31 results about "Wind engineering" patented technology

The invention provides a tornado testing device for building wind engineering. The tornado testing device can accurately simulate a wind field of a tornado and the wind load effect of the tornado on a building. The tornado testing device comprises stand columns and a motor, wherein longitudinal beams are arranged on the tops of the stand columns, the longitudinal beams are connected with transverse beams, rolling wheels are arranged on the longitudinal beams and move along the longitudinal beams, the rolling wheels are connected with supporting beams, the supporting beams are connected with a vortex generator, the motor drives driving wheels to rotate, driven wheels matched with the driving wheels are arranged on the supporting beams, a platform is arranged below the vortex generator, and the platform is arranged on a lifting device. According to the tornado testing device for the building wind engineering, the shape of vortex wind generated by the vortex generator is similar to the shape of the tornado, the wind speed and the wind direction of the vortex wind can be adjusted, the vertical distance between the vortex wind and a house model can be adjusted, the horizontal movement speed of the vortex wind can also be adjusted, and therefore the wind field of the tornados in different states and the effect of the wind load of the tornados on the building can be fully simulated.

The invention discloses a target track tracking calculation method of a wind-driven rain amount, and belongs to the technical field of wind engineering. The calculation method comprises the steps of on a given wind field incoming flow condition, solving a Reynolds average N-S equation to obtain a circle flow field of a building; according to an area to be calculated, establishing a virtual plane, and calculating a sample track end point of a sample track on the area to be calculated or the virtual plane; through a surrogate model method, and according to a sample track starting point and the sample track end point, establishing a function relation formula regarding the coordinate relation of a raindrop starting point and end point; given a raindrop track end point coordinate on the area to be calculated, calculating a raindrop track starting point coordinate; solving a raindrop motion equation to obtain an effective track, and according to the effective track, calculating collection rate distribution in the area to be calculated. According to the target track tracking calculation method of the wind-driven rain amount, accurate calculation of collection rates on the back face, lee side, the boundary and the corner point area of the building is achieved, and compared with an existing method, the needed raindrop track calculation amount is remarkably lowered.

The invention belongs to the field of computing wind engineering, and discloses an OpenFOAM-based method for simulating complex terrain surface roughness. The method comprises the following steps of 1) building a complex terrain CFD model, and generating a refined grid; 2) extracting surface roughness length data of the complex terrain CFD model, converting a surface roughness length into a surface cover vegetation height, and providing an accurate data basis for simulating an influence of a surface cover vegetation on a wind field of a complex terrain; 3) calculating resistance coefficients of the surface cover vegetation to the wind field at different heights, and then converting the surface cover vegetation height into the corresponding resistance coefficient; and 4) adding the resistance coefficient and a resistance item of the surface cover vegetation by using OpenFOAM, thereby obtaining a more accurate complex terrain wind field characteristic simulation result. A program language supported by a computer is used; the influence of the surface roughness on the wind field of the complex terrain is considered; and therefore, the numerical simulation accuracy of the wind field ofthe complex terrain is improved.

The invention discloses a wind engineering analysis method for a large-span ultra-high space grid structure, and belongs to the technical field of special engineering design. The analysis method comprises the following implementation steps of firstly, establishing a structure numerical value wind tunnel model of a spatial grid structure; secondly, obtaining a body type coefficient of the space grid structure according to the structure numerical value wind tunnel model, and calculating a wind vibration coefficient of the space grid structure according to theoretical analysis; establishing a wind load calculation working condition analysis model according to the body type coefficient and the wind vibration coefficient; calculating the mechanical properties under the action of wind load according to a working condition analysis model, judging whether the mechanical properties meet design requirements or not, if so, performing the next step, and otherwise, performing structure optimization; and finally, analyzing the whole elastic-plastic process of the structure under the working condition of wind load calculation by adopting the low-order buckling mode of the structure, and calculating the overall stability of the structure under the action of wind load. The method can replace a wind tunnel test to obtain the shape coefficient of any position under any wind direction angle effect, the test period is short, and the cost is low.

