摘要
随着飞行器轻量化发展,支承结构减重带来的中低频振动问题严重影响制导精度。以某型号高精度飞行器支承结构为研究对象,基于周期桁架的带隙特性,开展其振动传递规律分析及减振优化设计。通过有限元仿真模拟,探讨结构参数和材料参数对周期桁架带隙的影响,结合振动传递频率响应和结构带隙分布,发现可通过增加结构长度、降低材料弹性模量和提高材料密度实现减振频率的降低。基于此,设计出符合飞行器空间尺寸和强度要求的五周期桁架支承结构。结合功率流分析方法进一步对带隙优化,确定了该结构由铝合金与环氧树脂复合组成。通过对周期桁架振动测试,证实其在中低频范围内具有良好的减振性能,验证了结构带隙特性优化方法的可行性,为支承结构振动传递特性分析提供新思路,对工程实际中结构减振性能的提高具有参考价值。
With the development of aircraft lightweight,the guidance accuracy has been seriously affected by the low/medium frequency vibration.Based on the band gap characteristics of the periodic truss,the vibration transmission analysis and the vibration reduction optimization design for some high-precision aircraft are carried out.Through the finite element simulation,the influences of material parameters and structural parameters on the band gap of periodic truss are discussed.Combined with the frequency response of vibration transmission and the distribution characteristics of structural band gap,it is found that the vibration reduction frequency can be reduced by increasing the structure length,decreasing the material elastic modulus and improving the material density.On this basis,a periodic truss supporting structure of aircraft is designed which meets the size and strength requirement.Combined with the power flow analysis,the band gap is further optimized.It is finally determined that the supporting truss is composed of five periodic structures made of aluminum alloy and epoxy resin composite.Through the vibration test of the periodic truss,it can be seen that the structure has good vibration reduction performance in the low/middle frequency range,which verifies the feasibility of the optimization method of the structural band gap characteristics. It provides a new way to analyze the vibration transfer characteristicsof supporting structures and contributes to improving the vibration reduction performance in engineering practice.
作者
刘海宝
俎群
马驰骋
安玉民
张静宇
杨建国
戴士杰
赵丽滨
LIU Haibao;ZU Qun;MA Chicheng;AN Yumin;ZHANG Jingyu;YANG Jianguo;DAI Shijie;ZHAO Libin(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401;Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology,Tianjin 300401;Tianjin Jinhang Technical Physics Institute,Tianjin 300308;Key Laboratory of Advanced Intelligent Protective Equipment Technology of Ministry of Education,Tianjin 300401)
出处
《机械工程学报》
北大核心
2025年第11期162-170,共9页
Journal of Mechanical Engineering
基金
国家自然科学基金(12272120)
“慧眼行动”(62402010234)资助项目。
关键词
能带结构
带隙
功率流
周期结构
振动传递
band structure
band gap
power flow
periodic structure
vibration transfer
