MR 유체와 댐퍼 형상 및 물성을 고려한 MR 댐퍼 감쇠력 예측 프로그램

김용진,정준영,박종덕,강경호,이치범 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.12

Magneto-Rheological(MR) fluid-based dampers provide different damping forces, depending on the magnetic field generated by an electromagnet. This study aims to develop a damping force prediction program for MR dampers by modelling the properties of MR fluids and the magnetic properties of MR damper designs. Through the characterization and analysis of MR fluid properties, this study aims to establish a framework to understand the behavior of MR dampers and their impact on vehicle dynamics. Then, the developed program can be used to predict the damping force at the design stage, enabling efficient design and optimization of MR dampers in automotive applications.

State-of-the-art of semiactive control systems using MR fluid dampers in civil engineering applications

Jung, H.J.,Spencer, B.F. Jr.,Ni, Y.Q.,Lee, I.W. Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.17 No.3

Semiactive control systems have received considerable attention for protecting structures against natural hazards such as strong earthquakes and high winds, because they not only offer the reliability of passive control systems but also maintain the versatility and adaptability of fully active control systems. Among the many semiactive control devices, magnetorheological (MR) fluid dampers comprise one particularly promising class. In the field of civil engineering, much research and development on MR fluid damper-based control systems has been conducted since this unique semiactive device was first introduced to civil engineering applications in mid 1990s. In 2001, MR fluid dampers were applied to the full-scale in-service civil engineering structures for the first time. This state-of-the-art paper includes a detailed literature review of dynamic models of MR fluid dampers for describing their complex dynamic behavior and control algorithms considering the characteristics of MR fluid dampers. This extensive review provides references to semiactive control systems using MR fluid dampers. The MR fluid damper-based semiactive control systems are shown to have the potential for mitigating the responses of full-scale civil engineering structures under natural hazards.

독립식 전자석 시스템을 갖는 준능동형 압착식 MR감쇠장치 : 전자석 크기 변화에 따른 동적성능평가

허광희 ( Heo Gwanghee ),김충길 ( Kim Chunggil ),전준용 ( Jeon Joonryong ),이제훈 ( Lee Jaehoon ),이의선 ( Lee Yeusun ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1

Usually, a semi-active MR damper which adapts MR fluid is an economical and efficient control Specially in the field of construction, this MR damper is applied to the great extent in order to efficiently control the vibration occurring in structures. This paper presents the experimental research which was made to evaluate how the size of electromagnet affects the control capacity of MR dampers. For better performance, an independent electromagnet system was made, and also two dampers, both with the same size of orifice gap, were developed: one a MR damper of 1000N degree and another of 4000N degree. Inputting various electric currents under the same condition, a dynamic load experiment was performed on those dampers. Control capacities from each damper are visualized in the curve where the proportion of input electricity vs control capacity is compared. The experiment conclusively proves that the size of electromagnet significantly determines the movement and mechanism of MR fluid. Therefore, it is proven that the two MR dampers developed in this research are practical as a semi-active control device, and also that a decision on the size of electromagnet should be carefully made in designing and developing a MR damper because it has been found crucial.

MR 유체물성과 오리피스 형상에 대한 MR 댐퍼 성능비교 연구

권영철(Kwon, Young-Chul),박삼진(Park, S.J.),김기영(Kim, Ki-Young),백대성(Baek, Dae-Sung),이석현(Lee, Seok-Hyun) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.3

MR 댐퍼는 자기장의 영향으로 인한 MR 유체의 응집현상으로 자기전단력을 발생한다. MR 유체는 기존유체 와 자기입자로 구성되어 있다. 본 연구에서 밀도 1.3, 1.5, 1.7g/㎤ 그리고 점도 1,000, 10,000cP를 가지는 MR 유체 6 종과 오리피스 형상 6종에 대한 MR 댐퍼의 댐핑력을 조사하였다. MR 유체의 밀도와 점도 변화에 따라서 MR 댐퍼 의 댐핑력이 변하였다. 오리피스 형상변화에 대한 댐핑력은 오리피스 갭이 적고 길이가 짧을수록 크게 나타났다. 이 들 연구결과로부터 MR 댐퍼의 최적설계를 위해서는 MR 유체의 선정과 오리피스 형상이 중요한 설계변수임을 확인하였다. MR(Magneto-Rheological) damper generates the magnetic shear force due to the cohesiveness of MR fluid influenced by a magnetic field. MR fluid consists of magnetic particles and a base liquid. In the present study, the damping forces of MR damper were investigated for density 1.3, 1.5 and 1.7 g/㎤, and viscosity 1000 and 10000cp, and for the change of orifice shapes. It was found that the increase in the density and viscosity of MR fluid could change the damping force of MR damper due to the magnetic effects. Also, the damping forces on orifice shapes increased as the orifice gap and length decreased. These results showed that the properties of MR fluid and orifice shapes were important for the optimum design of MR damper.

