This work develops an understanding of the flow mechanisms that induce vibrations on automotive side view mirrors. The unsteady nature of the flow over side view mirrors causes unsteady aerodynamic load distributions and flow-induced vibrations on the mirror assembly. These vibrations generate blurred rear-view images and higher noise levels, affecting the mirror functionality and passenger comfort. Certain geometrical design features of side view mirrors can exacerbate the flow-induced vibration levels of the mirror assembly significantly. This work quantifies the impact of these design features on the vibration amplitude, develops a methodology for testing mirror vibrations in a small, low-speed wind tunnel using only the mirror of interest, and delves into the interactions between the bluff body mirror geometry and its wake. Two similar side view mirror designs were investigated in this work by using laser-based vibrometry, flow visualization, particle image velocimetry, hot film anemometry, and surface stress sensitive film techniques. The magnitude of the vibrations was found to depend on the level of excursion in the dynamic location of flow separation, particularly when characteristic flow frequencies couple with the mirror housing natural frequency.
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e-mail: tomac.1@osu.edu
e-mail: yugulis.3@osu.edu
e-mail: gregory.234@osu.edu
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December 2011
Research Papers
Investigation of Vibration Phenomena Induced by Air Flow Over Side View Mirror
Mehmet N. Tomac,
Mehmet N. Tomac
Aeronautical and Astronautical Research Laboratory,
e-mail: tomac.1@osu.edu
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235
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Kevin Yugulis,
Kevin Yugulis
Aeronautical and Astronautical Research Laboratory,
e-mail: yugulis.3@osu.edu
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235
Search for other works by this author on:
James W. Gregory,
James W. Gregory
Aeronautical and Astronautical Research Laboratory,
e-mail: gregory.234@osu.edu
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235
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Tony Ferrito
Tony Ferrito
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Mehmet N. Tomac
Aeronautical and Astronautical Research Laboratory,
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235e-mail: tomac.1@osu.edu
Kevin Yugulis
Aeronautical and Astronautical Research Laboratory,
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235e-mail: yugulis.3@osu.edu
James W. Gregory
Aeronautical and Astronautical Research Laboratory,
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235e-mail: gregory.234@osu.edu
James Loftus
Tony Ferrito
J. Fluids Eng. Dec 2011, 133(12): 121102 (9 pages)
Published Online: December 19, 2011
Article history
Received:
December 31, 2010
Revised:
October 24, 2011
Online:
December 19, 2011
Published:
December 19, 2011
Citation
Tomac, M. N., Yugulis, K., Gregory, J. W., Loftus, J., and Ferrito, T. (December 19, 2011). "Investigation of Vibration Phenomena Induced by Air Flow Over Side View Mirror." ASME. J. Fluids Eng. December 2011; 133(12): 121102. https://doi.org/10.1115/1.4005425
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