非均质系统中主导振动子系统的阻尼辨识法

发布时间：2018-05-13 18:55

本文选题：非均质 + 损耗因子　；参考：《哈尔滨工业大学学报》2017年11期

【摘要】：复合材料以其优越的性能在船舶制造领域应用愈加广泛,钢-复合材料非均质组合系统作为典型的工程结构形式,有着异于单一均质系统的动力学特性.由于实际结构一般较为复杂,试验测试时难以直接确定组合系统中各阶主要参与振动或噪声辐射的子系统组成.为了直观快速地获取复合结构主导参与振动的子系统,从非均质组合系统的主从振动模式和阻尼耗散机理分析入手,结合统计能量分析原理中关于损耗因子的分类描述,对组合系统振动时所表征的阻尼规律进行分析.计算并对比了钢-复合材料组合系统各阶模态内损耗因子,以及分析了其主导振动子系统的能量占比.结果表明:排除声辐射和边界损耗影响后,非均质组合系统的内损耗因子在数值上接近于其主导振动子系统的材料损耗因子,并介于各子系统材料损耗因子极值之间.完成了某典型组合系统的模态识别,验证了运用损耗因子组成规律辨识主导振动子系统的可行性,弥补了试验测试中对复杂非均质组合结构在模态识别方面的不足.
[Abstract]:Composite materials are widely used in shipbuilding due to their superior properties. As a typical engineering structure, steel-composite heterogeneous composite systems have different dynamic characteristics than single homogeneous systems. Because of the complexity of the actual structure, it is difficult to determine directly the components of the subsystems in the combined system which are mainly involved in the vibration or noise radiation. In order to obtain the subsystems in which the composite structure dominates vibration directly and quickly, starting with the analysis of the master-slave vibration mode and damping dissipation mechanism of the heterogeneous composite system, combined with the classification description of the loss factor in the principle of statistical energy analysis. The damping law represented by the vibration of the combined system is analyzed. The internal loss factors of the steel-composite system are calculated and compared, and the energy ratio of the dominant vibration subsystem is analyzed. The results show that the internal loss factor of the heterogeneous composite system is numerically close to the material loss factor of its dominant vibration subsystem and lies between the extreme values of the material loss factor of each subsystem after the effects of acoustic radiation and boundary loss are excluded. The modal identification of a typical composite system is completed, and the feasibility of identifying the dominant vibration subsystem with the rule of loss factor is verified, which makes up for the deficiency in modal identification of complex heterogeneous composite structures in the test.
【作者单位】：海军工程大学舰船工程系;
【基金】：国家自然科学基金(51479205)
【分类号】：TB33

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