• Title/Summary/Keyword: Test 1

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Evaluation Criteria of Reliability on Transmission Control Unit for Passenger Car

  • Choi, M.;Ryu, S.;Lim, J.H.;Jeong, H.S.
    • International Journal of Reliability and Applications
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    • v.11 no.1
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    • pp.55-67
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    • 2010
  • There has been a recent upsurge in demand for the improvement of car reliability in the Northern American which is the primary market of South Korea automobile industry. It has been required that the warranty for transmission control unit for passenger cars directly related to passenger safety or security should be extended for 10 years and 160,000 km. In this paper, the test method for reliability and evaluation criteria is presented to evaluate the reliability on the automatic transmission controller. Reliability certification test can be roughly divided into two types: a quality test and life assessment test and a quality test can be subdivided into a basic performance test and environmental resistance test. There are 3 types of tests on the performance test for automatic transmission controller and environmental resistance test is composed of 14 items. Life test is performed with only the product passed this quality test. In this study, operation limit test at the high-temperatures, accelerated life test under specific temperature and accelerated life test for 2 or 3 stress levels are shown as a way for life test.

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Design of Test Pattern Generator and Signature Analyzer for Built-In Pseudoexhaustive Test of Sequential Circuits (순서회로의 Built-In Pseudoexhaustive Test을 위한 테스트 패턴 생성기 및 응답 분석기의 설계)

  • Kim, Yeon-Suk
    • The Transactions of the Korea Information Processing Society
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    • v.1 no.2
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    • pp.272-278
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    • 1994
  • The paper proposes a test pattern generator and a signature analyzer for pseudoexhaustive testing of the combinational circuit part within a sequential circuit when performing built-in self test of the circuit. The test pattern generator can scan in the seed test pattern and generate exhaustive test patterns. The signature analyzer can perform the analysis of the circuit response and scan out the result. Such test pattern generator and signature analyzer have been developed using SRL(shift register latch) and LFSR(linear feedback shift register).

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Environmental Test Specifications for Automotive Electrical Units (자동차 전장품의 환경시험규격에 관한 연구)

  • Kim, Yong Soo
    • Journal of Korean Society for Quality Management
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    • v.46 no.2
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    • pp.311-326
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    • 2018
  • Purpose: Using international specifications, this study classified international standards and automobile manufacturers' test items based on the kind of test used and determined the test order for ISO 16750. Methods: The effects of international standards' environmental factors were examined, based on the major impacts of the product and the results of product failure. Automobile manufacturers' test items were compared with the test item in the ISO 16750. A generic algorithm was then used to determine the test sequence for ISO 16750. Results: International standards and automobile manufacturers' common test items were classified. The test sequence of ISO 16750 was determined for five cases. Conclusion: Although mechanical and environmental tests share many common features, there are differences in the details of the tests. There is a common sequence of tests, but weights are allocated tests differently.

A Study on the Test & Evaluation Process of Civil Aircraft for Compliance (적합성 입증을 위한 민항기 시험평가 절차 연구)

  • Kim, Kwang Hae;Choi, Nag Sun;Koh, Dae Woo
    • Journal of the Korean Society of Systems Engineering
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    • v.6 no.1
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    • pp.25-32
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    • 2010
  • The Test and Evaluation (T&E) process is an integral part of the Systems Engineering Process. The purpose of Test and Evaluation (T&E) in a system development is to identify the areas of risk to be reduced or eliminated. In this study, when develop aircraft of Civil Aviation with development experience of Military Aircraft, it is that establish Test and Evaluation process. Test and Evaluation for KC-100 small aircraft development can divide to certification test and development test. Certification test is proved compliance about Korea Airworthiness standard (KAS Part 23), through Development Test verify required performance of aircraft. These Test and Evaluation Process is more efficient and optimized.

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The Study on the Variation of Pass-by-Noise level due to ISO Road (ISO 노면의 Pass-by-Noise Level 편차에 관한 연구)

  • 김기전;배철용;노국희
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.371-376
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    • 2003
  • The objective of this paper is to compare the site-to-site variability of ISO 10844 pass-by-noise test sites. In order to investigate the site-to-site variance of test surfaces, European commercial tires are tested at seven different test sites. Three Korea test sites and four Europe test sites are selected.. The pass by noise test is executed according to a 2001/43/EC regulation. A]though the ISO surface has a very specific track composition, it does not reduce the variation of pass-by-noise measurements over the surface of test sites. This paper shows that the test results of pass-by-noise level are different depending on the test sites. The correlation obtained in this work is able to predict the pass by noise level for certain test site using the data measured from another test site. 17he prediction value is range with an error within 1dB(A).

