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Design For Practice |
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Northern Arizona University |
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Tuned-Mass Damping |
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Another area of research to consider for implementation is a tuned mass system where a single frequency or a range of frequencies can be target at multiple points on a structure. As the weight ratio of mass and structure increase, the range of damping increases as well as the maximum decay rate. Also, the tuned mass dampening system can target frequencies that the constrained layer damping noted previously cannot. Another aspect to consider is the ability to increase the effective range by using multiple tuned mass dampeners. To increase the effective range, the weight is divided amongst the springs keeping the loss factor the same between each sub-system and by not overlapping the frequency range of each spring. Caution was mentioned about dividing the mass too many times as each time the mass division increases, the amplitude reduction decreases.
We ended up implementing a damper similar to a tuned mass damper, we found a material called Sorbothane. Sorbothane is used for vibration damping and isolation for a wide degree of ranges (-20F to 160F). The material also through testing proved to dampen wide ranges of frequencies.
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Continuous Tuned-Mass Damping |
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Example of Tuned Mass Damper (Stockbridge) |
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Rao, Singiresu S. Fourth Edition Mechanical Vibrations. New Jersey: Pearson Education Inc., 2004. |