Performance tests and microstructure‐based sigmoid model for a three‐coil magnetorheological damper

Abstract

Magnetorheological (MR) damper is one of the most promising smart devices for dissipating seismic energy and reducing structural vibrations. The MR dampers with multiple coils are widely adopted to enhance the output damping forces and seismic performance. In order to study the dynamic characteristics of multicoil MR dampers from a micro to macro viewpoint, a three-coil MR damper was designed and manufactured in this paper. The performance tests of the three-coil MR damper under different excitation currents, displacement amplitudes, frequencies, and coil combinations were conducted.Assuming that the distance between two adjacent ferromagnetic particles meets chi-square distribution, the two-column micromodel for the MR fluid was modified by introducing a distribution parameter. The modified MR fluid micromodel was verified by comparing the damping forces calculated by this model with experimental data. Combining the modified micromodel for the MR fluid and the double-sigmoid model for MR dampers, a mathematical model for the three-coil MR damper was proposed. The microstructure-based sigmoid model considers the effects of yield shear stress of the MR fluid and internal magnetic induction intensity on the damping force. The comparison of the proposed model and the performance test data shows that the microstructure-based sigmoid model can finely describe the dynamic characteristics and magnetic saturation properties of the three-coil MR damper under different excitation currents and loading conditions, which provides a good basis for control strategies and dynamic analysis of structures with multicoil MR dampers. K E Y W O R D S microstructure-based sigmoid model, model verification, modified micromodel, performance tests, three-coil magnetorheological damper 1 | INTRODUCTIONMagnetorheological (MR) fluid is a typical intelligent material, which is a suspension formed by the distribution of magnetic particles in micron or nanometer size in a carrier liquid. It mainly contains magnetic particles, carrier liquid, and various additives. The most significant feature of the MR fluid is its magnetorheological effect; that is, the magnetic particles in the MR fluid can be transformed from a random disordered state to ordered chain or columnar structure in

Design and experimental research of stepped bypass magnetorheological damper

“…In the structural design of magnetorheological dampers, the advantages of bypassed magnetorheological dampers are higher shear stress, good damping force adjustability and the possibility of higher maximum damping force generated (Aziz and Aminossadati, 2021). For the design of magnetorheological damper coils, some researchers study the magnetorheological damper with three coils and propose a mathematical model applicable to the magnetorheological damper with three coils, which provides information for the design and analysis of future magnetorheological dampers with multiple coils (Yang et al, 2021). For the optimization of magnetorheological dampers, the researchers used multi-objective optimization design to optimize the structure and used the most reasonable parameters in each parameter to improve the performance of the magnetorheological dampers (Huina et al, 2021; Jiang et al, 2022a).…”

Experimental and numerical study of the forward and inverse models of an MR gel damper using a GA-optimized neural network

“…Both parametric and non-parametric models have been proposed to describe the behavior of MR dampers (Bui et al, 2021; Wang and Liao, 2011; Xu et al, 2021; Yang et al, 2013; Zamani et al, 2019). Parametric models based on mechanical idealizations have been studied by several researchers (Yang et al, 2021; Zhang et al, 2021). However, these parametric models can model the dynamics of MR dampers within a limited range and the simulation accuracy depends not only on the dynamic model but also the parametric identification method.…”

Performance tests and design of a series of magnetic fluid shock absorbers with varying stiffness based on optimal stiffness formula

“…Meanwhile MRFs possess stronger shear viscosity and yield stress than MFs. Based on these interesting characteristics of MRFs, they are usually used for vibration suppression of medium or high frequencies (Xu et al, 2021;Yang et al, 2021).…”