A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Active control of flexible beams using filtered velocity feedback controllers
This paper investigated the active vibration control of clamp beams using FVF (filtered velocity feedback) controllers with non-collocated sensor/moment pair actuator configuration. The moment pair actuator is used as the control actuator and the velocity sensor is used as the feedback sensor located at the opposite center of the moment pair. This non-collocated configuration is the main source of instability problems in control systems. In order to overcome the instability problem due to the non-collocated sensor/moment pair actuator configuration, FVF controller is proposed. To obtain the characteristics of the FVF controller, a parametric study is conducted. Following conclusions are highlighted: A parametric study on the design parameters of the FVF controller was conducted to characterize their effects on the stability and the performance of the controller. The design parameters are the gain, and the damping ratio of the controller. The magnitude of the OLTF (Open Loop Transfer Function) was increased without variation of the phase in the all frequencies as the gain was increased. If there are some potentially unstable response of OLTF, they will be able to across or encircle the (-1,j0) point as gain is increased. This means that the control system can fall in unstable state. The magnitude of the OLTF was decreased as the damping ratio is increased around the tuning frequency range, and the phase of the OLTF was affected in a wider range of the tuned mode as the damping ratio was increased. This means that the control system with a high damping ratio of the FVF controller can be obtained. The high damping leads to a high gain margin and a high phase margin. So, the control system is stabilized with the increase of the damping ratio. Because a FVF controller is the second order filter, the controller significantly affects to the response at lower modes below the tuning frequency. Hence, multi-mode responses can be controlled for a FVF controller. Also, the roll-off property as the characteristic of the second order filter can reduce the magnitude of the unstable responses at high frequencies including unmodeled range. A FVF controller was implemented under 2kHz. Using the FVF controller, structural responses are successfully reduced under 2kHz.
Active control of flexible beams using filtered velocity feedback controllers
This paper investigated the active vibration control of clamp beams using FVF (filtered velocity feedback) controllers with non-collocated sensor/moment pair actuator configuration. The moment pair actuator is used as the control actuator and the velocity sensor is used as the feedback sensor located at the opposite center of the moment pair. This non-collocated configuration is the main source of instability problems in control systems. In order to overcome the instability problem due to the non-collocated sensor/moment pair actuator configuration, FVF controller is proposed. To obtain the characteristics of the FVF controller, a parametric study is conducted. Following conclusions are highlighted: A parametric study on the design parameters of the FVF controller was conducted to characterize their effects on the stability and the performance of the controller. The design parameters are the gain, and the damping ratio of the controller. The magnitude of the OLTF (Open Loop Transfer Function) was increased without variation of the phase in the all frequencies as the gain was increased. If there are some potentially unstable response of OLTF, they will be able to across or encircle the (-1,j0) point as gain is increased. This means that the control system can fall in unstable state. The magnitude of the OLTF was decreased as the damping ratio is increased around the tuning frequency range, and the phase of the OLTF was affected in a wider range of the tuned mode as the damping ratio was increased. This means that the control system with a high damping ratio of the FVF controller can be obtained. The high damping leads to a high gain margin and a high phase margin. So, the control system is stabilized with the increase of the damping ratio. Because a FVF controller is the second order filter, the controller significantly affects to the response at lower modes below the tuning frequency. Hence, multi-mode responses can be controlled for a FVF controller. Also, the roll-off property as the characteristic of the second order filter can reduce the magnitude of the unstable responses at high frequencies including unmodeled range. A FVF controller was implemented under 2kHz. Using the FVF controller, structural responses are successfully reduced under 2kHz.
Active control of flexible beams using filtered velocity feedback controllers
Hong, Chinsuk (author) / Shin, Changjoo (author) / Jeong, Weui Bong (author) / Lee, Han-wool (author)
2012
14 Seiten, 10 Bilder, 1 Tabelle, 16 Quellen
Conference paper
English
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