effect of accelerometer mass on thin plate vibration - Jurnal Mekanikal

Jurnal Mekanikal, December 2009
Table 5 : Natural frequencies <strong>of</strong> plate from impact test
m a
(g)
%
<strong>of</strong>
m a 1
%
diff
2
%
diff
Natural Frequencies (Hz) and Mode
3
%
diff
5.84 1.3 43 0.0 113 0.0 286 0.0 371 0.0 421 0.0 729 0.0
15.84 3.5 43 0.0 112 0.9 286 0.0 371 0.0 421 0.0 727 0.3
25.84 5.8 43 0.5 110 2.7 286 0.0 369 0.5 421 0.0 723 0.8
35.84 8.0 42 2.1 109 3.5 285 0.3 367 1.1 421 0.0 715 1.9
45.84 10.2 42 3.0 108 4.4 284 0.7 359 3.2 421 0.0 717 1.6
4
%
diff
5
%
diff
6
%
diff
4.3 Case 3 : Location <strong>of</strong> the <strong>accelerometer</strong> is at point 3 (P3)
Table 6 : Natural frequencies <strong>of</strong> plate from numerical analysis
m a
(g)
%
<strong>of</strong>
m a 1
%
diff
2
%
diff
Natural Frequencies (Hz) and Mode
3
0.0 0.0 45 0.0 113 0.0 275 0.0 372 0.0 407 0.0 723 0.0
5.84 1.3 45 0.0 113 0.0 275 0.0 370 0.5 407 0.0 716 1.0
15.84 3.5 45 0.0 113 0.0 271 1.5 363 2.4 407 0.0 701 3.0
25.84 5.8 44 2.2 113 0.0 267 2.9 357 4.0 407 0.0 689 4.7
35.84 8 44 2.2 113 0.0 263 4.4 353 5.1 407 0.0 678 6.2
45.84 10.2 44 2.2 113 0.0 259 5.8 349 6.2 407 0.0 670 7.3
%
diff
4
%
diff
5
%
diff
6
%
diff
Table 7 : Natural frequencies <strong>of</strong> plate from impact test
m a
(g)
% <strong>of</strong> Natural Frequencies (Hz) and Mode
m a 1
%
diff
2
%
diff
3
5.84 1.3 43.3 0.0 114 0.0 285 0.0 370 0.0 - - 715 0.0
15.84 3.5 43.3 0.0 114 0.0 279 2.1 361 2.4 - - 697 2.5
25.84 5.8 43.2 0.2 114 0.0 276 3.2 355 4.1 - - 682 4.6
35.84 8.0 43.2 0.2 114 0.0 271 4.9 350 5.4 - - 669 6.4
45.84 10.2 43.1 0.5 114 0.0 267 6.3 346 6.5 - - 660 7.7
%
diff
4
%
diff
5
%
diff
6
%
diff
105