• 제목/요약/키워드: real-time test

검색결과 2,822건 처리시간 0.037초

Development of KOMPSAT-2 Vehicle Dynamic Simulator for Attitude Control Subsystem Functional Verification

  • Suk, Byong-Suk;Lyou, Joon
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2003년도 ICCAS
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    • pp.1465-1469
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    • 2003
  • In general satellite verification process, the AOCS (Attitude & Orbit Control Subsystem) should be verified through several kinds of verification test which can be divided into two major category like FBT (Fixed Bed Test) and polarity test. And each test performed in different levels such as ETB (Electrical Test Bed) and satellite level. The test method of FBT is to simulate satellite dynamics with sensors and actuators supported by necessary environmental models in ETB level. The VDS (Vehicle Dynamic Simulator) try to make the real situation as possible as the on-board processor will undergo after launch. The purpose of FBT test is to verify that attitude control logic function and hardware interface is designed as expected with closed loop simulation. The VDS is one of major equipments for performing FBT and consists of software and hardware parts. The VDS operates in VME environments with target board, several commercial boards and custom boards based on the VxWorks real time operating system. In order to make time synchronization between VDS and satellite on-board processor, high reliable semaphore was implemented to make synchronization with the interrupt signal from on-board processor. In this paper, the real-time operating environment used on VDS equipment is introduced, and the hardware and software configurations of VDS summarized in the systematic point of view. Also, we try to figure out the operational concept of VDS and AOCS verification test method with close-loop simulation.

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PXI embedded real-time controller를 이용한 Bimodal-tram Simulator (Bimodal-tram Simulator using PXI Embedded Real-time Controllers)

  • 변윤섭;김영철
    • 전기학회논문지
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    • 제59권3호
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    • pp.645-650
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    • 2010
  • In this paper we present the Bimodal-tram simulator using the PXI embedded real-time controllers. The Bimodal-tram is developed in KRRI (Korea Railroad Research Institute). The vehicle can be automatically operated by navigation control system (NCS). For the automatic driving, the vehicle lanes will be marked with permanent magnets that are placed in the ground. The vehicle is controlled by NCS. NCS governs the manual mode and automatic mode driving. The simulator is designed by an identical conception with the real control condition. The dynamic motion of vehicle is simulated by the nonlinear dynamic model. The control computer calculates the control values. The signal interface is linked by CAN communication. The simulation is processed by real-time base. The test driver can see the graphic motion of vehicle and can operate the steering wheel, gas and brake pedal to control direction and velocity of vehicle during the simulation. At present, the simulator is only operated by manual mode. The automatic mode will be linked after the control algorithm is finished. We will use the simulator to develop the control algorithm in the automatic mode. This paper shows the simulator designed for Bimodal-tram using real-time based controller. The results of the test using the simulator are presented and discussed.

실시간 Hardware-in-the-Loop 시뮬레이션을 이용한 반능동 현가시스템 특성 평가 (A Strategy to Evaluate Semi-Active Suspension System using Real-Time Hardware-in-the-Loop Simulation)

  • 최규재;노기한;유영면;김혁
    • 한국자동차공학회논문집
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    • 제9권6호
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    • pp.186-194
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    • 2001
  • To meet the challenge of testing increasingly complex automotive control systems, the real-time hardware-in-the-loop(HIL) simulation technology has been developed. In this paper, a strategy for evaluation of semiactive suspension systems using real-time HIL simulation is presented. A multibody vehicle model is adopted to simulate vehicle dynamic motions accurately. Accuracy of the vehicle simulation results is compared to that of the real vehicle field test and proven to be very accurate. The controller and stepping motor to adjust semi-active damper stage are equipped as external hardwares and connected to the real-time computer which has vehicle dynamic model. Open and closed loop test methods are used to evaluate a controlled suspension system and the system's operations are verified it is found that the proposed evaluation methods can be used well for the verification of semi-active suspension systems.

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인버터 장치 실험용 영구자석 동기전동기의 실시간 시뮬레이터 설계 (Design of a Real Time Simulator for Inverter Unit Test of PM Synchronous Motor)

  • 오현철;안병웅;조관열;김학원;조정구;문용기
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2013년도 전력전자학술대회 논문집
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    • pp.116-117
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    • 2013
  • The real time simulator for testing the high power inverter unit of a PM synchronous motor is proposed. The power converter of the real time simulator can replaces the dynamo test equipment that consists of a PMSM(PM synchronous motor) and load unit. It is verified by the simulation that the real time simulator has a similar electrical and mechanical characteristics of the PM synchronous motor.

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윈도우즈 상에서 실시간 디바이스 드라이버를 위한 통합 미들웨어 (Integrated Middleware for Real-Time Device Drivers on Windows)

  • 조아라;송창인;이철훈
    • 한국콘텐츠학회논문지
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    • 제13권3호
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    • pp.22-31
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    • 2013
  • 최근 무기체계 산업에서 성능검증을 위해 사용되는 점검장비는 수락시험 시 데이터의 정밀성과 실시간성을 요구한다. 이러한 점검장비는 개발의 편의성을 위해 범용 운영체제인 윈도우즈를 사용하는데 윈도우즈의 경우 실시간성을 제공하지 못하는 문제가 있다. 따라서 본 논문에서는 군용 점검장비의 실시간 통신을 위해 윈도우즈 시스템에 실시간성을 제공하는 RTiK-MP(Real-Time implant Kernel-Multi Processor)을 이용한 통합 미들웨어를 설계 및 구현하였다. 또한 DLL(Dynamic Linking Library)을 사용하여 통합 미들웨어의 API(Application Program Interface)를 사용자에게 제공함으로써 기존의 복잡한 RTiK-MP의 내부 구현을 몰라도 개발이 용이하도록 개발의 편의성을 제공하였다. 본 논문은 군용 점검장비의 통신에 실시간성을 제공할 수 있는 통합 미들웨어를 설계 및 구현한 것으로써 많이 사용되는 TCP/IP LAN과 RS-232를 사용하였다. 마지막으로 성능검증을 위해 CPU 클럭 틱의 수를 반환하는 RDTSC 명령어를 사용하였고, 구현한 통합 미들웨어의 성능을 검증한 결과 TCP/IP 및 RS-232의 경우 각각 1ms 및 4ms 주기에서 오차범위 내에서 정상 동작함을 확인하였다.

