PMI泡沫夹层结构雷达天线罩间接热-结构耦合分析与实验研究

机载PMI泡沫夹层结构雷达天线罩在环境温度变化时将产生表面变形现象并影响其使用性能,但对天线罩热变形结果进行实时检测分析具有一定难度。通过ANSYS间接热-结构耦合法建立了分析模型,对天线罩进行了计算分析,采用热膨胀片状模型进行了理论分析,在此基础上,设计并开展了温度冲击实验研究。结果表明, PMI夹层结构天线罩的热-结构耦合变形综合应变趋势是棱边处膨胀程度最大,由边缘至天线罩透波面中心处,膨胀程度逐渐减小；间接热-结构耦合计算应变值与实测应变值之间平均相差35.08%,间接热-结构耦合分析方法与模型具有一定的可信性。

Thermal-structure coupling analysis and experimental investigation of the radome fabricated by PMI foam sandwich structure

The surface deformation of airborne radome fabricated by PMI foam sandwich structure will happen when environment temperature was changed and the deformation will influence the performance of the radome. However, it is difficult to detect and analyze the thermal deformation of the radome in real time. The radome was calculated and analyzed by the model, which was established by using indirect thermal-structural coupling method in ANSYS. The traditional thermal expansion flake model used to analyze the calculation result in theory. Based on the analysis, the temperature shock test was designed and carried out. Result shows that the thermal-structural coupling deformation of the radome fabricated by PMI foam sandwich structure as the comprehensive strain trend that the expansion degree is the largest at the edge and the expansion degree gradually decreases from the edge to the center of the transparent surface. The average difference between the strain value of indirect thermal-structural coupling calculation and the measured strain value is 35.08%. The value proves the certain degree of credibility of the analysis method and the thermal-structure coupling model.