. The proposed accelerated life test method and procedure may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably.

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Biogenic Amines Formation and Content in Fermented Soybean Paste (Cheonggukjang) (청국장 중 biogenic amine의 함량 및 생성원인)

  • Han, Gyu-Hong;Cho, Tae-Yong;Yoo, Myung-Sang;Kim, Chun-Soo;Kim, Jung-Min;Kim, Hyun-Ah;Kim, Mi-Ok;Kim, Seong-Cheol;Lee, Sun-Ae;Ko, Yong-Suk;Kim, So-Hee;Kim, Dae-Byoung
    • Korean Journal of Food Science and Technology
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    • v.39 no.5
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    • pp.541-545
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    • 2007
  • The potential to produce biogenic amines was investigated in microbial strains isolated from fermented soybean paste, cheonggukjang. The typical levels of 11 biogenic amines, including putrescine, histamine, and tryptamine, were analyzed in commercial cheonggukjang. The tyramine and histamine levels in the samples ranged from 4.2 to 483.1 mg $kg^{-1}$ and 0.2 to $70.3mg\;kg^{-l}$, respectively. A total of 4 microbial strains of Bacillus sp. were isolated from cheonggukjang. The Bacillus sp. were identified as B. amyloliquefaciens, B. subtilis, and B. licheniformis based on phenotypic characteristics, which included using the VITEK system. The screening plate method for detecting amino acid decarboxylase positive microorganisms was performed. The results fer amino decarboxylation were positive, and biogenic amine formation was evaluated by the confirmation of amine-forming capacity.

Development of the Virtual Test Technology for Evaluating Thermal Performance of Disc Brake (브레이크 열적 성능 평가를 위한 Virtual Test 기술의 개발)

  • Choi, Bong-Keun;Park, Jong-Hyun;Kim, Mi-Ro;Ahn, Byung-Jae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.4
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    • pp.40-47
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    • 2009
  • There are many kinds of simplifications and limitations in evaluating thermal performance of disc brake using the analytic technologies which were established before. But now new virtual test technology with several advanced analytic techniques is developed to evaluate the thermal performance without any possibility of great errors that used to happen for the time-consuming analysis. As a result, it was estimated that the virtual test technology could afford to replace the physical dynamo test since the reliability of virtual test technology was reasonably verified with the existing data measured in dynamo test.

A configuration plan and future expectation of a power distribution test (배전실증시험장의 구성 방안 및 운용 예상효과 분석)

  • Jeong, Yeong-Ho;Kim, Sang-Joon;Park, Sang-Man
    • Proceedings of the KIEE Conference
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    • pp.829-831
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    • 1997
  • We investigated configuration plan and future expectation of the power distribution test center. The example of foreign country's test center was analyzed, and the required test facilities, test line, and power source for the operation of our test center were proposed.

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Test Methods of Sealing Material for Plastic Liquid Crystal Display Cells

  • Hsiao, C.C.;Liao, Y.C.;Chang, K.H.;Sha, Y.A.;Su, P.J.;Hsieh, C.H.;Shiu, J.W.;Fuh, S.Y.;Lin, C.Y.;Cheng, W.Y.;Yang, J.C.;Lo, K.L.;Lee, D.W.;Lee, K.C.;Chang, Y.P.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.830-833
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    • 2006
  • In this work, we provided a novel test method to verify the sealing materials for flexible LCD cell. The ultraviolet type curing sealing material with low process temperature was suitable for LCD cell assembly. We also proposed the sealing materials which passed 13200 times bending test within 20 mm curvature.

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Mechanical and Electrical Performance of 180kV HVDC Submarine Cable System (180kV HVDC 해저케이블 기계적/전기적 특성 평가)

  • Kim, N.Y.;Lee, T.H.;Lee, S.J.;Ji, B.K.;Kim, J.N.;Jeon, S.I.;Yun, H.S.;Joung, S.K.;Kang, C.H.;An, Y.H.
    • Proceedings of the KIEE Conference
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    • pp.616-618
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    • 2007
  • This paper describes the mechanical and electrical test on HVDC submarine cable, Flexible Repair Joint and termination for 180kV. This HVDC submarine cable was manufactured using LS cable's unique skill and would be applied the HVDC submarine cable system in korea. The performance test consist of mechanical test and electrical test. The tensile bending test and tensile test was done as the mechanical test and Electrical test is DC voltage and Impulse test. The tensile bending test carried out 6 times(double of specified times) for maximum reliability. The DC test voltage is $\pm$400kV/1hr. We estimate the lower limit of DC breakdown voltage is 600kV. The impulse test voltage is $\pm$800kV/10shots. The type of developed cables is the MI type. Its insulation consist of paper tapes impregnated with a high viscosity oil. The development of new HVDC cable is available for HVDC underground or submarine power transmission. The developed HVDC cable, FRJ and termination have passed the mechanical and electrical test successfully and showed excellent performance.

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A point of confusion for embryologists in the identification of viable spermatozoa by the eosin-nigrosin test

  • Chen, Huanhua;Zhou, Hong;Shu, Jinhui;Gan, Xianyou;Wang, Caizhu;Lin, Ruoyun
    • Clinical and Experimental Reproductive Medicine
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    • v.46 no.1
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    • pp.36-40
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    • 2019
  • A viable spermatozoon is a prerequisite for fertilization in intracytoplasmic sperm injection (ICSI). Thus, it is crucial to select viable but immotile spermatozoa on the day of ICSI. We report conflicting results in the identification of viable but immotile spermatozoa between the eosin-nigrosin staining and the laser test, which resulted in confusion for embryologists during assisted reproductive technology (ART). Three patients' semen samples that showed no motile spermatozoa are described in this report. To identify viable spermatozoa, we used both the eosin-nigrosin test and the laser test for each sample, and repeated the semen analysis twice in each patient. Viable but immotile spermatozoa selected by the laser test were used for ICSI. Viable spermatozoa were detected by both the eosin-nigrosin and laser tests in two patients (case 1, 95.00% vs. 24.21% and 92.68% vs. 22.22%; case 2, 41.18% vs. 23.48% and 39.81% vs. 22.52%), indicating consistent results between the two methods. In the third patient, the eosin-nigrosin test yielded viability rates of 20.75% and 19.14%, while the result of the laser test was 0%. Thus, testicular aspiration was performed to collect viable sperm from this patient. Normal fertilization was achieved after the injection of viable but immotile spermatozoa selected from these patients by the laser test, resulting in the birth of two healthy babies. Our study documents a case where the eosin-nigrosin test showed a limitation in identifying viable but immotile spermatozoa for ART, while the laser test may overcome this limitation. Larger samples may be required to corroborate the clinical value of the laser test.