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On-Center Handling 해석을 위한 비선형 조향시스템 및 차량 모델의 개발
박진국(Jinkuk Park),김상섭(Sangsup Kim),정홍규(Hongkyu Jung),박준홍(Joonhong Park),이준모(Joonmo Lee) 한국자동차공학회 2003 한국자동차공학회 Symposium Vol.2003 No.9
This paper presents a modeling method to predict on-center behavior of vehicle using computer simulation, Functional suspension model was used to derive full vehicle dynamic model for efficient simulation, The functional suspension model is able to model the kinematic and compliance characteristics more accurately than existent lumped parameter vehicle dynamics models. A nonlinear steering system model was developed for rack-and-pinion steering system. Included in the model are friction. stiffness and damping characteristics of steering system and nonlinear boost curve shape. The simulation results of on-center handling for the full vehicle model with the steering system shows a good correlation with the test results. This demonstrates the validity of the vehicle and steering models and the effectiveness of the modeling method to predict the on-center handling characteristics of the vehicle
AE32000 호환 32 - 비트 EISC 마이크로프로세서 설계
곽기영(Kiyoung Kwak),박진국(Jinkuk Park),이두영(Dooyoung Yi),이범근(Beomgeun Lee),정연모(Yunmo Chung) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅰ
본 논문은 16-비트 고정된 명령어 형식을 갖는 32-비트 EISC(Extendable Instruction Set Computer) 코어 구현에 대하여 기술하였다. EISC구조는 코드 밀도가 높은 확장 오퍼랜드(operand) 형식을 사용하여 메모리 크기를 줄일 수 있으므로 ASIC 구현시 저전력 시스템 및 소형화된 임베디드 시스템을 위한 프로세서 구현을 가능하게 한다. 설계된 프로세서는 AE32000 명령어 셋과 호환이 가능하도록 설계되었으며 5단 파이프라인을 적용하여 프로세서의 성능을 높였다. 또한 BTB(Branch Target Buffer)를 사용하여 분기 지연을 줄여 낮은 CPI(Clock Per Instruction)을 유지하게 하였다.
랜덤진동하중에 노출된 Bracket의 등가하중 추정에 관한 고찰
추정환(Jeonghwan Choo),기상렬(Sangyoul Ki),박진국(Jinkuk Park),김태경(Taekyung Kim),윤광수(Kwangsoo Yoon) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
To predict the fatigue life of SPAS ECU bracket exposed to random vibration loads, the equivalent load deriving methods were investigated. The dynamic behavior of a system exposed to a random load, such as the approach in the response spectrum analysis, can be expressed as the maximum acceleration response of single degree of freedom systems. When the first eigen-mode is dominant, it is possible to apply a static load to the bracket assuming that the equivalent acceleration is the representative response of the system. The expected fatigue life derived from the static analysis result and the stress-life relation. Modal parameters, strain and acceleration data obtained from the tests are utilized for the verification of the FE model. Also, the appropriate sigma level was derived from comparing the actual failure load with the RMS response of the analytical model. It is expected that the method reviewed in this paper will contribute to the quick decision making in the initial shape design state where local shape change frequently occurs.
BLDC 모터 및 유압식 브레이커 기반의 하이브리드 동력의지 개발
이희태(Huitae Lee),조현석(Hyunseok Cho),김종권(jongkwon Kim),박진국(Jinkuk Park),장윤희(Yoonhee Chang),강정선(Jungsun Kang),최종문(Jongmoon Choi),박세훈(Sehoon Park) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.10
The purpose of this study was to develop a hybrid-powered prosthetic knee and ankle (power leg) using the brushless DC (BLDC) modules and hydraulic breakers of stance and swing phase control. The system comprised BLDC motors for the swing phase control unit and hydraulic cylinders for the stance phase control unit. An individual could walk using a low-power battery for a longer time than with a fully active or powered prosthetic leg. Moreover, the individual could walk by applying less kicking force. More stable lateral symmetry was exhibited than a prosthesis of stance phase control type. The gait algorithm is classified into five gait events using the inertial and load sensors: heel contact, heel rise, toe-off, swing flexion, and swing extension. We controlled the hydraulic breaker’s resistance force at each gait event and generated gait motion using the BLDC motors. The reliability of the system was evaluated by a transfemoral amputee subject. By comparing the gait character between the power leg and the stance phase control type prosthesis, we confirmed that the power leg improved the center of pressure (COP) of the lateral symmetry by about 71% from the center.