Magnetorheological valve in servo applications

Kostamo, Esa; Kostamo, Jari; Kajaste, Jyrki; Pietola, Matti

doi:10.1177/1045389x12436732

Cited by 13 publications

(13 citation statements)

References 20 publications

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“…It is clearly observed from the figure that the unbalanced position (height) of the two plates has been well controlled to be exactly balanced by applying the input current to MR valves. It is finally remarked that the enhancement of the tracking accuracy and balancing speed can be achieved by choosing appropriate core materials which can generate low eddy currents (Kostamo et al, 2012;Kubı´k et al, 2017;Sahin et al, 2012;Strmiska, 2017).…”

Section: Fine Position Controlmentioning

confidence: 99%

“…When MR fluid is used for the design of a controllable valve, several benefits are realized such as high efficiency (Ai et al, 2006;Hu et al, 2014;Wang et al, 2009;Yoo and Wereley, 2002), geometric optimization (Nguyen et al, 2008;Rosenfeld and Wereley, 2004;Samad et al, 2012;Zhu et al, 2012b), compact design of multiple flow paths (Hu et al, 2017;Imaduddin et al, 2015), and fast response time (Kostamo et al, 2012;Kubı´k et al, 2017;Sahin et al, 2012;Strmiska, 2017). Yoo and Wereley (2004) and Yoo et al (2005) proposed a small size of MR hydraulic actuation system composed of Wheatstone bridge circuit using MR valve and gear pump and demonstrated the controllability of external forces.…”

Section: Introductionmentioning

confidence: 99%

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Fine position control of a vehicle maintenance lift system using a hydraulic unit activated by magnetorheological valves

Lee

Shin

Cha

et al. 2019

Journal of Intelligent Material Systems and Structures

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This work presents a new concept of fine position control of vehicle lift systems used for maintenance services, to facilitate specialized tasks such as height balancing of tilted vehicles. The research goal is accomplished by utilizing a controllable hydraulic circuit associated with magnetorheological valves. After establishing the required dynamic forces and position control range of the vehicle’s lift system, a two-coil type of magnetorheological valve is designed with consideration of the field-dependent properties of the magnetorheological fluid and the magnetic flux intensity, which is analyzed using the finite element method. Magnetorheological valves are then manufactured and the pressure drops are evaluated as a function of the input current (magnetic field). A hydraulic circuit with magnetorheological valves is formulated to control the height of the lift with an accuracy of ±1 mm with a load of 2000 kg on the each lifts. It is experimentally demonstrated that ramp and sinusoidal positions (or height) are well tracked within the targeted accuracy by controlling the magnetorheological valves. In addition, it is shown that the tilted position of the loaded vehicle with an eccentric mass placed on the lift is well controlled showing the balanced height.

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Section: Fine Position Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fine position control of a vehicle maintenance lift system using a hydraulic unit activated by magnetorheological valves

Lee

Shin

Cha

et al. 2019

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

show abstract

“…For instance, this approach is applied at low frequency transformers using isolated sheets. A MR valve with a magnetic circuit composed of isolated sheets was also published in [ 48 , 49 ]. However, this solution allows the elimination of eddy currents only to a certain extent.…”

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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“…The ability of MR fluids to change their apparent viscosity makes them an ideal means of controlling the flow rate of fluid through an orifice, facilitating their use in damping applications. Other relevant studies in the literature include the use of MR valves for pressure and force control [7], and the investigation of the influence of valve geometry on the response time [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Flow-Blocking Ability of a Novel Magneto-Rheological Damper Unit

Meeser

Kaul

Schalk

2017

Journal of Testing and Evaluation

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This paper investigates the flow-blocking ability of a novel valve-mode magneto-rheological (MR) device to determine whether it can be used to replace the existing electro-mechanical solenoid valves that are used to control the semi-active spring characteristics in a four-state, semi-active vehicle suspension system (called the 4S 4 system). MR fluids exhibit a reversible behavior that is controlled by changing the intensity of an externally applied magnetic field, allowing a change in the effective viscosity of the fluid. A mathematical model of the proposed flow-blocking valve has been developed using a combination of the quasi-Newtonian fluid model and the Bingham plastic model. This model has been modified with suitable parameters and is used to predict the blocking characteristics of the MR valve. An experimental setup has been developed with a prototype triple-pass valve mode MR fluid channel. The experimental results demonstrate that the MR valve designed and developed in this study is capable of generating a significantly high-pressure drop at very low flow rates, effectively blocking flow for practical use in the 4S 4 system.

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Magnetorheological valve in servo applications

Cited by 13 publications

References 20 publications

Fine position control of a vehicle maintenance lift system using a hydraulic unit activated by magnetorheological valves

Fine position control of a vehicle maintenance lift system using a hydraulic unit activated by magnetorheological valves

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

Investigation into the Flow-Blocking Ability of a Novel Magneto-Rheological Damper Unit

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