Method and system for antenna structure optimization design

A system for antenna structure optimization design, comprising:

• a first determination module;
• a second determination module;
• an extraction module;
• a third determination module;
• a first establishment module;
• a second establishment module;
• and
• an optimization design module;
• wherein the first determination module is configured, according to installation requirements, to determine a structure model corresponding to a composite phased-array antenna;
• the second determination module is configured to set a structural strength limit and an electrical performance design limit of the composite phased-array antenna as a design constraint, and to determine a design indicator of the design constraint and a reliability requirement thereof, so as to obtain a limit state space based on the design constraint;
• the extraction module is configured to extract design parameters of the composite phased-array antenna based on a structural model, wherein the design parameters comprise a deterministic design parameter and a random design parameter;
• the third determination module is configured to determine a noise parameter of the composite phased-array antenna that follows a random probability distribution, wherein the noise parameter is related to the design constraint, and comprises a prepreg ply orientation, a single-ply prepreg thickness and variations of antenna unit mounting points on an antenna unit mounting plate;
• the first establishment module is configured to establish a relationship between the design parameters and an optimization object, and the design constraint based on the structural model, to establish a relationship between the noise parameter and the optimization object, and the design constraint based on the structural model, and to establish a surrogate model based on the two relationships, wherein the optimization object is to minimize a structural weight of the composite phased-array antenna;
• the second establishment module is configured, based on the noise parameter and the optimization object, to establish a reliability optimization model with the design parameter as a variable and the limit state space as an optimization constraint;
• and
• the optimization design module is configured to perform reliability-based optimization design on a structure of the composite phased-array antenna to determine a target solution that satisfies the design constraint and characterizes the design parameter;
• wherein the structure of the composite phased-array antenna comprises the antenna unit mounting plate and a truss structure;
• the antenna unit mounting plate is provided with a plurality of antenna unit mounting holes in an array distribution;
• the plurality of antenna unit mounting holes are configured to mount an antenna unit array;
• the truss structure is formed by joining a plurality of hollow carbon fiber square tubes;
• and a metal embedded part is provided at a joint between two adjacent tubes of the plurality of hollow carbon fiber square tubes;
• and
• the design indicator of the structural strength limit comprises a maximum von Mises stress, a maximum shear force of a composite core material, a maximum strain of a composite skin, a Tsai-Wu coefficient and a buckling eigenvalue corresponding to rod or panel buckling failure;
• the electrical performance design limit is configured to characterize an overall electrical performance of the composite phased-array antenna;
• and the design indicator corresponding to the electrical performance design limit comprises a radiation pattern, a pointing angle deviation, a gain loss and a sidelobe level increase.