• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제55권1호
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• pp.1-8
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• 2006

Now a day, owing to high efficiency and easy speed control of brushless DC(BLDC) motor, the demand of BLDC motor that has high power and low noises are increasing. Especially demand of interior permanent magnet(IPM) BLOC with high efficiency and high power in electric motion vehicle is increasing. IPM BLDC motor has permanent magnets in the rotor. Because it has two different flux paths, magnetic reluctance differences are generated in d-axis and q-axis. As the result of the inductance differences that are generated by the saliency(magnetic reluctance differences) in the rotor, the motor has structure advantage that has the additional reluctance torque except a magnet torque and because magnet is situated inside the rotor, the mechanical structure is strong. Therefore IPM BLDC motor makes possible to have high speed and high power. This paper presents a design and characteristics analysis of IPM BLDC motor for electric vehicle. To design IPM BLDC motor, surface mounted permanent magnet(SPM) BLDC motor is used as the initial design model. According to the shape-ratio() of permanent magnet, the characteristic of IPM BLDC motor is analyzed by Finite element method (FEM). Characteristics analysis results of the designed motor are compared with the experimental results.

• 감성과학
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• 제16권2호
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• pp.157-166
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• 2013

자동차 인테리어에 사용된 여러 가지 재질에 대하여 현재까지 촉감을 측정하고 평가하여 소재의 적용과 표면질감의 기준을 결정하고자 했던 연구는 자동차의 조작 장치에 대한 인간공학적 평가, 시각적 디자인요소에 대한 연구에 비해서는 많지 않다. 본 연구에서는 자동차 인테리어의 여러 소재에 대한 촉감 관련 감성을 측정하고 평가하는데 사용될 수 있는 촉감 관련 대표감성을 추출하고자 하였다. 기존의 감성어휘 연구에서 추출되어 있는 대표감성어휘를 이용하여, 자동차에 탑승하여 여러 재질을 보고 만지면서 촉각으로 느껴지는 촉감에 대해 느껴지는 감성어휘와 자동차 사용기의 분석 및 자동차 전문가에 대한 인터뷰 등을 종합하여 최종적으로 52개의 촉감 관련 감성어휘를 추출하였다. 이를 요인분석한 결과 거칠기, 단단함, 마찰감, 안락감, 뻣뻣함, 부드러움, 온도감, 매끈함, 친숙함, 유연함 등 10개의 대표감성으로 분류되었다. 이러한 대표감성 어휘는 자동차 인테리어의 촉감에 대한 소비자의 감성을 측정하고 평가하는데 활용될 수 있을 것이며 금속, 플라스틱, 가죽 등 다양한 소재들의 고급감을 향상시킬 수 있는 질감을 결정할 수 있는 감성평가의 기본 자료로 활용될 수 있을 것이다.

• 한국CDE학회논문집
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• 제19권4호
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• pp.324-331
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• 2014

In the design of a combat vehicle, various performances such as firepower, mobility and survivability, etc., should be considered. Furthermore, since these performances relate to each other, design framework which can treat an integrated system should be employed to design the combat vehicle. In this paper, we use empirical interior ballistic and 3D combat vehicle analyses for predicting firepower and mobility performances which are developed in previous study (1) integrated performance modeling. In firepower performance, pitch and roll angle by sequential firing are considered. In mobility performance, vertical acceleration after passing through a bump is regarded. However, since there are many design variables such as mass of vehicle, mass of suspension, spring and damping coefficient of suspension and tire, geometric variables of vehicle, etc., for firepower and mobility performance, we utilize analysis of variance and quality function deployment to reduce the number of design variables. Finally, integrated design optimization is carried out for integrated performance such as firepower and mobility.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.694-698
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• 2006

This paper presents an optimal design process using beads on a body panel to improve interior noise of a passenger vehicle. Except modification of structural members, it is difficult to find effective countermeasures that can work for the intermediate frequency range from 100 Hz to 300 Hz which lies between the booming and low medium frequency. In this study, it is a major goal to find additional counter-measures for this intermediate frequency range by performing optimal design of beads on body panels. The proposed method for design optimization consists of 4 sub-steps, that is, a) problem definition, b) cause analysis, c) countermeasure development and d) validation. The objective function is minimization of interior noise level. The major design variables are the geometrical shape of a bead and combination of beads on the critical panels. Sensitivity analysis and optimization are performed according to the predefined process for an optimal design. It is verified that the proposed design decreases the level of noise transfer function above 5 dB.

• 서비스연구
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• 제11권3호
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• pp.43-54
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• 2021

본 연구는 자율주행시대에 적합한 차량 실내 인테리어 디자인 중에서 실내 공간, 편의장치를 중심으로 진행하였으며 STEEP 분석법을 적용하여 미래 자동차 실내디자인 모델을 제시하였다. 서비스디자인 방법론을 적용하여 레이아웃의 재배치와 운전자 중심의 정보 제공 목적으로 설치되었던 디스플레이 장치의 변화를 다루고 있다. 커넥티드, 인포테인먼트 등 다양한 목적을 위한 디스플레이의 종류와 설치 위치에 대한 변화가 예상된다. 특히, 이런 분석을 통해 미래 자율주행 자동차에서 지내게 되는 실내 인테리어 연구를 통한 트렌드와 경험을 연구함으로서 이후 후속연구에서는 실제 개발과 응용을 위한 기초 자료로써 활용될 것이다. 5단계로 진행한 연구 과제를 STEEP과 연계하는 미래트렌드 도출과 FGI를 통한 전문가들의 자문을 거쳐 핵심동인을 추출 하였다. 이를 통해 이후 실내디자인에 하나의 방향으로 제시했다. 사용자 중심의 참여형 디자인 방법을 통해 자율주행차에서 기대 할 수 있는 체험과 경험을 위주로 감성적인 키워드 도출법을 사용하였다, 도출된 동인을 미래사회 5대 트렌드와 묶어서 요약정리 하였고 각 도출된 동인들에는 해당되는 기술 분야를 함께 고려할 수 있도록 그룹핑을 했으며, 자율주행 Level에 따라 수요자가 경험할 수 있는 요소를 더하기도 했다. 이는 미래 자율주행차 산업은 개인적 성향뿐만 아니라 다양한 사회적 이슈와 관점에서 바라본 실내 레이아웃, 편의장치 등의 서비스디자인 트렌드에 대한 연구가 이어져서 보다 다양한 연구가 진행되어야 할 것이다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계 학술대회논문집(수송기계편)
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• pp.134-139
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• 2005

