ELECTRODYNAMIC SHAKER Russian patent published in 2015 - IPC G01M7/02 

FIELD: electricity.

SUBSTANCE: electrodynamic shaker is intended for testing of multiresonant articles with sinusoidal vibration of variable frequency using automatic control device comprising circuit of additional negative feedback with band-stop filter (9) made as in-series variable frequency fundamental harmonic extractor (10) and subtracting unit (11), which output is connected to input of power amplifier (3) and inputs are coupled respectively to outputs of the extractor (10) and vibration-measuring converter (7) installed at the article (6). At article (6) testing due to non-linear effects of excitation and transmission of sinusoidal vibration of variable frequency spurious harmonics of high frequency occur, which are extracted by band-stop filter (9), supplied in antiphase through power amplifier (3) to moving coil (4) of electrodynamic exciter and suppress the same harmonics occurring in result of the above non-linearities in mechanic subsystem of "moving part of the exciter + article".

EFFECT: significant reduction of distortions on vibrotesting modes for multiresonant articles.

1 dwg