Andromeda Computer Systems Ltd.

 

Torsional Vibration Testing

We look at torsional vibrations over time, which can be useful for detecting resonance frequencies which might otherwise be difficult to isolate.

When a machine ramps up to speed and then reaches setpoint, we can sometimes see a brief ringing at the shaft's natural resonance frequency (coming up to setpoint is a bit like hitting the shaft with a hammer, while it's in place).

In this graph, we have captured a machine startup cycle, and have applied pre-processing to eliminate glitches in the shaft encoder (we can work with a variety of devices from shaft encoders to optical strips).

 

A machine starts up, and reaches operating setpoint

We look at torsional vibrations over time, which can be useful for detecting resonance frequencies which might otherwise be difficult to isolate.

When a machine ramps up to speed and then reaches setpoint, we can sometimes see a brief ringing at the shaft's natural resonance frequency (coming up to setpoint is a bit like hitting the shaft with a hammer, while it's in place).

Here we we see the resonances at a particular point during a machine's startup cycle.

Orders can be marked in red: the resonance energy is shown in white.


Here we are looking at the resonance energy over the duration of the startup ramp, looking for transient events.

 

 

 

 

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All images ©Feb, 2006, John Heerema, All rights reserved —