新舟飞机雷达罩蜂窝夹层进水和电性能研究

INVESTIGATION ON THE HONEY COMB CORE SANDWICH WATER INTAKE AND ELECTRICAL PERFORMANCE OF MA60 AIRCRAFT RADOME

新舟飞机雷达罩位于机身最前端,是采用手工湿法糊制的一种蜂窝夹层玻璃钢,不仅是具有电磁透波功用的功能件,同时又是容易受损的结构件,其中夹层进水就是雷达罩一种非常重要的损伤方式。结合新舟飞机雷达罩在外场使用过程中出现的各种电性能降低的故障现象,对故障雷达罩进行淋雨和浸泡模拟验证试验,通过分析对比淋雨和浸泡前后雷达罩重量和电性能指标,表明水分可以通过损伤(即使不易察觉的微小损伤)进入雷达罩夹层结构,使雷达罩电性能迅速降低。针对这些试验结果对雷达罩夹层进水、积水原因及原理进行分析,并利用雷达罩的电磁理论研究水对雷达罩电性能的影响,提出及时发现、及时处理雷达罩内外表面各种损伤情况是保证雷达罩始终具有良好电性能的关键。

Radar radome of MA60 Aircraft is situated at the front of its fuselage, and it is a GFRP with honey- comb sandwich structure which was made by hands with the treatment of wet process. The radar radome is not only a functional device with the feature of electromagnetic wave penetrating, but also a vulnerable structural device. And water-logging of the honeycomb sandwich is one of the most severe damages. This paper combined all the fault phe- nomenon of electrical performance deterioration during the usage of radar radome in MA60 aircraft in outside field, and conducted simulating experiments of raining and soaking on the defective radar. By analyzing and comparing the weights and electrical performances of the radar radome before the simulating experiment as well as after that, and we found that in those situations water could infiltrated into the honeycomb sandwich through small damages （even some subtle damages） to deteriorate the electrical performances of the radar radome in a short time. Based on these experiment results, we analyzed the reasons which cause water accumulation in the honeycomb sandwich, and with the help of electromagnet theory, we studied the harms that water did to the electrical performances of radar radome ; therefore, we concluded that dealing with all the outside and inside surface damages of radar radome is crucial for us to maintain its perfect alectrical performances.