基于飞行科目统计分析的严重谱编制方法

我国飞机的疲劳试验绝大多数采用均值谱,具有疲劳周期较长的缺陷,若采用载荷严重谱则可以大大缩短试验时间。为满足全机试验疲劳寿命评估的需要,响应国内外飞机强度规范的要求,以国内某教练机的起落数据为基础,将任务分析法与统计思想相结合,建立基于飞行科目统计分析的严重谱编制方法,整理和完善编谱流程,编制得到各飞行科目包含加权中值载荷谱,一倍标准差谱,两倍标准差谱,90%存活概率95%置信度的严重谱,以及所有科目的总严重谱。通过K-S检验方法验证了载荷损伤分布的合理性,并根据当量损伤计算的统计结果给出严重谱代表起落的选取方法。结果表明:此严重谱编制方法合理有效,得到的编谱结果符合严重谱特征,选出的代表起落能够代表各飞行科目不同严重程度的使用情况。

Generating Methods of Severe Load Spectra for Airplanes Based on Statistic Analysis in Flight Subjects

Nowadays, the mean load spectra ,which has a defect of long fatigue period,is always used in fatigue test for aircrafts.Use the severe load spectra instead,the test time can be greatly reduced.To meet the demand of full-scale fatigue test for life evaluation and respond to the requirements of aircraft strength criterion at home and abroad, this paper combines task analysis method with flight subject statistic analysis method, and develops severe load spectra for airplane structure of every subject and all subjects based on take-off and landing data of a instructional airplane . The process of spectra generation has been arranged and completed.The load spectra are determined for weighted mean, the meen plus 1 standard deviations,the mean plus 2 standard deviations,and for the 90%probability/95% confidence level.The approach to choose representative take-off and landing of severe load spectra is presented by equivalent damage calculation and statistic analysis .after the equivalent damage distribution has been examined by contrasting through K-S method.