Device for the automatic control of the vibration frequency and/or amplitudes of a variable-moment vibrator
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United States of America Patent
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Feb 12, 2002
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N/A
app pub date -
Dec 23, 1998
filing date -
Dec 24, 1997
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Abstract
The device embodying the invention applies to a variable-moment vibrator comprising at least two trains of eccentrics driven in rotation by a variable-speed motorization, the variation of the vibratory moment being obtained by a phase shifter which generates a phase shift between the rotary motion of the two trains of eccentrics. It comprises at least one accelerometric detector subjected to the vibrations generated by the vibrator, a means for deducing, from the accelerometric data detected, a value representative of the harmfulness of the vibrations, a means for entering a set value and a processor which acts on the phase-shift control of the phase shifter and/or on the component controlling the motorization speed variation in order to maintain the value representing the harmfulness of the vibrations at a level equal to or lower than the set value.
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