Aerospace support scale model lightweight design and micro-deformation measurement method based on similarity theory

Abstract

The invention discloses an aerospace support scale model lightweight design and micro-deformation measurement method based on a similarity theory, and relates to the related technical field of structure optimization and measurement, and the method comprises the following steps: determining an optimization design domain and a load constraint according to a structure assembly relation; pre-processing the design domain by using a finite element thought, and setting an optimization objective function and structure size process parameters; obtaining a main force transmission path of the structure through topology, and carrying out linear fitting on a configuration boundary; by means of mechanical simulation analysis, determining an optimized size variable of the configuration and performing iteration; when it is judged that the performance requirements are met, establishing a scaling model by using a similarity theory and carrying out redundancy processing; furthermore, a physical experiment platform is built to measure the micro-deformation of the model so as to finally guide the design of a structure meeting engineering requirements. The invention provides a design thought of completing a structure lightweight design and building a scale model experiment platform by using an optimization algorithm in the field of aerospace high standards, and the requirement of high reliability of a design result is met.

Description

technical field [0001] The invention relates to the relevant technical field of structure optimization and measurement, in particular to a lightweight design and micro-deformation measurement method for a scaled model of an aerospace support based on similarity theory. Background technique [0002] With the increasing complexity of aerospace products and limited by the launch weight of spacecraft, higher requirements are put forward for the structural mechanical properties of aerospace products, especially how to realize the weight limit of non-core functional components of the structure, Find the optimal structural form that meets the requirements. At the same time, in view of the high reliability requirements of aerospace products, the designed structure needs to be verified by physical experiments. Specifically for the design of the aerospace support structure, the design requirements are put forward for the displacement and deformation of the center of mass of the space...

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Problems solved by technology

[0004] At present, in the design and measurement of aerospace structures, for example, the application number CN201710225269.3 "Star-rocket integrated multifunctional structure aircraft for ground simulation" integrates multiple loads in a limited space to achieve deep integration of the structure, but it only Starting from the load layout method, the system structure is made more compact and the redundant volume is reduced, and the performance of the aircraft is not further improved by means of simulation optimization. Carrying out effective physical experiments compared to the model can obtain the mechanical properties of the full-scale model, better guide the revision of the actual engineering structure design and verify the reliability, but only put forward similar theories without elaborating the physical measurement methods of the scale model, such as micro-deformation How should the measurement be realized (micron-scale deformation after scaling)

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