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Satoshi FUTAI,Kazuto SETO,Ryo WATANABE,Yuichi IWASAKI,Mitsuru MIYAZAKI,Toru WATANABE 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
This paper proposes a new type of active seismo-meter measuring vibration possessing long period and wide dynamic range. In order to lower the natural frequency and expand the detectable amplitude, the sensor with the low natural frequency is realized by using feedback control. Besides, analog feedback control circuit consisted of resistors, capacitors and operational amplifiers possess temperature dependency, while digital feedback control circuit consisted of computer and digital signal processor is temperature independent. In this report, a novel digital feedback control circuit is developed and tested to avoid temperature dependency. It has been demonstrated that the detectable frequency range and the dynamic range of that is expanded.
Development of Active Seismometer possessing Expanded Dynamic Range by using Analog Feedback Control
Akihiro HARA,Ryo WATANABE,Kazuto SETO,Toru WATANABE,Yuichi IWASAKI,Mitsuru MIYAZAKI 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
This paper proposes a new type of active seismometer measuring vibration possessing long period and wide dynamic range. In order to lower the natural frequency and expand the detectable amplitude, the sensor with the low natural frequency is realized by using feedback control. Moreover, to compensate phase-delay, third order phase-lag compensator is added to shape measured output. It has been demonstrated that the detectable frequency range of the sensor is extended from 0.1[㎐] to 10[㎐], while the dynamic range of that is expanded up to 57[㏈], namely vibrations that possess 700times larger amplitude than the maximum stroke of the sensor. New sensor body is produced and tested.