基于碳化硅3D打印的遥感相机主承力结构设计与验证

Design and verification of main bearing structure of remote sensing camera based on SiC 3D printing

3D打印快速成型技术不断趋于成熟,其应用范围越来越广泛。碳化硅材料具有较高的弹性模量、比刚度及较好的稳定性等物理性质。为了使遥感相机主承力结构突破传统工艺和设计思路的限制,在提高轻量化程度的同时获得更好的力、热稳定性,使用碳化硅作为原材料,采用3D打印的制造方式研制主承力结构。首先介绍了碳化硅3D打印技术的优势和特点;之后,根据技术特点梳理了主承力结构的设计方法;然后依据设计方法开展了结构设计、仿真以及优化工作;最终,主承力结构外包络为400 mm×370 mm×430 mm,一阶频率为639.9 Hz,质量仅为4.2 kg,与传统方案相比减重41.6%,具有良好的力、热稳定性,满足使用要求。经过力学试验验证,符合设计预期。

The rapid prototyping technology of 3D printing is becoming more and more mature, and its application scope is more and more extensive. Silicon carbide material has excellent physical properties such as high elastic modulus, specific stiffness and good stability. In order to make the main bearing structure of remote sensing camera break through the limitations of traditional technology and design ideas, improve the light weight and obtain better mechanical and thermal stability, the silicon carbide as raw material was used and 3D printing manufacturing method was adopted to develop the main bearing structure. Firstly, the advantages and characteristics of silicon carbide 3D printing technology were introduced. Then, according to the technical characteristics, the design method of the main bearing structure was combed. Then, according to the design method, structural design, simulation and optimization were carried out. Finally, the outer envelope of the main bearing structure was 400 mm×370 mm×430 mm, the first-order frequency was 639.9 Hz, and the weight was only 4.2 kg, which was 41.6% lower than the traditional scheme. It has good mechanical and thermal stability and meets the use requirements. After mechanical test, it meets the design expectation.