Abstract
Powered-two-wheelers (PTWs) are increasingly popular because of their lower cost compared to cars, and therefore the riders’ exposure risk is increasing. Due to their complex dynamics characterized by high non-linearity and inherent instability, PTWs are more difficult to control compared to four-wheeled vehicles. Wobble is a high-frequency instability mode affecting the steering assembly of the PTW, and which often causes the rider to lose control and crash when it occurs. In this paper, we present the design of a new motorcycle semi-active steering damper integrated into the steering column and utilizing a magnetorheological fluid (MRF) for variable damping torque. An analytical model of the concept was first used to perform the preliminary sizing, followed by concept validation using a 3D FE multiphysics magnetic-fluid analysis. The final innovative design offers several advantages compared to traditional steering dampers: (i) a wide range of adjustable damping torque values, with a multiplication factor up to 10 with a maximum electrical current of 2 A; (ii) total integration into the motorcycle steering column enabled by its axial design and limited radius; (iii) a simple chamber geometry that allows for easy manufacture; (iv) longer seal life due to the absence of direct contact between seals and the MRF.
Highlights
Powered-two-wheelers (PTWs)—that is, motorcycles and scooters—continue to increase in popularity throughout Europe, especially in urban areas, accounted for by their lower operating costs and smaller size.As more people choose PTWs as an alternative to cars for individual mobility, the kilometers traveled using this mode of transport are on the rise, together with the increased exposure of riders to the inherent risks
This paper describes the development of abe new design for motorcycle semi-active steering damper subjecting it to a magnetic field
The wobble mode is a dynamic instability state of a motorcycle which consists of a steering
Summary
Powered-two-wheelers (PTWs)—that is, motorcycles and scooters—continue to increase in popularity throughout Europe, especially in urban areas, accounted for by their lower operating costs and smaller size. Studies focused on steering dampers have demonstrated the superior performance of MR fluids for stabilizing the front et al [41] and demonstrated the utility of axiomatic design theory towith analyze the critical end inMonti both motocross street motorcycles [39,40] These authors confirmed real-world tests aspects to aid the design of an innovative architecture for an MRF steering damper fully integrated that the system was able to improve stability when entering a corner or riding over potholes. The viscosity of maximum damping fluid without adversely the riding taskproperties in normal conditions Such a non-Newtonian can be regulatedinfluencing to produce specific damping by subjecting it with proper control, the damping coefficient of the damper can be maximum adjusted seamlessly to a magnetic field. With proper control, the damping coefficient of the damper can be adjusted seamlessly over its operability range
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