Usage of magneto-active elastomers in a bumper of a vehicle for front impact protection

Богданов, В. В.; Borin, Dmitry; Степанов, Г. В.; Andruszkiewicz, A.

doi:10.1088/1742-6596/149/1/012089

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…MAE materials have been used in a variety of applications such as car bumper design to maximize energy absorption in a collision (Bogdanov et al, 2009) and self-locomotion (Von Lockette and Sheridan, 2013). These elastomers have also been used to reduce noise vibration as part of a barrier system (Farshad and Le Roux, 2004).…”

Section: Introductionmentioning

confidence: 99%

Bistable compliant mechanism using magneto active elastomer actuation

Crivaro

Sheridan

Frecker

et al. 2016

Journal of Intelligent Material Systems and Structures

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One of the challenges in the emerging field of origami engineering is achieving large deformations to enable significant shape transformations. Bistable compliant mechanisms provide a means to achieve this, and the goal of this research is to investigate the feasibility and design of a compliant bistable mechanism that is actuated by magneto active elastomer material. When exposed to an external field, magneto active elastomer material deforms to align embedded magnetic particles with the field. We investigate a case study using magneto active elastomer actuation through the development of finite element analysis models to predict the magnetic field required to snap the device from its first stable position to its second for various geometries and field strengths. The finite element analysis model also predicts the displacement of the mechanism as it moves from one position to the other to determine whether the device is in fact bistable. These results can be used to understand the relationship between the substrate properties and the bistability of the device. The experimental results validate the finite element analysis models and demonstrate the functionality of active magneto active elastomer materials to be used as actuators for such devices and applications of origami engineering.

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Section: Introductionmentioning

confidence: 99%

Bistable compliant mechanism using magneto active elastomer actuation

Crivaro

Sheridan

Frecker

et al. 2016

Journal of Intelligent Material Systems and Structures

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“…Responding to needs for load bearing, faster responses, and compact tension actuators, magnetorheological elastomers (MREs) were developed. They are used in many macroscopic (prosthetics [31], responsive vehicle seat suspensions [32][33][34], engine mounts [35,36], adaptive tuned vibration absorbers [37][38][39][40][41][42][43][44][45], smart variable stiffness and damping isolators [46,47], vibratory pile hammers [48], smart vehicle bumpers [49], noise barrier systems [50], MRE valve [51], and MRE bearings [52][53][54][55]) as well as in microscopic applications (variable impedance surfaces [56], micro cantilevers [57], smart composites [58][59][60], sensors [61][62][63], touch-screen panel [64], flexible controllable micro-pump [65,66], magnetometers [67], and artificial lymphatic vessels [68]). They are especially suited to shifting the vibration of structures away from harmful resonance frequencies [69][70][71].…”

mentioning

confidence: 99%

A novel phenomenological model for dynamic behavior of magnetorheological elastomers in tension–compression mode

Vatandoost

Norouzi

Alehashem

et al. 2017

Smart Mater. Struct.

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Tension-compression operation in MR elastomers (MREs) offers both the most compact design and superior stiffness in many vertical load-bearing applications such as MRE bearing isolators in bridges and buildings, suspension systems and engine mounts in cars, and vibration control equipment. It suffers, however, from lack of good computational models to predict device performance, and as a result shear-mode MREs are widely used in the industry, despite their low stiffness and load-bearing capacity. We start with a comprehensive review of MREs modeling and their dynamic characteristics, showing previous studies have mostly focused on dynamic behavior of MRE in the shear mode, though the MRE strength and MR effect are greatly decreased at high strain amplitudes, due to increasing distance between the magnetic particles. Moreover, the characteristic parameters of the current models either frequency, strain or magnetic field are constant; hence, new model parameters must be recalculated for new loading conditions. This is an experimentally time consuming and computationally expensive task, and no models capture the full dynamic behavior of the MREs at all loading conditions. In this study, we present an experimental setup to test MREs in a coupled tension-compression mode, as well as a novel phenomenological model which fully predicts the stress-strain behavior of the as a function of magnetic flux density, loading frequency and strain. We use a training set of experiments to find the experimentally derived model parameters, which can predict by interpolation the MRE behavior in the relatively large continuous range of frequency, strain and magnetic field. We also challenge the model to make extrapolating predictions and compare to additional experiments outside the training experimental data set with good agreement. Further development of this model would allow design and control of engineering structures equipped with tension-compression MREs and all the advantages they offer.

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“…Considering that point, researchers suggested the implementation of a magnetorheological (MR) damper as a solution for a controllable bumper to improve vehicle crash mitigation behavior. 1,2 The magnetorheological (MR) damper characteristics were discussed and suggested as a controllable damping system integrated in the front-end structure. Alongside, the MR fluid's ability to change its characteristics in few milliseconds due to the change of the magnetic field affecting it.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vehicle body pitch control through integration of MR damping system implemented in both vehicle suspension and front-end structure

Fekry

Oraby

Ali

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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The current research work is directed to study and improve vehicle behavior during crashes. Hence, a crash-pitch controller integrated with Magneto-Rheological (MR) dampers implemented in both vehicle suspension system and front-end structure is designed and studied. The methodology of the work is based on modeling the vehicle dynamical attitude as a half-car mathematical model that is developed with 3 degrees of freedom (DOF), longitudinal, bounce, and pitch. The model is constructed to study the vehicle’s dynamic response in a full-frontal collision against a fixed barrier. Additionally, a fuzzy logic controller is developed to integrate the suspension MR dampers with another set of MR dampers implemented within the vehicle’s front-end structure. Four different vehicle cases were discussed and compared within the simulation results of the developed model. Moreover, the four mentioned cases can be clarified as first free-rolling, second replacing the vehicle’s conventional dampers with MR dampers, third implemented MR dampers within the vehicle’s front-end structure, finally the fourth case through the integration of MR dampers implemented within both front-end structure and suspension system. Hence, the fourth case was implemented through the augmentation of simultaneous crash-pitch controllers. The simulation results showed a noticeable improvement in the front-end structure deformation as it had been reduced. Moreover, the vehicle’s body attitudes had also been improved where pitch angle had been reduced as well as its settling time. Also, pitch acceleration had been reduced which benefits human body exposure.

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Usage of magneto-active elastomers in a bumper of a vehicle for front impact protection

Cited by 9 publications

References 9 publications

Bistable compliant mechanism using magneto active elastomer actuation

Bistable compliant mechanism using magneto active elastomer actuation

A novel phenomenological model for dynamic behavior of magnetorheological elastomers in tension–compression mode

Vehicle body pitch control through integration of MR damping system implemented in both vehicle suspension and front-end structure

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