摘要
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 the impulse response are derived by using time-domain analysis least square complex exponent（LSCE） method,and the parameters of random vibration response are identified by using Ibrahim Time Domain（ITD） method.It has laid a foundation for optimized design,damage diagnosis and fault diagnosis of the structure under operating modal.The influence of wind load on the structure of large span engineering is analyzed in detail on based of the impact of environmental load on engineering structures.By using finite element software for typical space truss,structural finite element modal analysis is performed and structural response is obtained under excitation in the environmental load.Then,modal parameters are obtained by using the parameter identification method.The results correspond with engineering practice and it proves the feasibility of environmental loading processing and the correctness of the theory system.
出处
《机械设计》
CSCD
北大核心
2011年第7期20-24,共5页
Journal of Machine Design
