Abstract
During construction of extra high structures such as a skyscraper or a main tower of a long bridge, just a slight wind can generate low frequency vibration, and the maximum displacement at the top of structure can increase up to a few meters. Occurrence of low frequency vibration causes a fear of operators and it deteriorates awfully safeness. The purpose of this report is a control of low frequency vibrations only above-mentioned with a development of small-lightweight SMA actuator which can control a big displacement and that of control system which guarantees a stable control. When SMA material is, however, used as an actuator for the vibration control, problems may arise such as (1) show response, (2) difficulty in temperature control, and (3) one-way deformation. Using the SMA actuators designed in consideration of SMA/matrix interfacial strength and above mentioned problems, the vibration suppression for 2-meter composite beam was successfully done both for the first mode (0.75 Hz) and for the second mode (4.9 Hz). Adaptive feedforward control system is designed here for this actuator taking advantage of SMA material. As a result, control effect on beam structure is demonstrated experimentally.
| Original language | English |
|---|---|
| Pages (from-to) | 137-148 |
| Number of pages | 12 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 4946 |
| DOIs | |
| Publication status | Published - 2002 |
| Event | Transducing Materials and Devices - Brugge, Belgium Duration: 2002 Oct 30 → 2002 Nov 1 |
Keywords
- Active actuator
- Adaptive feedforward control
- CFRP
- Modal control
- PVDF modal sensor
- Shape memory alloy
- SMA moment actuator
- Temperature control
- Vibration control