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Design For Practice |
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Northern Arizona University |
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Magnetic Shunt Damping |
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The next area of research put into smart materials (SMA’s) and their applicableness to the BBC. A smart material that showed high dampening properties was a shape memory alloy Copper Aluminum Nickel (Cu- Al-Ni) composite. Another shape memory alloy is one that is formed by Nickel Titanium (Ni-Ti); however, the Copper Aluminum Nickel composite SMA is more feasible in cost. (Lopez) The CU-Al-Ni SMA in Figure 3 displays dampening behaviors through a substantially wide range and experiences dampening higher than 0.5 at certain temperatures. Noting that 275K is approximately 72F we can see that high dampening, internal friction, spanning all temperatures experienced in Flagstaff.
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Design Concepts |
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SMA Cu-Al-Ni graph of internal friction and temperature showing damping capabilities of smart material |
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Another benefit is that the SMA reduces low frequencies or the frequencies that other methods have a harder time compensating for. This technology has limited practicality because the material is not structural member worthy. The smart material can be implemented at joints instead. |
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Lopez, Gabriel A., et al. “Cu-Al-Ni-SMA-Based High-Damping Compsites.” Journal of Materials Engineering Performance 18.5 (2009): 459-462. Compendex. Web. 11 Nov. 2009. |