• Journal of international Conference on Electrical Machines and Systems
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• 제2권2호
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• pp.232-238
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• 2013

The vehicle system is a multi-domain system that requires many branches of science and engineering. Therefore the development of the vehicle system requires the use of design methodologies that utilize simulations, which have grown increasingly sophisticated in recent years. Our research group proposed a simulation modeling method based on the VHDL-AMS language. This paper describes how VHDL-AMS is used to model of vehicle fuel consumption simulation. The fuel consumption is shown using proposed simulation model on the Japanese 10-15 mode. We examine the influence of the vehicle system with electrical load and hill climb resistance in the vehicle running resistance.

• Journal of Electrical Engineering and Technology
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• 제12권1호
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• pp.91-99
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• 2017

In order to meet the thermal performance analysis accuracy requirements of high density permanent magnet synchronous motor (PMSM), a method of multi physical domain coupling thermal analysis based on control circuit, electromagnetic and thermal is presented. The circuit, electromagnetic, fluid, temperature and other physical domain are integrated and the temperature rise calculation method that considers the harmonic loss on the frequency conversion control as well as the loss non-uniformly distributed and directly mapped to the temperature field is closer to the actual situation. The key is to obtain the motor parameters, the realization of the vector control circuit and the accurate calculation and mapping of the loss. Taking a 48 slots 8 poles high density PMSM as an example, the temperature rise distribution of the key components is simulated, and the experimental platform is built. The temperature of the key components of the prototype machine is tested, which is in agreement with the simulation results. The validity and accuracy of the multi physical domain coupling thermal analysis method are verified.

• Journal of Power Electronics
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• 제11권4호
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• pp.439-448
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• 2011

In this work the Multi-Domain model of an electric vehicle is developed. The electric domain model consists on the traction drive and allows including faults associated with stator winding. The thermal model is based on a spatial discretization. It receives the power dissipated in the electric domain, it interacts with the environment and provides the temperature distribution in the induction motor. The mechanical model is a half vehicle model. Given that all models are obtained using the same approach (Bond Graph) their integration becomes straightforward. This complete model allows simulating the whole system dynamics and the analysis of electrical/mechanical/thermal interaction. First, experimental results are aimed to validate the proposed model. Then, simulation results illustrate the interaction between the different domains and highlight the capability of including faults.

• 한국전산유체공학회지
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• 제2권1호
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• pp.21-28
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• 1997

This paper presents a two-dimensional horizontal implicit model to general circulation in estuaries and coastal seas. The model is developed in non-orthogonal curvilinear coordinates system, using the Interpolating Matrix Method (IMM), in combination with a technique of multi-domain. In the propose model, the Saint-Venant equations are solved by a splitting-up technique, in the successive steps; convection, diffusion and wave propagation. The ability of the proposed model to deal with full scale nature is illustrated by the interpretation of a dye-tracing experiment in the Gironde estuary.

• 드라이브 ㆍ 컨트롤
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• 제9권1호
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• pp.56-69
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• 2012

• Structural Engineering and Mechanics
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• 제25권3호
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• pp.347-363
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• 2007

A novel methodology, referred to as Auxiliary Domain Method (ADM), allowing for a very efficient solution of nonlinear reliability problems is presented. The target nonlinear failure domain is first populated by samples generated with the help of a Markov Chain. Based on these samples an auxiliary failure domain (AFD), corresponding to an auxiliary reliability problem, is introduced. The criteria for selecting the AFD are discussed. The emphasis in this paper is on the selection of the auxiliary linear failure domain in the case where the original nonlinear reliability problem involves multiple objectives rather than a single objective. Each reliability objective is assumed to correspond to a particular response quantity not exceeding a corresponding threshold. Once the AFD has been specified the method proceeds with a modified subset simulation procedure where the first step involves the direct simulation of samples in the AFD, rather than standard Monte Carlo simulation as required in standard subset simulation. While the method is applicable to general nonlinear reliability problems herein the focus is on the calculation of the probability of failure of nonlinear dynamical systems subjected to Gaussian random excitations. The method is demonstrated through such a numerical example involving two reliability objectives and a very large number of random variables. It is found that ADM is very efficient and offers drastic improvements over standard subset simulation, especially when one deals with low probability failure events.

• Journal of applied mathematics & informatics
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• 제26권3_4호
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• pp.519-530
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• 2008

This paper studies the multi-domain coupled system of one dimensional Arctic temperature field and establishes identification model about the thermodynamic parameters of sea ice (heat storage capacity, density and conductivity) by the so-called output least-square estimate according to the temperature data acquired by a monitor buoy installed in the Arctic ocean. By the optimal control theory, the existence and dependability of weak solution and the identifiability of identification model have been given. Moreover, necessary optimality condition is proposed. Furthermore, the optimal algorithm for the identification model is constructed. By using the optimal thermodynamic parameters of Arctic sea ice, the numerical simulation is implemented, and the numerical results of temperature distribution of Arctic sea ice are demonstrated.

• 한국산학기술학회논문지
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• 제13권3호
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• pp.1008-1013
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• 2012

EHPS는 탈엔진형 조향기술로 BLDC 모터를 통해 유압펌프를 작동시켜 조향력을 보조하는 동력 조향장치이다. EHPS는 BLDC 모터, 기어펌프 및 유압회로, 파워 스티어링 등으로 이루어진 전기전자, 유압 및 기계시스템의 복합적 시스템으로 모델링이 어렵다. 본 논문에서는 EHPS 시스템의 구성 부품을 수학적 모델링 하였고, AMESim을 이용하여 multi-domain 시스템의 시뮬레이션 모델을 구축하였다. 이를 활용한 다양한 시뮬레이션을 통해 개발 초기단계에서의 시행착오를 줄이고 완성도 높은 EHPS 개발 업무를 수행하는 데 도움을 줄 수 있을 것으로 사료된다.

• 한국ITS학회 논문지
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• 제7권1호
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• pp.84-91
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• 2008

본 논문은 다중경로 채널에 따른 채널왜곡을 보상하여 복조하는 주파수 영역 기반 BPM-UWB수신기를 제안한다. 시간영역 BPM-UWB수신기로부터 주파수 영역 기반 BPM-UWB 수신 방식을 유도하였으며 다중경로 채널 환경에서도 성능을 최적화 시킬 수 있는 matched 필터 방식 수신기 구조를 제시하였다. 수학적인 분석에 의해서 시스템 성능을 유도하였으며 시뮬레이션에 의해서 제안한 채널 보상 시스템에 의해 성능이 획기적으로 개선됨을 보인다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2009년도 춘계학술대회 논문집
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• pp.289-292
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• 2009

다중 스월 환형 연소기의 난류 유동장을 Large Eddy Simulation(LES)와 병렬 계산 기법을 사용하여 모사하였다. 해석에 이용된 연소기 모델은 GEAE 의 LM6000 연소기이다. 연소기 내에서 와류의 생성과 소멸은 단일 인젝터 해석결과와 유사하나, 인젝터간 상호 인접구간에서의 와류의 충돌은 인젝터간 와류 강도가 다르며, 이로 인하여 복잡하고 강한 압력파가 연소실 내에 전파됨을 확인하였다. 특히 다중 스월인젝터를 모사하므로서 횡방향의 압력 진동이 수치적으로 포획되었다.