Experimental modal analysis of a seismo-type velocity sensor toward bandwidth expansion of an absolute displacement sensor

Takashi Kai, Takaaki Uemoto, Yukinori Nakamura, Shinji Wakui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

In the field of vibration control, accelerometers are widely used as feedback sensors. In addition, according to state feedback control theory, detections of velocity and displacement signals are required to improve anti-vibration performance. Then, an absolute displacement sensor is proposed by modifying a control loop of a seismo-type velocity sensor. Basically, the proposed displacement sensor has the same mechanical structures having a pendulum as a commercial seismo-type velocity sensor. In our previous works, the proposed sensor has been successfully applied as feedback and feedforward sensors. However, it is revealed that bandwidth expansion is necessary as a substitute of the accelerometer. The bandwidth is limited by high frequency resonances observed in high frequency dynamics. In this paper, causes of the resonances are investigated in terms of mechanical resonances of the velocity sensor. At first, operating principles of the velocity and the displacement sensors are explained to show the mechanical structures, and the high frequency dynamics are determined by measuring frequency response functions. Next, experiments on the modal analysis are conducted to specify vibration modes of the pendulum. Finally, the high frequency resonances are suppressed by loading viscoelastic materials.

Original languageEnglish
Title of host publication2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012
Pages152-157
Number of pages6
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012 - Saigon, Viet Nam
Duration: Nov 26 2012Nov 29 2012

Other

Other2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012
CountryViet Nam
CitySaigon
Period11/26/1211/29/12

Fingerprint

Modal analysis
Bandwidth
Sensors
Pendulums
Accelerometers
Feedback
Vibration control
State feedback
Control theory
Feedback control
Frequency response

ASJC Scopus subject areas

  • Information Systems
  • Control and Systems Engineering

Cite this

Kai, T., Uemoto, T., Nakamura, Y., & Wakui, S. (2012). Experimental modal analysis of a seismo-type velocity sensor toward bandwidth expansion of an absolute displacement sensor. In 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012 (pp. 152-157). [6466577] https://doi.org/10.1109/ICCAIS.2012.6466577

Experimental modal analysis of a seismo-type velocity sensor toward bandwidth expansion of an absolute displacement sensor. / Kai, Takashi; Uemoto, Takaaki; Nakamura, Yukinori; Wakui, Shinji.

2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012. 2012. p. 152-157 6466577.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kai, T, Uemoto, T, Nakamura, Y & Wakui, S 2012, Experimental modal analysis of a seismo-type velocity sensor toward bandwidth expansion of an absolute displacement sensor. in 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012., 6466577, pp. 152-157, 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012, Saigon, Viet Nam, 11/26/12. https://doi.org/10.1109/ICCAIS.2012.6466577
Kai T, Uemoto T, Nakamura Y, Wakui S. Experimental modal analysis of a seismo-type velocity sensor toward bandwidth expansion of an absolute displacement sensor. In 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012. 2012. p. 152-157. 6466577 https://doi.org/10.1109/ICCAIS.2012.6466577
Kai, Takashi ; Uemoto, Takaaki ; Nakamura, Yukinori ; Wakui, Shinji. / Experimental modal analysis of a seismo-type velocity sensor toward bandwidth expansion of an absolute displacement sensor. 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012. 2012. pp. 152-157
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