飞机转顶基座及支架结构静力试验技术研究
On the Static Experimental Technique of Pedestal and Metal Support Used in Aerial Airplane Test

根据飞机空中试验用转顶基座及金属支架结构静力试验技术需求,研制了一套试验系统,解决了转顶基座及金属支架结构支持模拟、加载边界模拟等关键问题。对载荷进行等效处理,设计加载假件,采用载荷偏移与力偶施加相结合的方法施加力矩,分别完成了五级风载荷下4种工况的设计载荷试验和极限载荷试验,以及八级风载荷下其中第4工况的极限载荷试验。考核了结构的危险部位应力值及结构安全余量。试验结果表明,该试验系统工作稳定可靠,转顶基座及金属支架在设计载荷试验工况下未发生有害塑性变形,其强度、刚度满足设计要求。上述试验结果可作为该结构强度、刚度性能的评定依据,同时为后续结构研究的有限元建模提供数据支持。
According to the static experimental technique demand of pedestal and metal support used in aerial airplane experiment, an experimental system was designed and manufactured, which has solved several key problems, including the supporting simulation of pedestal and metal support, the loading boundary simulation etc. Based on load equivalent treatment, dummy design and applying combining moment of load shift and couple, the designed load experiment and the ultimate load experiment in wind level 5 and under 4 kinds of working condition were accomplished respectively. At the same time, the ultimate load experiment in wind level 8 under the 4th working condition among above mentioned conditions was also completed. Stress value at structure dangerous positions and structure safety margin were assessed. Experimental results show that this experimental system is stable and reliable, no irreversible plastic deformation happens during the experiment for designed load. It proves that the pedestal and metal support structure have enough strength and stiffness under working conditions. Above results may be used for structure strength and stiffness evaluation, and may offer data for building structure element model