外挂物、副翼操纵刚度对机翼颤振特性的影响

本文采用气动弹性模型试验的方法,研究了外挂物重量、悬挂位置和不同的副翼操纵系统刚度对机翼低速颤振特性的影响。气动弹性模型是严格地按相似律的要求进行设计的,由于机翼是对称的,故仅设计了半机翼。而试验既进行了地面振动试验,也进行了风洞试验。文中对试验结果进行了分析。最后,提出两点意见供飞机防颤振设计人员参考:1.副翼的旋转运动是发生主翼面-副翼耦合颤振的主要影响因素,故与操纵系统刚度密切相关的副翼旋转频率值对机翼防颤振设计极为重要。2.机翼携带翼下外挂物,使机翼临界颤振速度明显下降;在设计状态下,外挂物位于机翼内侧的状态与位于外侧的状态相比,机翼临界颤振速度降低更显著。

EFFECT OF EXTERNAL STORES AND AILERON CONTROL STIFFNESS ON FLUTTER CHARACTERISTICS OF WING

In this paper,the effect of the external store weight,suspension position and different aileron control system stiffness onflutter characteristics of a low-speed wing have been studied experime-ntally with an aeroelastic model.According to the similarity lawrequirement,an aeroelastic model is designed strictly.Since the wingis symmetric,therefore,we may just design the half of it.Both groundvibration testing and wind tunnel testing were carried out.The experi-mental results were analyzed.Finally,two conclusions are presentedthai would give a reference to the aircraft designers in the flutterpreventing research:1)The effect of the aileron rotary motion on wing-plane/aileroncoupling flutter is the main influence factor,So that,aileron rotaryfrequency value,that is related to the control system stiffness tightly,is very important to flutter preventing design of wing.2)A wing carrying underwing external stores were evidentlyreduced the critical flutter velocity of it;under design state,the criti-cal flutter velocity of wing with inner external store state is evidentlyreduced more than the one with outside external store state.