This paper presents a robust design of vehicle interior noise using Taguchi method and a substructure synthesis method with a hybrid model. Firstly, the proposed method identifies the critical process of the concerned interior noise through a TPA (Transfer Path Analysis). Secondly, a strategy for a robust design is discussed, in which the major noise factor among uncertainties in the process is quality distribution of rubber bushes connecting a cradle and a trimmed body. Thirdly, a virtual test model fer the process is developed by applying a substructure synthesis method with a hybrid modeling approach. Fourthly, virtual tests are carried out according to the predefined tables of orthogonal array in Taguchi robust design process. The process was performed under 2 sub-steps. The first step is sensitivity analysis of 31 panels, and the other step is weight optimization of mass dampers on sensitive panels. Finally, two vehicles with the proposed countermeasures were validated. The proposed method reduces 87.5% of trials of measurements due to the orthogonal arrays and increases robustness by 8.6dB of S/N ratio and decreases $5\;dB(A){\sim}10\;dB(A)$ of interior noise in the concerned range of RPM.

• 전기학회논문지
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• 제65권5호
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• pp.777-784
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• 2016

In this paper, the performance design and analysis for an Interior Permanent-Magnet Synchronous Motor (IPMSM) that will be used as a traction motor in the e-4WD system of hybrid SUV(Sports Utility Vehicle) and RV(Recreational Vehicle), are investigated using finite element method. In order to improve the accuracy of design, the tolerances of parts and assemblies as well as the material properties of permanent magnet, stator, rotor and winding etc. are considered under the conditions similar to real driving state of motor. Both no load performance test and maximum load performance test, in which real driving state and cooling condition have been considered, are also implemented via proto sample build to verify the validity of motor's performance design.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1776-1781
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• 2008

To reduce interior noise of running vehicles, a floating floor construction has been widely used in recent railway industry. Among the key factors of the floating floor design, dynamic stiffness is of most important in acoustical point of view. Sometimes hard rubber type supports have often been selected due to the other design constraints such as heavy load condition, durability of rubber element and its cost etc., even though it seems like the softer support, the better isolation of noise and vibration. In this paper two representative floor supports have been considered to evaluate their effectiveness in interior noise contribution: one is a soft rubber and another is a relatively hard one. From the measured dynamic stiffness of the specimens, equivalent stiffness of actual floating floor has been derived to use in the analytical models. Calculated air-borne and structure-borne noise insulation properties of the floating floors have been compared with experiments in prototype car. In full car model interior noise levels of running vehicles have been predicted to quantify the effectiveness of the two different floating support materials and verified through the measured inside noise levels of actual train as well. By comparison with difference of running noise levels two materials for floor support can be investigated quantitatively so that it could be applied in floating floor design.

• 전기학회논문지
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• 제62권10호
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• pp.1475-1480
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• 2013

In this paper, the basic design study of a water-cooling jacket, which have reported no cases for applying to railway traction motors so far, were conducted for applying to Interior Permanent Magnet Synchronous Motor (IPMSM) for railway vehicles. The basic thermal characteristics analysis of the 110kW-class IPMSM was performed by using 3-dimentional thermal equivalent network method. The necessary design requirements of the water-cooling jacket were derived by analyzing the results of the basic thermal properties. Next, the thermal characteristics analysis technique was established by using the equivalent model of the solenoid-typed pipe to be installed on the inside of the water-cooling jacket for 110kW-class IPMSM. Finally, a design model of 6kW-class water-cooling jacket was derived through the analysis of various design parameters.

• 한국전자통신학회논문지
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• 제16권5호
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• pp.845-850
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• 2021

본 연구에서는 전기 자동차(EV : Electric Vehicle) 파워트레인의 에너지 변환 특성과 설계를 수행하였다. 그리고 EV 파워트레인의 동력원으로서 영구자석 매입형 동기 모터(IPMSM : Interior Permanent Magnet Synchronous Motor)를 대상으로 하였으며 제어를 수행하였다. IPMSM을 구동하기 위해서는 두 가지 영역인 일정한 토크와 일정한 출력(약계자) 영역이 사용되며, IPMSM을 위한 제어 시스템의 설계는 d-q 레퍼런스 프레임(벡터 제어)을 바탕으로 구성하였다. IPMSM의 두 영역에서 나타나는 모터 토크의 정적 특성을 결정하기 위해 IPMSM의 토크제어 시스템과 d축 전류 제어 시스템을 제안 및 구현하였다. 특성해석을 위해서 Matlab-Simulink 소프트웨어를 사용하였다. 최종적으로 실제 차량 사양을 기준으로 EV 차량 레벨 조건으로 변경하여 파워트레인 모델에 IPMSM을 적용하였으며 제안된 제어 시스템의 시뮬레이션 결과를 수행했고 특성을 분석하였다.