Recent developments of regenerative magnetorheological (RMR) damper: A review

Sakib Muhammad Mohtasim,Rubel Ahammed,Md. Mahfujur Rahman,Md Mahbubur Rashid,Rupal Roy,Abdul Aziz 한국유변학회 2021 Korea-Australia rheology journal Vol.33 No.3

Magnetorheological (MR) dampers are becoming popular smart devices with controllable higher damping properties. This paper presents an inclusive review of energy harvesting MR dampers. The classifications of energy harvesting MR dampers, operating principles, structural design, mathematical models, fluid models, experimental investigation, and applications are classified and reviewed. The regenerative MR dampers have self-power capability, and self-sensing capability to control higher performance and it is an important feature of regenerative MR dampers. The review indicates that regenerative MR dampers have enough power generation capacity to power MR dampers and higher damping performances. It has been found that a single-ended monotube regenerative MR (RMR) damper has maximum power generation capabilities than other RMR dampers.

State-of-the-art developments of bypass Magnetorheological (MR) dampers: A review

Mohammad Abdul Aziz,Saiied M. Aminossadati 한국유변학회 2021 Korea-Australia rheology journal Vol.33 No.3

Magneto-rheological (MR) dampers using MR fluids with controllable rheological properties are mainly utilized in automobiles, structures, electrical transmission lines, medical applications, agricultural engineering, and military equipment. This paper presents a comprehensive review of bypass MR dampers. The principles of operation, design structures, analytical models, experimental analysis, and applications of MR dampers are classified and reviewed. The bypass MR dampers have better MR fluid stability and sedimentation control compared to MR dampers. This is important for maintaining homogeneous magnetic flux distribution throughout the fluid area. The advantageous features of external bypass MR dampers over internal bypass dampers are the higher shear stress, the damping force controllability, and the higher damping force they can generate.

State-of-the-art recent developments of large magnetorheological (MR) dampers: a review

Abdul Aziz Mohammad,Mohtasim Sakib Muhammad,Ahammed Rubel 한국유변학회 2022 Korea-Australia rheology journal Vol.34 No.2

Large MR (MR) dampers are popular due to their higher damping force capabilities which makes them suitable in the field of civil engineering, structural engineering, suspension bridge structure, mining engineering, and agricultural engineering applications. This paper presents a comprehensive review of large MR dampers. The classifications and applications of large MR dampers, the principle of operation, different fluid models, their structural design and control systems are classified and reviewed in this paper. The large MR dampers have higher damping force controllability than conventional MR dampers. The review indicates that the large MR dampers have enough vibration mitigation ability and higher damping performances.

Modeling of a magneto-rheological (MR) fluid damper using a self tuning fuzzy mechanism

안경관,DINH QUANG TRUONG,Muhammad Aminul Islam 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.5

A magneto-rheological (MR) fluid damper is a semi-active control device that has recently begun to receive more attention in the vibration control community. However, the inherent nonlinear nature of the MR fluid damper makes it challenging to use this device to achieve high damping control system performance. The development of an accurate modeling method for a MR fluid damper is necessary because of its unique characteristics. Our goal was to develop an alternative method for modeling an MR fluid damper by using a self tuning fuzzy (STF) method based on neural technique. The behavior of the researched damper is directly estimated through a fuzzy mapping system. To improve the accuracy of the STF model, a back propagation and a gradient descent method are used to train online the fuzzy parameters to minimize the model error function. A series of simulations were done to validate the effectiveness of the suggested modeling method when compared with the data measured from experiments on a test rig with a researched MR fluid damper. Finally, modeling results show that the proposed STF interference system trained online by using neural technique could describe well the behavior of the MR fluid damper without need of calculation time for generating the model parameters.

Advancement in energy harvesting magneto-rheological fluid damper: A review

Raju Ahamed,Md Meftahul Ferdaus,Yancheng Li 한국유변학회 2016 Korea-Australia rheology journal Vol.28 No.4

In this paper, a comprehensive review of the present literature on energy generated magnetorheological (MR) fluid based damper, modeling and applications of the MR damper are presented. The review starts with an introduction of the basic of MR fluid and their different modes, consequences with different types of MR fluids based devices, and their relevant applications. Besides, various forms of MR damper and its applications are presented. Following this, the modeling of the MR fluids and the modeling of the MR fluid based damper are deliberated according to arrangement and configurations. Finally, the review ends with the design and advancement issues, performance analysis matters, and analytical modeling of energy generated magnetorheological fluid damper systems.

MR 유체를 이용한 운전석 댐퍼의 성능특성

남무호 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.5

This paper presents the development of a semi-active seat damper using MR fluids and the performance analysis of seat suspension system with a MR seat damper. An annular orifice type MR seat damper is proposed for a seat suspension of a commercial vehicle. After formulating the governing equation of motion, then an appropriate size of the seat damper is designed and manufactured. Following the evaluation of field-dependant damping force characteristics, the controllability of the damping force is experimentally demonstrated in time domain by adopting PID controller. A semi-active seat sus-pension with the proposed MR damper is constructed and its dynamic model is established. Subsequently, vibration con-trol capability of the semi-active suspension system is investigated by employing the sky-hook controller.