Suppression of wind-induced responses of structures by using plasma actuators | |
| Author | Thanathip Klinfueang |
| Call Number | AIT Thesis no.ST-21-18 |
| Subject(s) | Plasma accelerators Wind-pressure Structural dynamics Actuators |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-21-18 |
| Abstract | The wind flow through the structure causing the pressure change on the structure surface resulting the along-wind (drag) force, across-wind (lift) force and torsion acting on the structure body. If the wind forces-induced excessive structural responses, severe damage can occur to the structures. Therefore, the structural responses have to be controlled. There are some existing response control methods to suppress the structure response, whereas there are some disadvantages to use them. Thus, the new method, called plasma actuator devices, become interested. The device creating the plasma used in this study called dielectric barrier discharge (DBD) plasma actuator. This device produces the ionic wind disturbing the airflow around the structure, and suppressing the force acting on the structure body. There are two schemes, including co-flow and cross flow scheme, of using the DBD plasma actuator as the flow control device. Previous studies stated that the co-flow plasma actuator scheme is not much effective when applying the wind speed over 4.9 m/s. Therefore, this study tried to explore the effects of cross-flow plasma actuator scheme on reducing the wind force and compared it to the effects on reducing wind force of the co-flow plasma actuator scheme. There were four plasma actuator configurations applied on various basic structural configurations, including circular, square, corners-rounded square cylinder model, tested in the wind tunnel to study their effects. Before starting the wind tunnel testing, the DBD plasma actuator performance was optimized by adjusting the DBD plasma actuator parameters in order to generate the uniform plasma formation, not destroying any part of the device, and giving the highest ionic wind-induced body force. The results stated that all plasma actuator configurations have the most effective of reducing the mean drag force on the corners-rounded square model, followed by the circular model and the least effects on the square model. In the case of the PSD peak lift force, all plasma actuator configurations have the most reduction on the circular model and the least effect on the square model. Moreover, the performance of each plasma actuator configuration was compared among plasma actuator schemes, and the results stated that the co-flow plasma actuator scheme is more effective in reducing the mean drag force than the cross-flow plasma actuator scheme, whereas the cross-flow plasma actuator scheme is more effective than the co-flow plasma actuator scheme in case of PSD peak lift force |
| Year | 2021 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-21-18 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai; |
| Examination Committee(s) | Punchet Thammarak;Anwar, Naveed; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2021 |