复合材料后掠翼机翼气动弹性分析

Aeroelastic Characteristics Analysis of a Composite Backward-Swept Wing

对于复合材料后掠翼机翼，扭转发散问题一般并不突出，其操纵面的操纵效率和颤振临界动压是比较关心的两个问题。文章采用COMPASS软件，对某复合材料后掠翼飞机进行了操纵效率分析，并重点计算了该机在不同高度下颤振速度随马赫数的变化情况，详细分析了机翼振动、颤振特性随蒙皮不同铺层比变化情况。结果表明，舵面操纵效率随着马赫数的增加而降低，飞机设计要通过设计参数调整选择合适的副翼反效动压与扭转发散动压之比，使飞行范围内的操纵效率尽可能高；同时复合材料后掠机翼的弯扭耦合效应相当突出，而复合材料剪裁可以调整0°、＋45°、90°铺层比例，提高结构扭转刚度，从而提高飞机颤振速度。

For a composite material backward-swept wing, the control surface efficiency and flutter speed are more worth concerning compared with torsion divergence. The aeroelastic characteristics were calculated and analyzed by the COMPASS software, including the control efficiency of a wing separately, and various flutter speeds corresponding to different subsonic mach numbers were calculated emphatically. The results indicate that the control surface efficiency decreases as Mach number increases. The design parameters must be adjusted to obtain appropriate aileron reversal dynamics pressure to torsion radiation dynamics pressure ratio which makes the control efficiency higher. At the same time the bending and torsion coupling effect of composite material swept-back wing is quite severe. The composite material clipping can rectify the proportion of the 0°, ＋45° and 90° in order to enhance the structure torsion stiffness and the aircraft flutter speed.