Shock load mitigation using magnetorheological energy absorber with bifold valves

Mao, Min; Hu, Wei; Wereley, Norman M.; Browne, Alan L.; Ulicny, John C.

doi:10.1117/12.714132

Cited by 11 publications

(13 citation statements)

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“…Each coil was energized, from Coil IV to Coil I in sequence, with time interval 10 ms. It can be found that the damping force is the function of the velocity as well as the input current, which is in accordance with general conclusions [23,24]. The total damping force includes viscous damping force and field-dependent damping force, which change with the velocity and current respectively.…”

Section: Methodssupporting

confidence: 87%

Controllability analysis and testing of a novel magnetorheological absorber for field gun recoil mitigation

Ouyang

Zheng

et al. 2016

Smart Mater. Struct.

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This paper aims to analyze the effects of combined working coils of magnetorheological (MR) absorber on the shock mitigation performance and verify the controllability of MR absorber as applied in the recoil system of a field gun. A physical scale model of the field gun is established and a long-stroke MR recoil absorber with four-stage parallel electromagnetic coils is designed to apply separate current to each stage and generate variable magnetic field distribution in the annular flow channel. Based on dynamic analysis and firing stability conditions of the field gun, ideal recoil force-stroke profiles of MR absorber at different limiting firing angles are obtained. The experimental studies are carried out on an impact test rig under different combinations of current loading: conventional unified control mode, separate control mode and timing control mode. The fullness degree index (FDI) is defined as the quantitative evaluation criterion of the controllability of MR absorber during the whole recoil motion. The results show that the forcestroke profile of the novel MR absorber can approach the ideal curve within 25 degrees of the limiting firing angle through judicious exploitation of the adjustable rheological properties of MR fluid.

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Section: Methodssupporting

confidence: 87%

Controllability analysis and testing of a novel magnetorheological absorber for field gun recoil mitigation

Ouyang

Zheng

et al. 2016

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…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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“…As magnetorheological fluids (MRFs) have controllable properties under externally applied magnetic field [8][9][10][11], the magnetorheological energy absorbers (MREAs) have been a candidate for tunable impact energy absorber applications. The MREAs have the ability to adapt their load-stroke profile to varying impact conditions.…”

Section: Introductionmentioning

confidence: 99%

Impact behavior of a high viscosity magnetorheological fluid-based energy absorber with a radial flow mode

Fu¹,

Liao²,

Li³

et al. 2017

Smart Mater. Struct.

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High viscosity linear polysiloxane magnetorheological fluid (HVLP MRF) was demonstrated with excellent suspension stability. Such material is suitable for application in the magnetorheological energy absorbers (MREAs) under axial impact loading conditions. On this basis, a new energy absorber incorporating a radial valve with high magnetic field utilization and a corrugated tube is proposed. In energy absorption applications where the MREA is rarely if ever used, our MREA takes the ultra-stable HVLP MRF as controlled medium in order for a long-term stability. For MREA performing at very high shear rates where the minor losses are important contributing factors to damping, a nonlinear analytical model, based on the Herschel-Bulkley flow model (HB model), is developed taking into account the effects of minor losses (called HBM model). The HB model parameters are determined by rheological experiments with a commercial shear rheometer. Then, continuity equation and governing differential equation of the HVLP MRF in radial flow are established. Based on the HB model, the expressions of radial velocity distribution are deduced. The influences of minor losses on pressure drop are analyzed with mean fluid velocities. Further, mechanical behavior of the corrugated tube is investigated via drop test. In order to verify the theoretical methodology, a MREA is fabricated and tested using a high-speed drop tower facility with a 600 kg mass at different drop heights and in various magnetic fields. The experiment results show that the HBM model is capable of well predicting the impact behavior of the proposed MREA.

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Shock load mitigation using magnetorheological energy absorber with bifold valves

Cited by 11 publications

References 0 publications

Controllability analysis and testing of a novel magnetorheological absorber for field gun recoil mitigation

Controllability analysis and testing of a novel magnetorheological absorber for field gun recoil mitigation

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

Impact behavior of a high viscosity magnetorheological fluid-based energy absorber with a radial flow mode

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