A DEMONSTRATION OF ADAPTIVE LEAST-MEAN-SQUARE CONTROL OF SMALL AMPLITUDE VORTEX-INDUCED VIBRATIONS
✍ Scribed by S. Poh; A. Baz
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 407 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0889-9746
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✦ Synopsis
Small amplitude vortex-induced vibrations of flexible cylinders are controlled using a robust adaptive Least Mean Square (LMS) algorithm . The algorithm , with its adaptive control capabilities , provides an excellent means of rejecting the ef fect of the periodic vortex-induced excitations which act persistently on the flexible cylinders . It is also capable of accommodating a considerable amount of uncertainty of the structural parameters of the vibrating cylinders . The LMS control action is developed using a hot-wire anemometer placed in the wake of the cylinder to generate a reference signal which is indicative of the vortex-shedding excitation . The resulting signal is manipulated and fed forward to minimize the structural vibration at critical locations . In this manner , the LMS method presents a simple yet powerful alternative to classical control methods or disturbancecounteracting laws . The ef fectiveness of the LMS controller in suppressing small amplitude vortex-induced vibrations of flexible cylinders is demonstrated experimentally at various flow conditions . The ef fect of the design parameters of the LMS controller on its performance is also investigated . The results obtained emphasize the potential of the LMS method as an ef fective and robust means for attenuating undesirable vortex-induced vibrations .