Actuation of Long Flexible Cables Using Ciliary Vibration Drive

2010 ◽  
pp. 177-188
Author(s):  
Masashi Konyo ◽  
Satoshi Tadokoro
Keyword(s):  
Flexible Cables

scholarly journals Optimal energy harvesting from vortex-induced vibrations of cables

2016 ◽  
Vol 472 (2195) ◽  
pp. 20160583 ◽  
Author(s):  
G. O. Antoine ◽  
E. de Langre ◽  
S. Michelin
Keyword(s):  
Energy Harvesting ◽  
Flow Velocity ◽  
Passive Control ◽  
Optimal Harvesting ◽  
Control Mechanisms ◽  
Wake Oscillator ◽  
Vortex Induced Vibrations ◽  
Harvesting Systems ◽  
Gradient Based ◽  
Flexible Cables

Vortex-induced vibrations (VIV) of flexible cables are an example of flow-induced vibrations that can act as energy harvesting systems by converting energy associated with the spontaneous cable motion into electricity. This work investigates the optimal positioning of the harvesting devices along the cable, using numerical simulations with a wake oscillator model to describe the unsteady flow forcing. Using classical gradient-based optimization, the optimal harvesting strategy is determined for the generic configuration of a flexible cable fixed at both ends, including the effect of flow forces and gravity on the cable’s geometry. The optimal strategy is found to consist systematically in a concentration of the harvesting devices at one of the cable’s ends, relying on deformation waves along the cable to carry the energy towards this harvesting site. Furthermore, we show that the performance of systems based on VIV of flexible cables is significantly more robust to flow velocity variations, in comparison with a rigid cylinder device. This results from two passive control mechanisms inherent to the cable geometry: (i) the adaptability to the flow velocity of the fundamental frequencies of cables through the flow-induced tension and (ii) the selection of successive vibration modes by the flow velocity for cables with gravity-induced tension.

Seismic Analysis of Weightless Sagging Elasto-flexible Cables

2014 ◽  
pp. 1543-1562 ◽  
Author(s):  
Pankaj Kumar ◽  
Abhijit Ganguli ◽  
Gurmail S. Benipal
Keyword(s):  
Seismic Analysis ◽  
Flexible Cables

Prestress Rubber Isolator and its Mechanical Properties

2010 ◽  
Vol 163-167 ◽  
pp. 4405-4414 ◽  
Author(s):  
Li Hua Zou ◽  
Kai Huang ◽  
Wei Zhang ◽  
Yu Rao ◽  
Li Yuan Wang
Keyword(s):  
Mechanical Properties ◽  
Seismic Isolation ◽  
Patent Application ◽  
Horizontal Displacement ◽  
Vertical Deformation ◽  
Calculation Formula ◽  
Isolation System ◽  
Chinese Patent ◽  
Flexible Cables ◽  
Rubber Isolator

A new seismic isolation system,namely the prestress rubber isolator(PRI,Chinese patent application number:200910174415x),is introduced.The basic principle of this new isolator is: making all or part of vertical deformation of isolator be finished in advance by exerting a longitudinal pre-compressional stress on the rubber isolator with flexible cables, the prestress tension cables become loose because of unloading after the exerting of superstructure loads,and the loose cables can limit the horizontal displacement and resist the tension of isolator. The calculation formula of horizontal stiffness of isolator is derivated,and the mechanical properties are researched. The research results show that:besides the horizontal isolating property of common rubber isolators,the prestress rubber isolator has also properties of reducing vertical deformation, limiting horizontal displacement and resisting tension.Moreover,the prestress isolator has also a certain vertical isolating affect because of the improve of rubber thickness.

Sign in / Sign up

Export Citation Format

Share Document