Research Papers

Multi-Objective Ease-Off Optimization of Hypoid Gears for Their Efficiency, Noise, and Durability Performances

[+] Author and Article Information
Alessio Artoni1

Dipartimento di Ingegneria Meccanica, Nucleare e della Produzione,  University of Pisa, Largo Lucio Lazzarino 2, 56122 Pisa, Italyalessio.artoni@ing.unipi.it

Marco Gabiccini

Gear and Power Transmission Research Laboratory,  The Ohio State University, 201 West 19th Avenue, Columbus, OH 43210m.gabiccini@ing.unipi.it

Massimo Guiggiani

Gear and Power Transmission Research Laboratory,  The Ohio State University, 201 West 19th Avenue, Columbus, OH 43210guiggiani@ing.unipi.it

Ahmet Kahraman

Gear and Power Transmission Research Laboratory,  The Ohio State University, 201 West 19th Avenue, Columbus, OH 43210kahraman.1@osu.edu


Corresponding author.

J. Mech. Des 133(12), 121007 (Dec 09, 2011) (9 pages) doi:10.1115/1.4005234 History: Received June 04, 2011; Revised September 29, 2011; Published December 09, 2011; Online December 09, 2011

Microgeometry optimization has become an important phase of gear design that can remarkably enhance gear performance. For spiral bevel and hypoid gears, microgeometry is typically represented by ease-off topography. The optimal ease-off shape can be defined as the outcome of a process where generally conflicting objective functions are simultaneously minimized (or maximized), in the presence of constraints. This matter naturally lends itself to be framed as a multi-objective optimization problem. This paper proposes a general algorithmic framework for ease-off multi-objective optimization, with special attention given to computational efficiency. Its implementation is fully detailed. A simulation model for loaded tooth contact analysis is assumed to be available. The proposed method is demonstrated on a face-hobbed hypoid gear set. Three objectives are defined: maximization of gear mesh mechanical efficiency, minimization of loaded transmission error, minimization of maximum contact pressure. Bound constraints on the design variables are imposed, as well as a nonlinear constraint aimed at keeping the loaded contact pattern inside a predefined allowable contact region. The results show that the proposed method can obtain optimal ease-off topographies that significantly improve the basic design performances. It is also evident that the method is general enough to handle geometry optimization of any gear type.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Example of a multi-objective optimization problem and its Pareto-optimal set

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Figure 2

Achievement function approach on a nonconvex problem with (a) an infeasible reference point and (b) a feasible one

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Figure 3

Graphical representation of three iterations of DIRECT, adapted from Ref. [23]

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Figure 4

Two iterations of the reference point method on a problem with two objectives

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Figure 5

Example of (a) a standard ease-off representation and (b) the corresponding contour plot of it (drawn on the gear-based PCA)

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Figure 6

Pseudocode of the proposed algorithm for ease-off MOO

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Figure 7

Basic design: (a) loaded contact pattern and (b) ease-off surface

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Figure 8

Results of T est 1 (five design variables)

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Figure 9

Results of T est 2 (nine design variables)

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Figure 10

Results of T est 3 (fourteen design variables)




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