飞机大展弦比外挂机翼弹性颤振特性分析  

Aircraft with High Aspect Ratio Store Wing Elastic Flutter Characteristic Analysis

作　　者：许军[1] 马晓平[2] 

机构地区：[1]西北工业大学航空学院,陕西西安710065 [2]西北工业大学无人机研究所,陕西西安710065

出　　处：《计算机仿真》2015年第10期19-21,共3页Computer Simulation

摘　　要：大展弦比外挂增加了飞机外挂颤振分析问题的复杂程度。为分析其弹性颤振特性,提出了考虑大展弦比机翼的平面内弯曲效应的方法。将传统机翼的弯扭分析扩展到大展弦比机翼的弯弯扭,在非线性建模过程中考虑了结构非线性、气动非线性和外挂引起的非线性;利用Dirac函数考虑外挂位置的影响;利用k方法进行线性颤振计算,用分岔图方法分析带外挂机翼的弯弯扭极限环分岔特性。仿真结果表明平面内弯曲效应不可忽略,且极限环分岔点在线性颤振速度以下即发生。研究结论可为飞机外挂弹性颤振分析提供参考。High aspect ratio store increase the complexity of aircraft store flutter analysis. In order to analyse the characteristics of elastic flutter, a method considering the wing in - plane bending effects was put forward. The in - plane bending of the high - aspect - ratio wing was considered, and the bending - torsion motion of the traditional wing was extended to the bending - bending - torsion motion of the high - aspect - ratio wing. Dirac function was used to precisely consider the location and properties of the wing with an external store. The flutter was calculated with k - method. The bifurcation characteristics of the high aspect ratio wing store system were analyzed based on the bifurcation diagram. Simulation results show that the effect of the in - plane bending should not be ignored, and limit cycle bifurcation points were below the linear flutter speed. Research conclusion can provide some reference for aircraft store elastic flutter analysis.

关 键 词：极限环颤振 大展弦比 外挂 分岔图 弯弯扭 

分 类 号：V271.4[航空宇航科学与技术—飞行器设计]