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本文针对某型飞机的应变数据出现的“台阶”现象,基于对分布式应变采集系统结构、原理及滤波器逻辑设计的详细分析,得出系统的数字滤波器选型差异导致故障现状的出现,通过将“简单数据抽取+FIR(有限长单位冲击响应)数字滤波器”的数字滤波模式更改为“CIC数字滤波器(级联积分梳妆数字滤波器)+IIR数字滤波器(无限冲击响应数字滤波器)补偿,并修改某采集计数器跳转条件后,”台阶“故障现象消失,同时对修改后的数字滤波器做了详细的动态特性验证测试,测试
Based on the detailed analysis of the structure, principle and filter logic design of the distributed strain gage system, this paper presents the ”step“ phenomenon of the strain data of a certain type of aircraft, and draws the conclusion that the system digital filter selection difference causes the fault Appears by changing the digital filter mode of ”Simple Data Extract + FIR (Finite Length Unit Impulse Response) Digital Filter “ to ”CIC Digital Filter (Cascade Integral Digital Makeup Filter) + IIR Digital Filter Infinite impulse response digital filter) compensation, and modify the jump conditions of a collection counter, “step ” failure phenomenon disappeared, at the same time, the modified digital filter made a detailed dynamic characteristic verification test, test