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Simulation Research of Air Suspension Characteristics Base on Fuzzy Controller
H. Liu(류하오),J. C. Lee(이재천) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11
The research aim of the paper is to investigate air suspension characteristics. The mathematical model of the air suspension is established at first. An then, the semi-active hybrid control air suspension is developed by using fuzzy control algorithm. According to the vehicle body acceleration, this fuzzy controller adjusts the orifice opening area so as to change the air spring stiffness in certain range. At the same time, the suspension damping is controlled, depending on suspension motion state. The simulation results indicate that the semi-active hybrid control air suspension can achieve the best ride comfort quality, without losing road holding ability and increasing suspension working space.
Fuzzy Controller Design for a Automotive Air Suspension
H. Liu(류하오),J. C. Lee(이재천) 유공압건설기계학회 2012 드라이브·컨트롤 Vol.9 No.2
본 연구의 목적은 에어 서스펜션 시스템의 제어 특성을 분석하는 것이다. 우선 에어 서스펜션 시스템의 수학적 모델을 구하였다. 그리고 퍼지 제어 알고리즘을 적용하여 반능동식 하이브리드 제어 에어 서스펜션을 구하였다. 차체 가속도에 따라 퍼지 제어기는 오리피스 개도를 변경하여 특정 영역에서 에어 스프링의 강도를 조정한다. 동시에 서스펜션 운동 상태에 따라 서스펜션 댐핑이 제어된다. 시뮬레이션 결과는 반능동식 하이브리드 제어 에어 서스펜션이 노면 접지능력의 상실이나 서스펜션 작동 공간의 증가 없이 최고의 승차감을 제공할 수 있음을 보여준다.
Simulation Analysis of Active Roll Stabilizer for Automotives Based on AMESim
류하오(H. Liu),이재천(J. C. Lee),여인철(Y. C. Yo) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.6
In order to provide theoretical analysis for the active roll stabilizer (ARS), the simulation model based on AMESim is developed in the paper. The simplified vehicle rolling motion model is derived firstly, and then the entire ARS control system model is constructed. Furthermore, the simulation is implemented to confirm the roll control effect. The simulation results show that the derived model can be used as theoretical analysis for developing components of ARS control system.
류하오(Hao Liu),이재천(J. C. Lee),조종환(J. H. Cho),허만대(M. D. Hur) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
Due to high efficiency and easy control convenience of dual clutch transmission (DCT), nowadays DCT is increasingly applied on passenger vehicles. As a main component of DCT, dry dual clutch (DDC) should smoothly transmit power to the odd or even gear set. Frequent engagement and disengagement lead temperature increasing of the contact facing of the DDC. Too high temperature would speed up degradation or serious wear of the pressure plate and burning of the disk. It is significant to know the thermal model of the DDC during the period of development and design. By analyzing each component of the DDC, a lumped thermal model is proposed in the paper. Base the thermal model, simulation by using simulink is performed according to the experimental condition. The simulation results show consistency with the experiment, which validates the proposed thermal model of the DDC.
김현모(H. M. Kim),류하오(Hao Liu),이재천(J. C. Lee) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.9
In this paper, in the experiment environment of electrohydraulic non-linear valve servo systems, to design a controller using indirect model reference adaptive control(IMRAC). Designed controller performance was verified by experiment.
A Study on Thermal Analytical Model for a Dry Dual Clutch
Hao Liu(류하오),J. C. Lee(이재천),Y. J. Noh(노유정),J. H. Cho(조종환),H. R. Lee(이희락),J. E. Koh(고재욱),J. W. Kang(강지우) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.1
The stability of friction characteristics and thermal management for a dry type dual clutch transmission (DCT) are inferior to those of a wet clutch. Too high temperature resulting from frequent engagement of DCT speeds up degradation or serious wear of the pressure plate or burning of the clutch disk lining. Even though it is significantly important to estimate the temperature of a dry double clutch (DDC) in real-time, few meaningful study of the thermal model of DDC has been known yet. This study presented a thermal analytical model of lumped parameters for a DDC by analyzing its each component firstly. Then a series of experimental test was carried out on the test bench with a patented temperature telemetry system to validate the proposed thermal model. The thermal model, whose optimal parameter values were found by optimization algorithm, was also simulated on the experimental test conditions. The simulation results of DDC temperature show consistency with the experiment, which validates the proposed thermal model of DDC.
이재천(J. C. Lee),류하오(H. Liu) 유공압건설기계학회 2011 드라이브·컨트롤 Vol.8 No.2
The analysis of an air spring characteristics is necessary to design and control automotive air suspension system properly. A mathematical model of an air spring was derived in light of energy conservation first. Then static and dynamic experiments of the air spring have been fulfilled. The static stiffness with various initial pressures and effective areas were obtained from the static experimental results. Theoretical static stiffness obtained by using the mathematical model and effective area data is in close accordance with the experimental estimation. The dynamic experimental results show that the hysteresis in displacement-force cycle decreases when the frequency of the harmonic displacement excitation signal increases, but it does not change too much as the frequency is higher than 1Hz. And the dynamic stiffness goes up with increasing of the initial pressure and the excitation frequency.