The document summarizes the analysis of a brake rotor. A brake rotor was designed in CAD and its frequencies were tested and recorded, with the main normal mode being around 1014 Hz. The actual brake rotor was also tested and its normal mode calculated and compared to the CAD results. The normal mode from the CAD analysis was 1014 Hz while the normal mode from the LMS test results was 1013 Hz, indicating the main normal mode of the brake rotor is around 1014 Hz.

1. Brake Rotor Analysis
Sean Clark

2. Design
A brake rotor was designed in CAD based off of an existing brake rotor

3. Test
On Cad the frequencies were tested and recorded listed as the following
The Actual modes of the Brake Rotor were calcuated and compared to the CAD results

4. Results
0.00 Hz 8200.00
7.60
0.00
Amplitude
g/N
1.00
0.00
Amplitude
1013.00 1682.00 2186.00 2909.00 3386.00
3651.00
5089.00 6344.00
6720.00
7544.00
F FRF accel/hammer truck_rotor_9_23_2014 Run 3_hard_tip
LMS Results
Mode
No.
Frequency(Rad/s
ec)
Frequency(Her
tz) Period(Seconds)
1 0 0 1.00E+32
2 1.49E-08 2.37E-09 4.22E+08
3 2.11E-08 3.35E-09 2.98E+08
4 0.0014048 0.00022357 4472.8
5 0.0018695 0.00029754 3360.9
6 0.0018767 0.00029868 3348.1
7 6372.4 1014.2 0.00098599
8 6373.3 1014.3 0.00098587
9 11327 1802.8 0.00055469
10 11331 1803.3 0.00055453
11 13911 2213.9 0.00045168
12 14923 2375.1 0.00042104
13 14927 2375.6 0.00042094
14 16463 2620.1 0.00038167
15 16485 2623.7 0.00038115
CAD Results

5. Conclusion
The Normal mode of the Cad Results was 1014 Hertz
The Normal mode of the LMS Results was 1013 Hertz
Based on the results, It can be determined that the normal mode of the Break rotor is roughly 1014 Hertz