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TECHNICAL PAPERS

Nonlinear Dynamic Behavior of a Motorcycle’s Forecarriage During Braking

[+] Author and Article Information
F. Braghin

Department of Mechanical Engineering, Politecnico di Milano, 20156 Milan, ItalyFrancesco.braghin@polimi.it

M. Brembilla

Department of Mechanical Engineering, Politecnico di Milano, 20156 Milan, Italymaurobrembilla@overdev.com

G. Brambilla

 Brembo S.p.A., Stezzano BG, Italyguido_brambilla@brembo.it

M. Pezzola

Department of Mechanical Engineering, Politecnico di Milano, 20156 Milan, Italymarco.pezzola@polimi.it

J. Dyn. Sys., Meas., Control 129(6), 837-844 (Jul 20, 2006) (8 pages) doi:10.1115/1.2745841 History: Received May 20, 2005; Revised July 20, 2006

An experimental and numerical experience was carried out to investigate the nonlinear dynamic response of the forecarriage of a motorcycle, paying attention to a particular type of vibration that occurs during the braking. In fact, it was found that, in particular conditions of load on the handlebar, braking pressure, speed and temperature, the first flexural mode of the front fork is strongly excited. Thanks to the numerical model, solutions to these undesired vibrations were identified. Experimental tests were carried out modifying the design parameters of the motorcycles and of the braking system as suggested by the numerical model thus verifying that the purposed solutions were effective.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Scheme of the motorcycle

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Figure 2

Scheme of the forecarriage

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Figure 3

Scheme of the front wheel

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Figure 4

Time histories of the fork’s longitudinal acceleration, left caliper pressure, and front wheel speed

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Figure 5

Time histories of the front brake lever, temperatures, lever acceleration, fork stroke, and front wheel speed

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Figure 6

Zoom of the caliper pressures and pump pressure

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Figure 7

Longitudinal acceleration on the fork’s terminal; comparison between model’s output and experimental data in terms of frequency response

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Figure 8

Lever movement: comparison between the model’s output and experimental data in terms of frequency response

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Figure 9

Lever movement: nominal and induced

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Figure 10

Fork’s stroke and vehicle’ speed: comparison between model’s output and experimental data

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Figure 11

Pressure: model’s output

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Figure 12

Brake lever movement: model’s output

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Figure 13

Acceleration of the fork’s terminal: comparison between model’s output and experimental data

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Figure 14

D.O.F. model’s output

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Figure 15

Forces: model’s output

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Figure 16

Acceleration on the brake lever: frequency response

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Figure 17

Acceleration on the brake lever: time history

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Figure 18

Acceleration on the handlebar: time history and spectral analysis

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