基于自互功率谱法的高桩码头物理模型模态参数识别研究

摘要

The theoretical basis of modal parameter identification based on auto-cross spectrum density method was introduced,and the method of modal test for high-piled wharf physical model was explained in this paper.The large high-piled wharf physical model was established with PMMA as raw material for modal test.Four order natural frequency and damping ratio of high-piled wharf physical were identified by auto-power spectrum, cross-power spectrum and coherence function.Mean while, natural frequency was obtained by finite element software ANSYS.Compared with the results of experiment, the ANSYS results near to them.%阐述了自互功率谱法识别结构模态参数的理论依据,以某港高桩码头为原型,有机玻璃为原材料建立物理模型进行模态试验.介绍了高桩码头物理模型模态试验方法.采用自功率谱、互功率谱和相干函数分析,识别了高桩码头物理模型前4阶同有频率和阻尼比.同时运用有限元软件ANSYS分析得到相应的固有频率,试验数据与ANSYS分析结果的对比表明,2种方法所得结果比较接近.