摘要
针对系留气球球体结构的动力学特性展开分析。首先根据虚位移原理建立球体薄膜结构的动力学方程并对其展开分析,得出自振频率与薄膜面密度和面内张力的关系;其次建立系留气球球体结构的有限元模型并进行模态分析,计算低阶固有频率和分析主振型,给出各阶固有频率和压差的关系曲线;最后对球体结构的动力学特性展开测试和分析,并对有限元分析结果进行验证。仿真和测试结果表明,尾翼结构由于基础刚度较小,其振动频率较低,且受球体内压影响较小;主气囊结构的固有频率随着球体内部压差的增大而增大。分析结果为系留气球球体结构动力学特性的进一步研究奠定可靠基础。
The dynamic characteristics of tethered balloon are analyzed in this paper. Firstly, the kinetic equation of the membrane was established according to the principle of virtual displacement and analyzed, the relationship be- tween the natural frequency, the membrane density, and the in-plane tension was obtained. Secondly, the finite ele- ment model of the balloon was established, the modal analysis was carried out, the low frequency and the main mode were calculated, and then the relationship between the natural frequency and the pressure was given. Finally, the dy- namic characteristics of the structure were tested and analyzed, and the results of the finite element analysis were veri- fied. Simulation and test results show that the vibration frequency of the tail is small due to the small foundation stiff- ness, and the internal pressure of the balloon has little effect on the tail frequency. The natural frequency of the main capsule increases with the pressure inside. The results provide a reliable basis for further study on the dynamic char- acteristics of tethered balloon.
作者
何泽青
王生
栗颖思
秦玉梅
HE Ze-qing;LI Ying-si;QIN Yu-mei(University of Chinese Academy of Sciences,Beijing 100190,China;Academy of Opto-Electronics,Chinese Academy of Sciences,Beijing,100094,China)
出处
《计算机仿真》
北大核心
2018年第7期27-31,36,共6页
Computer Simulation
关键词
系留气球
动力学特性
有限元
Tethered balloon
Dynamic characteristics
Finite element
