Internal magnetic field tests and magnetic field coupling model of a three-coil magnetorheological damper

Yang, Yang; Xu, Zhao‐Dong; Guo, Yingqing; Xu, Yanwei; Zhang, Jie

doi:10.1177/1045389x20943948

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…When the current comes 0 A the yield strength does not disappear, which means the MRF keeps a certain inherent yield strength [28]. The saturation characteristics at high level current cases and the inherent yield characteristics at zero-field are consistent with previous research [29]. The identification of F y has the following presentation…”

Section: Parameter Identificationsupporting

confidence: 86%

Single input magnetorheological pseudo negative stiffness control for bridge stay cables

Xu¹,

Xu²,

Guo³

et al. 2020

Smart Mater. Struct.

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The bridge stay cable, one of the most critical components in cable-stayed bridges, is vulnerable to vibrations owing to its low inherent damping capacity. Thus effective vibration control technology for bridge stay cables is extremely critical to safe operations of cable-stayed bridges. Several countermeasures have been presented and/or implemented to mitigate this vibration; however the passive method can only add a small amount of damping to the cables, excessive energy demand of active control devices severely limits its practicality, the semi-active control methods still have the drawbacks of complex state estimation module and a large amount of control algorithm calculation. This paper proposes a practical magnetorheological pseudo negative stiffness (MR-PNS) control system coupled with control strategy for bridge stay cables. The current reference point is introduced in the dynamic modeling of the MR-PNS control system to characterize the current control strategy. This paper investigates the adjustable of MR-PNS control system performance and energy consumption caused by different current strategies. Taking the vibration control of the Nanjing Second Yangtze River Bridge J20 cable as an example, the simulation results highlight the advantages of the MR-PNS control system that the failure area is small, the quasi-optimal area is wide, and it can still keep sort of vibration damping performance in the degenerate area. The model cable vibration control test proves the feasibility and efficiency of the single input MR-PNS bridge stay cables control method.

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Section: Parameter Identificationsupporting

confidence: 86%

Single input magnetorheological pseudo negative stiffness control for bridge stay cables

Xu¹,

Xu²,

Guo³

et al. 2020

Smart Mater. Struct.

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“…The modified two‐column model for the MR fluid proposed above can finely describe relationship between the yield shear stress of the MR fluid and the magnetic induction intensities. The variation of the magnetic induction intensity with current can be revealed in the magnetic field coupling model for the three‐coil MR dampers proposed in a previous study about the magnetic field distribution of the three‐coil MR dampers, 34 as shown in Equation 9,

B_{E} = ((), 0.916 I - 0.048) \frac{italicNI μ_{0} μ}{((), D + h) \cdot \ln ([], \frac{(D + 2 h)}{D})}, B_{I} = ((), 1.264 I - 0.177) \frac{italicNI μ_{0} μ}{((), D + h) \cdot \ln ([], \frac{(D + 2 h)}{D})},

in which B E is the magnetic induction intensities for the external damping gap and B I is the magnetic induction intensities for the internal damping gap. Combining the modified two‐column for the MR fluid and the magnetic field coupling model for the three‐coil MR damper, the relationship between the yield shear stress and the excitation current can be expressed as follows:

τ_{yE} = ([], \frac{12 A r^{3} χ^{2} {B_{E}}^{2} φ}{5 μ_{0} {((), 1 + χ_{1})}^{2} {((), 2 r + 2 t)}^{3}}) \cdot D ((), n) + τ_{0}, τ_{yI} = ([], \frac{12 A r^{3} χ^{2} {B_{I}}^{2} φ}{5 μ_{0} {((), 1 + χ_{1})}^{2} {((), 2 r + 2 t)}^{3}}) \cdot D ((), n) + τ_{0},

in which τ yE is the yield shear stress of the MR fluid of the external damping gap and τ yI is the yield shear stress of the MR fluid of the internal damping gap.…”

Section: Modified Micromodel Of the Mr Fluidmentioning

confidence: 98%

“…The modified two-column model for the MR fluid proposed above can finely describe relationship between the yield shear stress of the MR fluid and the magnetic induction intensities. The variation of the magnetic induction intensity with current can be revealed in the magnetic field coupling model for the three-coil MR dampers proposed in a previous study about the magnetic field distribution of the three-coil MR dampers, 34 as shown in Equation 9,…”

