Experimental study on response time of magnetorheological damper

Wu, Guorong; Feng, Zhimin; Zhang, Gang; Hou, Zhenning

doi:10.1109/aimsec.2011.6010142

Cited by 6 publications

(10 citation statements)

References 2 publications

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“…The two Helmholtz coils generate two mutually perpendicular magnetic fields to control the deflection of the electron beam. Because the two Helmholtz coils are identical, only the electrical behavior of one Helmholtz coil is analyzed, and it can be described by Kirchhoff's equilibrium equation 5,19 :…”

Section: Methods 21 | Electrical Modelmentioning

confidence: 99%

italicRi goodbreak+ N \frac{normald ϕ}{normald t} goodbreak= U

where R is the sum of the resistance in a given circuit (Ω), i is the coil current (A), N is the number of coil turns, Ф is the magnetic flux through each coil turn (Wb), t is the time (s), and U is the voltage (V). The first part on the left side of the equation represents the voltage drop of the coil resistance, and the second part is the induced electromotive force formed in the Helmholtz coil.…”

Section: Methodsmentioning

confidence: 99%

“…There are various ways to define the current response time of a coil. 4,[16][17][18][19] Among them, the period for the current to reach 95% of the expected value from the initial value is widely adopted 17,18 and is used in this research. For a coil without an iron core, such as the deflection coil used in electron-beam thermal assessment equipment, 11 the current response time can account for approximately 100% of the total response time.…”

Section: Introductionmentioning

confidence: 99%

“…The electrical behavior of a coil can be described by Kirchhoff's equilibrium equation, 5,19 which shows that the change velocity of the current increases with an increasing voltage amplitude. Based on this rule, we propose a novel method to eliminate the current oscillations and shorten the current response time by designing an overshoot voltage waveform.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of the inductance on the response time of the current relative to the voltage (the current response time) should be considered for all coils. There are various ways to define the current response time of a coil 4,16–19 . Among them, the period for the current to reach 95% of the expected value from the initial value is widely adopted 17,18 and is used in this research.…”

Section: Introductionmentioning

confidence: 99%

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A voltage waveform design method for shortening current response time of a coil

Dou

Long

Yao

et al. 2023

Circuit Theory & Apps

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SummaryCoils are widely used in magnetorheological dampers, solenoid valves, and electron guns, where a quick response of the magnetic induction to the excitation voltage is needed. To achieve a quick response, the response time of the magnetic induction relative to the current and that of the current relative to the voltage should be shortened as much as possible. The latter is dominant in the total response time and can be shortened by using voltage control with an increased resistance or current control. The current time responses of the Helmholtz coils based on voltage control with an increased resistance and current control are measured. The results indicate that the current response times of the coils based on voltage control with resistances of 23.7 and 162 Ω and current control with a resistance of 23.7 Ω are 235.3, 42.3, and 62.1 μs, respectively. The current time responses of the voltage control are smooth, while those of the current control have large oscillations. Based on Kirchhoff's equilibrium equation, an overshoot voltage waveform design method is proposed to shorten the current response time and eliminate the current oscillations. The experimental results show that the current time response is smooth, and the current response time can be shortened by 91.8%, 54.4%, and 68.9% in comparison with those of the former three control cases. The demonstration experiments of the effect of the different control methods on the electron‐beam scanning path and hot spot distribution show that the scanning path and dwell duration are closer to the expected ones with the proposed method. The proposed method is of great value for improving the damping performance of a magnetorheological damper, the accuracy of the fluid injection of a solenoid valve, and the accuracy of the electron‐beam thermal assessment.

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Section: Methods 21 | Electrical Modelmentioning

confidence: 99%

italicRi goodbreak+ N \frac{normald ϕ}{normald t} goodbreak= U

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A voltage waveform design method for shortening current response time of a coil

Dou

Long

Yao

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

Design and testing of magnetorheological valve with fast force response time and great dynamic force range

Kubík

Macháček

Strecker

et al. 2017

Smart Mater. Struct.

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The paper deals with design, simulation and experimental testing of a magnetorheological (MR) valve with short response time. The short response time is achieved by a suitable design of an active zone in combination with use of a ferrite material for magnetic circuit. The magneto-static model and the simplified hydraulic model of the MR valve are examined and experimentally verified. The development the MR valve achieves an average response time 4.1 ms and the maximum dynamic force range of eight.

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Insight into the response time of fail-safe magnetorheological damper

Jeniš¹,

Kubík²,

Macháček³

et al. 2020

Smart Mater. Struct.

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The significant problem of magnetorheological (MR) dampers is their poor fail-safe ability. In the case of power supply failure, the damper remains in a low damping state which is dangerous for several technical applications. This can be solved by accommodating a permanent magnet to the magnetic circuit of the damper. Currently, the MR dampers are used in progressive semiactive (S/A) control of suspension systems. The dynamics (force response time) of the damper is an important parameter that affects the performance of semiactive control. The main goal of this paper is to introduce the dynamic behavior of MR damper with a permanent magnet. The damper design with the permanent magnet in the magnetic circuit, transient magnetic simulation including magnetic hysteresis and eddy currents, and experiments are presented. The magnetic field response time and MR damper force response time are measured and also determined from magnetic simulation. The permanent magnet significantly influences the MR damper dynamics. The decrease of the damping force from a fail-safe state -medium damping to off-state -low damping is significantly faster (2 ms, -1A) than the increase to on-state -high damping (12 ms, 1A). The exact value is depending on the electric current magnitude and piston velocity. The damper achieved fail-safe damping force approximately 1/3 of the maximum damping force. The exact value of the fail-safe force is magnetization history-dependent. The maximum dynamic force range is 8.5 which is comparable with the common design of MR damper.

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Experimental study on response time of magnetorheological damper

Cited by 6 publications

References 2 publications

A voltage waveform design method for shortening current response time of a coil

A voltage waveform design method for shortening current response time of a coil

Design and testing of magnetorheological valve with fast force response time and great dynamic force range

Insight into the response time of fail-safe magnetorheological damper

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