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Nonlinear dynamics of one-way clutches and dry friction tensioners in belt-pulley systems

Zhu, Farong
http://rave.ohiolink.edu/etdc/view?acc_num=osu1158689667

Abstract Details

2006, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
Serpentine belts are widely used for efficient power transmission in automobiles and heavy vehicles, but they suffer noise and wear problems that have their roots in system vibration. The primary goal of this work is to develop mathematical models for serpentine drives with nonlinear elements and implement vibration analysis to understand certain nonlinear dynamic behaviors and provide guidance for practical design. Nonlinear one-way clutches integrated with accessory pulleys are effective devices to decouple the motions of an accessory and its pulley during disengagements and mitigate the rotational pulley vibration problems. A mathematical model of a one-way clutch in belt-pulley systems is established, where a wrap-spring type of clutch is modeled as a nonlinear spring with discontinuous stiffness. Analysis of steady state and transient vibrations exhibits the mechanisms behind one-way clutches’ effectiveness, and identifies where the one-way clutch works most effectively to reduce vibration and noise. The method of multiple scales is employed to approximate the steady-state periodic solutions. This study evaluates the validity of the perturbation method for such strong nonlinearity through comparison of analytical and numerical solutions. A one-way clutch that functions based on the relative velocity of the driven pulley and its accessory is common in applications. This type of one-way clutch is included in a hybrid continuum-discrete model incorporating span vibration and pulley rotation. The engagement/disengagement status transitions lead to a piece-wise linear system with alternate locked clutch and disengaged clutch configurations. The dynamic response and dynamic tension fluctuations are examined for varying system parameters. A tensioning system, consisting of a rigid arm pivoting around a fixed point and an idler pulley rotating at the free end of the arm, is typically used in belt drives to maintain belt tension as operating conditions change. Dry friction is deliberately introduced at the tensioner arm pivot to control the arm movement. The interest of this work lies in the influence of dry friction tensioner on the dynamics of the belt drives incorporating belt bending stiffness, such as how to adjust the Coulomb torque at the tensioner arm pivot to mitigate the system vibration and reduce the span tension fluctuation.
Robert Parker (Advisor)
170 p.
Engineering, Mechanical
Tensioner; Dry friction; Harmonic balance method; Arc-length continuation; Piece-wise linear system; Belt-pulley system; Serpentine belt; Front end accessory drive; Perturbation analysis; Nonlinear dynamics; Softening nonlinearity; Dynamic analysis

Recommended Citations

Citations

  • Zhu, F. (2006). Nonlinear dynamics of one-way clutches and dry friction tensioners in belt-pulley systems [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1158689667

    APA Style (7th edition)

  • Zhu, Farong. Nonlinear dynamics of one-way clutches and dry friction tensioners in belt-pulley systems. 2006. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1158689667.

    MLA Style (8th edition)

  • Zhu, Farong. "Nonlinear dynamics of one-way clutches and dry friction tensioners in belt-pulley systems." Doctoral dissertation, Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1158689667

    Chicago Manual of Style (17th edition)

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© 2006, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.