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The Basic Applicability Study of the Roller Test Rig using Numerical Analysis (수치해석을 이용한 철도차량 동특성 주행시험기 활용성 기초 검토)

  • Chung Woo-Jin;Chung Heung-Chai
    • Journal of the Korean Society for Railway
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    • v.8 no.1
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    • pp.101-109
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    • 2005
  • Roller test rig is the test facility for acquiring the data related dynamic characteristics of rolling stocks handily. The test method using roller test rig could be convenient to Set information about hunting and others rather than using field test. However, adopting this method brings about the inconvenient calibration process for measured data. This kind of additional effort results from the difference of contact condition between field test and test roller rig. In this paper, the numerical approach is used to get the amount of calibration. The analysis results of the field test are compared with results of the roller test rig to know what kind of alternation happens according to the change of contact condition.

Loading Test Results of Wind Turbine Pitch/Yaw Bearing (풍력발전기용 피치/요 베어링의 하중 시험 결과)

  • Nam, Ju-Seok;Kim, Heung-Sub;Lee, Young-Soo;Han, Jeong-Woo
    • Journal of Wind Energy
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    • v.3 no.1
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    • pp.61-67
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    • 2012
  • The loading test of wind turbine pitch and yaw bearings have been conducted using special test rig designed for the test of large slewing bearings. Test type was fatigue test that applied fatigue load to each bearing and followed the defined test process. Measurement data during test were rotational torque and raceway temperature, and inspected key components by disassembling the bearing after all test finished. As a results, the raceway temperature during test did not exceed the operational temperature range of lubricant and rotational torque was reduced as the bearing's rotational cycle increased. In the inspection of key components, some plastic deformation and flaking were detected at some raceway sections while other components such as ball, spacer and seal remain indefective conditions.

Development of Coolant Flow Simulation System for Nuclear Fuel Test Rigs (핵연료조사리그 냉각수 유동 모의장치 개발)

  • Hong, Jintae;Joung, Chang-Young;Heo, Sung-Ho;Kim, Ka-Hye
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.1
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    • pp.117-123
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    • 2015
  • To remove heat generated during a burn-up test of nuclear fuels, the heat generation rate of nuclear fuels should be calculated accurately, and a coolant should be circulated in the test loop at an adequate flow rate. HANARO is an open pool-type reactor with an independent test loop for the burn-up test of nuclear fuels. A test rig is installed in the test loop, and a coolant is circulated through the test loop to maintain the temperature of the nuclear fuel rods within a desired temperature during an irradiation test. The components and sensors in the test rig can be broken or malfunction owing to the flow-induced vibration. In this study, a coolant flow simulation system was developed to verify and confirm the soundness of components and sensors assembled in the test rig with a high flow rate of the coolant.

A Study of the Construction of Comprehensive Flight Testing Infrastructure to Increase Aviation Safety (항공안전 증진을 위한 비행종합시험 인프라 구축 방안 연구)

  • Kim, Seung-Han;Kim, Gyou-Beom;Yim, Jae-Hyun
    • Journal of Convergence for Information Technology
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    • v.10 no.9
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    • pp.147-153
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    • 2020
  • As demand for drone test flight is rapidly increasing, it is difficult for Goheung Aviation Center alone to meet the test flight demand. Newly developed drones or modified existing aircraft carry potential flight risks due to unpredictable flight performance or poor pilot skill when performing test flights outside the test site. Therefore, it is necessary to ensure sufficient test flight space for the safety verification of manned and unmanned aircraft. Therefore, this study analyzed the status of domestic flight test site and chapter 5 of ICAO DOC 9184-AN / 902 Part 1 (Airport Planning Manual). And to build a comprehensive flight test infrastructure, the methodology for preliminary evaluation of candidate sites for flight test sites and a method for evaluating infrastructure test sites was presented.

CONCEPT AND THEORY OF TEST ANXIETY (시험불안(試驗不安)의 개념(槪念)과 이론(理論))

  • Cho, Soo-Churl
    • Journal of the Korean Academy of Child and Adolescent Psychiatry
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    • v.2 no.1
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    • pp.3-10
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    • 1991
  • Test situations are relatively specific and are experienced by everyone. The major purposes of this overview are to review the current concepts and theories of test anxiety and based on this review to suggest future directions in test anxiety theory and research. Test anxiety can be explained in terms of drive-oriented approach. trait-state anxiety theory, cognitive theory, cognitive and emotional approach, and psychodynamic theory. Usually, high test-anxious students keep the following characteristics : 1) The test situation is seen as difficult, challenging and threatening. 2) The individual sees himself as ineffective, and inadequate in handling the task at hand. 3) The individual focuses on undesirable consequences of personal inadequacy. 4) Self-deprecatory preoccupations are strong and interfere or compete with task-relevant cognitive activity. 5) The individual expects and anticipates failure and loss of regard by others. Future directions in test anxiety research should be focused to elucidate the nature and construct of test anxiety and the etiological factors of test anxiety by conducting research on the relationship between parental or social attitude and test anxiety. The effects of test anxiety on memory, attention, and cue utilization should be performed to elucidate the relationship between test anxiety and performance.

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