One-way coupled numerical model utilizing Viscoelastic Maxwell model for MR damper

The beneﬁts of giant electrorheological ﬂuids (GER ﬂuids) have been harnessed to enhance their eﬀect in damping force generation. However, few results have been reported on the issue of taking advantage of a helical duct ﬂow in improving the performance of a GER-based damper in generating and tuning damping eﬀects. In this study, an innovative GER ﬂuid-based damper with helical ﬂow ducts is proposed. The proposed ﬂow mode can achieve a greater pressure gradient during operation, and, thus, improve the damping performance by enlargement of the length of the active region with more compact dimensions. A mathematical model aiming to explain the mechanical properties of the damper is investigated based on the continuity equation and Navier–Stokes equations. Then, simulation studies based on computational ﬂuid dynamics (CFD) solvers are conducted to verify the eﬀectiveness of the mathematical model. Additionally, an experimental prototype of the GER ﬂuid damper is fabricated, and damping force measurements under diﬀerent excitations are carried out. The experimental results agree well with the results obtained from theoretical analysis and CFD solvers. The regulation coeﬃcient that illustrates the tunable range of the damping force is found to reach a value of 8 times under an electric ﬁeld ranging from 0 to 1 kV/mm.

Section: Numerical Simulationmentioning

confidence: 99%

Numerical and experimental study of a novel GER fluid damper based on helical duct flow

Zhao¹,

Cao²,

Jing³

et al. 2022

“…With the evolution of micro-technology, some scholars have begun to explore the micro-phenomena of magnetorheological fluid (MRF), revealing the relationship between chain structure and yield stress [27][28][29][30], and establishing dynamic models to describe hysteresis characteristics. Pei et al [31] employed a particle-level simulation method to probe the micro-structured behavior and rheological properties of MRF, and developed the constitutive model.…”

Section: Introductionmentioning

confidence: 99%

A forward-inverse dynamic model for the hydraulic damping(magnetorheological) actuator based on cyclic stress–strain

Ma,

Huang,

Huang

et al. 2024

Magnetorheological dampers (MRDs) are applied to hydraulic systems, which not only improve the underdamped characteristics of valve-controlled cylinder systems, but also help hydraulic actuators to resist high load impact. However, the high power density leads to the complexity of the internal flow channel of the damper, which seriously affects the output accuracy of the damping force. It can lead to the fact that existing dynamics models cannot accurately describe the hysteresis characteristics of the MRD. Therefore, this study proposes a simple and general dynamic model of MRD, which solves the problem that existing models are complex and difficult to invert. Firstly, the hydraulic damping actuator (HDA) with the series MRD is taken as the research object. Based on the stress-strain hysteresis characteristics under the cyclic constitutive model, the hyperbolic tangent curve is reorganized and normalized. It can accurately describe the yield formation and yield dissipation stages of the hysteresis loop. Secondly, the relationship between the parameters of the dynamic model and the current is obtained according to the mechanical experimental data. Then the inverse model of the MRD is established by using the method of section-backstepping. Finally, in the static experiment, the Mean Absolute Percentage Error(MAPE) of the force at different velocity is less than 7.5%; In the dynamic experimental test, the MAPE of the force is 9.7%. The inverse dynamics model is verified to have high tracking performance under both static and dynamic forces. And it also indirectly confirms the effectiveness of the forward model.

“…Liao et al [36] utilized the Erving model to describe the rheological characteristics of MRF, providing a continuous description of the changes of MRF rheological characteristics. The Herschel-Bulkley (HB) model [27,[37][38][39], introducing the thickening-index, solved the issue that the MRF motion viscosity decreases at high shear rate, unexplained by many models, but it could not fully consider the Newtonian fluid characteristics of MRF at low shear rates, and there were limitations in characterizing the hysteresis phenomenon in the low-velocity working stage of MRDs. Although these parametric models demonstrated the certain accuracy, they had certain limitations when used to explain the complete working stage of MRDs.…”

Section: Introductionmentioning

confidence: 99%

Dual-stage theoretical model of magnetorheological dampers and experimental verification

Lei,

Li,

Zhou

et al. 2024

The theoretical model for predicting the damping characteristics of magnetorheological dampers (MRDs) not only facilitates the optimization of MRD parameters, but also provides assistance for the theoretical design of MRDs. However, some existing models have limitations in fully characterizing the damping characteristics of MRDs. In this paper, the workingstageof MRDs was categorized into yield and pre-yield stages based on whether the internal magnetorheological fluid (MRF) attains the dynamic shear yield state or not, and the Herschel-Bulkley model with pre-yield viscosity(HBPV) and improved polynomial model (IPOL) were employed to respectively characterize the yield and pre-yield stages of MRDs. Subsequently, the HBPV-IPOL model was proposed to characterize the complete damping characteristics of MRDs in low-frequency vibration conditions, with considering the local loss effect of the fluid in the model. To accurately characterize the magnetic induction intensity in the MRD damping channel, employing the steady-state finite element method (FEM) for magnetic field analysis; on this basis, dividing the damping channel to investigate the variation trends of the magnetic induction intensity in different regions. Simultaneously, the zero-field region hypothesis was proposed to quantitatively consider the influence of minute magnetic induction intensity in the traditional zero-field regions on the damping characteristics of MRDs. Finally, integrating the impact trends of currents in different regions, and employing the HBPV model to determine the impact magnitude of each region within the damping channel on the damping characteristics of the MRD in the yield stage. In the pre-yield stage, Polynomial curves were fitted to experimental damping force-velocity curves, and the obtained polynomials were employed to predict the damping characteristics. Extensive experiments have been conducted on MRD samples to assess the predictive performance of the model on MRD damping characteristics under sinusoidal displacement excitation vibration conditions with different excitation currents, vibration frequencies and vibration amplitudes.