Acceleration vs. Velocity
When collecting a waveform, it is important to note that we generally want to see high-frequency information. When integrating a signal from acceleration to velocity, the high-frequency response is greatly reduced in level, and many small irregularities in the waveform are not visible. Therefore, it is a generally valid rule of thumb that we should use vibration acceleration rather than velocity as the measurement parameter.
However there are cases, especially in low-speed machines, when low-frequency information is interesting to us, and then integration to velocity, or even to displacement, can be used. Of course, the integration must be done to the input signal from the accelerometer. It is not possible to digitally integrate the acceleration waveform.
Azima DLI provides products and services for Predictive Maintenance including vibration analysis instruments, monitoring and diagnostic software, and consulting for CBM programs.
© 2009 - Azima DLI