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Analysis package "Vibration Frequency Spectra"

The analysis package "Vibration Frequency Spectra" analyzes vibration signals by calculating selected spectral quantities (Fast Fourier Transformation) such as frequency-based acceleration, acceleration envelope and velocity spectra. These quantities can be used to evaluate the spectral composition of the given input signal considering a fixed frequency range (speed independent) and allows an early detection of mechanical fault of rotating equipment.

Vibration frequency spectra

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② Package name

③ Input fields for name and description of the analysis

④ Available calculations

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Following default parameters are used for the calculation.

Parameter of "Vibration Frequency Spectra"

Area Parameter Description
General Analysis Package Name Add an individual name for your analysis package.
Description Add an individual description (optional).
Calculations Spectrum Acceleration In the case of machines and gears running on roller bearings, the calculation of the vibration acceleration a(t) spectrum may be informative regarding the state of the bearings or toothing. In general, it is suitable to get indications about potential error sources within the higher frequency range (>1000 Hz).
The following default parameter are used for the calculation:
- Bandpass Filter (Hz): 10 - 10.000
- NoP (Number of Points): 131.072
- Lap (Overlap): 0,6
- Resolution (Hz): 0,153
Spectrum Acceleration Envelope Envelope curve analyses are frequently used as a demodulation method in the investigation of periodic, shock type vibration, such as may be encountered with damaged roller bearings or gears. These extremely short-lived, rapidly decaying shocks are not susceptible to direct frequency analysis to determine their periodicity. For this to be done, the envelope curve which envelopes the time function must be determined. With the resulting spectrum of the envelope, it is possible to determine frequencies of periodic, shock type vibration and their potential root cause.
The following default parameter are used for the calculation:
- Bandpass Filter (Hz): 1.000 - 10.000
- Lowpass Filter (Hz): 1.500
- NoP (Number of Points): 16.384
- Lap (Overlap): 0,6
- Resolution (Hz): 0.183
Spectrum Velocity Vibration velocity v(t) is the decisive measured quantity specified in all standards for evaluating vibration in the stationary components of machines with rotating masses. The resulting calculated spectrum of this signal gives indications about potential error sources within the lower frequency range (<1000 Hz).
The following default parameter are used for the calculation:
- Highpass Filter (Hz): 10
- Bandpass Filter (Hz): 10 - 1.000
- NoP (Number of Points): 16.384
- Lap (Overlap): 0,6

You can find more information about extended data types in the appendix.


A fully configured monitoring of the analysis packages "Vibration Characteristic Values" and "Vibration Frequency Spectra" with all channels of one SM1281 and Trigger Rule of type "Continuous", can exceed the CPU performance of the MindConnect Nano. Also, in other scenarios dependent of tasks running in parallel on MindConnect Nano, CPU load can get too high. The recommendation is to use only two fully configured "Vibration Frequency Spectra" analysis packages in parallel, when using a Trigger Rule of type "Continuous".

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Last update: April 20, 2022