CAJ | 학술논문

针对大展弦比机翼水平弯曲模态参与耦合颤振问题，首先用考虑几何非线性的颤振分析方法研究了某大展弦比机翼的颤振特性，结果表明水平一弯模态参与耦合降低了机翼传统模式的线性颤振速度；然后研究了复合材料的铺层主刚度方向角对机翼非线性振动特性和颤振特性的影响规律，提出了大展弦比机翼非线性颤振剪裁设计的新方法。结果表明主刚度方向角的变化主要引起了水平一弯模态振型的改变，一般表现为主刚度方向角从机翼后梁向后缘偏转，该阶模态的相对扭转振型节线位置向前缘移动；反之，该节线位置后移。进一步非线性颤振分析，发现水平一弯模态振型的变化引起了该阶模态参与耦合颤振速度的明显改变，主要表现为该颤振型的颤振速度随该阶模态的相对扭转振型节线位置前移量的增加而增大。通过两个算例验证了结论的正确性。
침대대전현비궤익수평만곡모태삼여우합전진문제，수선용고필궤하비선성적전진분석방법연구료모대전현비궤익적전진특성，결과표명수평일만모태삼여우합강저료궤익전통모식적선성전진속도；연후연구료복합재료적포층주강도방향각대궤익비선성진동특성화전진특성적영향규률，제출료대전현비궤익비선성전진전재설계적신방법。결과표명주강도방향각적변화주요인기료수평일만모태진형적개변，일반표현위주강도방향각종궤익후량향후연편전，해계모태적상대뉴전진형절선위치향전연이동；반지，해절선위치후이。진일보비선성전진분석，발현수평일만모태진형적변화인기료해계모태삼여우합전진속도적명현개변，주요표현위해전진형적전진속도수해계모태적상대뉴전진형절선위치전이량적증가이증대。통과량개산례험증료결론적정학성。
A method was presented to analyze the nonlinear flutter.Based on this method,the flutter character-istics of the high aspect wing were illustrated.The numerical results show that the flutter speed is decreased when the first horizontal bending mode involved.Secondly,this study discussed how the main direction of the compos-ite influenced the character of the nonlinear vibration and flutter,and established the method of the flutter clip-ping to the high aspect wing.And the result shows that the stiffness of structure can be changed by changing the main direction of the composite.It mainly changes the horizontal bending mode,makes the main direction tend to the trailing edge,and then makes the section line move to the leading edge.Further analyzing the nonlinear flut-ter reveals that it is the changing of the horizontal bending mode that causes the flutter speed change obviously. And by the section line of this mode moves ahead,the flutter speed will become larger.In the study,two exam-ples were illustrated to validate its truthiness.