Fail-Safe Magneto-Rheological Fluid Dampers for Off-Highway, High-Payload Vehicles

Gordaninejad, Faramarz; Kelso, Shawn P.

doi:10.1177/104538900772664738

Cited by 21 publications

(22 citation statements)

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“…5) Stearic acid can increase the viscosity and sedimentary stability of MRF, but can't improve shear yield stress of MRF. 6) In magnetic field of 237 kA/m, the shear yield stress of MRF based on special shock absorption fluid is 18.34 kPa and the shear yield stress of MRF based on 45 # transformer oil is 14.26 kPa.…”

Section: Discussionmentioning

confidence: 99%

Characteristic analysis of magnetorheological fluid based on different carriers

Zhang¹,

Zhang²,

Jia³

2008

J. Cent. South Univ. Technol.

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In order to prepare special MRFs to satisfy the demands of tracked vehicle, two different carrier fluids were used to prepare MRFs. Preparation of MRF, which are based on carrier of special shock absorption fluid and 45 # transformer oil, was finished. And characteristics of these samples were tested and analyzed. The results show that Tween-80 and Span-80 can improve the sedimentary stability, and the larger mass fraction can also increase the sedimentary stability. Using 45 # transformer oil instead of special shock absorption fluid as a carrier of MRF, the shear yield stress remains nearly constant but the viscosity and the sedimentary stability are reduced. The MRF with diameter of 2.73 µm shows better sedimentary stability than that of the MRF with diameter of 2.30 µm, or 4.02 µm. Stearic acid obviously improves sedimentary stability and off-state viscosity, but has no function on the shear yield stress. In magnetic field of 237 kA/m, the shear yield stress of MRF based on special shock absorption fluid is 18.34 kPa and the shear yield stress of MRF based on 45 # transformer oil is 14.26 kPa.

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Section: Discussionmentioning

confidence: 99%

Characteristic analysis of magnetorheological fluid based on different carriers

Zhang¹,

Zhang²,

Jia³

2008

J. Cent. South Univ. Technol.

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“…The road input is y0 . The equation of motion for the system excited by the road profile can be expressed as follows: (2) where F is the change in the spring force from the static equilibrium condition for tire and Fd is the total damping force, which can be written as follows:…”

Section: Quarter-car Model Of Iimmwvmentioning

confidence: 99%

“…They can offer an attractive solution to controllable energy absorption, and require minimal power input A new generation of MIRF dampers has been developed that provides a fail-safe and robust vibration damping solution [1,2]. Several innovative prototype MRF dampers have been consfructed and examined at our laboratory for different applications, such as mountain bicycles, motorcycles, off-road high-payload vehicles and scaled bridge models.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent skyhook control of HMMWV suspension using a fail-safe magnetorheological damper

et al. 2003

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In this paper, a theoretical study is presented to examine the behavior a fail-sale magneto-rheological fluid (MRF) damper based on a temperature compensated skyhook strategy for a quarter car model of a High Mobility Multipurpose Wheeled Vehicle (HMMWV). A fail-safe MRF damper is a controllable semi-active device that in the event ofpower or control system failure behaves as a passive damper with certain viscous damping capacity. The damper's viscous force changes significantly with temperature. Vehicle suspension system is required to operate in a wide range of temperature. The temperature effects on the perfonnance of MRF damper should be considered in the control system design. Displacement and acceleration response of the vehicle sprung mass for the quarter car model are discussed at the operating temperature range of a MIRF damper. Simulation results under off-road excitation demonstrated that the compensated skyhook control system improves MRF damper performance in reducing the sprung mass displacement and acceleration compared to the uncompensated skyhook control system.

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“…If there was a fault in the system, the MR damper could act as a passive damping device within certain performance parameters. Potential applications of MR dampers include the areas of automotive and aerospace industries [3,4,5], seismic protection of bridges and buildings [6,7]. MR fluids demonstrate highly nonlinear complex behavior due to the applied magnetic field, applied load, strain amplitude and frequency of excitation in the dynamic conditions.…”

Section: Introductionmentioning

confidence: 99%