Passive vibration
mitigation via multi-stable, mechanical means is relatively unexplored. In addition, achieving vibration suppression
through avoiding resonance is at the forefront of up and coming research. This thesis investigates the application of a
purely mechanical, bistable device as a passive method of vibration
suppression. A purely mechanical device
does not require power, multiple materials, or electrical circuits, and a
passive device does not require external interaction or control. Therefore, a passive, mechanical device could
be implemented with ease even in physically constrained environments with large
dynamic loads, such as turbomachinery.
The purely mechanical, bistable device presented herein replicates the
two switches per resonance crossing evident in semi-active Resonance Frequency
Detuning method. This work explores two
different bistable, mass-spring models.
The first is a single degree of freedom nonlinear mass spring model
aiming to utilize asymmetry in the potential function to change the stiffness
of the overall system. The second model
is a coupled, two degree of freedom system that combines the nonlinear
softening and hardening spring characteristics with the unique stiffnesses of
two stable states. The performance is verified
by targeting the first mode of a cantilever beam, with the device shifting the
resonance away from the excitation frequency.
Future research could apply these idealized models to complex, rotating
structures and replicate the performance of the passive, mechanical devices in
a physical geometry that could be manufactured as a part of a target structure.
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/8846111 |
| Date | 13 August 2019 |
| Creators | Christian Bjorn Grantz (6933833) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/Passive_Vibration_Mitigation_Via_Mechanical_Nonlinear_Bistable_Oscillators/8846111 |
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