Abstract
A magnetorheological (MR) damper is one of the most advanced devices used in a semiactive control system to mitigate unwanted vibration because the damping force can be controlled by changing the viscosity of the internal magnetorheological (MR) fluids. This study proposes a typical double coil MR damper where the damping force and dynamic range were derived from a quasistatic model based on the Bingham model of MR fluid. A finite element model was built to study the performance of this double coil MR damper by investigating seven different piston configurations, including the numbers and shapes of their chamfered ends. The objective function of an optimization problem was proposed and then an optimization procedure was constructed using the ANSYS parametric design language (APDL) to obtain the optimal damping performance of a double coil MR damper. Furthermore, experimental tests were also carried out, and the effects of the same direction and reverse direction of the currents on the damping forces were also analyzed. The relevant results of this analysis can easily be extended to the design of other types of MR dampers.
Highlights
The rheological properties of a magnetorheological fluid (MRF) can be continuously changed within several milliseconds by applying or removing external magnetic fields
The MR dampers have a huge applications in automotive industry including off-road vehicles [5,6,7], and they are widely used in naval gun controlling [8, 9], field of landing gear [10, 11], prosthetic knees [12, 13], washing machines [14], high speed train suspension [15,16,17], seismic vibration control of different civil structures [18,19,20], and so on
As well known that the performance of MR dampers significantly depended on the activating magnetic circuit, the performance of MR dampers can be optimized by the optimal design of the activating magnetic circuit
Summary
The rheological properties of a magnetorheological fluid (MRF) can be continuously changed within several milliseconds by applying or removing external magnetic fields. Parlak et al [28] investigated the geometrical optimization of an MR shock damper using the Taguchi experimental design approach by specifying four parameters (gap, flange thickness, radius of piston core, and current excitation) and by selecting the maximum dynamic range required as the target value. Though the magnetic optimal design methods can decrease the cost and the manufacturing period and improve the performance of the MR dampers, many factors are needed to consider in developing MR dampers to obtain optimal designs, that is, how to find significant geometrical dimensions and configurations of MR dampers to obtain maximum output mechanical performance, such as damping force or dynamic range, which makes the problem very challenging when using conventional optimization methods. A series of dynamic experimental tests, especially the effects of the same direction and reverse direction of the currents on the damping forces, were carried out
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