Design and testing of a magnetorheological damper to control both vibration and shock loads for a vehicle crew seat

Becnel, Andrew C.; Hu, Wei; Hiemenz, Gregory J.; Wereley, Norman M.

doi:10.1117/12.848724

Cited by 5 publications

(6 citation statements)

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“…Bai et al [15] proposed a biannular-gap MRD with an inner-set permanent magnet to decrease the baseline damper force (i.e., the negative current case for the biannulargap MRD) at high speed while keeping the appropriate dynamic force range for improving shock and vibration mitigation performance. Becnel et al [17] designed and tested an MR damper to control both the shock and loads and vibration for crew seat of an EFV. Their investigation results indicate that the maximum damping force and dynamic range at high velocity can be improved to some extent by changing the dimensions.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

Zheng

Koo

et al. 2014

Advances in Mechanical Engineering

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A novel magnetorheological (MR) damper with a multistage piston and independent input currents is designed and analyzed. The equivalent magnetic circuit model is investigated along with the relation between magnetic induction density in the working gap and input currents of the electromagnetic coils. Finite element method (FEM) is used to analyze the distribution of magnetic field through the MR fluid region. Considering the real situation, coupling equations are presented to analyze the electromagneticthermal-flow coupling problems. Software COMSOL is used to analyze the multiphysics, that is, electromagnetic, thermal dynamic, and fluid mechanic. A measurement index involving total damping force, dynamic range, and induction time needed for magnetic coil is put forward to evaluate the performance of the novel multistage MR damper. The simulation results show that it is promising for applications under high velocity and works better when more electromagnetic coils are applied with input currents separately. Besides, in order to reduce energy consumption, it is recommended to apply more electromagnetic coils with relative low currents based on the analysis of pressure drop along the annular gap.

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Section: Introductionmentioning

confidence: 99%

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

Zheng

Koo

et al. 2014

Advances in Mechanical Engineering

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“…Magnetorheological energy absorbs (MREAs), which combines the simple structure of passive EAs and the adjustable load-stroke profile of active EAs, is an ideal choice for helicopter seat system (Bai et al, 2015; Hiemenz et al, 2007; Ning et al, 2018). Moreover, the successful application of MREAs in other shock mitigation system, such as automobile suspension system (Simon and Ahmadian, 2001), vibration and shock control system (Eem et al, 2019), aerial vehicles (Becnel et al, 2010), and seat suspension (Bai and Yang, 2019a; Choi and Wereley, 2005), make the combination of MREA and helicopter seat system traceable (Mao et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

An improved constant deceleration control method with extended shock velocity range for magnetorheological energy absorber

Feng

Dong

Chen

et al. 2021

Journal of Intelligent Material Systems and Structures

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This paper proposed an extended constant deceleration (ECD) control method that can be used in the shock mitigation system with magnetorheological energy absorbers (MREAs). The ECD control method has three sections: zero controllable force (ZCF) section, constant deceleration (CD) section, and maximum damping force (MDF) section. Under the control of ECD, the system can stop at the end of MREA stroke without exceeding the maximum allowable deceleration. The ECD control algorithm is derived in a single-degree-of-freedom (SDOF) system. The controllable velocity range and the required controllable damping force of ECD control method are also derived, which can provide feasible solutions for the design of shock isolation system with MREAs. The performance of ECD control method is shown by applying to the drop-induced shock mitigation system with different drop velocities, different maximum controllable damping force, and MREA stroke. The results shows that the ECD control method not only has a large controllable velocity range and small controllable damping force requirement, but also can minimize the load transmitted to the system.

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“…Passive energy absorbers (EAs) are used to mitigate vibration, shock, or crash load so as to protect the crew of helicopters (Desjardins, 2006) and expeditionary fighting vehicles (EFVs) (Becnel et al, 2010). However, passive EAs can only be adapted for one specific excitation level/type and one payload weight.…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve the vibration and shock mitigation performance of the isolation systems, magnetorheological energy absorbers (MREAs) would be one of the most appropriate actuators (Wereley et al, 2011) that can be used to adapt the damping force for various excitations and payload weights. Thus, the application of MREAs to the occupant protection systems of ground and aerial vehicles (Becnel et al, 2010;Hiemenz et al, 2007Hiemenz et al, , 2008McManus et al, 2002;Prabakar et al, 2013) has been actively investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Bai et al (2013aBai et al ( , 2013b proposed, designed, and tested an inner-bypass MREA for high-speed applications in ground vehicle suspensions. Becnel et al (2010) designed and tested an MR damper to control both the shock loads and vibration for crew seat of an EFV. Goldasz (2013) theoretically studied an MR damper with multiple fluid flow gaps first introduced by Namuduri et al (2001) and compared its performances with the conventional MR damper with a single fluid flow gap.…”

Section: Introductionmentioning

confidence: 99%

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Magnetorheological energy absorber with dual concentric annular valves

Bai

Wereley

Choi

2015

Journal of Intelligent Material Systems and Structures

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For semi-active shock and vibration mitigation systems using magnetorheological energy absorbers, fail-safe performance is of particular significance if electric power is lost. At the same time, the minimization of the field-off damping force of the magnetorheological energy absorbers at high speed is also important because the damping force due to the viscous damping force at high speed becomes too excessive, and thus, the controllable dynamic range is rapidly reduced. In this article, a fail-safe magnetorheological energy absorber with dual concentric annular valves and an inner-set permanent magnet is proposed to decrease the field-off damping force while keeping an appropriate dynamic range for improving shock and vibration mitigation performance. In the magnetorheological energy absorber, the dual concentric annular valves are configured so as to decrease the baseline damping force, and magnetic activation methods using the electromagnetic coil winding and the permanent magnet are used to maintain appropriate magnetic intensity in these concentric annular valves. An initial field-on damping force is produced by the magnetic field bias generated from the inner-set permanent magnet in consideration of the failure of the electric power supply. The initial field-on damping force of the magnetorheological energy absorbers can be increased (or decreased) by applying positive (or negative) current to the electromagnetic coil winding, and thus, bidirectional controllable damping performance could be realized. After establishing the analytical damping force model of the magnetorheological energy absorber using a Bingham-plastic nonlinear fluid model, its working principle and magnetic properties are analytically validated and analyzed via electromagnetic finite element analysis. The performance of the magnetorheological energy absorber is also theoretically compared with that of a conventional magnetorheological energy absorber with a single valve with the constraint of an identical volume under different excitation velocities.

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Design and testing of a magnetorheological damper to control both vibration and shock loads for a vehicle crew seat

Cited by 5 publications

References 0 publications

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

An improved constant deceleration control method with extended shock velocity range for magnetorheological energy absorber

Magnetorheological energy absorber with dual concentric annular valves

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