36results about How to "Efficient design method" patented technology

The invention discloses a sand dune-like microstructure with high-efficiency air drag reduction function on the surface and an optimization design method thereof. First, the method of computational fluid dynamics (CFD) is used to construct the transverse array of dune-like microstructure in the flow field region,. The drag reduction rate was obtained by using Reynolds average numerical simulation(RANs) and Fluent solver, and with the total pressure drop as the calculation index. Finally, the dune-like microstructure parameters with high-efficiency air drag reduction function were optimized tomeet the expected goal. Compared with the traditional biomimetic drag reduction microstructure, the dune-like microstructure design method with high-efficiency air drag reduction function provided bythe invention has the universality for different flow field states. In addition, the method provided by the invention can save the design cost, shorten the design cycle, reduce the design loss, and provide a certain reference for the aerodynamic structure design of the aircraft.

The invention discloses a scaling-theory-based design method of high-performance absorber. The method comprises: S1, on the basis of a prototype wave-absorbing material, corresponding electromagneticparameters and a corresponding prototype frequency are obtained, wherein the electromagnetic parameters include a dielectric constant and a magnetic permeability; S2, according to a reflectivity calculation theory of multi-layer materials, impedance characteristics and changing rule functions of all layers of materials are analyzed by combining the electromagnetic parameters and the prototype frequency of the prototype wave-absorbing material, thereby obtaining an impedance characteristic function; and on the basis of a scaling theory, a scaling material having the shape same as the prototypewave-absorbing material is prepared and scaling electromagnetic parameters and thicknesses of all layers of materials are theoretically designed based on the impedance characteristic parameters; S3, ascaling frequency coefficient and a shape ratio factor are determined to obtain a material prescription meeting the impedance characteristic; and S4, a needed high-performance absorber is constructedby using the material prescription. The method has the following advantage: the quick design of a broadband absorbing material is realized.