• Title/Summary/Keyword: test system

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A Study on the Development of Testing Models and Its Design System for the Comprehensive Performance Test of the Substation Automation System (변전자동화 종합 성능시험을 위한 시험모델 및 설계시스템 개발에 관한 연구)

  • Lee, Nam-Ho;Jang, Byung-Tae
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.7
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    • pp.63-71
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    • 2011
  • Due to the rapid development of digital technnology and informantion communication, in the IEC 61850 based substation automation system, the innovative paradigm shift is expected and also required in many substation-related jobs, especially in the device function test area Accordingly a common testing model which can simplify the complex contents of the SAS performance test performed by test engineers has been identified, that can overcome limitations of engineers' own testing knowledge and experience. Testing models and its design system for the comprehensive performance test of the Substation Automation System is developed and the result of the study is reported in this paper.

A Sea-Trial Test of a Pendulum-type Mass Driving Anti-Rolling System for Small Ships (소형 선박용 진자식 횡동요 저감장치의 실선시험)

  • 문석준;박찬일;정종안;김병인;윤현규
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.438-441
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    • 2004
  • Reduction of a ship's rolling is the most important performance requirement for improving the safety of the crew on board and preventing damage to cargos as well as improving the comfort of the ride. A mass driving anti-rolling system (MD-ARS) might be one candidate of several systems against the ship's rolling. In this paper, a sea-trial test on a pendulum-type MD-ARS passively operated is carried out in Suyoung, Busan. After the system is installed on the cabin of the small leisure boat, a series of test is conducted before and after operating the system. Through the test, it is confirmed that the roll rate of the ship is pretty well reduced by the system.

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A Evaluation of Maintenance History for K-AGT (한국형 경량전철시스템의 유지보수 이력에 대한 평가)

  • Lee, Ho-Yong;Ryu, Sang-Hwan;Cho, Hong-Shik;Cho, Bong-Kwan;Jang, Yul
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1014-1023
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    • 2008
  • The K-AGT test line is managed similarly to revenue operation and operated automatically 120km per day, total 90,000km from August 2004 to December 2007. To enhance reliability of developed system, maintenance information system based on RCM is applied. The maintenance program applied in test line is based on RCM which prevent a fault before it happens and a fault made in test line is analysed by reliability growth test. Vehicle system, power supply system, signalling system, track and infrastructure are built in test line and it is reviewed enhancing system performance and changing designs to commercialize through reliability growth analysis method.

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Active Vibration Measuring Sensor for Nondestructive Test of Electric Power Transmission Line Insulators (송전선로 애자의 비파괴 검사를 위한 능동형 진동 측정센서)

  • Lee, Jae-Kyung;Park, Joon-Young;Cho, Byung-Hak
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.4
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    • pp.424-430
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    • 2008
  • A new active vibration measurement system in electric power transmission line is presented, using in the nondestructive test. With a permanent magnet and a couple of coils, the system exerts impact force to a test object and in turn picks up the vibration of the object. The natural frequency with the amplitude obtained from the system are used as a basis for the detection of defects in the object. The system is controlled by an electronic device designed to facilitate the fully automated testing process with consistent repeatability and reliability which are essential to the nondestructive test. The system is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes.

Design and Performance Evaluation of DC Generator Control System for Cortrolling Torque of Rotating Shaft (회전축의 정밀 토그 발생용 직류 발전기 제어장치의 설계 및 성능평가에 관한 연구)

  • Kim, G.S.;Kang, D.I.;Ahn, B.D.
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.6
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    • pp.50-56
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    • 1994
  • A DC generator control system was designed to control the torque of a rotating shaft precisely. The control system is composed of a strain gage type torque cell, a torque cell amplifier, a computer, a D/A converter, a error detector, a DC voltage amplifier and a resistor. The response test under unit step input and the dynamic stability test for the designed control system were carried out. It was confirmed that the settling time from the response test is about 4 s and the error from the dynamic stability test is less than 0.06% of rated output of torque cell. The designed control system may be used to control a DC generator which may be used to apply torque to a rotating shaft.

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A Study On Field Test of IGBT Type Propulsion System for Electric Locomotive (전동차용 IGBT형 추진제어장치의 본선시험에 관한 연구)

  • 박건태
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.576-580
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    • 2000
  • This paper describes about the field test of IGBT VVVF inverter for the propulsion system. The 1650kV class IGBT VVVF inverter has been developed. Therefore the field test is performed in SMG 6 Line to confirm its the reliability and performance. The train consists of 4M4T and the electrical equipment for field test are as follows : VVVF inverter 4 sets 16 traction motors and 3 SIVs The propulsion system which have the excellent acceleration/deceleration and the jerk chracteristics as well as starting ability on slope are taken through the field test.

