关键词: 多尺度结构, 拓扑优化, 点阵结构, 增材制造, 中介机匣, 激光加工

Abstract: The multi-scale structure, composed of the macro skeleton, lattice and micro surface, represents a novel type of structure with potential for high performance, multifunctionality and lightweight design. Advanced laser processing technology not only enhances the manufacturing capacity of high-performance structures but also provides possibilities for the manufacturing of new complex structures. After providing a brief overview of the current design and manufacturing techniques on macro skeleton, lattice and micro surface, this paper introduces a multi-scale structure design method for advanced laser processing technology. Taking the intermediate case of a turbine engine as an example, the main load-bearing skeleton is designed using topology optimization technology for additive manufacturing. The lightweight lattice design is carried out by filling manufacturable lattice in low-density areas in topology oiptimization or low-stress areas in the optimized model, resulting in a weight reduction of over 20% compared to the original design. Additionally, micro groove structures for drag reduction are designed on the surface of the airflow channel for ultrafast laser etching processing. Simulation results indicate that the micro grooves exhibit a drag reduction effect exceeding 10%. This work explores multi-scale integrated structure design based on advanced laser processing technology. It establishes a creative structural design procedure and offers a valuable approach for the development of next-generation aeroengine structures.

Key words: multi-scale structure, topology optimization, lattice structure, additive manufacturing, intermediate case, laser Processing