机翼带外挂高阶高频颤振特性研究

High-order & High-frequency Flutter Characteristic of Wing Carrying Plug-in Weapons

目的研究机翼带多外挂物引起的高阶高频颤振的特性,为类似事例提供参考。方法基于某飞机带多外挂物构形进行结构动力学建模与修正、颤振计算分析和低速颤振风洞试验,最终进行颤振飞行试验验证。结果颤振计算分析和低速颤振风洞试验,可以得出明显的以副翼旋转和机翼二扭为主的高阶高频颤振,颤振飞行试验随着速度的增加,频谱分析图中低频峰值逐渐减小,高频峰值不断明显,与风洞试验规律基本一致,有高阶高频颤振迹象。结论各种研究方法均可得出高阶高频颤振现象及其特点,基本证实高阶高频颤振的存在。

Objective To research high-order&high-frequency(HOHF)flutter caused by aircraft wing of multiple plug-ins to provide reference for similar cases.Methods Structure dynamic model of wing carrying multiple plug-ins were developed and corrected.Flutter calculation analysis and low speed wind tunnel test were carried out to finally conduct a flutter flight test.Results Apparent HOHF coupled of aileron rotation and wing 2st twisting could be obtained from flutter analysis and low speed wind tunnel test.Flutter flight test spectrum result also showed that the peak value of low frequency decreased and high frequency rose with the increase of speed.It was basically in line with the rules of tunnel test.HOHF flutter existed.Conclusion Various research methods show high-order&high-frequency flutter and its features.It basically demonstrates the existence of HOHF flutter phenomenon.