Section: Experimental Verificationmentioning

confidence: 99%

“…The reason why when all three coils are energized, the damping force of the “+−+” electrified condition is much larger than the “+++” electrified condition can be fundamentally explained by the magnetic field distribution inside the damper. The internal magnetic field tests of this three‐coil MR damper have been conducted by our group, 34 and according to the magnetic field tests, the “+−+” electrified condition can generate the highest magnetic induction intensities. The basic principle of the magnetic coupling effect for the three energized coils is that when the current directions of the three coils are the same (+++), the magnetic induction intensities in the middle are greatly attenuated and the magnetic induction intensities at the ends are increased, while when current direction of the middle coil is different from the coils on two ends (+−+), the magnetic induction intensities in the middle were highly improved and the magnetic induction intensities at the ends are decreased.…”

Section: Performance Tests Of the Three‐coil Mr Dampermentioning

confidence: 99%

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Performance tests and microstructure‐based sigmoid model for a three‐coil magnetorheological damper

Yang

Guo

et al. 2021

Structural Contr & Hlth

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Magnetorheological (MR) damper is one of the most promising smart devices for dissipating seismic energy and reducing structural vibrations. The MR dampers with multiple coils are widely adopted to enhance the output damping forces and seismic performance. In order to study the dynamic characteristics of multicoil MR dampers from a micro to macro viewpoint, a three-coil MR damper was designed and manufactured in this paper. The performance tests of the three-coil MR damper under different excitation currents, displacement amplitudes, frequencies, and coil combinations were conducted.Assuming that the distance between two adjacent ferromagnetic particles meets chi-square distribution, the two-column micromodel for the MR fluid was modified by introducing a distribution parameter. The modified MR fluid micromodel was verified by comparing the damping forces calculated by this model with experimental data. Combining the modified micromodel for the MR fluid and the double-sigmoid model for MR dampers, a mathematical model for the three-coil MR damper was proposed. The microstructure-based sigmoid model considers the effects of yield shear stress of the MR fluid and internal magnetic induction intensity on the damping force. The comparison of the proposed model and the performance test data shows that the microstructure-based sigmoid model can finely describe the dynamic characteristics and magnetic saturation properties of the three-coil MR damper under different excitation currents and loading conditions, which provides a good basis for control strategies and dynamic analysis of structures with multicoil MR dampers. K E Y W O R D S microstructure-based sigmoid model, model verification, modified micromodel, performance tests, three-coil magnetorheological damper 1 | INTRODUCTIONMagnetorheological (MR) fluid is a typical intelligent material, which is a suspension formed by the distribution of magnetic particles in micron or nanometer size in a carrier liquid. It mainly contains magnetic particles, carrier liquid, and various additives. The most significant feature of the MR fluid is its magnetorheological effect; that is, the magnetic particles in the MR fluid can be transformed from a random disordered state to ordered chain or columnar structure in

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“…Nanthakumar, A J D et al [22] carried out fluid flow principled analysis and electromagnetic flux analysis for the more important parameters such as fluid and magnetic flux of the magnetorheological damper and finally calculated the damping force generated by the damper. Yang Yang,and Zhao-Dong Xu et al [23]. Studied the complex magnetic field distribution in the case of magnetorheological dampers with three coils.…”

Section: Introductionmentioning

confidence: 99%

Design and damping performance analysis of a multistage meandering hybrid valved magnetorheological damper

Zhu,

Yang,

Xie

et al. 2024

Phys. Scr.

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The current valved magnetorheological damper has a low space utilization of the piston head, which results in insufficient output damping force, and this paper proposed a multistage meandering hybrid valved magnetorheological damper. The three-dimensional structure of the damper is established and its mathematical model is derived. The electromagnetic field finite element analysis was used to simulate the damper structure, and a comparison was made between the results of traditional annular valve structures and those of multistage meandering hybrid valve. The damping performance of a multistage meandering hybrid valved damper was experimentally studied. The results indicate that the maximum output damping force of the multistage meandering hybrid valved structure is increased by 62.2% over the traditional annular valved structure at a current of 2.4 A and a coil turn count of 350 turns. The structure can effectively utilize the piston head space and improve the output damping force of the damper. The output damping force of the damper reaches 486.4N and the adjustable coefficient K reaches 8.6. The numerical simulation results are the same as the actual experimental results.

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Internal magnetic field tests and magnetic field coupling model of a three-coil magnetorheological damper

Cited by 8 publications

References 27 publications

Single input magnetorheological pseudo negative stiffness control for bridge stay cables

Single input magnetorheological pseudo negative stiffness control for bridge stay cables

Performance tests and microstructure‐based sigmoid model for a three‐coil magnetorheological damper

Design and damping performance analysis of a multistage meandering hybrid valved magnetorheological damper

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