The invention relates to a method for measuring a blast time-frequency characteristic of a structure roof of a low-rise building, and belongs to the field of wind engineering. The method comprises thefollowing steps of S1) detecting the smoothness; S2) detecting the pulsated wind speed smoothness; S3) carrying out continuous and discrete wavelet transformation; and S4) analyzing the time-frequency characteristic. Thus, the blast time-frequency characteristic of the structure roof of the low-rise building is measured effectively, and determination basis is provided for construction of the structure roof of the low-rise building.

The invention discloses a method for calculating the turbulence intensity of the tail flow of a wind turbine. The method comprises the following steps: calculating a flow direction turbulence intensity vertical direction distribution type of inflow, a wake flow radius at any flow direction cross section position of a wake flow area and maximum additional turbulence intensity generated by a wake flow effect based on basic data such as inflow wind resource information and wind turbine generator characteristic parameters; calculating the additional turbulence intensity and the 'inhibition' turbulence intensity of the wake flow area position; and calculating the flow direction turbulence intensity of any position of the tail flow of the wind turbine based on the steps. According to the method, the flow direction turbulence intensity of any spatial position can be predicted with high precision, especially the 'double-peak' distribution of the near wake flow turbulence intensity and the 'turbulence weakening' effect of the near ground position, and the prediction precision is superior to that of a numerical simulation result based on computational fluid mechanics. And an accurate and efficient turbulence calculation tool is provided for wind turbine design and wind power plant unit layout optimization in a wind engineering project.

The invention provides a turbulent flow field simulation device for a structural wind engineering test. The turbulent flow field simulation device for the structural wind engineering test comprises a base, a gas outlet pipe, a gas cavity, a gas inlet and a gas pump; the gas cavity is arranged in the base; the gas outlet pipe is connected with the gas cavity and the outer side of the base; the gas pump is connected with the gas inlet; the gas inlet is connected with the gas cavity; and a test model is arranged on the base. A turbulent flow field is simulated by blasting gas flow on the lower surface of an incoming flow field, so that effective simulation of the wind field of the actual engineering structure is realized, a double-way pulsating turbulent flow field can be simulated simply and effectively, and the device is flexible in form and high in applicability and can serve as effective supplementation of the existing technical scheme.

The invention discloses a three-dimensional wind field efficient simulation method based on a delay effect, and belongs to the technical field of structural wind engineering. The method for generating the wind speed time history mainly comprises the steps of determining coordinates and an initial coordinate system of simulation points according to a structural drawing, transforming the coordinate system to enable a Y axis to be parallel to the wind speed direction, obtaining a three-dimensional model of N structural simulation points, projecting all the simulation points of the three-dimensional model to a target two-dimensional plane, converting the simulation points into projection points in a two-dimensional plane, calculating wind speed delay time, namely required time from each point to the projection points on the target plane, adopting a two-dimensional coherence function to consider spatial correlation of different simulation points in the transverse direction and the vertical direction, generating fluctuating wind speed by using a harmonic superposition method, and obtaining wind speed time histories of all the points by using the delay time. The statistical characteristics of the data obtained by the time delay method are similar to the result of the traditional three-dimensional method, but the simulation efficiency is greatly improved; and meanwhile, the method is simple to operate and has a reasonable theoretical background.

The invention belongs to the field of computational wind engineering, and particularly discloses a wind power plant fan wake flow dynamic coupling simulation method, which comprises the following steps of: S1, dividing a computational domain into a plurality of grid units, further establishing a computational domain grid model, and simultaneously obtaining relevant parameters of a fan; s2, dividing the fan actuating disc into a plurality of radially equidistant circular rings, respectively calculating axial force and tangential force corresponding to each circular ring according to the wind speed, distributing the axial force and tangential force to each grid unit contained in the circular rings to obtain a resistance item of each grid unit, and establishing a corresponding relation model of the wind speed and the resistance item; and S3, based on the computational domain grid model, carrying out numerical simulation on the fan wake flow, adding a resistance item to a corresponding grid unit during simulation, and dynamically calculating and updating the resistance item according to the changed wind speed and the corresponding relation model. The resistance item is correspondingly and dynamically added according to the incoming flow wind speed, the disturbance effect of the flow field and the draught fan on the flow field can be calculated in a coupling mode, and the wake flow distribution condition of the draught fan is truly reflected.

