Dynamic analysis and vibration reduction control for bridge tower with MTLD under wave action

A methodology is presented in this paper which illustrates how model-based dynamic analysis coupled with Robust Design techniques can be used to minimize the longitudinal vibration levels of the step chain in a sprocket-driven escalator system. A 60-DOF mechanical dynamic model of the escalator is developed and validated as a predictor of the tonal vibration levels as a function of escalator payload and running direction. The Taguchi method is then applied to this developed physics-based analytical model to identify critical to quality (CTQ) factors, flow requirements, and optimize performance (i.e., minimize vibration) using a response surface analysis. This methodology was verified as experimental measurements of the re-designed escalator show that the optimized design effectively suppresses the structural vibration levels.

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Dynamic analysis of vibration reduction and energy harvesting using a composite cantilever beam with Galfenol and a nonlinear energy sink

International Journal of Applied Mechanics ◽

10.1142/s1758825121500897 ◽

2021 ◽

Author(s):

Ye-Wei Zhang ◽

Chuan-Qi Gao ◽

Zhen Zhang ◽

Jian Zang

Keyword(s):

Energy Harvesting ◽

Dynamic Analysis ◽

Cantilever Beam ◽

Vibration Reduction ◽

Nonlinear Energy Sink ◽

Energy Sink ◽

Nonlinear Energy

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An approximate method for dynamic analysis of offshore structures to wave action

Engineering Structures ◽

10.1016/0141-0296(90)90017-m ◽

1990 ◽

Vol 12 (2) ◽

pp. 120-123 ◽

Cited By ~ 4

Author(s):

M.T. Chang ◽

C.C. Tung

Keyword(s):

Dynamic Analysis ◽

Approximate Method ◽

Offshore Structures ◽

Wave Action

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Comparison of Taut and Catenary Mooring Systems for Finfish Aquaculture

Volume 6: Ocean Space Utilization ◽

10.1115/omae2018-78261 ◽

2018 ◽

Author(s):

Adam A. Turner ◽

Dean M. Steinke ◽

Ryan S. Nicoll ◽

Patrik Stenmark

Keyword(s):

Dynamic Analysis ◽

Wave Action ◽

Mooring Line ◽

Mooring Lines ◽

Tidal Elevation ◽

Salmon Farm ◽

Elevation Changes ◽

A Chain ◽

Finfish Aquaculture ◽

Line Loads

Finfish aquaculture has been expanding in areas like Norway and Canada over the last 20 years, and is projected to expand further in the next decades as the planet’s population and demand for seafood increases. Finding appropriate salmon farm sites is becoming increasingly difficult, as there are fewer protected nearshore locations available for development. As a result, there is interest in increased utilization of existing leases (i.e. permitted sites). These leases have a boundary in which the anchors and mooring lines must be contained. Reducing the footprint of the mooring arrangement will allow for an increased utilization of existing leases. A possible method to reduce the footprint of a spread moored salmon farm is to use a taut mooring rather than a chain catenary mooring. This requires the use of mooring materials and components that allows for handling of tidal elevation changes and wave action. This paper investigates the performance of a taut moored configuration with integrated Seaflex elastomeric mooring components in comparison with a conventional chain catenary configuration using dynamic analysis. The results show that a reduced footprint taut mooring configuration with integrated elastomeric mooring components can be substituted for a typical chain catenary mooring with no significant increase in peak mooring line loads at extreme sea states and significant reduction in peak loading at moderate and calm seastates.

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