Abstract
The aim of this paper is to investigate the limits of the quasi-static, no-slip approach when modeling the activation of magnetorheological (MR) devices. A quasi-static model is implemented to define the hydraulic and magnetic characteristics of an MR damper prototype. Then, an FE (Finite Element) magnetic simulation activity is carried out to validate theoretical findings, and an optimization procedure is carried out to adjust nominal geometry to actual application. Furthermore, a prototype is realized re-using the maximum number of components that constitute the existing conventional shock absorber. Finally, experimental tests at bench stands are performed. The predictable results demonstrate that neglecting the transient slipping effects, the Force–Velocity performance of the device is correlated with the model findings only for low current intensities acting in the magnetic circuit.
Highlights
In a motorcycle, the suspensions are the set of parts that connect the sprung and unsprung masses, allowing relative motion
A conventional shock absorber is composed of a spring and a central body that is designed as a hydraulic circuit to ensure a certain damping effect; the dynamic driving behavior can be customized by adjusting the fluid passage sections when the vehicle is stationary
Using traditional hydraulic shock absorbers, a compromise choice must be found between comfort and safety needs; comfort riding often requires a plush, underdamped shock absorbers setting, while the search for grip and traction mostly suggests overdamped characteristics
Summary
The suspensions are the set of parts that connect the sprung and unsprung masses, allowing relative motion. The unsprung masses are all those elements connected to the ground—tires, rims, the brake system, and the parts of the suspension integral with them. The role of the suspension system is crucial in the vehicle design, as it performs different tasks, and its performance requirements are often conflicting: it guarantees the contact between the vehicle tires and road while isolating the vehicle body from the vibrations due to the road roughness [2]. When setting the suspension of a vehicle, it is necessary to satisfy different requirements such as driving comfort and good tire grip [1]. Using traditional hydraulic shock absorbers, a compromise choice must be found between comfort and safety needs; comfort riding often requires a plush, underdamped shock absorbers setting, while the search for grip and traction mostly suggests overdamped characteristics
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