PROBLEM TO BE SOLVED: To provide a vibration monitoring system that detects a vibration state of acceleration of a social infrastructure facility, industrial equipment and a production device and determines its operation/failed state and necessity of maintenance, which is a practical system that is not conventionally expensive and large-sized system but can be inexpensively constantly operated and is battery-driven.;SOLUTION: There is provided an inexpensive vibration monitoring system which is equipped with an analog frequency analyzer that can automatically switch or control a center frequency of a band-pass filter without using expensive and large-sized high-speed amplifier and numerical calculation computer necessary for large power consumption, and thereby can acquire frequency-analyzed vibration data with small size at inexpensive cost by battery-driven, and can transfer or store data at the time of only abnormality in consistently operated state.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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