Title:
METHOD FOR INHIBITING AND CONTROLLING PITCHING OF MULTI- DIMENSIONAL VIBRATING TABLE
Document Type and Number:
Japanese Patent JPS60195623
Kind Code:
A
Abstract:
PURPOSE:To achieve a high pitching inhibiting effect, by evaluating a horizontal vibration input signal by using the difference in horizontal acceleration and pitching ratio and adjusting the phase and gain of the signal, and then, outputting the adjusted signal to an upper and lower vibrating machines as a correcting signal. CONSTITUTION:Horizontal accelerations xm and xt of a test piece 10 and vibrating table 12 from the test piece 10 and horizontal acceleration sensors 34 and 28 fitted to the vibrating table 12 are inputted in a phase difference detector 36 and their phase difference is obtained. The phas difference is sent to a phase delay adjuster 38 where the phase difference is added to a horizontal vibration signal rx. Moreover, upward and downward accelerations z1 and z2 are fetched from upward and downward acceleration sensors 281 and 282 fitted to the upper and lower vibrators 161 and 162 of the vibrating table 12 and their difference DELTAz is calculated by an adder and their pitching ratio DELTAz/xt is calculated by a pitching ratio detector 42. The calculated difference DELTAz and pitching ratio DELTAz/xt are inputted in a gain adjuster 44 where the amplitude of the signal rx is adjusted. The output of the adjuster 44 is outputted to vibrators 161 and 162 as correcting signals. Therfore, the vibrating table 12 is vibrated in the pitching inhibiting direction.
Inventors:
FUJIWARA KOUJI
Application Number:
JP5133684A
Publication Date:
October 04, 1985
Filing Date:
March 16, 1984
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G01M7/02; G05D19/02; (IPC1-7): G01M7/00; G05D19/00
Attorney, Agent or Firm:
Tatsuyuki Unuma
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