A Parametric study on planetary gear dynamics

Download

index.pdf

Date

2018

Author

Öztürk, Veysel Yalın

Metadata

Show full item record

Item Usage Stats

208
views

94
downloads

An extended parametric study is performed for Planetary Gear Train (PGTs) dynamics. A purely torsional, non-linear time-varying model is used for the dynamic simulation of PGTs. Time-dependent stiffness functions are calculated by using dedicated contact mechanics software that is specialized in gears. Multi-term Harmonic Balance Method (HBM) is used for the solution of the model. The fundamental modal characteristics of PGTs are explored. The initial parametric studies are performed for the basic dynamic factors in PGTs, namely for different mesh phasing configurations, varying damping levels, different amounts of backlash and different contact ratios for the mating sun-planet and ring-planet meshes. The effect of ring gear elasticity on torsional PGT dynamics is investigated in detail. The direct effects of parameters, which influence the ring gear elasticity, on PGT dynamics are studied. Tooth Profile Modifications (TPMs), which are one of the most effective means of reducing the vibration in gears, are first studied on spur gears. The differences between the ideal TPM designs for different objective functions of minimizing Loaded Static Transmission Error (LSTE) and Dynamic Transmission Error (DTE) are analyzed for gears mounted on rigid and compliant shafts. The positive influence of proper TPM applications on increasing the bending fatigue lives are shown by analyzing the stress cycles on TPM applied spur gear pairs. Next, a comprehensive study is performed on the characteristics of ideal TPMs in PGTs. The dependence of ideal TPM designs on modal characteristics of PGTs is shown. The conditions in which the ideal TPM differs from the TPM configurations that minimize LSTE are explored.

Subject Keywords

Gearing., Elasticity., Harmonic functions.

URI

http://etd.lib.metu.edu.tr/upload/12622142/index.pdf
https://hdl.handle.net/11511/27329

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

A comparative study of the electronic properties of aluminum nitride compounds Mohammad, Rezek; Katırcıoğlu, Şenay (2016-01-01) Electronic properties of aluminum nitride in wurtzite, zinc-blende, and rock-salt phases are investigated by a full potential-linearized augmented plane waves method based on density functional theory within standard local density approximation and its four improved versions. Local density approximation corrected by the generalized gradient functional of Perdew-Wang-Engel-Vosko is found to be more successful than the other generalized gradient functional approximations considered in this work for providing ...
A weak-form spectral Chebyshev technique for nonlinear vibrations of rotating functionally graded beams Lotfan, Saeed; Dedekoy, Demir; Bediz, Bekir; Ciğeroğlu, Ender (2023-02-01) This study presents the spectral Chebyshev technique (SCT) for nonlinear vibrations of rotating beams based on a weak formulation. In addition to providing a fast-converging and precise solution for linear vibrations of structures with complex geometry, material, and physics, this method is further advanced to be able to analyze the nonlinear vibration behavior of continuous systems. Rotational motion and material gradation further complicate this nonlinear behavior. Accordingly, the beam is considered to b...
Nonlinear dynamics of spiral bevel gear pair Önal, Birkan; Ciğeroğlu, Ender; Sarıbay, Zihni Burçay; Department of Mechanical Engineering (2018) Nonlinear dynamics of a generic spiral bevel gear pair used in high speed, high power gearboxes is studied in this thesis. Different tooth ease-off topographies are generated based on real machine settings. Tooth micro geometries are established in order to obtain profile crowning, lengthwise crowning and flank twist topographies. Details of macro and micro geometry and corresponding real machine settings are given in this study. Path of contact, contact stress, directional rotation radius, load share, unlo...
A Computational analysis on rotor-propeller arm interaction in hovering flight Yener, Serkan.; Perçin, Mustafa; Department of Aerospace Engineering (2019) This study presents a computational analysis on the interaction between rotor and different rotor frame-arm geometries in hovering flight. The influence of the frame arm on the aerodynamic performance of the rotor is assessed by using commercially available computational fluid dynamics (CFD) solver software ANSYS Inc. Fluent 17. Numerical results are validated for hovering and forward vertical climb flight conditions with thrust and torque measurements conducted on a 16x4 carbon fiber propeller. The thrust ...
Nonlinear Dynamic Analysis of a Spiral Bevel Geared System Yavuz, Siar Deniz; Saribay, Zihni Burcay; Ciğeroğlu, Ender (2017-02-02) A nonlinear dynamic model of a spiral bevel gear train mounted on flexible shafts and bearings is proposed in this study. The finite element model of shafts is combined with a three-dimensional discrete mesh model of a spiral bevel gear pair. Bearing flexibilities are as well included in the model. Gear backlash is incorporated into the model in the form of clearance-type displacement functions and clearance nonlinearity and stiffness fluctuations of the bearings are neglected. A time-invariant mesh stiffne...

Citation Formats

V. Y. Öztürk, “A Parametric study on planetary gear dynamics,” Ph.D. - Doctoral Program, Middle East Technical University, 2018.