Residual vibration reduction in low damping systems. Generation of regular piecewise algebraic polynomial inputs
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Data publicació2011-12-31
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Abstract
This paper presents a feedforward technique to generate command inputs to reduce
residual vibration after transient maneuvers in mechanical systems. Synthesized inputs base
their vibration reduction in zero-frequency content at the system resonances and are obtained
taking advantage of the convolution theorem of the Fourier transform (FT). The analyzed
systems are those that can be modeled as discrete linear systems with n vibratory degrees-offreedom,
and can be described with constant parameter motion equations. Although the
complete cancellation of residual vibrations occurs for null damping ratios, the results obtained
for low damped systems are quite acceptable. The method is particularized for rest-to-rest
maneuvers and is compared to other literature methods. The new profiles present an optimal
shape in terms of minimum acceleration fluctuation, which is useful to reduce the fatigue
strength of the mechanical parts. By using a pulse as a base signal, the inputs obtained follow
piecewise algebraic polynomial functions easily implementable through a B-spline scheme. The
development includes a robust approach against the variation of the system parameters and a
constraint determination aid for symmetric functions. Finally, some experimental results are
presented using a two vibratory degrees-of-freedom test bed.
CitacióVeciana, J. M.; Cardona, S. Residual vibration reduction in low damping systems. Generation of regular piecewise algebraic polynomial inputs. "Journal of Vibroengineering", 31 Desembre 2011, vol. 13, núm. 4, p. 739-754.
ISSN1392-8716
Versió de l'editorhttps://www.jvejournals.com/article/10518
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vibration_polynomial_drac.pdf | 9,940Mb | Visualitza/Obre |