DECIDING DEVICE FOR DANGEROUSNESS OF VIBRATION

摘要

PURPOSE: To surely decides the dangerousness of vibrations caused by an earthquake, etc., by calculating vibrational energy per period and providing a dangerousness decision means based on the calculated energy. ;CONSTITUTION: A mobile electrode is oscillated by acceleration generated by vibrations and a capacitance generated between the mobile electrode and a fixed electrode changes. An OR oscillation circuit 5 outputs a signal of the frequency corresponding to the capacitance variation. A microcomputer 2 first calculates vibrational acceleration from the frequency-divided output of the circuit 5. Then the microcomputer 2 integrates the acceleration over a prescribed period. Namely, the microcomputer 2 calculates the speed by finding the area of the acceleration waveform having the prescribed period and calculates the vibrational energy per prescribed period of the vibrations based on a conversion table prepared based a relation expression between the speed and vibrational energy. Thereafter, a control section 20 decides the vibrational energy by comparing the energy with a preset energy level and, when the energy exceeds the level, outputs the corresponding warning output.;COPYRIGHT: (C)1993,JPO&Japio