Dynamics optimization method for vibration reduction of large-scale trusses

Abstract

The invention discloses a dynamics optimization method for vibration reduction of large-scale trusses. The method comprises the following steps of: establishing a finite element model; carrying out modal analysis and transient dynamics analysis on the established model; analyzing each order of modal energy according to a modal energy method, intercepting several orders of modals which occupy relatively large energy, and analyzing a vibration mode to determine a weak link; aiming at the weak link, improving structural dynamic stiffness through adding a beam, carrying out optimal design on the added beam by taking quality minimization as a design target, taking allowable stress and structural oscillation amplitude of steel as constraint conditions and taking a sectional dimension as a designvariable; and establishing an optimized finite element model, and carrying out dynamics analysis to verify effectiveness of the dynamics optimization. Compared with the prior art, the method has theadvantages that added mass caused to structure by structure optimization is small, the structure complexity is not increased, and strength and dynamic stiffness analysis are finally carried out to ensure favorable dynamics performance and statics performance of trusses.

Description

technical field [0001] The invention belongs to the technical field of microwave anechoic chamber measurement, and in particular relates to a dynamic optimization method for large-scale truss vibration reduction. Background technique [0002] An ideal measurement site for an antenna is free space where a uniform plane wave illuminates the antenna under test. However, the electromagnetic environment in modern cities is deteriorating day by day. It is very difficult to build an ideal antenna measurement site in and around modern cities full of tall buildings. The construction of a microwave anechoic chamber is an ideal choice. It can not only prevent the interference of external waves, but also prevent the signal generated by the test system from radiating outward, and can achieve indoor measurement under conditions that are relatively close to free space. Therefore, the emergence of microwave anechoic chamber provides convenient conditions for antenna research and antenna me...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a large-scale truss vibration damping dynamics optimization method, aiming to solve the problems of low precision and low dynamic stability caused by large-scale truss vibration

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