PROBLEM TO BE SOLVED: To reduce costs and facilitate maintenance by providing the same constitutions for horizontal and vertical vibration generators and unitizing them in a vibration testing system.;SOLUTION: The upper and lower vertical vibration generators 23a, 23b are opposed to each other. The directions of magnetic flux by magnetic circuits generated by drive coils 29 of the upper and lower vertical vibration generators 23a, 23b are opposed to each other, and the two independent magnetic circuits by the upper and lower vertical vibration generators 23a, 23b form a serial combination. It is therefore possible to generate an exciting force twice that of one vertical vibration generator by the two vertical vibration generators 23a, 23b. It is therefore possible for a vertical vibration generating part 23 to generate the same exciting force as that of horizontal vibration generating parts 21, 22 each provided in the front, in the back, and on both sides and excite the shaking table 4. The vibration generators 21a-23b constituting the horizontal and vertical vibration generating parts 21-23 are provided with the same constitutions.;COPYRIGHT: (C)2005,JPO&NCIPI
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