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Research Papers: Flows in Complex Systems

Investigation of Vibration Phenomena Induced by Air Flow Over Side View Mirror

[+] Author and Article Information
Mehmet N. Tomac

Aeronautical and Astronautical Research Laboratory,  The Ohio State University, 2300 West Case Road, Columbus, OH 43235tomac.1@osu.edu

Kevin Yugulis

Aeronautical and Astronautical Research Laboratory,  The Ohio State University, 2300 West Case Road, Columbus, OH 43235yugulis.3@osu.edu

James W. Gregory

Aeronautical and Astronautical Research Laboratory,  The Ohio State University, 2300 West Case Road, Columbus, OH 43235gregory.234@osu.edu

James Loftus

 Honda R&D Americas, Inc., 21001 State Route 739, Raymond, OH 43067jloftus@oh.hra.com

Tony Ferrito

 Honda R&D Americas, Inc., 21001 State Route 739, Raymond, OH 43067tferrito@oh.hra.com

J. Fluids Eng 133(12), 121102 (Dec 19, 2011) (9 pages) doi:10.1115/1.4005425 History: Received December 31, 2010; Revised October 24, 2011; Published December 19, 2011; Online December 19, 2011

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.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Turn signal mirror geometry

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Figure 2

Baseline mirror geometry

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Figure 3

(a) Cross sections of the mirrors and (b) mirror assembly on the fixture

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Figure 4

Schematic view of the laser measurement setup

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Figure 5

Schematic of the flow visualization and PIV setups

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Figure 6

Schematic of the hot film setup in the wind tunnel

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Figure 7

Measurement locations of the hot film probe

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Figure 8

(a) Schematic of S3 F technique [9] and (b) applied region on the mirror

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Figure 9

Power spectra of laser vibration measurements for 42 m/s

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Figure 10

Instantaneous vortex structure over the baseline mirror

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Figure 11

Consecutive flow visualization images at 42 m/s

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Figure 12

Instantaneous velocity field over the baseline mirror

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Figure 13

Instantaneous velocity field over the turn signal mirror

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Figure 14

Average velocity magnitude field over the baseline mirror at 42 m/s

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Figure 15

Average velocity magnitude field over the turn signal mirror at 42 m/s

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Figure 16

RMS velocity fluctuations on the baseline mirror at 42 m/s

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Figure 17

RMS velocity fluctuations on the turn signal mirror at 42 m/s

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Figure 18

RMS velocity values for (a) 25 m/s, (b) 33 m/s, and (c) 42 m/s

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Figure 19

Cross-correlation between y-vibration and hot film data for the probe 1 mm away from the surface for BL mirror

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Figure 20

Cross-correlation between y-vibration and hot film data for the probe 6 mm away from the surface for BL mirror

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Figure 21

Cross-correlation between y-vibration and hot film data for the probe 12 mm away from the surface for BL mirror

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Figure 22

Cross-correlation between y-vibration and hot film data for the probe 1 mm away from the surface for TS mirror

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Figure 23

Cross-correlation between y-vibration and hot film data for the probe 6 mm away from the surface for TS mirror

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Figure 24

Cross-correlation between y-vibration and hot film data for the probe 12 mm away from the surface for TS mirror

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Figure 25

Shear deformations in streamwise direction (δ) and flow direction vectors obtained by S3 F technique

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