Suppression of multiple order friction torque fluctuations with modulated actuation pressure

Osman Taha Sen, Jason T. Dreyer, Rajendra Singh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


The goal of this article is to examine the effect of modulated actuation pressure on the friction torque response of a disc brake system. First, a dynamic friction experiment, consisting of a flywheel, shaft and brake assembly, is built and instrumented accordingly. The actuation pressure is modulated with a solenoid valve located in the hydraulic line. During the experiment, the modulation frequency is kept intact, and the shaft torque is measured as the system slows down; an amplification of the dynamic torque is observed as the system passes through the resonance. Second, a nonlinear mathematical model of the brake experiment is developed, and the dynamic torque response is numerically calculated for various modulation schemes, such as with constant frequency and sweeping modulation frequency with single harmonic content. Predicted results are compared with measurements. Finally, the outcome of this study is related to the brake judder problem, and some solutions for the reduction of dynamic torque are briefly discussed.

Original languageEnglish
Title of host publicationNonlinear Dynamics - Proceedings of the 32nd IMAC, A Conference and Exposition on Structural Dynamics, 2014
PublisherSpringer New York LLC
Number of pages8
ISBN (Print)9783319045214
Publication statusPublished - 2014
Event32nd IMAC Conference and Exposition on Structural Dynamics, 2014 - Orlando, FL, United States
Duration: 3 Feb 20146 Feb 2014

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Conference32nd IMAC Conference and Exposition on Structural Dynamics, 2014
Country/TerritoryUnited States
CityOrlando, FL


We acknowledge the Smart Vehicle Concepts Center ( ) and the National Science Foundation Industry/University Cooperative Research Centers program ( ) for supporting this fundamental study.

FundersFunder number
National Science Foundation
National Science Foundation Industry
University Cooperative Research Centers program


    • Brake judder
    • Experimental dynamics
    • Friction-induced vibration
    • Modulated actuation pressure
    • Transient vibration


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