论文部分内容阅读
本文根据飞机横航向运动的特点,对滚转模态特征根的精确近似值进行了计算,导出了荷兰滚模态阻尼的表达式,克服了现有近似式在低速范围内失效的缺点。通过对该表达式的分析,对横、航向静稳定性参数m_x~β及m_y~β在荷兰滚模态阻尼中的作用进行了讨论。说明了在|m_x~β|加大或|m_y~β|减小时,荷兰滚模态的阻尼不仅会减小(习惯说法),而且也会加大。提出了决定这种不同变化规律的判据,解释了现有资料中关于此问题的二种相反说法的适用范围。
In this paper, according to the characteristics of the transverse movement of the aircraft, the accurate approximation of the root of the roll mode is calculated. The expression of the damping of the Dutch roll mode is deduced, which overcomes the shortcoming of the failure of the existing approximation in the low speed range. Through the analysis of this expression, the role of static stability parameters m_x ~ β and m_y ~ β in Dutch roll mode damping are discussed. It is shown that the damping of the Dutch roll mode not only decreases (as is customary) but also increases when | m_x ~ β | increases or | m_y ~ β | decreases. Put forward the criteria for deciding the law of these different changes and explained the scope of application of the two opposite theories on this issue in the existing data.