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노면 조건에 따른 차량용 회생 댐퍼 에너지 회수율 연구
박규식(Kyushik Park),김정래(Jeongrae Kim),김광일(Kwangil Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Road vehicles normally expend a significant amount of energy in undesirable vertical motions which are induced by various road bumps, handling and breaking, and much of the kinetic energy is dissipated into air through shock absorbers by means of heat energy. Recently, several studies are made regarding energy-regenerative shock absorbers which can recover the kinetic energy of the vehicle into electrical energy instead of heat. Presented in this paper include energy recovery potential of regenerative shock absorbers of the passenger cars on various road conditions including city, highway, country and rough road and some critical requirement and possible system configurations which must be taken into consideration for better ride and handling performance.
캘리퍼 일체형 전자식 주차 브레이크의 방사소음 해석을 통한 작동소음 저감에 관한 연구
이정환(Junghwan Lee),김승중(Seungjoong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park),한민규(Mingyu Han) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The purpose of this study is to minimize operating noise of Motor-on-Caliper (MoC) type Electronic Parking Brake (EPB) system. The acoustic radiation analysis model is developed based on the finite element method. This model is applied to derive an internal force from surface vibration by using an inverse load identification method and to predict the radiation noise by using a boundary element method. According to the experiments, gear meshing frequency for reduction gear is a main source of radiated noise. But, it is very difficult to find a reduction gear combination which can meets a low noise radiation and mechanical performance at the same time. Therefore, we focused on the exterior design to cut operating noise down by CAE technology. To verify the results from acoustic radiation analysis, an experiment was conducted under the same condition as numerical simulation, and their results were compared.
Brake by Wire System용 Front Electro Mechanical Brake 개발
박승영(Seungyoung Park),박규식(Kyushik Park),김명준(Myoungjune Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Brake by Wire system is different from conventional hydraulic brake system that is consist of caliper, pipe, and hydraulic pumps. Electro Mechanical Brake is used for braking component for BBW. BBW includes EMB determines driver’s demand for braking through electric sensors on brake pedal and makes optimum braking torque by current control of EMB. It is essential technology for hybrid and electric vehicle to reduce fuel consumption and to improve vehicle safety. MANDO already tested vehicles equipped Hybrid Brake System has conventional hydraulic calipers for front wheel for safety from electric fails and EMB for rear wheel. We identified rear EMB performance for braking and some functions for vehicle safety. But BBW is more effectively to improve driving safety and fuel consumption than HBS. And it is important to make a front wheel EMB for EV, HEV and green vehicle. This study designed EMB for front wheel using experiences and experimental data of rear wheel EMB and made proto samples for vehicle test and confirmed basic performance.
김정래(Jeongrae Kim),박규식(Kyushik Park),김광일(Kwangil Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
An electro-mechanical actuator is increasingly applied for the active roll control system to improve fuel efficiency and to simplify system configurations. The electric active roll control system (eABC System) has an advantage of rapid response, but it needs gear box with high reduction ratio to generate high torque for vehicle roll attitude control. This reduction gear amplifies the effect of friction and rotating inertia when the actuator rotates, and it influences negative effect on riding performance. The paper introduces some arrangements of motor and gears of the actuator for eARC system, and proposes the optimized actuator structure to improve ride feeling by estimating dynamic characteristics of each arrangement through simulating the dynamic model of the system.
안희락(Heerak Ahn),장인규(Ingyu Jang),박규식(Kyushik Park) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Environmental concerns, fuel efficiency regulation as emission standards make driving with alternative fuel Vehicle harder and harder, and they bring a big competition in the Hybrid Electrical Vehicles (HEVs) market. Currently, 48 V Belt driven Starter Generator (BSG) system attracts the notice of the HEVs market with its improvement of fuel efficiency for cost and minimization of system change.1) To maximize the efficiency of the HEV system, the battery system has great meaning on the efficiency of the HEV system, since it comprises a large proportion of cost and weight of the system. Therefore designing efficient battery system can be directly considered as enhanced system efficiency. This research aims to compose battery systems of the BSG system for each vehicle segment, including capacity, power, energy, volume, price and rough lifetime.
컬럼 장착형 전자식 조향 장치의 모터 열-유동 특성에 관한 연구
김승중(SeungJoong Kim),이정환(Junghwan Lee),김일용(Ilyong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this paper, flow and heat transfer characteristics of an brushless DC motor which is installed CMDPS(Column type Motor Driven Power Steering) are numerically analyzed three/two dimensional electromagnetic model and three-dimensional turbulence modeling. CMDPS is based on conventional steering system and it assist steering torque by motor, worm & worm wheel gear set. CDMPS motor is be heated by coil, stator core, magnet and rotor core because it is always operation and set on various situation in driving time. For the present study, parking situation is considered for boundary conditions (row RPM, high torque and natural convection at motor outside) because it is most severe heat conditions for motor. Heat loss of each parts is calculated by Maxwell and temperature characteristics are calculated Ansys and Star-CCM+.
해석기법을 이용한 매입형 영구자석 동기 모터의 특성평가에 관한 연구
이정환(Junghwan Lee),김승중(Seungjoong Kim),김일용(Ilyong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
As enforced the regulation of fuel efficiency and increased the demand of green car, many interest are focused on electric vehicle and hybrid electric vehicle. Therefore, it is well known that the Interior Permanent Magnet Synchronous Motor (IPMSM) plays an important role in electric direct-drive in-wheel traction system. This study describes the simulation method to predict the mechanical characteristics which is coupled with an electro-magnetic field of IPMSM. The simulation was performed in two steps based on the finite element analysis. In the first step, electro-magnetic forces and losses versus rotation angle of rotor were calculated using 2D electro-magnetic field analysis with the current inputs given from experiments. In the second step, the resultant forces and losses were applied to the rotor and stator in order to calculate mechanical characteristics (stress, temperature distribution, etc) at the operational condition of interest using transient analysis. To verify the results from analysis, an experiment was conducted under the same condition as numerical simulation, and their results were compared.
아우터 타이 로드 경량화를 위한 근사 모델 기반 최적 설계
진성완(Sungwan Jin),고수곤(Soogon Koh),신인섭(Inseob Shin),김용갑(Yong Kap Kim),박규식(Kyushik Park) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
Recently in the various industries including automotive department are using CAE (computer aided engineering) method to reduce the development costs such as time and material cost. In this paper, we simplified the outer tie rod from finite element (FE) model to beam element model, approximation model. And we formulated a design problem to minimize the weight of outer tie rod while satisfying the design constraints, buckling load. Design optimization results reveals that the weight is reduced by 10.3% using evolutionary algorithm.