The amplitude of the signal is
much larger in records 240 and above, and sometimes shows considerable variation with rotation
15
angle. The 19 per rotation gear mesh waveform is no longer recognizable in record 240 and above.
Records 240 through 285 contain strong waves near the start and end of the rotation with very weak
waves in the middle. The shape changes to contain 9 distinguishable waves from records 394
through the end of the test. Time histories from the last 9 data records (441 through 449) have the
largest amplitudes and change shape notably from record to record. The shape of record 443
resembles a single frequency sinusoidal wave.