Magnetorheological fluid composites synthesized for helicopter landing gear applications

Powell, Louise A.; Hu, Wei; Wereley, Norman M.

doi:10.1177/1045389x13476153

Cited by 45 publications

(23 citation statements)

References 15 publications

(22 reference statements)

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“…Numerous studies have identified the critical features of the MR damper, such as the controllable dynamic range of damping force, rapid adjustment response, and low energy consumption [1][2][3][4]. The initial implementation of the MR damper was in the automotive industry [5][6][7]; more recently, it has penetrated other sectors, including aerospace [8,9], marine structure [10], military [11,12], biomedical devices [13,14], home appliances [15], railway [16][17][18], and civil engineering [19][20][21]. The fundamental principle of the MR damper is similar to that of the conventional passive damper, which dissipates kinetic energy as heat through the flow restriction mechanism.…”

Section: Introductionmentioning

confidence: 99%

A Concentric Design of a Bypass Magnetorheological Fluid Damper with a Serpentine Flux Valve

Idris¹,

Imaduddin

Ubaidillah

et al. 2020

Actuators

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This work presents a new concentric design structure of a bypass magnetorheological (MR) damper with a serpentine flux valve type. In this design, the serpentine valve is installed not in the middle of the piston but on the bypass channel of the damper. However, to make it less bulky, the location of the valve installation is chosen to be in line with the cylinder axis, which is different from the common configuration of the bypass damper. With the proposed design concept, the performance flexibility of the bypass configuration and the compactness of the piston valve configuration can be accomplished. In this study, these benefits were demonstrated by firstly deriving an analytical model of the proposed MR damper focusing on the bypass concentric valve structure, which is vital in determining the damping force characteristics. The prototype of MR damper was also fabricated and characterized using the dynamic test machine. The simulation results show that the damping force could be adjusted from 20 N in the off-state to around 600 N in the on-state with 0.3 A of excitation current. In the experiments, during low piston velocity measurement, the on-state results from the simulation were generally in good agreement with the experimental results. However, with the increase in piston velocity, the deviation between the simulation and the experiment gets higher. The deviations are most probably due to seal frictions that were not accounted for in the model. The seal friction is probably dominant as the seals in the prototype need to be prepared for handling higher fluid pressure. As a result, the frictions are quite prevalent and significantly affect the measured off-state damping forces as well, where it was recorded ten times higher than the predicted values from the model. Nevertheless, although there were deviations, the dynamic range of the concentric bypass structure is still 1.5 times higher than the conventional structure and the new structure can be potentially explored more to achieve an improved MR damper design.

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Section: Introductionmentioning

confidence: 99%

A Concentric Design of a Bypass Magnetorheological Fluid Damper with a Serpentine Flux Valve

Idris¹,

Imaduddin

Ubaidillah

et al. 2020

Actuators

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“…In the past few years, elements of smart and functional materials have been added to the conventional composite structures to develop a new generation of the laminated composite structures [8]. Researchers have proposed and test many types of smart materials, including piezoelectric, shape memory alloys, fiber optics, and electrorheological (ER) and magnetorheological (MR) fluids, to add the required features, such as controllability, and improve the performance for specific applications [9][10][11][12][13][14]. These structures have the capability to adapt their response to external stimuli such as load or environmental changes.…”

Section: Introductionmentioning

confidence: 99%

Impact Analysis of MR-Laminated Composite Structures

Zabihollah¹,

Naji²,

Zareie³

2020

Emerging Trends in Mechatronics

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Laminated composite structures are being used in many applications, including aerospace, automobiles, and civil engineering applications, due to their high stiffness to weight ratio. However, composite structures suffer from low ductility and sufficient flexibility to resist against dynamic, particularly impact loadings. Recently, a new generation of laminated composite structures has been developed in which some layers have been filled fully or partially with magnetorheological (MR) fluids; hereafter we call them MR-laminated structures. The present article investigates the effects of MR fluid layers on vibration characteristics and specifically on impact loadings of the laminated composite beams. Experimental works have been conducted to study the dynamic performance of the MR-laminated beams.

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“…However, some MREAs are generally used infrequently in impact mitigation applications. Such examples might be seismic dampers for earthquake mitigation system (Jiang and Christenson, 2012; Yang et al, 2002), energy absorbers for sliding seat system (Mao, 2011, Mao et al, 2007) or occupant protection system (Ahamed et al, 2014; Browne et al, 2004; Woo et al, 2007), lag dampers in helicopter (Mikułowski, 2008; Powell et al, 2013; Wereley et al, 2011), and shock absorbers for a gun recoil system (Li and Wang, 2012; Singh and Wereley, 2014). In these cases, the MRF, due to its sedimentation, could not maintain its original particle concentration for the entire period prior to its use (Choi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effective design strategy for a high-viscosity magnetorheological fluid–based energy absorber with multi-stage radial flow mode

Liao

et al. 2018

Journal of Intelligent Material Systems and Structures

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High-viscosity linear polysiloxane-based magnetorheological fluid features its excellent suspension stability. Few reports could be found for magnetorheological energy absorbers using such highly viscous but highly stable magnetorheological fluids as the controlled medium. This study presents a design strategy for the high-viscosity linear polysiloxane-based magnetorheological fluid-based magnetorheological energy absorber with multi-stage radial flow mode. The design strategy is based on the Herschel-Bulkley flow model incorporating minor losses proposed in our prior work. The optimal geometrical parameters were obtained by gradually reducing the number of unknown variables. By analyzing the effect of thicknesses of baffle and outer cylinder and number of coil turns on magnetic circuit, the distribution of magnetic flux in the effective region of magnetorheological valve was optimized. Furthermore, a magnetorheological energy absorber was fabricated and tested using a high-speed drop tower facility with a 600 kg mass. The maximum nominal impact velocity was 4.2 m/s, and the applied current varied discretely from 0, 1, 2, to 3 A. Comparison of our Herschel-Bulkley flow model with measured data was conducted via analysis of peak force, dynamic range, and maximum displacement that indicate the performance of magnetorheological energy absorber. The results validated the effectiveness of the design strategy for the high-viscosity linear polysiloxane-based magnetorheological fluid-based magnetorheological energy absorber.

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Magnetorheological fluid composites synthesized for helicopter landing gear applications

Cited by 45 publications

References 15 publications

A Concentric Design of a Bypass Magnetorheological Fluid Damper with a Serpentine Flux Valve

A Concentric Design of a Bypass Magnetorheological Fluid Damper with a Serpentine Flux Valve

Impact Analysis of MR-Laminated Composite Structures

Effective design strategy for a high-viscosity magnetorheological fluid–based energy absorber with multi-stage radial flow mode

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