“六西格玛”方法在机载测试参数误差分析中的应用

Analysis of Parameter Error in Flight Test by 6 Sigma Methods

科研试飞中,为真实反映飞机各项技术指标的实际状态,机载测试系统需提供精确的数据,而测试的中间环节较多,所测的各种参数结果势必会有误差;为满足试飞任务的精确需求,本文通过从测试系统误差的来源入手,来分析机载测试参数产生误差的各个环节,以压力参数为例,运用"六西格玛"方法中的测量参数误差的定义、测量、分析、改进及控制五项流程,以三架机的压力传感器的校准历史数据为样本,对精度结果作了详细分析,得出了事先确认参数具体压力变化区间,根据测试系统精度分布特点选用更合适范围的传感器来保证精度要求,将6西格玛"方法用于压力参数误差分析可行的结论;并提出,将其推广到其它各类测试参数的误差分析,将有利于在现有条件下更合理地配套测试仪器设备,更好地满足参数测试精度需求。

In flight test,in ordor to reflect actual status of technical parameters,flight test system must provide accurate data,including many processes,flight test system＇ parameters must exist error.To meet the precision requirements,this text analyzed the possible processes that bring error,illustrated by the example of pressure parameter,starting with the method of ＂ six Sigma＂ definition,measurement,analysis,improvement and control of the five processes,with three airplane＇s pressure sensor calibration original data as samples,analyzed precision results,and educed that in advance to confirm specific pressure change interval parameters,according to the distribution characteristics of the test system precision to choose appropriate sensors to meet precision requirements,analysis of pressure parameter error in flight test by 6 Sigma methods is possible.Finally educed conclusion that generalized to other test parameters error analysis can lead us match the instruments rationally and meet the precision requirements.