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三叉戟Ⅰ导弹的一个特点是采用可伸缩的头部减阻杆,减阻杆使气流分离动压降低,来减少钝头的阻力。阿波罗土星助推器的经验证明,气流分离可能为某些临界自由-自由弯曲振型提供负气动阻尼。问题的关键是要确定负阻尼达到足以使导弹结构受到破坏的条件。本文对这种气动阻尼作了分析,包括减阻杆不连续挠曲对气劝阻尼的影响,这种挠曲是由于减阻杆受到气动加热而膨胀,使杆结头松动所引起的。脉动压力在减阻杆上能传导最严重的横向气动载荷,因此本文还列出了脉动压力风洞实验数据。
One of the features of the Trident I missile is the use of a retractable head drag reducing rod that reduces the dynamic pressure of airflow separation to reduce blunt drag. Experience with the Apollo Saturn Booster has demonstrated that air-flow separation may provide negative aerodynamic damping for some of the critical free-free flexural modes. The crux of the matter is to determine the conditions under which negative damping will be sufficient to destroy the missile structure. This paper analyzes the aerodynamic damping, including the effect of the discontinuous deflection of the drag rod on the damping of the air, which is caused by the aerodynamic heating of the drag reducing rod, which causes the rod to loosen. The pulsating pressure can induce the most serious lateral aerodynamic loads on the drag reducing rod. Therefore, the experimental data of pulsating pressure wind tunnel are also listed in this paper.