Topic
Magnetorheological fluid
About: Magnetorheological fluid is a research topic. Over the lifetime, 8538 publications have been published within this topic receiving 131502 citations. The topic is also known as: MRF & MR fluid.
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TL;DR: In this article, a theoretical model of magnetically induced normal and shear forces acting on the abrasive is also proposed in the ball end magnetorheological finishing (BEMRF) process.
62 citations
TL;DR: In this paper, an optimized modified skyhook control for the semi-active Macpherson suspension system, equipped with a magnetorheological (MR) damper, is investigated using H∞ robust control theory and a 2-D dynamic model, including the kinematics of the suspension system.
Abstract: In this paper, an optimized modified skyhook control for the semiactive Macpherson suspension system, equipped with a magnetorheological (MR) damper, is investigated. Using H∞ robust control theory and a 2-D dynamic model, including the kinematics of the suspension system, a robust output feedback controller is developed. The combination of a linear matrix inequality (LMI) solver and genetic algorithm (GA) is adopted to optimize the control gains. Further a 3-D kinematic model is introduced to evaluate the kinematic performance of the controlled suspension system. An inverse dynamic model of the MR damper is obtained based on the experimental results for tuning the input current signal. The effectiveness of the control system is discussed and validated through the simulations and experiment.
61 citations
TL;DR: In this paper, the performance of three semi-active control algorithms for use with multiple magnetorheological (MR) dampers is compared in terms of reduction in the maximum interstory drifts, displacements, absolute accelerations, and control forces.
Abstract: This paper presents comparisons of the performances of three semiactive control algorithms for use with multiple magnetorheological (MR) dampers. The three controllers are (1) the clipped-optimal controller, (2) the decentralized output feedback polynomial controller, and (3) the simple passive controller. These controllers use different types of inputs to calculate control signals for the MR dampers, based on different control mechanisms. To investigate the advantages of each controller, a three-degree-of-freedom steel moment-resisting frame, designed using a performance-based design methodology, was developed. The performance was investigated by using four different earthquakes utilized during the design of the building frame. Comparisons of the controllers’ performance were carried out in terms of reduction in the maximum interstory drifts, displacements, absolute accelerations, and control forces. Real-time hybrid tests were carried out to validate these comparisons.
61 citations
TL;DR: In this paper, the authors proposed a meandering pattern formed by multiple annular and radial gaps in order to extend the flow path length of magnetorheological fluid, which is important to increase the density of effective area.
Abstract: A novel concept of a compact magnetorheological valve is proposed based on the advance characteristics of magnetorheological fluid. The structural design consists of a meandering pattern formed by multiple annular and radial gaps in order to extend the flow path length of magnetorheological fluid. Extending the flow path of magnetorheological fluid is important in order to increase the density of effective area, so that the rheological properties of magnetorheological fluid can be widely regulated in a small size magnetorheological valve. The main objective of this article is to show that the pressure drop as one of the key performance indicators in a magnetorheological valve can be significantly increased using multiple annular and radial gaps configuration. In order to demonstrate the magnetorheological valve performance, simulation work using magnetic simulation software called finite element method-based software for magnetic simulation is conducted and combined with the pressure drop calculation using the derived magnetorheological valve model. Simulation results show that the magnetorheological valve with multiple annular and radial gaps is able to improve the achievable pressure drop. The discussion on the effect of gap size variations on the achievable pressure drop and the operational range of magnetorheological valve is also presented.
61 citations
TL;DR: In this article, a detailed investigation of the nonlinear rheological properties of magnetorheological (MR) gels under large amplitude oscillatory shear flow was carried out, and a strong Payne effect was observed for strains above 0.05% which is the limit of linear viscoelastic region.
61 citations