Rotational Speed Measurements with Simulated Tachometer Signals
- Updated2024-06-07
- 1 minute(s) read
Rotational Speed Measurements with Simulated Tachometer Signals
Some test environments do not allow you to install a tachometer onto the device under test (DUT) to obtain a speed reference. When this is the case, you can produce a similar value by simulating the signal's speed profile.
You can compute a simulated speed profile from the sound or vibration signal spectral map when you cannot install a tachometer onto the DUT. Use the simulated speed profile to extract order waveforms and compute the order magnitude from those order waveforms. Because of the lack of a real tachometer trigger signal, you cannot obtain accurate phase information with a simulated speed profile.
Related Information
- Rotational Speed
NI Sound and Vibration Measurement Suite supports three different types of tachometers for measuring rotational speed: proximity probes, optical transducers, and encoders.
- Order Waveform Extraction
An order waveform is the time signal associated with a certain order, which is synchronous to the rotational speed. Unlike an order power spectrum, which provides information for all of the orders of a certain time block signal, an order waveform provides information only for one particular order relative to time.
- Order Tracking
You can perform order tracking by computing the order magnitude and phase from an even-angle signal. You also can compute the magnitude and phase of a specific order from the order waveform.