本文選題：非均質 + 損耗因子　； 參考：《哈爾濱工業(yè)大學學報》2017年11期

【摘要】：復合材料以其優(yōu)越的性能在船舶制造領域應用愈加廣泛,鋼-復合材料非均質組合系統(tǒng)作為典型的工程結構形式,有著異于單一均質系統(tǒng)的動力學特性.由于實際結構一般較為復雜,試驗測試時難以直接確定組合系統(tǒng)中各階主要參與振動或噪聲輻射的子系統(tǒng)組成.為了直觀快速地獲取復合結構主導參與振動的子系統(tǒng),從非均質組合系統(tǒng)的主從振動模式和阻尼耗散機理分析入手,結合統(tǒng)計能量分析原理中關于損耗因子的分類描述,對組合系統(tǒng)振動時所表征的阻尼規(guī)律進行分析.計算并對比了鋼-復合材料組合系統(tǒng)各階模態(tài)內損耗因子,以及分析了其主導振動子系統(tǒng)的能量占比.結果表明:排除聲輻射和邊界損耗影響后,非均質組合系統(tǒng)的內損耗因子在數值上接近于其主導振動子系統(tǒng)的材料損耗因子,并介于各子系統(tǒng)材料損耗因子極值之間.完成了某典型組合系統(tǒng)的模態(tài)識別,驗證了運用損耗因子組成規(guī)律辨識主導振動子系統(tǒng)的可行性,彌補了試驗測試中對復雜非均質組合結構在模態(tài)識別方面的不足.
[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.
【作者單位】： 海軍工程大學艦船工程系;
【基金】：國家自然科學基金(51479205)
【分類號】：TB33

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