Virtual Tacho
SAMURAI™ Option
Rotational Speed Measurement using FFT Analysis
Rotational Speed Measurement using FFT Analysis
Overview
Application
This option enables the determination of rotation speed using a narrowband spectrum of a sensor (e.g., microphone or accelerometer). It can be used, for example, in situations where a laser tachometer or other speed pulse sources are not available. The prerequisite is that the rotation frequency or its harmonics are sufficiently represented by local maxima in the spectrum.
Description
Typically, sensors for structure-borne noise (e.g., with closed pumps) or microphones (e.g., fans) are used. The user selects an FFT spectrum of a sensor displayed in Samurai ™, the approximate speed and the order of the fundamental frequency to be used in the FFT spectrum. The approximate relevant frequency can also be set visually during the measurement by placing a cursor.
Figure 1:
Detection of the fundamental frequency in the FFT spectrum
Figure 2:
Measurement on a fan with a speed sensor. Comparison of the measured speed with the calculated speed. You can see the FFT spectrum, history graph and the analog speed display of the measured and calculated speed of the virtual tachometer.
Features
| Signals | Typically used with microphones or sensors for structure-borne signals |
| Scope |
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Requirements
This software option requires a valid SAMURAI™ base license.