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中文摘要：
在基于飞参数据的飞机重心过载试验谱编制过程中,载荷分级和周期减缩共同作用可能造成部分载荷循环丢失。这些丢失的循环一般幅值较大,来自严重飞行载荷,其取舍对机体结构损伤影响严重,应当采取必要措施予以弥补。在研究两种诱因对循环丢失影响的基础上,提出一种长短周期相结合的试验谱制作方法：先用平均单次飞行时间制作基本周期谱块,并参照严重载荷出现规律确定长周期,依据长周期进行周期延拓制作出延拓谱,再用延拓周期进行一次减缩,从而找回绝大部分丢失的载荷循环,以合理的方式添加到延拓谱中,构成加速试验周期谱块。该方法不仅较好地解决了试验谱制作过程中出现的载荷循环丢失问题和加载周期长短难以兼顾的矛盾,计算结果还表明,该方法得到的谱损伤与原谱损伤的误差在可接受范围内,优于一般的试验谱块。
英文摘要：
During g-factor spectrum compiling of aircraft cg based on flight data,part cycles maybe disappear.This is a serious problem because most of these disappeared cycles have high amplitude and originally belong to serious loads,which are significant for structure fatigue damage of aircrafts.In order to get these cycles back,two causes of the problem,i.e.load grading and period compressing,are researched.Based on the research,a method called Long Short Period Test Spectrum is put forward：using average single flight time as short period to make basic spectrum block;determining long period by referring to serious loads occurring law;delaying basic block into a delayed spectrum according to long period;compressing by delayed spectrum period in order to find most disappeared cycles;inserting found cycles into delayed spectrum in proper manner to construct the accelerated test spectrum block.The method is proved to be valid by an example and the damage is closer to original damage than usual test spectrum block.
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