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A Novel Approach for Deriving Test Scenarios and Test Cases from Events

  • Singh, Sandeep K.;Sabharwal, Sangeeta;Gupta, J.P.
    • Journal of Information Processing Systems
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    • v.8 no.2
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    • pp.213-240
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    • 2012
  • Safety critical systems, real time systems, and event-based systems have a complex set of events and their own interdependency, which makes them difficult to test ma Safety critic Safety critical systems, real time systems, and event-based systems have a complex set of events and their own interdependency, which makes them difficult to test manually. In order to cut down on costs, save time, and increase reliability, the model based testing approach is the best solution. Such an approach does not require applications or codes prior to generating test cases, so it leads to the early detection of faults, which helps in reducing the development time. Several model-based testing approaches have used different UML models but very few works have been reported to show the generation of test cases that use events. Test cases that use events are an apt choice for these types of systems. However, these works have considered events that happen at a user interface level in a system while other events that happen in a system are not considered. Such works have limited applications in testing the GUI of a system. In this paper, a novel model-based testing approach is presented using business events, state events, and control events that have been captured directly from requirement specifications. The proposed approach documents events in event templates and then builds an event-flow model and a fault model for a system. Test coverage criterion and an algorithm are designed using these models to generate event sequence based test scenarios and test cases. Unlike other event based approaches, our approach is able to detect the proposed faults in a system. A prototype tool is developed to automate and evaluate the applicability of the entire process. Results have shown that the proposed approach and supportive tool is able to successfully derive test scenarios and test cases from the requirement specifications of safety critical systems, real time systems, and event based systems.

전기체 구조시험 설비 감시 시스템

  • Chae, Dong-Chul;Hwang, Gui-Chul;Song, Jae-Chang;Shim, Jae-Yeul
    • Aerospace Engineering and Technology
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    • v.2 no.1
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    • pp.29-34
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    • 2003
  • Full-scale test facility is a huge system which is integrated by many subsystems. There are several critical elements in test facility system. Those elements may cause undesirably test article failure during testing. Therefore, test facility monitoring system which indicates the operating status of the critical elements is required for performing full-scale structural test. Selection of critical element and design of this monitoring system are explained in detail in this paper. The monitoring system developed are being applied to T-50 full-scale static test, will be expended for full-scale fatigue test in the near future.

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A Dynamic Test Facility for Mobile Air Conditioning Systems

  • Gado, Amr;Hwang, Yun-Ho;Radermacher, Reinhard
    • International Journal of Air-Conditioning and Refrigeration
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    • v.15 no.4
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    • pp.147-155
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    • 2007
  • Mobile air conditioning systems work under widely changing operating conditions. To understand the system behavior under such dynamic conditions, a test facility that can impose transient loads as well as conducting dynamic measurements is needed. To test mobile air conditioning systems including their dynamic performance under various drive cycle patterns without using full scale vehicles in a wind tunnel, a new test facility, called "dynamic simulator," is described. It can replicate real vehicle operating conditions by interacting with the system being tested based on the measured system performance and subsequently adjusting the air properties returning to the test system based on the results of a numerical cabin model. A new dynamic simulator has been designed, constructed, and verified for performing dynamic tests. It was successful in controlling the temperature and relative humidity of the air returning to the test unit within ${\pm}0.7^{\circ}C$ and ${\pm}4%$ of their respective intended values. The verification test under the New European Driving Cycle demonstrated that detailed transient behavior of the mobile air conditioning system could be measured by using this dynamic simulator.

Development of a Test Environment for Performance Evaluation of the Vision-aided Navigation System for VTOL UAVs (수직 이착륙 무인 항공기용 영상보정항법 시스템 성능평가를 위한 검증환경 개발)

  • Sebeen Park;Hyuncheol Shin;Chul Joo Chung
    • Journal of Advanced Navigation Technology
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    • v.27 no.6
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    • pp.788-797
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    • 2023
  • In this paper, we introduced a test environment to test a vision-aided navigation system, as an alternative navigation system when global positioning system (GPS) is unavailable, for vertical take-off and landing (VTOL) unmanned aerial system. It is efficient to use a virtual environment to test and evaluate the vision-aided navigation system under development, but currently no suitable equipment has been developed in Korea. Thus, the proposed test environment is developed to evaluate the performance of the navigation system by generating input signal modeling and simulating operation environment of the system, and by monitoring output signal. This paper comprehensively describes research procedure from derivation of requirements specifications to hardware/software design according to the requirements, and production of the test environment. This test environment was used for evaluating the vision-aided navigation algorithm which we are developing, and conducting simulation based pre-flight tests.