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Development of Seismometer-Type Absolute Displacement Sensor Aimed for Detecting Earthquake Waves With Large Magnitude and Long Period

[+] Author Affiliations
Kazuto Seto

Seto Vibration Control Laboratory, Kanagawa, Japan

Akihiko Ito

Oiles Corporation, Kanagawa, Japan

Yuichi Iwasaki

Oiles Corporation, Tochigi, Japan

Mitsuru Miyazaki

Oiles Corporation, Tokyo, Japan

Paper No. DSCC2012-MOVIC2012-8821, pp. 849-856; 8 pages
doi:10.1115/DSCC2012-MOVIC2012-8821
From:
  • ASME 2012 5th Annual Dynamic Systems and Control Conference joint with the JSME 2012 11th Motion and Vibration Conference
  • Volume 3: Renewable Energy Systems; Robotics; Robust Control; Single Track Vehicle Dynamics and Control; Stochastic Models, Control and Algorithms in Robotics; Structure Dynamics and Smart Structures; Surgical Robotics; Tire and Suspension Systems Modeling; Vehicle Dynamics and Control; Vibration and Energy; Vibration Control
  • Fort Lauderdale, Florida, USA, October 17–19, 2012
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 978-0-7918-4531-8
  • Copyright © 2012 by ASME

abstract

This paper proposes a novel seismometer-type absolute displacement sensor aimed at detecting earthquake waves with a large magnitude and long period. However, since the measuring range of the displacement sensor is higher than the natural frequency of itself, it is difficult to detect a low frequency vibration below 1 Hz using conventional seismic-type displacement sensors.

In order to provide an absolute displacement detection which is capable of lowering the natural frequency and enlarging the detectable amplitude without causing a structural defect, the relative signals of displacement, velocity, and acceleration between a detected object and the auxiliary mass of the sensor are fed back into the sensor. In addition, phase lag compensation is inserted to adjust phase angles, which are below a frequency lower than 1Hz.

It has been demonstrated that a developed sensor with a small size and lightweight has a detecting range from 0.2 Hz to 10Hz for absolute displacement and velocity. As an additional advantage, the measurement displacement amplitude has been expanded to about 40dB (100 times) for detecting earthquake waves with large magnitude and long period.

Copyright © 2012 by ASME

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