VIBRATION TESTING DEVICE FOR STRUCTURE, DIGITAL COMPUTER USED THEREFOR, AND METHOD FOR VIBRATION TEST

摘要

PROBLEM TO BE SOLVED: To easily perform vibration tests with high accuracy even when the natural period of a numerical analysis model is short. SOLUTION: During the course of the vibration tests in which vibration tests by means of an exciter 4 and numerical calculations by means of a computer 5 are simultaneously advanced through the medium of a load applied by means of the exciter 4 and a command value outputted from the computer 5 to the exciter 4, vibration response analysis is performed in a mode space. In addition, a partial mode is calculated as a first-order lag system from which an inertial term is removed. Consequently, the time increment of the vibration calculations can be made larger and the execution of the vibration tests in real time becomes easier, because the time increment is decided depending upon the shortest natural period of a natural mode in which the time ticking is calculated as a second-order lag system.