Antenna model load displacement measurement method of mixed basis function

Abstract

The invention discloses an antenna model load displacement measurement method of a mixed basis function. The method comprises the steps: constructing a beam unit by using an NURBS primary function forthe beam, calculating a Bessel extraction operator of the basic unit, and coupling a beam-beam unit and a beam-shell unit; establishing and arranging a constraint equation; judging and setting a displacement coefficient matrix according to a coupling relation among different basic units; fusing the displacement constraint equation into the system stiffness matrix of the whole isogeometric model by adopting a penalty function method, establishing a corrected potential energy functional considering a penalty function, and solving the final system balance equation to obtain the displacement of the antenna control vertex. According to the method, different structural types of components of different spline basis function discrete array element antenna complex products are adopted, so that themodeling flexibility of a product model is improved.

Description

technical field [0001] The invention relates to a method for measuring the load displacement of a complex product model, in particular to a method for measuring the load displacement of an antenna model with a mixed basis function. Background technique [0002] Antennas are complex industrial products composed of various structural types, with large dimensions, including shells, beams, rods and other structures. The geometric complexity of different structures is different, and the difficulty of constructing their isogeometric models is also different. For example, the beam structure can often be simplified, and the overall physical properties can be represented by its neutral layer curve. Therefore, NURBS is sufficient to construct the isogeometric model of the beam. However, the shell structure usually cannot be described by a single NURBS or Hermite surface patch, and T-splines are more suitable for the isogeometric basis function of the shell structure. [0003] For th...

AI Technical Summary

Problems solved by technology

[0003] For the isogeometric model of antenna products composed of different structural types of components, the coupling splicing between the basic units of various structural parts (such as line elements of beam structures, surface elements of shell structures, etc.) requires additional processing, otherwise various structural parts The grid units cannot form a unified whole, and the accurate analysis of the overall displacement of the antenna model cannot be performed

The alternative method is to analyze the different structures of the antenna products separately, and use the connection point between the support structure and the reflector structure as the fixed support point of the transmitting surface structure, which limits the degree of freedom of the fixed support point and ignores the actual situation of the support structure. Deformation, which makes the displacement calculation result of the antenna transmitting surface deviate from the real value, which is not accurate enough

Images