Passive-Tuned Mass Dampers for the Pointing Accuracy Mitigation of VLBI Earth-Based Antennae Subject to Aerodynamic Gust

This paper proposes an optimization procedure to achieve the best configuration of multiple degrees of freedom Tuned Mass Dampers (TMDs) to mitigate the pointing error of Very-Long-Baseline Interferometry (VLBI) Earth-based radio antennae operating under aerodynamic gust conditions. In order to dete...

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Vydáno v:Applied Mechanics Ročník 4; číslo 3; s. 816 - 840
Hlavní autoři: Gasparetto, Victor E. L., Reid, Jackson, ElSayed, Mostafa S. A.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Zwijnaarde MDPI AG 01.09.2023
Témata:
Accuracy
Antennas
Davenport Spectrum
Design optimization
dynamic aeroelastic response
Efficiency
Genetic algorithms
Genetic engineering
Ground stations
multi-objective genetic algorithm optimization
Mutation
tuned discrete gust
tuned mass dampers
Variables
vibration attenuation
Wind
ISSN:2673-3161, 2673-3161
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Shrnutí:This paper proposes an optimization procedure to achieve the best configuration of multiple degrees of freedom Tuned Mass Dampers (TMDs) to mitigate the pointing error of Very-Long-Baseline Interferometry (VLBI) Earth-based radio antennae operating under aerodynamic gust conditions. In order to determine the optimum sets of TMDs, a Multi-Objective design optimization employing a genetic algorithm is implemented. A case study is presented where fourteen operational scenarios of wind gust are considered, employing two models of atmospheric disturbances, namely the Power Spectral Density (PSD) function with a statistical profile presented by the Davenport Spectrum (DS) and a Tuned Discrete Gust (TDG) modeled as a one-minus cosine signal. It is found that the optimal configurations of TMDs are capable of reducing the pointing error of the antenna by an average of 66% and 50% for the PSD and TDG gust excitation scenarios, respectively, with a mass inclusion of 1% of the total mass of the antenna structure. The optimal TMD parameters determined herein can be utilized for design and field implementation in antenna systems, such that their structural efficiency can be enhanced for radio astronomy applications.
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ISSN:2673-3161
2673-3161
DOI:10.3390/applmech4030042