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Dynamic analysis of dry friction path in a torsional system

Duan, Chengwu
http://rave.ohiolink.edu/etdc/view?acc_num=osu1092672620

Abstract Details

2004, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
Traditionally, dry friction non-linear elements have been treated as vibration dampers, in parallel with elastic elements. However, in some practical systems (including automotive drivelines) the dry friction element (with high saturation torque) exists by itself and it functions as a key power transmission path for both mean and dynamic loads. First, to address such path issues, we examine multi-degree of freedom torsional systems with time-invariant normal load. A procedure to predict pure stick to stick-slip boundaries, based on a linear system theory, is developed when the torsional system is excited by harmonic excitation. For non-linear studies, both discontinuous and smoothened friction formulations are examined. The effects of a secondary inertia are analytically and numerically investigated. Results show that the secondary mass significantly affects the quasi-discontinuous nature of the system response. Next, in order to fully understand the non-linear frequency characteristics generated by stick-slip vibration, a new analytical method is developed based on assumed torque and velocity profiles. Super-harmonics are efficiently calculated and effect of the mean torque is qualitatively identified. Further, a refined multi-term harmonic balance proposed and associated computational issues are addressed. Studies show that the mean load significantly affects the response as it could induce asymmetric stick-slip motions. Second, the effect of time varying actuation pressure (or the normal load) on the dry friction element on transient and steady state responses has been studied. Analytical solution for pure slip motion is obtained based on an approximate linear system model. Effects of time-varying parameters, such as phase, frequency and amplitude of the actuation pressure are observed over several frequency regimes. The negative friction slope is found to be the major cause of judder-induced phenomena such as bifurcations and quasi-periodic or chaotic responses. Some instabilities such as abrupt jumps in the amplitude-frequency maps of relative velocity are also seen around the super-harmonic peak frequencies.
Rajendra Singh (Advisor)
225 p.
Engineering, Mechanical
Dry Friction Path; Torsional System; Non-linear Vibration; Automotive Drivetrain

Recommended Citations

Citations

  • Duan, C. (2004). Dynamic analysis of dry friction path in a torsional system [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1092672620

    APA Style (7th edition)

  • Duan, Chengwu. Dynamic analysis of dry friction path in a torsional system. 2004. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1092672620.

    MLA Style (8th edition)

  • Duan, Chengwu. "Dynamic analysis of dry friction path in a torsional system." Doctoral dissertation, Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1092672620

    Chicago Manual of Style (17th edition)

osu1092672620
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© 2004, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.