• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.535-538
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• 2005

Today, most fixed-wing aircrafts are equipped with the antiskid brake system. It can modulate braking moments in the wheels optimally, when an aircraft is landing. So it can reduce landing distance and increase safeties. The antiskid brake system for an aircraft are mainly composed of braking moment modulators (hydraulic control valves) and brake control unit. In this paper, a Mark IV type - fully digital - brake controller is studied. For the development of its control algorithms, a 5-DOF (Degree of Freedom) aircraft landing model is composed in the form of matlab/simulink model at first. Then, braking moment control algorithms using wheel decelerations and slips are made. The developed algorithms are tested in software simulations using state-flow toolboxes in matlab/simulink model. Also, a real-time simulation systems are made, which use hydraulic brake systems of a real aircraft, pressure control valves and its controller as hardware components of HIL(Hardware In-the-Loop) simulation. Algorithms tested in software simulations are coded into the controller and the real-time landing simulations are made in very severe road conditions. The real-time simulation results are presented.

• 한국정보통신학회논문지
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• 제21권3호
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• pp.613-619
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• 2017

본 논문에서는 PMS(Power Management System) HILS(Hardware In the Loop Simulaition) 가상 제어기 환경 구축을 위하여 디젤과 LNG를 연료로 사용가능한 DF(Dual Fuel) Generator를 MATLAB/SIMULINK 기반으로 모델링을 수행하고 시뮬레이션 결과 모니터링이 가능한 인터페이스를 구현하였다. DF Generator의 주요 구성은 기계적 동력을 공급하는 DF 엔진과 기계적 동력을 받아 전력을 생산 및 공급을 하는 동기발전기가 있다. DF 엔진의 서브모델은 throttle body, intake manifold, torque generation 그리고 mass of LNG and diesel quantity 가 있다. 또한, 단일 용량을 초과하는 전체 부하를 공유하기 위하여 병렬 연결된 DF Generator 와 governor 모델을 이용하여 부하 분담 시스템을 구현하였다. 시뮬레이션 결과와 가상 부하에 따른 예상 결과의 비교를 통해 DF Generator 모델의 신뢰성을 검증하였다.

• 제어로봇시스템학회논문지
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• 제7권5호
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• pp.432-437
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• 2001

Korea High Speed Train(KHST) is supposed to run up 350km/h, in which the braking system has a crucial role for the safety of the train. In the design st데 of the braking system, its very hard to ac-quire information data for design guidelines. A HILS(Hardware-In-the-Loop Simulation) system can be used to get design data which could simulate the braking system of the real train in real-time. In this paper, cars are modelled including car dynamics, brake blending algorithms, pneumatic actuator dynamics, the models of each braking devices, adhesive coefficients, and soon. Real-time braking time, distance, and other design parameters are simulated using a DSP board and C language which shows the validity of the proposed method.

• 한국자동차공학회논문집
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• 제10권1호
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• pp.195-202
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• 2002

By using modeling and simulation. today's design engineers are simultaneously reducing time to market and decreasing the cost of development, while increasing the quality and reliability of their products. A driving simulator is the best example of this method and allows virtual designs of control systems, electronic systems, mechanical systems and hydraulic system of a vehicle to be evaluated before costly prototyping. The objective of this Paper is to develop the virtual Proving: ground using a driving simulator and to show its capabilities of an automotive system development tool. For this purpose, including a real-time vehicle dynamics analysis system, the PC-based driving simulator and the virtual proving ground are developed by using VR(Virtual Reality) techniques. Also ABS HIL(Hardware-In-the-Loop ) simulation is performed successfully.

• 한국시뮬레이션학회논문지
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• 제16권4호
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• pp.23-31
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• 2007

함정 전투체계의 대공전 기능은 전투함의 생존성을 결정짓는 핵심기능이다. 본 논문에서는 차기고속정 전투체계의 대공전 설계에 있어서 효과적인 개발 방법론으로 모델 기반의 시뮬레이션 기법을 적용하고 있다. 적용된 방법론에서는 대공전 기능이 유한상태기계시스템으로 모델링되고 있으며 모델링 결과로 부터 직접 시뮬레이션을 수행하는 모델기반의 시뮬레이션을 통해 모델의 정확성과 운용의 효과성을 평가하여 설계 시스템을 프로토타입핑하였다. 이러한 결과를 토대로 실제 시스템의 특성을 반영하기 위해 HILS 시뮬레이션을 수행하였으며 최종적으로 구현된 시스템을 완성하였다. 모델기반의 시뮬레이션 기법은 단계적이 반복적인 설계과정을 거치게 됨으로써 개발과정에서 발생할 수 있는 위험요소를 최소화 시킬 수 있기 때문에 고비용 및 고신뢰성이 요구되는 국방분야에서 효과적인 개발방법론으로 적용할 수 있다.

