Frame Flexibility Effects on Engine Mount Optimization for Vibration Isolation in Motorcycles

[+] Author and Article Information
Sudhir Kaul1

Department of Mechanical Engineering, University of Wisconsin, Milwaukee, WI 53201

Anoop K. Dhingra2

Department of Mechanical Engineering, University of Wisconsin, Milwaukee, WI 53201dhingra@uwm.edu

Timothy G. Hunter

Frame Technology Group, PDC, Harley Davidson Motor Co., Wauwatosa, WI 53225


Currently at Frame Technology Group, PDC, Harley Davidson Motor Company.


Corresponding author.

J. Vib. Acoust 129(5), 590-600 (Feb 26, 2007) (11 pages) doi:10.1115/1.2748468 History: Received May 17, 2006; Revised February 26, 2007

This paper examines the influence of frame flexibility on the optimization of an engine mounting system for enhanced vibration isolation in motorcycles. A theoretical model is developed to represent the structural dynamics of an engine mount system in motorcycles. The model consists of the power-train assembly, modeled as a six-degree-of-freedom (DOF) rigid body; the swing arm assembly, connected to the power-train through a coupler shaft assembly; and the frame, connected to the power-train by elastomeric mounts and to the swing-arm through the rear suspension. Two models of the flexible frame are developed for analysis. The first model uses an equivalent stiffness matrix of the frame, derived from its finite element model, in terms of the nodes connecting the frame to the other subsystems. The second model is based on a dynamic model of the frame as well as the swing arm derived from their respective finite element models. The optimization procedure minimizes the load transmitted to the frame while constraining the engine displacement due to imposed loads within prescribed limits. The mount stiffnesses, locations and orientations are used as design variables. Examples are presented to demonstrate the influence of frame flexibility on the force transmitted to the frame.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 8

Reconstructed time history

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Figure 9

Time history of road load

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Figure 1

Power-train assembly

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Figure 2

Twelve-DOF system layout

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Figure 3

Frame natural frequencies

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Figure 4

Mount system layout

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Figure 5

Shaking forces due to engine imbalance

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Figure 6

Frame finite element model



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