大展弦比复合材料机翼的突风响应

大展弦比复合材料机翼受到的载荷主要来源于突风,较大的突风响应会影响飞机的飞行性能和安全性.为此建立了大展弦比机翼突风响应的分析方法.对于离散突风,通过时间积分得到响应的时间历程;对于连续突风,由频响函数求得响应的功率谱密度.以某机翼为例进行了数值计算,得到了不同突风速度、不同铺层角下,机翼的突风响应.结果表明,对于离散突风,翼尖的最大加速度和翼根最大弯矩都随突风速度的增加而增加,铺层角对翼尖处的最大加速度影响不明显,但对翼根弯矩有较明显的影响;对于连续突风,随着铺层角的增加,翼尖响应的均方值有明显的增加.

Continuous and discrete gust response of high aspect ratio composite wing

The airload of high aspect ratio composite wing(hacw) mainly comes from gust ,which has great effect on flight performance and structural safety.Approaches to calculate the response to continuous and discrete gust for hacw were presented. The approach to calculate the discrete gust response was a time-domain in integral. The approach of continuous gust response was based on the calculation of the power spectral density. Taking hacw with different ply angles for example, the response was calculated .Result indicates that, for discrete gust ,the largest acceleration of the wing tip and the largest bending moment of the wing root increase by gust velocity ;the ply angle has little effect on the largest acceleration of the wing tip but great on the largest bending moment of the wing root. For continuous gust,as the ply angle increases, the rms of the response of wing tip increases obviously.