• 대한교통학회지
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• 제20권2호
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• pp.149-159
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• 2002

다이아몬드 인터체인지에서 사용되는 두 가지 유형의 3현시 신호 체계의 운영결과를 다양한 교통상황 하에서 분석하였다. 본 연구를 수행하기 위하여 Hardware-in-the-loop 장치를 CORSIM 프로그램과 연결하여 사용하였으며, 운영결과는 평균지체와 총 정지수의 두 가지 효과척도를 사용하여 평가하였다. 평가결과 두 가지 3현시 신호 체계는 평균적으로 평균지체에 관해서는 동일한 결과를 나타내었으나 총 정지수는 다른 결과를 나타내었다. 또한 평균지체는 교통패턴과 인터체인지 거리에 따라 큰 영향을 받는 것으로 파악되었다. 총 정지수는 인터체인지 거리가 증가함에 따라 감소되었고, 두 가지 3현시 신호체계의 운영효과를 비교 평가할 수 있는 척도로 평가되었다. 그리고 Hardware-in-the-loop 장치를 결합하여 현재 시뮬레이션 기술의 적용영역을 확장할 수 있음을 구현하여 예시하였다.

• Journal of Power Electronics
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• 제19권6호
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• pp.1496-1504
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• 2019

This paper proposes a new THD reduction algorithm for modular multilevel converters (MMCs) with offset voltage injection operated in nearest level modulation (NLM). High voltage direct current (HVDC) is actively introduced to the grid connection of offshore wind powers, and this paper deals with a voltage generation technique with an MMC for wind power generation. In the proposed method, third harmonic voltage is added for reducing the THD. The third harmonic voltage is adjusted so that each of the pole voltage magnitudes maintains a constant value with a maximum number of (N+1) levels, where N is the number of sub-modules per arm. By using the proposed method, the THD of the output voltage is mitigated without increasing the switching frequency. In addition, the proposed method has advantageous characteristics such as simple implementation. As a part of this study, this paper compares the THD results of the conventional method and the proposed method with offset voltage injection to reduce the THD. In this paper, simulations have been carried out to verify the effectiveness of the proposed scheme, and the proposed method is implemented by a HILS (Hardware in the Loop Simulation) system. The obtained results show agreement with the simulation results. It is confirmed that the new scheme achieved the maximum level output voltage and improved the THD quality.

• Journal of Electrical Engineering and Technology
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• 제8권6호
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• pp.1431-1438
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• 2013

A pack-level battery hardware-in-the-loop simulation (B-HILS) platform is implemented. It consists of dynamic vehicle models using PSAT and multiple control interfaces including real-time 3D driving and GPS mode. In real-time 3D driving mode, user can drive a virtual vehicle using actual drive equipment such as steering wheel and accelerator to generate the cycle profile of the battery. In GPS mode, actual road traffic and terrain effects can be simulated using GPS data while the trajectory is displayed on Google map. In the latter part of the paper, several performance tests of an actual lithium-polymer battery pack are carried out utilizing the developed system. All experiments are conducted as parts of actual development process of a commercial battery pack adopting 2nd generation Prius as a target vehicle model. Through the experiments, the low temperature performance and fuel efficiency of the battery are quantitatively investigated in comparison with the original nickel-metal hydride (NiMH) pack of the Prius.

• 한국항공우주학회지
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• 제43권8호
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• pp.731-738
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• 2015

항공기 비행제어시스템의 개발기간, 비용 및 위험도를 최소화시키기 위해서는 비행제어 법칙의 적용 및 시험을 효율적으로 수행할 수 있는 통합개발 도구와 Rapid Prototyping 프로세스가 요구된다. 본 논문에서는 Matlab/Simulink 환경을 통해 생성한 제어법칙 자동코드와 비행동역학 해석프로그램(HETLAS: HElicopter Trim, Linearization and Simulation)과의 연동 절차를 개발하여 시뮬레이션 평가를 효율적으로 수행할 수 있는 환경의 구축에 대해 기술하였다. 또한, 본 연구를 통해 제어법칙의 다양한 모드의 조종사 시뮬레이션 평가를 위해 HETLAS를 이용한 데스크탑 시뮬레이션 환경을 개발하고 조종성 시뮬레이터 및 HILS(Hardware In the Loop Simulation) 시험 환경과 효율적으로 연동하여 시험할 수 있는 절차를 개발하였다. 비행제어법칙 개발과정에서 HETLAS를 중심으로 한 해석/시험 환경을 개발함으로써 반복적인 제어법칙의 설계/해석 및 시험 절차를 효율적으로 수행할 수 있도록 하였다.

• 한국자동차공학회논문집
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• 제21권1호
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• pp.128-136
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• 2013

This study presents the development of Gateway Control Module using SAE J1939 protocol for the commercial vehicles. Presently, the load rate of CAN bus is increased by the single network composition and addition of new ECUs for development of intelligent vehicles. Because the embedded system of the integrated network control function has the errors of the CAN bus caused by the increase of ECU, it is needed for development of commercial vehicles. Also, this study presents the development of smart functions that can diagnosis CAN bus errors, fault diagnosis of ECU and basic function that arbitrates CAN bus between ECUs of commercial vehicle. GCM was designed for 4channel separation about Gateway function as solution of load rate decrease and smart functions. HILS(Hardware in the loop simulation)system that can achieve simulation about CAN Messages of all systems on vehicle was applied to evaluate performance and verification of all functions and performance. The load rate on CAN bus was decreased at using functions what was delivery, block and process of GCM. Through this, it was enabled to organize systematic architecture for gateway.