| 摘要 |
PURPOSE:To perform accurate vibration test, by fixing the driving parts of vibration generators to both end parts of a plate shaped vibrating table in the direction of a driving axis, driving the driving parts only in the pulling directions, respectively, thereby transmitting the vibration to a body under test positively without yielding buckling in the vibrating table. CONSTITUTION:Driving parts 3 and 3 of vibration generators 2 and 2 are fixed to both end parts of a plate shaped vibrating table 4 in the direction of a driving axis G. A body under test, whose vibration is to be tested, is attached to the vibrating table 4. An input signal A is amplified by a preamplifier 6, rectified, and divided into voltage signals B and C, which are inputted to power amplifiers 7 and 7. Signals D and E are applied to the driving coils of the vibration generators 2 and 2, and the driving parts 3 and 3 are driven. The signals D and E have a pulsating waveform. Only tension in the direction of H is made to act. The tensile force having the lowest specified value S positively prevents the bending vibration of the vibrating table 4. |
