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Non-Linear Control of Long, Flexible Structures Employing Inter-Modal Energy Transfer [Modal Damping]

May, James E.
http://rave.ohiolink.edu/etdc/view?acc_num=akron1247711518

Abstract Details

2009, Doctor of Philosophy, University of Akron, Civil Engineering.
In the not too distant past, the design philosophy for tall civil structures could be summarized as LARGE MASS-LARGE STIFFNESS. The information age has brought about advances in material science and design technologies that provide the means to explore and construct high-reaching, expansive and much lighter-duty geometries. Current design trends require not only extensive strength-based engineering, but also carefully executed motion-based analysis. Tall, flexible civil structures have long been known to be prone to low frequency transverse vibrations. To further complicate matters, the associated natural damping properties are small leading to drawn out settling times. Motion-based augmentations offer enabling solutions. This research develops, evaluates and demonstrates a modal-based motion control strategy that may be viable for a select grouping of flexible structures. ‘Modal Damping’ exploits damping mechanisms inherent in structures by capitalizing on distinctive dynamic properties existing among the structures vibration modes. An automated, non-linear control scheme was developed to transfer energy from the fundamental vibration mode, where most vibration energy of the civil structures of interest resides, to higher order modes where vibration impedance was shown to be more effective. To achieve this objective, Modal Damping employs motion control forces self-powered by the redistribution of fundamental mode kinetic energy making the strategy highly efficient. The Modal Damping concept was developed and analyzed via dynamic simulation. The analytical findings were then applied to design an experimental model that was constructed and utilized to conduct a concept demonstration and evaluation.
Craig Menzemer, PhD (Advisor)
313 p.
Civil Engineering; Engineering; Systems Design
structural vibration control; non-linear; modal damping; modal energy transfer; tall flexible structures

Recommended Citations

Citations

  • May, J. E. (2009). Non-Linear Control of Long, Flexible Structures Employing Inter-Modal Energy Transfer [Modal Damping] [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1247711518

    APA Style (7th edition)

  • May, James. Non-Linear Control of Long, Flexible Structures Employing Inter-Modal Energy Transfer [Modal Damping]. 2009. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1247711518.

    MLA Style (8th edition)

  • May, James. "Non-Linear Control of Long, Flexible Structures Employing Inter-Modal Energy Transfer [Modal Damping]." Doctoral dissertation, University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1247711518

    Chicago Manual of Style (17th edition)

akron1247711518
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© 2009, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.