• Transactions of the Korean Society of Automotive Engineers
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• v.8 no.6
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• pp.267-278
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• 2000

Vehicle dynamic models in handing and stability analysis are divided into three groups: bicycle model, roll axis model and full vehicle model. Bicycle model is a simple linear model, which hag two wheels with load transfer being ignored. Roll axis model treats left and right wheels independently. In this model, load transfer has a great effect on nonlinearity of tire model. Effects of suspension system can be analyzed by using full vehicle model, which is included suspension stroke motions. In this paper, these models are validated and compared through comparison with road test, and the effects of suspension kinematics and compliance characteristics on vehicle motion are analyzed. In handling and stability analysis, roll axis model can simulate the real vehicle motion more accurately than full vehicle model. Compliance steer has a significant effect, but the effect of suspension kinematics is negligible.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.13 no.3
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• pp.237-245
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• 2008

We developed a computational method on coupled dynamics of tracked vehicle on seafloor and long flexible pipe. The tracked vehicle is modeled as rigid-body vehicle, and the linked flexible pipe is discretized according to a lumped-parameter model. The equations of motion of the rigid-body vehicle on the soft seafloor are combined with the governing equations of flexible pipe dynamics. Four Euler parameters method is used to express the orientations of the vehicle and the flexible pipe. In order to solve the nonlinear coupled dynamics of vehicle and flexible pipe an incremental-iterative formulation is implemented. For the time-domain integration $Newmark-\beta$ method is adopted. The total Jacobean matrix has been derived based on the incremental-iterative formulation. The interactions between the dynamics of flexible pipe and the mobility of the tracked vehicle on soft seafloor are investigated through numerical simulations in time domain.

• Journal of the KSME
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• v.28 no.2
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• pp.107-112
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• 1988

1970년대 초부터 기계시스템의 해석을 위한 컴퓨터 프로그램들이 소개되기 시작한 기계시스템의 동력학적 해석은, 해석 자체의 중요성 못지 않게 보다 나은 설계를 위해서도 필요하다고 사료 된다. 각 부품의 설계도 중요하지만, 시스템 전체를 다루는 해석도 중요한바, 앞으로 국내에서도 이 분야의 연구가 활발하여 자동차 산업에 많은 도움을 줄 수 있기를 바란다.

• KIPE Magazine
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• v.16 no.3
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• pp.42-48
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• 2011

전기철도차량은 차량의 운행에 필요한 전력 및 동력을 공급하기 위한 대용량 추진제어 컨버터/인버터, 소용량 스위칭모드 전원장치와 같은 전력변환장치와 견인전동기에 이르기까지 다양한 설비를 갖추고 있다. 전기철도차량의 성능평가는 전력변환장치와 견인전동기를 포함한 추진장치의 성능평가라 할 수 있을 정도로 많은 비중을 차지하고 있다. 한국철도기술연구원은 국토해양부로부터 지정받은 성능시험기관으로써 국내 다양한 철도차량의 성능평가를 수행하고 있다. 본 논문에서는 철도차량의 성능시험기준을 근간으로 철도차량용 추진제어 인버터와 견인전동기의 성능 시험평가에 대한 방법 및 다양한 성능 시험평가 사례에 대하여 소개하고자 한다.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.12
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• pp.214-221
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• 1999

In this research, a power-assisted steering system is modeled as a part of a full vehicle dynamic model. The dynamic model of the steering system incorporates hydraulic and dynamic relations between major parts of a steering system, such as steering column, control valve, rack and pinion gear. Through an experimental setup of the steering system, the steering system model is validated. The steering model is included in a full vehicle dynamic model of a car, where kinematic relations between steering and suspension system are defined, and various simulations are performed to evaluate the performance of steering system in conjunction with overall dynamic performance of the vehicle.

• Transactions of the Korean Society of Automotive Engineers
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• v.7 no.9
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• pp.105-111
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• 1999

The paper presents development of a Hardware-In-the-Loop simulation (HILS) system for the purpose of testing performance, stability, and reliability of an electronic power steering system(EPS). In order to realistically test an EPS by the proposed HILS apparatus, a simulated uniaxial dynamic rack force is applied physically to the EPS hardware by a pnumatic actuator. An EPS hardware is composed of steering wheel &column, a rack & pinion mechanism, andas motor-driven power steering system. A command signal for a pneumatic rack-force actuator is generated from the vehicle handling lumped parameter dynamic model 9software) that is simulated in real time by using a very fast digital signal processor. The inputs to the real-time vehicle dynamic simulation model are a constant vehicle forward speed and from wheel steering angles driven through a steering system by a driver. The output from a real-time simulation model is an electric signal that is proportional to the uniaxial rack force. The vehicle handling lumped parameter dynamic model is validated by a fully nonlinear constrained multibody vehicle dynamic model. The HILS system simulation results sow that the proposed HILS system may be used to realistically test the performance stability , and reliability of an electronic power steering system is a repeated way.

• KIPE Magazine
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• v.25 no.2
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• pp.37-42
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• 2020

• Railway Journal
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• v.12 no.3
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• pp.45-50
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• 2009

• Journal of the korean Society of Automotive Engineers
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• v.15 no.5
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• pp.8-14
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• 1993

본 고에서는 실시간 Hardware-in-the-loop 시뮬레이션의 기술 현황 및 적용 분야를 알아보고, 차량 동력학 분야에 있어서, 실시간 시뮬레이션의 구현을 위해 확보되어야 할 하드웨어 및 소프트웨어 환경에 대한 고찰과 이를 이용한 시스템 설계를 소개하고자 한다.

• KIPE Magazine
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• v.14 no.5
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• pp.36-41
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• 2009

전기철도차량에는 대용량 추진제어 컨버터/인버터부터 소용량 스위칭 모드 전원장치에 이르기까지 철도차량의 운행에 필요한 각종 동력 및 전력을 공급하기 위한 여러 가지 형태의 전력변환장치가 사용되고 있다. 그 중 가장 대표적인 전력변환장치가 추진제어인버터와 보조전원장치이다. 전기철도차량의 성능평가는 전력변환장치의 성능평가라 할 수 있을 정도로 많은 비중을 전력변환장치가 차지하고 있다. 한국철도기술연구원은 국토해양부로부터 지정받은 성능시험기관으로서 국내 도시철도 및 철도차량의 성능평가를 수행하고 있다. 성능시험은 차량의 제작공정에 따라 부품시험, 구성품시험, 완성차시험, 예비주행 및 본선시운전의 각 단계별로 실시하고 그 시험기준으로 도시철도차량의 성능시험에관한기준 및 철도차량성능시험 시행지침이 적용된다. 성능시험기준을 근간으로 추진제어인버터와 보조전원장치의 성능시험 대한 시험항목과 시험방법에 대하여 소개한다.