Title :
Suppression of burst oscillations in racing motorcycles
Author :
Evangelou, Simos A. ; Limebeer, David J n ; Tomas-Rodriguez, Maria
Author_Institution :
Depts. of Electr. & Electron., & Mech. Eng., Imperial Coll. London, London, UK
Abstract :
Burst oscillations occurring at high speed and under firm acceleration are suppressed with a mechanical steering compensator. Burst instabilities in the subject racing motorcycle are the result of interactions between the wobble and weave modes under high-speed cornering and firm-acceleration conditions. Under accelerating conditions the wobble-mode frequency decreases, while the weave mode frequency increases so that destabilizing interactions occur. The design analysis is based on a time-separation principle, which assumes that bursting occurs on time scales over which speed variations can be neglected. Therefore, under braking and acceleration conditions linear time-invariant models corresponding to constant-speed operation can be utilized in the design process. The inertial influences of braking and acceleration are modelled using d´Alembert-type forces that are applied at the mass centres of each of the model´s constituent bodies. The resulting steering compensator is a simple mechanical network that comprises a conventional steering damper in series with a linear spring. This network is a mechanical lag compensator.
Keywords :
acceleration; braking; design engineering; motorcycles; oscillations; shock absorbers; springs (mechanical); steering systems; vehicle dynamics; acceleration conditions; braking conditions; burst instability; burst oscillation suppression; constant-speed operation; d´Alembert-type forces; design process; firm acceleration; linear spring; linear time-invariant models; mechanical lag compensator; mechanical steering compensator; racing motorcycles; steering damper; time-separation principle; weave mode frequency; wobble mode frequency; Acceleration; Damping; Motorcycles; Oscillators; Shock absorbers; Tires; Weaving;
Conference_Titel :
Decision and Control (CDC), 2010 49th IEEE Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-7745-6
DOI :
10.1109/CDC.2010.5717690