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S. A. CHEN,X. LI,L. J. ZHAO,Y. X. WANG,김영배 한국자동차공학회 2015 International journal of automotive technology Vol.16 No.5
A system of electromagnetic semi-active suspension reclaiming energy (ESASRE), with an novel control varying charge voltage in steps (CVCVIS) based optimal integrated controller, is newly proposed to improve ride comfort and energy reclaiming. The proposed CVCVIS is built by changing the number of battery packs. The dynamic model of the semiactive suspension reclaiming energy is established first, which fully accounts for the non-linear characteristics of the damping actuator reclaiming energy (DARE). The parameters of DARE are decided by a compromise between ride comfort and manufacturing cost, with consideration of installation convenience. A integrated control system for ESASRE includes a controller for calculating the real-time ideal control force based on optimal linear quadratic Gaussian (LQG) control and the other for calculating the number of charging batteries to obtain the real-time actual control force using the proposed quasilinear relation function. Performance comparisons are implemented using three suspension types: ESASRE, the passive suspension, and the ideal active suspension. The performance index of ESASRE is 19.8% lower than that of the passive suspension, and 3.82% higher than that of the active suspension. With ESASRE, the power flowing into the battery pack accounts for 77.72% of the total vibration energy absorbed by DARE.
Influence of Semi-active Suspension on Running Safety of Vehicles
Liu, Hong-You,Yu, Da-Lian The Korean Society for Railway 2010 International Journal of Railway Vol.3 No.2
Railway vehicles equipped with semi-active suspension system can improve the ride quality of car bodies. Semi-active suspension system is usually applied onto high speed train, and therefore higher running safety requirement is desirable. The influence of semi-active suspension system on safety of vehicles running on straight line and curve line is studied, and the influences of sky hook damping coefficient and system time-delay on operational safety of cars fitted with semiactive suspension system is analyzed. The results show that in vehicles equipped with semi-active suspension system, while the vibration of car body is decreased, the running safety of cars is not affected to any significant degree. As a result, the ride quality is much improved with negligible deterioration of the running safety of cars.
Roller Rig Tests of a Semi-Active Suspension System for a Railway Vehicle
Nam-Jin Lee,Chul-Goo Kang,Won-Sang Lee,T. Dongen 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Traditional suspension system of a railway vehicle has usually a constant characteristic for all running conditions, and in general it cannot meet continuously rising requirements concerning ride comfort, running safety, and high speed. In this paper, we present a semi-active suspension system for a railway vehicle to improve a ride comfort under various running conditions. Hardware and software of the semi-active suspension system are realized, and the improvement of ride quality performance is confirmed through roller rig tests.
SimulationX 기반 자동차 semi-active 현가장치의 모델 개발 및 특성 해석
정인태(I. T. Jeong),정동석(D. S. Jeong),정원식(W. S. Jeong),이성민(S. M. Lee),유보연(B. Y. Yoo),장대범(D. B. Jang),서영우(Y. W. Seo),한성민(S. M. Han),이석우(S. W. Lee),여현승(H. S. Yeo),류하오(Hao Liu) 유공압건설기계학회 2022 유공압건설기계학회 학술대회논문집 Vol.2022 No.12
The semi-active suspension system controls the damping force of the vehicle damper to simultaneously improve the steering stability (handling) and ride comfort of the vehicle. In order to improve the ride comfort of a passenger car, performance analysis is required through modeling and simulation adaptation of a semi-active suspension system. This study used SimulationX, a commercial multi-domain analysis S/W, and modeling about 1/4 car of the semi-active suspension system. The damping force was controlled through a given performance of the damper. The developed SimulationX-based semi-active suspension system model is prepared for future controller development research.
Chenguang Yang,Xiaolong Yang,Youming Zhou 한국자기학회 2023 Journal of Magnetics Vol.28 No.3
At present, most of the seat suspensions of heavy-duty trucks use passive suspension and active suspension. The passive suspension has gradually failed to meet people's needs in terms of vibration reduction performance, and the active suspension will consume too much energy. In this paper, a stepped by-pass valve magnetorheological semi-active suspension based on fuzzy PID control is proposed. The Simulink is used to simulate the system. In the case of sinusoidal excitation, the results show that this semi-active suspension reduces the vertical acceleration by 44.36%, the dynamic deflection of the suspension by 29.63% and the dynamic deformation of the tire by 43.78% compared with the passive suspension. Under the condition of C-level road surface input, the vertical acceleration of the suspension is reduced by 35.14%, the dynamic deflection of the suspension is reduced by 31.93%, and the dynamic deformation of the tire is reduced by 27.65%.
