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Control of low-induced vibrations using shape memory alloy wires
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kim, Jin-Hyun |
| Copyright Year | 1996 |
| Abstract | A series of experiments were performed to examine the application of shapememory wires for controlled stiffness modification of an aerodynamic body. Shapememory alloy wires were embedded in a thin epoxy plate which was employed as a flexible joint near the bluff trailing edge of a thick flat plate; two epoxy/SMA plates of thickness 2.2 rnm and 0.98 mm were manufactured and examined separately. When placed in a lowspeed water channel flow, periodic pressure loading due to vortex shedding from the trailing edge of the bluff body cause a flow-induced vibration of the trailing edge of the body. Galvanic heating of the wires is employed, which causes the "trained" wires to contract, which places a symmetrical compressive force upon the epoxy/SMA plate and should theoretically modify the plate stiffness, making it more flexible. Initial tests of the system in air indicates that use of this type of variable stiffness plate does modify the natural frequency of the plate-fluid system. However, successive tests in water suggests that the reduced stiffness of the plate was found to be of only minimal effectiveness in modifying the oscillation frequency and amplitude of the trailing edge because of dominant forcing behavior due to added mass and vortex shedding effects. Based on a simple model, calculations show that the force of the added mass of water impresses an equivalent inertial effect of 3 or 4 times the mass of the back plate itself, which suggests that the added mass is the major factor in the lack of change in frequency and amplitude response to varying stiffness. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://preserve.lehigh.edu/cgi/viewcontent.cgi?article=1403&context=etd&httpsredir=1&referer= |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
