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 language | English |
|---|---|
| Title of host publication | 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012 |
| Pages | 152-157 |
| Number of pages | 6 |
| DOIs | |
| Publication status | Published - 2012 |
| Externally published | Yes |
| Event | 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012 - Saigon, Viet Nam Duration: Nov 26 2012 → Nov 29 2012 |
Other
| Other | 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012 |
|---|---|
| Country | Viet Nam |
| City | Saigon |
| Period | 11/26/12 → 11/29/12 |
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ASJC Scopus subject areas
- Information Systems
- Control and Systems Engineering
Cite this
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 proceeding › Conference contribution
}
TY - GEN
T1 - Experimental modal analysis of a seismo-type velocity sensor toward bandwidth expansion of an absolute displacement sensor
AU - Kai, Takashi
AU - Uemoto, Takaaki
AU - Nakamura, Yukinori
AU - Wakui, Shinji
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84874787090&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84874787090&partnerID=8YFLogxK
U2 - 10.1109/ICCAIS.2012.6466577
DO - 10.1109/ICCAIS.2012.6466577
M3 - Conference contribution
SN - 9781467308137
SP - 152
EP - 157
BT - 2012 International Conference on Control, Automation and Information Sciences, ICCAIS 2012
ER -