摘要
太阳帆航天器在绕地轨道中将会周期性地进出地球阴影,经历热环境的剧烈变化,在热辐射冲击作用下,太阳帆这种大柔性空间结构的热致响应值得研究。以方形有桅杆式太阳帆为研究对象,考虑热辐射等非线性因素,建立了太阳帆的热-结构耦合动力学模型,分析了太阳帆桅杆-薄膜结构热诱发振动的特点和影响因素。分析结果表明:太阳帆由地球阴影区进入光照区将会发生明显的热诱发振动;随着热流入射角的增大,太阳帆桅杆截面的摄动温度减小,热诱发振动减弱,频率不变;太阳帆桅杆刚度的增大有利于抑制结构热诱发振动的发生;帆膜预应力将会影响太阳帆的热诱发振动,随着桅杆轴力增大,热诱发振动的振幅增大,频率减小,当轴力增大至一定程度,太阳帆的热诱发振动将会发散。
When solar sails are orbiting earth,the day-night transits will cause sudden change of thermal environment of solar sails.Thermally-induced structural response of solar sails due to this thermal shock is worth studying.Considering the nonlinear effect of heat radiation*thermal-structural coupling dynamic equations of a five-point suspension square solar sail are established and then the thermal-structural analyses are conducted.The characteristics and affected factors of thermallyinduced vibration of the solar sail are analyzed.Numerical results show that the noticeable thermally-induced vibration happened to the five-point suspension square solar sail.The perturbation temperatures of boom cross-section and the thermallyinduced vibration of the sail decreased,but the frequencies remain constant when the incident angle of heat flux increased.The increasing thickness of the boom cross-section will be beneficial to suppressing the thermally-induced vibration of the sail.The prestress of membranes of the sail could affect the thermally-induced vibration.As the axial load of the boom increases,the vibration amplified increases and the frequency decreases.The thermally-induced vibration may become unstable when the axial load of the boom increases to some extent.
作者
张军徽
佟安
武娜
刘应华
ZHANG Junhui;TONG An;WU Na;LIU Yinghua(School of Civil Engineering.North China University of Technology,Beijing 100144,China;School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2019年第11期156-164,共9页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(11572001)~~
关键词
太阳帆
振动
热致响应
框架-薄膜结构
绕地轨道
olar sail
vibration
thermally-induced response
frame-membrane structure
earth orbit
