1. Updated Velocity Data for undamped panel 2
08/10/2017
Milton Rahman

2. Abaqus analysis of ABH damped panel 2
1st ABH mode
Global Mode 167
Frequency = 1203 Hz

3. Abaqus analysis of ABH undamped panel 2
1st ABH mode
Global mode 292
Frequency =

4. New signal parameters Input signal Data acquisition
Gaussian White Noise
Band-pass filter On FL: 800 FU: 10000
Update Rate : Hz
On duration : 2 secs
Off duration : 0 secs
Data acquisition
Sample rate : Hz
Blocksize :
Number of averages : 20

5.
Shaker 1 2 3 4
Experimental Cells
Non-Experimental Cells

6. Cell 11

7. Cell 11 center to uniform comparison
Possible 1st ABH mode : ≈ 1600 Hz

8. Cell 32

9. Cell 32 center to uniform comparison
Possible 1st ABH mode : ≈ 1700 Hz

10. Cell 43

11. Cell 32 center to uniform comparison
Possible 1st ABH mode : ≈ 1600 Hz

12. Cell 54

13. Cell 32 center to uniform comparison
Possible
1st ABH mode ≈ 1100 Hz ≈ 1600 Hz

14. Comparison of Center Velocities of the closest cell (11) & the farthest cell (54) from Shaker
The velocity of the closest cell is consistently higher than that of the farthest cell as expected

15. Conclusions
Most cut-on frequencies of the damped panel 2 appear to be around Hz from experimental data.
The cut-on frequency of the damped panel 2 appears to be around Hz from Abaqus analysis.
The cut-on frequency of the undamped panel 2 appears to be around Hz from Abaqus analysis. Need to run experiments to confirm.

16. Future Work
Need to test low frequency results to verify where the true location of ABH center divergence.
Take damping layers off in order to take ABH un-damped measurements with vibrometer/shaker setup.
Also need to verify truncation thickness and taper profile after taking damping layers off.
Honeycomb panel modeling. A thesis is available on how to do this.

17. Plans for future testing
Take more velocity data on different cells.
Once we have the charge converter, we can accurately measure the input force. I will then plot the mobility of each test location on each experimental cell.
If damping layers come off without any damage
The plan will be to place all of them on the uniform plates and do testing.
Then we can place the damping layers back on ABH panel 2, and slowly cut them down and do testing at each diameter. The fully undamped panel 2 will be tested as well at the end.
Maybe reapply new damping layers on ABH panel 2 and then add tuning masses for testing.
If they can not come off without damage
Maybe apply some tuning masses to run more tests.
Slowly cut down damping layer and do testing at each diameter.
Cut out new damping layers and place them on the uniform plate to do testing.