NASA Technical Reports Server (NTRS) 19910004424: Non-linear Dynamic Analysis Of Geared Systems. Final Report Ph.D. Thesis - Info and Reading Options
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"NASA Technical Reports Server (NTRS) 19910004424: Non-linear Dynamic Analysis Of Geared Systems. Final Report Ph.D. Thesis" and the language of the book is English.
“NASA Technical Reports Server (NTRS) 19910004424: Non-linear Dynamic Analysis Of Geared Systems. Final Report Ph.D. Thesis” Metadata:
- Title: ➤ NASA Technical Reports Server (NTRS) 19910004424: Non-linear Dynamic Analysis Of Geared Systems. Final Report Ph.D. Thesis
- Author: ➤ NASA Technical Reports Server (NTRS)
- Language: English
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- Internet Archive ID: NASA_NTRS_Archive_19910004424
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"NASA Technical Reports Server (NTRS) 19910004424: Non-linear Dynamic Analysis Of Geared Systems. Final Report Ph.D. Thesis" Description:
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Under driving conditions, a typical geared system may be subjected to large dynamic loads. Also, the vibration level of the geared system is directly related to the noise radiated from the gear box. The steady state dynamic behavior of the system is examined in order to design reliable and quiet transmissions. The scope is limited to a system containing a spur gear pair with backlash and periodically time varying mesh stiffness, and rolling element bearings with clearance type nonlinearities. The internal static transmission error at the gear mesh, which is of importance from high frequency noise and vibration control view point, is considered in the formulation in sinusoidal or periodic form. A dynamic finite element model of the linear time invariant (LTI) system is developed. Effects of several system parameters, such as torsional and transverse flexibilities of the shafts and prime mover/load inertias, on free and forced vibration characteristics are investigated. Several reduced order LTI models are developed and validated by comparing their eigen solutions with the finite element model results. Using the reduced order formulations, a three degree of freedom dynamic model is developed which includes nonlinearities associated with radical clearances in the radial rolling element bearings, backlash between a spur gear pair and periodically varying gear mesh stiffness. As a limiting case, a single degree of freedom model of the spur gear pair with backlash is considered and mathematical conditions for tooth separation and back collision are defined. Both digital simulation technique and analytical models such as method of harmonic balance and the method of multiple scales were used to develop the steady state frequency response characteristics for various nonlinear and/or time varying cases.
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