감쇠력 가변댐퍼를 이용한 반능동 현가장치의 실차실험 특성에 관한 연구
이광헌(K. H. Lee),이춘태(C. T. Lee),정헌술(H. S. Jeong) 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.4
A semi-active suspension is an automotive technology that controls the vertical movement of the vehicle while the car is driving. The system therefore virtually eliminates body roll and pitch variation in many driving situations including cornering, accelerating, and braking. This technology allows car manufacturers to achieve a higher degree of both ride quality and car handling by keeping the tires perpendicular to the road in corners, allowing for much higher levels of grip and control. An onboard computer detects body movement from sensors located throughout the vehicle and, using data calculated by opportune control techniques, controls the action of the suspension. Semi-active systems can change the viscous damping coefficient of the shock absorber, and do not add energy to the suspension system. Though limited in their intervention (for example, the control force can never have different direction than that of the current speed of the suspension), semi-active suspensions are less expensive to design and consume far less energy. In recent time, the research in semi-active suspensions has continued to advance with respect to their capabilities, narrowing the gap between semi-active and fully active suspension systems. In this paper we are studied the characteristics of vehicle movement during the field test with conventional and semi-active suspension system.
( Jung-hwan Lee ),( Hak-jin Kim ),( Bong-jin Cho ),( Jin-ha Choi ),( Young-jookim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Research on various suspension systems for agricultural tractor has been carried out for decades. Front axle suspension plays a major role in both increasing the traction force of the tractor and reducing the front vibration of the tractor. In our previous study, a test-rig consisting of a hydraulic-pneumatic front axle suspension system was built to investigate the effect of damping force and flow rate used in the suspension system on the attenuation of the vibration resulting from varying road conditions. This paper reports on the development of a method to identify the bumped road surface using an optical sensor(LiDAR) in advance to control the damping characteristics of the hydraulic front axle suspension system in a more efficient manner. The optical sensor was mounted at the front of the tractor with its angle tilted toward the ground. The roughness of the road surface was quantified by calculating the difference of distance average between each sample. Experimental tests were conducted under two different road conditions (even and bumped roads). The results of bump detection processing methods used in the study showed that the level of roughness and the presence of bump were detectable in a typical range of travelling speeds of tractors when setting the suitable threshold value for the difference of average distance obtained in region of interest (ROI). It was found that the developed road roughness detection system could be used as a look-ahead method to predict a change in the ground condition due to the ability to characterize the ground surface, which could be employed in a semi-active control system that can vary the damping characteristics of the front axle suspension according to varying road conditions. As a result of the control performance experiments using the bump detection system, the vertical acceleration of the vehicle body was reduced when passing the bump, and the steering performance was improved by reducing the axle movement when traveling on even roads, which means that the trade-off problem in passive system is improved in terms of suspension performance.
L. BALAMURUGAN,J. JANCIRANI,M. A. ELTANTAWIE 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.3
In this paper, analytical characterization of the magneto-rheological (MR) damper is done using a new modifiedalgebraic model. Algebraic model is also more preferable because of its low computational expenses compared to differentialBouc-Wen’s model which is highly computationally demanding. This model along with the obtained model parameters is usedas a semi-active suspension device in a quarter car model and the stationary response of the vehicle traversing on a rough roadis obtained. The control part consists of two nested controllers. One of them is the system controller which generates thedesired damping force and the other is the damper controller which adjusts the voltage level to MR damper so as to track thedesired damping force. For the system controller a model reference skyhook Sliding Mode Controller (SMC) is used and forthe damper controller a continuous state algorithm is built to determine the input voltage so as to gain the desired dampingforce. The analytical model is subsequently used in the quarter car vehicle model and the vehicular responses are studied. Asimulation study is performed to prove the effectiveness and robustness of the semi-active control approach. Results show thatthe semi-active controller can achieve compatible performance as that of active suspension controller except for a littledeterioration.