【摘要】 以新型空间结构为研究对象,建立了ANSYS有限元模型,对结构的模态频率、模态振型、单频激励响应及白噪声激励下的结构响应进行了较为全面的研究。研究发现:虽然损伤对结构模态频率并不敏感,但振型对损伤却有着相当高的敏感程度;同时对结构的谐响应分析和三维白噪声激励分析发现:损伤不仅仅会对已参与结构振动的模态振型产生影响,同时还会导致产生新生的模态参与到结构的振动中及消亡部分已参与到结构振动中的模态,损伤还会造成结构模态的跃迁等现象。诸多的损伤对空间结构在动力特性方面造成的影响都为其损伤识别提供了全新的参考信息和全新的思路。更多还原

【Abstract】 In this paper,the finite element model of the National Aquatics Center structures is established,and the further studies of the structure modal frequencies,the modal vibration shapes,the single-frequency excitation responses,and the structure responses under the white nose are carried out.The results show that the structure modal frequencies have no sensitive to the structure damages,however,the vibration shapes have a high sensitization to the ones;at the meantime,discovered from the simple harmonic analysis and the three-dimensional white nose excitation analysis,the structure damages not only have some effects on the modal vibration shapes provoked in the structure vibration,but can lead to the new modals provoking into the structure vibration and some vibration shapes losing as well,and the structure modal transition phenomenon.The effects of the damages to the space structure dynamic properties give some new reference informations and thoughts on the damage identification.更多还原