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- 저자 : M.A. Soria (검색결과 2 건)
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José M. Soria,Ivan M. Díaz,Jaime H. García-Palacios 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.20 No.5
This paper explores different vibration control strategies for the cancellation of human-induced vibration on a structure with time-varying modal parameters. The main motivation of this study is a lively urban stress-ribbon footbridge (Pedro Gómez Bosque, Valladolid, Spain) that, after a whole-year monitoring, several natural frequencies within the band of interest (normal paring frequency range) have been tracked. The most perceptible vibration mode of the structure at approximately 1.8 Hz changes up to 20%. In order to find a solution for this real case, this paper takes the annual modal parameter estimates (approx. 14000 estimations) of this mode and designs three control strategies: a) a tuned mass damper (TMD) tuned to the most-repeated modal properties of the aforementioned mode, b) two semi-active TMD strategies, one with an on-off control law for the TMD damping, and other with frequency and damping tuned by updating the damper force. All strategies have been carefully compared considering two structure models: a) only the aforementioned mode and b) all the other tracked modes. The results have been compared considering human-induced vibrations and have helped the authors on making a decision of the most advisable strategy to be practically implemented.
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Joel M. Silva,R. Trujillano,V. Rives,M.A. Soria,Luis M. Madeira 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
A potassium impregnated magnesium–aluminum–gallium hydrotalcite, aged under microwaveirradiation (K-HTCGa MW), was tested for CO2 capture during a long term breakthrough experimentalcampaign. Higher total pressures, CO2 concentrations in the feed and temperatures resulted in higheroutstanding sorption capacities. The presence of H2O was considerably advantageous for increasing theCO2 capture. Finally, it was observed that higher total pressures, temperatures and H2O contents allowedhigher bed usage efficiencies. EDS elemental distribution mapping showed that potassium and galliumwere mobilized towards the sorbent surface under wet conditions, which could have contributed to theenhanced behavior of the sorbent under such conditions.
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