Runtime Software Monitoring Based on Binary Code Translation for Real-Time Software

  • Choi, Kiho;Kim, Seongseop;Park, Daejin;Cho, Jeonghun
    • Journal of Information Processing Systems
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    • 제15권6호
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    • pp.1462-1471
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    • 2019
  • Real-time embedded systems have become pervasive in general industry. They also began to be applied in such domains as avionics, automotive, aerospace, healthcare, and industrial Internet. However, the system failure of such domains could result in catastrophic consequences. Runtime software testing is required in such domains that demands very high accuracy. Traditional runtime software testing based on handwork is very inefficient and time consuming. Hence, test automation methodologies in runtime is demanding. In this paper, we introduce a software testing system that translates a real-time software into a monitorable real-time software. The monitorable real-time software means the software provides the monitoring information in runtime. The monitoring target are time constraints of the input real-time software. We anticipate that our system lessens the burden of runtime software testing.

실시간교통정보 이용에 따른 가솔린차량의 온실가스 저감효과 평가 (Evaluating GHG Emissions Reduced by Real-time Traffic Information in Gasoline Vehicle)

  • 김준형;엄정섭
    • 한국대기환경학회지
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    • 제27권4호
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    • pp.443-453
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    • 2011
  • Real-time Traffic Information Service could play a key role in reducing incomplete combustion time remarkably since it can provide traffic information in real-time basis. Emission characteristics of test engines were studied in terms of travel distance and speed. The present study focused on a north district in Daegu, 12 km. The driving for the emission test was done at 8AM, 3PM, 7PM which represents various traffic conditions. The reduced emissions of Greenhouse Gases (GHG) have been measured for a travel distance running at different loads (conventional shortest route and Real-time Traffic Information) and GHG ($CO_2$, $CH_4$, $N_2O$) are all inventoried and calculated in terms of existing emission factors. The emission of GHG has been shown to reduce linearly with travel distance: $CO_2$ (9.15%), $CH_4$ (18.43%), $N_2O$(18.62%).

실시간 대규모 전력계통 해석용 시뮬레이터(KEPS)를 이용한 국산 디지털 PSS의 성능 시험 (The Performance Test of Digital PSS Using KEPCO Enhanced Pourer System Simulator(KEPS))

  • 신정훈;김태균;추진부;백영식
    • 대한전기학회논문지:전력기술부문A
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    • 제51권12호
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    • pp.611-623
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    • 2002
  • This paper introduce the real time digital simulator which is located in Korea Electric Power Research Institute. This paper also describes the methodology for the performance test of the PSS using KEPS. This test is to get a high degree of the confidence of the developed PSS before it is installed into the real power system. This has been performed in the form of closed-loop tests in which Simulator and PSS are connected and signals come and back interactively. Many tests have successfully done using KEPS which consists of 26 RTDS racks, under the large-scale power system. The simulated reduced KEPCO power system contains 88 generators and 295 buses. Through the AVR step, three phase fault and active power variation test, the effectiveness of developed PSS has been proved. This paper also presents the overview of KEPS and hardware of protype PSS.

광섬유 센서를 이용한 복합재 구조물의 실시간 파손감지 (Real-time Failure Detection of Composite Structures Using Optical Fiber Sensors)

  • 방형준;강현규;류치영;김대현;강동훈;홍창선;김천곤
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2000년도 추계학술발표대회 논문집
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    • pp.128-133
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    • 2000
  • The objective of this research is to develop real-time failure detection techniques for damage assessment of composite materials using optical fiber sensors. Signals from matrix cracking or fiber fracture in composite laminates are treated by signal processing unit in real-time. This paper describes the implementation of time-frequency analysis such as the Short Time Fourier Transform(STFT) to determine the time of occurrence of failure. In order to verify the performance of the optical fiber sensor for stress wave detection, we performed pencil break test with EFPI sensor and compared it with that of PZT. The EFPI sensor was embedded in composite beam to sense the failure signals and a tensile test was performed. The signals of the fiber optic sensor when damage occurred were characterized using STFT and wavelet transform. Failure detection system detected the moment of failure accurately and showed good sensitivity with the infinitesimal failure signal.

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실시간 시스템 개발을 위한 데이터 처리 시간과 프로세서 사용율 추정 기법 (An Estimation Scheme on Processing Time and Processor Utilization for Real-Time System Development)

  • 김한동;최태봉;고순주
    • 한국정보과학회:학술대회논문집
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    • 한국정보과학회 2005년도 한국컴퓨터종합학술대회 논문집 Vol.32 No.1 (A)
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    • pp.820-822
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    • 2005
  • The current paper is on a study of the performance estimation fer data processing time and CPU utilization to efficiently develop the real-time system. The analytical modeling and OPNET modeling and benchmarking tests are applied to perform the estimation for data processing time and CPU utilization in real-time system. We demonstrate that the estimation results can be predicted fairly and accurately through the benchmarking test results although there is a small variance between the estimation results and the benchmarking test results.

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