Aircraft On The Surface Of The Gap, The Scattering Analysis Of The Flap And Reduce The Rcs Design

The aircraft radar section analysis is in the stealth technology domain the extremely important basic research, the various countries all invests the massive manpower physical resource into this aspect research. But the airplane surface has various influence airplane stealth performance the factor, on the airplane surface the aluminum (titanium) the alloy outer covering encircles the two-dimensional slit which forms and examines the three dimensional slit which the machinery repair opercule forms possibly to backward RCS (radar to scatter cross-sectional area) to have the big contribution, studies these slits the RCS computational method and the reduced backward RCS design has the important practical value.Two gap models are finite element - boundary integral method. In order to close the application, made creative use of absorption film on the gap patch, not just the commonly used filling gaps with absorbing coating method, it has easy to implement and easier than the paint exchange, and many other advantages. To make a certain comparison of two methods of two-dimensional crack patch method using absorbing film, and I covered three-dimensional gap is filled with absorbing coating method.Absorbing film method for using two-dimensional cracks for partition and encoding, using the finite element method gives the formula gap within the field, the boundary integral representation of external field gap. Mouth continuity of the tangential field condition of the gap and the gap within the field of the external field, to form a FEM + BI (finite element - boundary integral method) equations, by direct method to solve the export side edge field. I cover three-dimensional absorbing coating gap is filled by the method, in the subdivision, coding and other issues more complex and require more time to deal with. Focus on solving the sparse banded matrix storage, such as Green's function singularity problem.In order to effectively improve the performance gap stealth, through the technology of patch width and thickness of the coating material, selection of suitable electromagnetic parameters of materials, multiple layers of materials and design, materials from a variety of methods to be realized. Using C + + computing language preparation procedures. Can process qualitative analysis of various factors on the stealth performance gap is continuously adjusted in the program the width, thickness and electromagnetic parameters to achieve optimization. Adjustments are calculated for each relevant results first, and then prepared into a curve, comparing the results of the literature, that these two methods the model is correct. Above the actual work done has the strong guidance.