Abstract
This study proposes the relationship between the ride comfort of passenger vehicles and two different types of magnetorheological (MR) dampers: with and without orifice holes in the piston. To achieve this, two cylindrical-type MR dampers with identical dimensions such as the radius of piston, pole lengths, and the distance between two poles are proposed. One of the MR dampers adds the orifice holes in the piston bobbin to obtain a relatively low damping force slope in low piston velocity region. In order to enhance the ride quality of passenger vehicle, the damping force slope of rear damper should be more gradual than that of front damper. So, it can be inferred that identical semi-active vehicle systems require normal MR dampers in the front and MR dampers with orifice holes in the rear with proper control strategies. To evaluate the ride performance, a robust sliding mode controller is designed. It is demonstrated through a simulation that the proposed vehicle system produces better ride comfort than vehicle systems equipped with only one type of MR damper.
Highlights
Magnetorheological (MR) fluid is considered a smart material because its rheological properties can be controlled by the application of magnetic fields
The MR suspension system should be installed on an actual vehicle and its effectiveness for ride comfort should be evaluated under various road conditions
The ride comfort of passenger vehicles equipped with different combinations of front/rear suspension systems featuring two different types of MR dampers, with and without orifice holes, were compared
Summary
Magnetorheological (MR) fluid is considered a smart material because its rheological properties can be controlled by the application of magnetic fields. The yield shear stress of MR fluid is controlled by the intensity of the magnetic field Owing to this salient feature, numerous studies have been conducted on the development of new application devices and systems using this material, and continuous advancements are being made. The primary design parameters of MR dampers for vehicle suspension applications are: the magnetic gap in which MR fluids flow between the upper and lower chambers, the radius of the piston, and the bobbin structures with coil turns. By appropriately selecting these primary design parameters, successful vibration control performance can be obtained. Active suspension systems of vehicles provide excellent vibration control capability during normal operation
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