Active blowing control device for vibration damping and protection with cylindrical structure

Abstract

The invention discloses an active blowing control device for vibration-attenuation protection of a cylindrical structure. The active blowing control device comprises one or more groups of front and back blowing stagnation points, an air guiding pipe and blowing equipment, wherein the blowing equipment is connected with the air guiding pipe, the air guiding pipe is connected with the front and backblowing stagnation points, respectively and is arranged in the cylindrical structure, one or more groups of front and back blowing stagnation points are respectively symmetrically distributed on a windward side and a leeside, each group of front and back blowing stagnation points are located on the same section, and the blowing directions of the front and back blowing stagnation points are parallel with the direction of an incoming flow; the incoming flow acts on an aerodynamic contour formed by airflow blowing from front stagnation points; and airflow blowing from back stagnation points is capable of breaking a vortex in a tail flow so as to preventing the tail flow from forming alternate-falling vortexes. The active blowing control device is simple in structure, the alternately generated vortexes in the tail flow can be broken, and the formation of tail flow vortexes can be prevented; and meanwhile, a flow field on a cylindrical surface is changed, so that the aerodynamic force on the surface of the cylindrical structure is reduced to a certain degree, and the wind-induced vibration of the cylindrical structure can be well reduced.

Description

technical field [0001] The invention relates to a structural wind-induced vibration control technology, in particular to an active air blowing control device for vibration reduction and protection with a cylindrical structure. Background technique [0002] Cylindrical structures are widely used in today's society. For example, the cross-section of chimneys in power plants, metallurgical plants and heating exhaust in Northeast China is mostly circular. Especially the stay cables in long-span bridges or the slings of suspension bridges are all cylindrical. The span length of these results is relatively long, so the structure becomes softer, the damping becomes smaller, the wind load is more sensitive, and the wind and wind effects will be more complicated. In particular, the wind effect of cable-stayed cables of long-span bridges is one of the most prominent dynamic effects of long-span bridges at present. How to reduce the wind load and the wind effect caused by wind load is...

AI Technical Summary

Problems solved by technology

Such as: traveling wave wall, the disadvantage is that it is towering, and the applicability of slender structure is not strong, etc.

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