The invention discloses a bridge wind tunnel wind speed and vehicle force measurement test system and method, and relates to the technical field of bridge wind engineering. The system comprises a vehicle model, a wind measurement platform and a force measurement platform, wherein the wind measurement platform is arranged in the wind tunnel, comprises a wind measurement crown block and is used formeasuring wind speeds and wind directions at different positions; the force measurement platform is arranged in the bridge model and comprises a force measurement balance and a mechanical servo system, and the vehicle model is locked on the force measurement balance, so that the six-component force of the vehicle model can be conveniently collected in time in the test process; and the mechanical servo system is used for conveying and moving the force measurement balance. Through the cooperation of the wind measurement platform and the force measurement platform, the wind speed and direction ofeach lane and the corresponding vehicle model six-component force under each working condition can be continuously and synchronously acquired at any time, the frequency of adjusting the working condition and equipment by stopping a wind tunnel is reduced, the manual interference is reduced, and the test efficiency and precision are improved.

The invention discloses a high-efficiency air supply and return engineering construction method for a low-stable-speed and auxiliary-flow clean air conditioner. The method comprises the following steps that 1, a pipeline and a frame are positioned; 2, a clean room is built and cleaned; 3, the pipeline is laid; 4, an air return system is constructed; 5, an air supply system is constructed; 6, the system is debugged; and 7, overall cleaning and disinfection are performed. The construction process is reasonable in design, the construction sequence follows the principle of 'first large, second small and first inside and second outside', orderly and effective installation of the system is guaranteed, and the project constructed through the construction method can enable the diffusion speed of harmful suspended particles in the clean room to reach the minimum, so that the cleanliness in the clean room reaches the higher grade, in addition, the construction cost and the operation cost of a project constructed and completed through the method are low, and the method is more suitable for enterprise production.

The invention belongs to the technical field of communication, and relates to an overhead transmission line squall line wind load calculation method, system, medium and equipment, and the overhead transmission line squall line wind load calculation method comprises the following steps: determining a load physical model suitable for squall line wind meteorological conditions according to a fortification squall line wind power level of a planned overhead transmission line and a corresponding wind speed, the standard wind load acts on the conductor, and the squall line wind load acts on the power transmission tower; and inputting the fortified squall line wind power grades and the corresponding wind speeds into the load physical model to obtain the overhead transmission line wind load. According to the invention, reasonable evaluation of the squall line wind load of the power transmission line is realized on the basis of the basic principle of structural wind engineering and measured data of squall line wind meteorology.

The invention discloses a bridge type wind measurement system which comprises a connecting cable and a power supply assembly. The two ends of the connecting cable are connected to the two ends of a preset bridge respectively, at least one observation platform is arranged on the connecting cable, and a wind observation part is arranged on the observation platform and used for measuring high-frequency three-dimensional wind data, collecting the high-frequency three-dimensional wind data and outputting the high-frequency three-dimensional wind data. The power supply assembly is electrically connected with the wind observation part. According to the embodiment, the observation part is directly installed at the real position of the preset bridge deck through the connecting cable and the observation platform, and then the three-dimensional turbulent flow fluctuating wind speed is directly observed, so that high-frequency three-dimensional wind at the real positions of the bridge decks on canyons, valleys and rivers can be measured before the bridge is built; accurate and reliable three-dimensional wind observation data are provided for bridge wind resistance design, and the data is used for calculating bridge wind engineering parameters.

The invention discloses a wind creation device. The wind creation device comprises more than two electric potential output units, wherein different electric potential output units are arranged at a distance of 3,000-100,000 meters and are in potentials with opposite polarities. The device is mainly used in wind engineering, and is used for increasing precipitation and preventing forest fire.