某电子设备的天线罩和涂层热膨胀匹配研究

Research on Thermal Expansion Matching of Radome and Coating for an Electronic Equipment

为了提高某电子设备的天线罩在高温环境下工作的可靠性,确保涂层不脱落,文中结合工程实际,利用ANSYS建立参数化有限元模型,对天线罩及表面涂层进行瞬态分析及热-结构耦合分析,得到天线罩温度与时间的关系及涂层粘接面剪切应力与时间的关系。根据涂层发生脱落时的最大剪切应力对涂层的热膨胀系数进行参数化编程计算,确定了涂层的热膨胀系数范围,为选择匹配的天线罩涂层提供了理论依据,保证涂层在一定温度与一定时间内不开裂脱落。

In order to improve the functional reliability of the radome of an electronic equipment in high-tem- perature environment and ensure that coating will not shed, this paper creates parametric finite element model by ANSYS and carries out transient state analysis and thermal-structural coupling analysis for radome and coating with engineering practice considered. Relationships between radome temperature and time, shearing-stress of bonding surface of coating and time are obtained. Based on the maximum shearing-stress of coating when it is shedding, the coefficient of thermal expansion is calculated by parametric programming and its range of val- ue is determined. It provides theoretical foundation for choosing matching radome coating and make sure that coating will not shed and split in certain temperature range and certain period of time.