基于谐波叠加法的连续紊流时域数值模拟

Numerical Simulation of Continuous Gust Based on Harmony Superposition Method

离散阵风动响应分析是弹性飞机载荷设计过程中的重要环节。由于离散阵风常由函数曲线匹配,存在置信度单一且缺乏高频信息等问题,文中提出一种基于谐波叠加法的时域数值模拟方法,将更适用于弹性飞机的Von Karman阵风模型拟合为时域随机阵风。利用数值模拟后的随机阵风激励对机翼进行离散阵风动响应计算,与数值模拟前的连续紊流动响应计算结果进行对比分析。结果表明,机翼的剪力、弯矩及扭矩均方根差值均在5%以内,证明了连续紊流时域数值模拟方法的准确性。

The discrete gust dynamic response is an important link in the loads design process of elastic aircraft.As the discrete gust is often matched by functional curves,with single confidence and lack of high frequency information,a numerical simulation method based on harmony superposition was proposed which converted the Von Karman model into the time-domain random gust.The Von Karman mode is more applicable to the elastic aircraft.Then the gust model before and after the numerical simulation was used to calculate the gust dynamic response of the wing.By comparing the result of the dynamic response,it was root-mean-square error that the deviation of the wing’s shearing,bending moment and torque was within 5%.The accuracy of the numerical simulation method based on harmony superposition was demonstrated.