Electromagnetic design for performance improvement of an MR valve

Lee, Hyung-Don; Nam, Yoon Kwon; Park, Myeong-Kwan

doi:10.3233/jae-2012-1513

Cited by 7 publications

(3 citation statements)

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“…There are papers [ 29 , 30 , 31 ] dealing with the optimal design of an MR valve using finite element analysis (FEA), but they are focused only on maximizing the static magnetic field range in the gap of the damper, and the dynamic behavior (response time) of the MR damper is not taken into consideration. Lee et al [ 32 ] proposed methods for optimizing the magnetic field range of the MR damper and, also, the dynamic behavior. However, the proposed MR valve exhibited a response time between 28–125 ms, which is too long for use in semi-active car suspension.…”

Section: Introductionmentioning

confidence: 99%

Novel Approaches to the Design of an Ultra-Fast Magnetorheological Valve for Semi-Active Control

et al. 2021

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This article presents a list of suitable techniques and materials leading to the design of an ultra-fast magnetorheological (MR) valve. Two approaches for achieving the short response time are proposed: (a) by means of material, and (b) by means of the shape. Within the shape approach, the revolutionary technique of 3D metal printing using a selective laser melting (SLM) method was tested. The suitability of the materials and techniques is addressed based on the length of the response time, which is determined by the FEM. The simulation results determine the response time of the magnetic flux density on the step signal of the current. Subsequently, the response time is verified by the measurement of the simple magnetorheological valve. The following materials were tested: martensitic stainless steel AISI 420A (X20Cr13), cutting steel 11SMn30, pure iron for SLM, Sintex SMC STX prototyping material, ferrite N87, and Vacoflux 50. A special technique involving grooves was used for preventing eddy currents on materials with a high electrical conductivity. The simulation and experimental results indicate that a response time shorter than 2.5 ms can be achieved using materials such as Sintex SMC prototyping, ferrite N87, and grooved variants of metal pistons.

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Section: Introductionmentioning

confidence: 99%

Novel Approaches to the Design of an Ultra-Fast Magnetorheological Valve for Semi-Active Control

et al. 2021

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“…Papers [13,14] proposed an optimal design of MR valve using finite element method to maximize static range of the damper without considering the response time of MR damper. Lee et al [15] proposed methods for optimizing the dynamic range of MR damper, but the proposed MR valve exhibited the response time between 28 and 125 ms. To effective control of system in the application of the vehicle suspension, the response time of MR damper should be smaller than the period corresponding to the highest controlled frequency. If the response time is longer, the system is not able to react on the change of the damping state in the wheel mode and hence the efficiency is lower [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Response time effect of magnetorheological dampers in a semi-active vehicle suspension system: performance assessment with quantitative feedback theory

Jeyasenthil

Yoon

Choi

2019

Smart Mater. Struct.

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This paper presents vibration control performances of a semi-active full-car suspension system with very-fast response magneto-rheological (MR) dampers. In this study, MR damper dynamics is captured by the first order model which is realistic, efficient and simple form. As a first step, the response time of the proposed MR damper and one of commercial MR dampers is experimentally identified as around 7 ms and 26 ms, respectively. The control strategies to access ride comfort and road holding of the full-car suspension system are adopted as the passive, the sky-hook control and the quantitative feedback theory (QFT). Especially, the solid design of the QFT is undertaken in frequency domain. The suspension performance of the different controllers with two different MR dampers are evaluated and compared at random road excitation. It is shown that the peak value of the vertical acceleration of the suspension with the fast response MR damper is remarkably reduced compared with the slow response MR damper under the QFT control realization. It is also shown that between the skyhook and the QFT controller with the fast response MR damper, the acceleration power spectral density is reduced by 30% via the QFT controller.

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“…Papers [9,10] deal with optimal design of MR valve using FEM analysis, but they are focused only on maximizing the static range of the damper and the response time of the MR damper is not taken into account. Authors of the study [11] also proposed methods for optimizing range of the MR damper and dynamic behaviour. However proposed MR valve has time response between 28-125 ms which is too long for using for semi-active car suspension.…”

Section: Introductionmentioning

confidence: 99%

Limiting factors of the response time of the magnetorheological damper

Strecker

Roupec

Mazůrek

et al. 2015

International Journal of Applied Electromagnetics and Mechanics

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Magnetorheological dampers seem to be suitable for the adaptive car suspension systems. For proper operation of the semi-active algorithms (skyhook, groundhook), the force response of the damper must be fast enough. In this paper, the response time of the Delphi vehicle MR damper is examined and the sources of the overall force time response on the control voltage are discussed. One of the main sources of the response time seems to be electro-magnetic circuit of the MR damper. A principle of an optimal controller for reducing response of the coil's current on the control voltage is designed. However, the measured overall force time response with fast current controller was not reduced as expected. Therefore, a FEM simulation of the magnetic circuit was made. It shows that after an optimization of the current controller, eddy currents in the coil's core cause long time response and therefore they are the limiting factor of the response time of the MR damper. These simulations were verified by the measurements and some recommendations about improving the pistons construction are given at the end.

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Electromagnetic design for performance improvement of an MR valve

Cited by 7 publications

References 0 publications

Novel Approaches to the Design of an Ultra-Fast Magnetorheological Valve for Semi-Active Control

Novel Approaches to the Design of an Ultra-Fast Magnetorheological Valve for Semi-Active Control

Response time effect of magnetorheological dampers in a semi-active vehicle suspension system: performance assessment with quantitative feedback theory

Limiting factors of the response time of the magnetorheological damper

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