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利用时域分析最小二乘复指数法(Least-Squares Complex Exponential,LSCE)推导出在脉冲响应下结构的模态参数,并利用ITD(Ibrahim Time Domain)法对随机振动响应的参数进行识别,为分析工作模态下结构的优化设计、损伤诊断和故障诊断打下基础。在充分研究了环境载荷对工程结构影响的基础上,重点分析了风载荷对大跨度工程结构的影响。利用有限元软件对空间桁架结构进行有限元工作模态分析,得出在环境载荷激励下的结构响应,进而利用参数识别方法得出模态参数,其结果与工程实际相符,证明了环境载荷处理的可行性和该理论体系的正确性。
The modal parameters of the structure under impulse response were deduced by using Least-Squares Complex Exponential (LSCE) method. The parameters of random vibration response were identified by ITD (Ibrahim Time Domain) Under the modal analysis, the optimal design of structure, damage diagnosis and fault diagnosis lay the foundation. On the basis of fully studying the influence of environmental load on the engineering structure, the influence of wind load on the structure of long-span engineering is analyzed emphatically. Finite element modal analysis of the space truss structure was carried out by using the finite element software, the structural response under the environmental load excitation was obtained, and then the modal parameters were obtained by using the parameter identification method. The results were consistent with the engineering practice. It was proved that the environmental load handling The feasibility and the correctness of the theoretical system.