Electrical performance prediction method of planar array antenna under shock wave load

Abstract

The invention relates to an electrical performance prediction method of a planar array antenna under shock wave load, including: (1) establishing a finite element mode according to the structural parameters and material properties of the planar array antenna; (2) extracting the node coordinates rn of each antenna element on the antenna radiation front; (3) defining the elasto-plastic properties of the planar array antenna; (4) loading the position constraint to the finite element model; (5) calculating the overpressure [Delta]p of the explosion shock and defining the load time history curve; (6) transforming the load time history curve into the impact load F(t) and applying the load to the finite element model, and obtaining the structural dynamic equation under the impact load; (7) solving the kinetic equation to obtain the plastic deformation of the antenna radiation surface under the shock wave load of the planar array antenna, and deriving the node position offset [Delta]rn of the front antenna element; (8) obtaining the relation of effect of the antenna plastic deformation on the far field pattern under the shock wave load.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a method for predicting the electrical performance of a planar array antenna under the action of a shock wave load, which can provide reference for the explosion-proof design of the planar array antenna structure. Background technique [0002] With the rapid development of science and technology, military electronic reconnaissance technology and equipment have developed significantly. Judging from decades of development, there has always been a struggle between radar and anti-radar. As an electromagnetic sensor system of electronic equipment, radar antenna has become an indispensable and important component of radar systems such as communication, navigation, and detection. If the radar antenna is damaged, the entire radar system will fail, so the radar antenna has become a direct target or an important target of the missile. When the missile directly attacks the radar antenna,...

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Problems solved by technology

The specific analysis results are in "Ren Xiumin. Research on the damage effect of typical phased array antennas under the action of shock waves. Beijing Institute of Technology Master's Degree Thesis, 2015." However, the article only cares about the maximum deformation of the antenna panel during the impact load process, not the load action Afterwards, the antenna is plastically deformed, so it is impossible to accurately predict the electrical performance changes of the antenna after the shock wave load

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