Unbalance force and phase estimation (rotor balancer)
Main sequence of the balancing analysis.
Estimation of unbalance force and phase on a rotating motor from imported IR tachometer and vibration signals. The rotational frequency is determined in two independent ways for plausibility: through FFT with peak detection and through pitch analysis of the fundamental frequency. For the unbalance analysis both signals are band-pass filtered, mean-centred and scaled to the standard deviation; the cross-correlation yields the time offset through the lag position, which is converted into a phase shift in degrees.
Workflows in detail
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Rotating Machine Balancing
Main sequence of the balancing analysis.
Start → import IR tacho → import vibration → rotational frequency analysis (FFT) → rotational frequency analysis (pitch) → set rotational frequency → rotating unbalance analysis → end; error flow present.
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Rotating Unbalance
Characteristic block of the unbalance calculation.
Characteristic start → band-pass tacho → band-pass vibration → mean centring → scaling → cross-correlation → time offset through lag position → phase shift in degrees → characteristic end.
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Rotational frequency estimation (FFT / pitch)
Two independent methods for determining the rotational frequency.
FFT path: FFT of both signals → peak detection → position of the first peak. Pitch path: fundamental frequency of the tacho pulses and of the vibration signal.
Take it with you
Import through the SonicTC DbManager — individually or merged into an existing database.
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