Research Papers

Dynamic Performance of the LeBlanc Balancer for Automatic Washing Machines

[+] Author and Article Information
Leonardo Urbiola-Soto1

 Mabe Technology and Projects, Acceso B, No. 406, Querétaro 76100, Mexicoleonardo.urbiola@mabe.com.mx

Marcelo Lopez-Parra

Department of Mechanical Engineering, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, Mexico


Corresponding author.

J. Vib. Acoust 133(4), 041014 (Apr 11, 2011) (8 pages) doi:10.1115/1.4003597 History: Received May 09, 2010; Revised October 15, 2010; Published April 11, 2011; Online April 11, 2011

The paper describes a high-speed camera and a particle image velocimetry (PIV) technique used on a transparent liquid balancing device for washing machines. Experimental results indicate that the baffle-liquid interaction renders fluid modes of vibration of circumferential and axial types. This complex swirl flow is comprised of two inertial waves; one of such waves is synchronous with the rigid body motion, while the other is a fluid backward traveling wave, thus enhancing the system damping capability. This damping phenomenon was revealed by the fluid flow visualization and PIV technique employed.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Washing machine cut-away view

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Figure 2

Laser displacement transducer array

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Figure 3

Transparent balance ring: (a) top view and (b) radial baffle; dimensions in millimeters

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Figure 4

Fluid flow visualization: (a) high-speed camera top view, (b) fluid flow attached to the outer wall at 15.7 rad/s (150 rpm), and (c) PIV experimental array

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Figure 5

Fluid bulk-flow in a hollow ring with no baffles: (a) top view and (b) side view

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Figure 6

Backward traveling wave: (a) top view and (b) side view; (+) and (−) indicate a crest and a valley, respectively

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Figure 7

Modes of vibration: (a) circumferential modes of vibration of a thin wall ring and (b) lateral mode shapes of a string

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Figure 8

Complex 3D wave: (a) side view with crest and valley and (b) coupled vibrating modes; m=4 and n=8

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Figure 9

Balance ring relative velocity map

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Figure 10

Velocity histogram

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Figure 11

Waterfall vibration plot of balance ring vibration: (a) x-axis and (b) y-axis

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Figure 12

Fluid distribution: (a) case I, (b) case II, (c) case III, (d) case IV, (e) case V, and (f) fluid center of mass location (— and --) and fluid force (ο’s)

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Figure 13

Dynamic model; displacement vector and force diagram

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Figure 14

Washing machine dynamic unbalanced response at a fill ratio of 0.8

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Figure 15

Fluid distribution relative to unbalance mass location: (a) unbalance mass location and (b) relative location of the thinnest fluid zone to the unbalance mass location

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Figure 16

Washing machine dynamic unbalanced response at a fill ratio of 0

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Figure 17

Washing machine dynamic unbalanced response at a fill ratio of 0.5




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