| 摘要 |
PURPOSE:To eliminate the influence of noise, by starting an A/D converter from the time point when an exciting force is applied to a structure body and converting an exciting force signal and an oscillation response signal obtained as analog quantities to digital quantities and storing them and repeating these conversion and storage procedures. CONSTITUTION:A shock is given to a structure body 3 through a load meter 2 by an exciting hammer 1 to generate oscillation response signals X1-Xn from oscillation detectors 4 attached to n-number of points of the structure body 3. Components in the band higher than an analyzing frequency band in these oscillation response signals Xi and an exciting force signal F are removed by a low pass filter 20, and an A/D converter 21 receives the exciting force signal F and is started to convert the signal passing through the low pass filter 20 to a digital quantity, and this digital quantity is stored in a storage equipment 22. The shock is given to the structure body 3 several times, and signals stored in the storage equipment 22 are added and averaged, and Fourier conversion is performed to operate a transfer function in an operator 23. |
