Method for building uniform-thickness quadric surface optical hood finite element model in ANSYS

Abstract

The invention discloses a method for building a uniform-thickness quadric surface optical hood finite element model in ANSYS. The method comprises the following steps that 1, a quadric curve equation is determined and converted into a function form; 2, an independent variable is selected according to the open direction of the model to be built, and the range of the independent variable is determined; 3, key points of density distribution are built based on an APDL compiling loop command; 4, BSPLINE commands are used for forming preliminary splines based on APDL; 5, line segment fusion is carried out on the preliminary splines in the step 4; 6, the fused line segments in the step 5 are connected to form a plane; 7, mesh generation is carried out on the plane formed in the step 6; 8, the finite element model formed in the step 7 is rotated. According to the method, the problem that a quadric surface model is hard to directly build in the ANSYS is solved, and compared with the process of directly adopting user interfaces for analysis, the defects that problems of the same kind are loaded many times, trouble is caused, manpower is consumed, and errors easily happen are overcome.

Description

technical field [0001] The invention belongs to the field of aero-optical effect research, and relates to a method for establishing a finite element model of an ANSYS medium-thickness quadratic surface optical head cover. Background technique [0002] With the rapid development of science and technology, research has found that the quadric surface optical hood of the aircraft has lower resistance and better imaging quality than the spherical hood in the complex aerodynamic and thermal environment, so in-depth research on its aerodynamic performance is important for guiding the aircraft hood The shape design of the model is of great significance, and it also provides data support for the simulation analysis of the external flow field of the high-speed aircraft and the light transmission of the hood under the aerodynamic thermal environment, and the calculation of the thermal radiation of the hood. [0003] Under the aerodynamic thermal environment, the shape and optical prope...

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Problems solved by technology

[0005] In order to solve the problem that it is difficult to directly establish a finite element model of a quadric surface of equal thickness in ANSYS, the thermal structure coupling calculation of the quadric surface optical head cover will be from the solid model to the establishment of the finite element model, the loading of thermodynamic boundary conditions and to The realization of the overall thermal-structure coupling calculation can be carried out in ANSYS without the need to use other solid model building software. The invention provides a method for building a finite element model of an ANSYS medium-thickness quadric surface optical hood

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