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Advances in Acoustics and Vibration
Table of Contents
Special Issues
Advances in Acoustics and Vibration
/
2013
/
Article
/
Tab 2
/
Research Article
Determination of the Fundamental Frequency of Perforated Rectangular Plates: Concentrated Negative Mass Approach for the Perforation
Table 2
Coordinates of the perforation centers.
Specimen size (mm × mm)
Coordinates of the perforation centers (
mm,
mm)
×
/4,
/4
/4, 2
/4
/4, 3
/4
2
/4,
/4
2
/4, 2
/4
2
/4, 3
/4
3
/4,
/4
3
/4, 2
/4
3
/4, 3
/4
138 × 216
34.5, 54
34.5, 108
34.5, 162
69, 54
69, 108
69, 162
103.5, 54
103.5, 108
103.5, 162
276 × 432
69, 108
69, 216
69, 324
138, 108
138, 216
138, 324
207, 108
207, 216
207, 324