Fatigue life evaluation method based on load spectrum similarity

The invention discloses a fatigue life evaluation method based on load spectrum similarity, and the method comprises the steps: building a random load spectrum similarity discrimination method, and discriminating the similarity of an airplane load spectrum; obtaining equivalent damage of a similar aircraft load spectrum by adopting rain flow counting, Ottane transform and Miner theories; and based on the service life under the reference spectrum, performing relative damage calculation on the similar aircraft load spectrum to obtain the service life of the aircraft structure under the to-be-detected load spectrum. Through a fatigue test, the reasonability and calculation accuracy of the relative damage evaluation method based on load spectrum similarity discrimination are verified. 本申请公开了基于载荷谱相似性的疲劳寿命评估方法，包括，建立随机载荷谱相似性判别方法，判别飞机载荷谱的相似性；采用雨流计数、奥丁变换和Miner理论，获得相似性飞机载荷谱的当量损伤；基于参考谱下的寿命，对所述相似性飞机载荷谱进行相对损伤计算，获得待检载荷谱下飞机结构寿命。本申请通过疲劳试验，验证了基于载荷谱相似性判别的相对损伤评估方法的合理性和计算准确性。