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Taking the natural wind, vehicle and bridge as an interaction system, a three-dimensional analytic model for the wind vehicle bridge coupling vibration system is presented.
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When vehicles are driven through a long-span bridge, the complex dynamic interactions among wind, vehicles and the bridge significantly affect not only the safety of the bridge members, but also passing vehicles.
The models of wind, vehicles and bridge are presented with wind velocity fluctuations simulated using the simplified spectral representation method, with vehicles modeled as mass spring damper systems, and with bridge represented by a finite element model.
Preliminary measurements showed that wind and vehicle effects could be treated separately (to first order) because vehicle induced forces are related to the instantaneous pressure field generated by the vehicle motion rather than due to air movement.
The repeatability of the tests is verified by the cases with different wind and vehicle speeds.
The results presented form part of a wider study, which included the wind and vehicle induced effects on flat plates in the atmospheric boundary layer.
It is shown that the nature of the loading on the plate is crucially dependent upon the distance from the traffic stream and the relative wind and vehicle speeds.
He backed the development of the Greenbird to smash the land speed record for a wind powered vehicle.
For the political scenario, given that the potential for modernization of heating technologies is already partially depleted, the most attractive energy saving measures are wind energy, vehicle improvements, or a modal switch towards rail for freight transport.
The aim of the present study was to further support this claim by showing linkages between wind (the vehicle of aeroplankton) and cholera-spreading patterns.
One of those includes Richard Jenkins, the designer of Greenbird, a wind-powered vehicle that broke the land speed record for the fastest wind-powered vehicle in 2009.
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CEO of Professional Science Editing for Scientists @ prosciediting.com