Page 23 - Vibrations
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With each rotation it is stressed.
The greater the stress on each rotation (the greater
the vibration) the greater the probability of
fracture – fracture mechanics.
Potentially after the component has been stressed
a sufficient number of times, it could fracture and
catastrophic failure can occur.
Although it will have torsional stress, this is
relatively static for a fixed rotation rate
The frequency of the vibration is the number of
stresses the component suffers per second.
Frequency
By now frequency has been discussed on several
occasions - measured in Hz.
The frequencies we can hear range from 15Hz to
20kHz.
Fourier Transform
To observe the frequency contents of a signal x(t)
you can use the Fourier Transform which is
expressed as,
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