采用 Image-Pro Plus 软件表征闭孔泡沫铝的孔结构，在此基础上采用 PolyMAX 模态分析法研究了闭孔泡沫铝的模态阻尼比与孔隙率、平均孔径和固有频率之间的关系，并通过模态置信度矩阵验证各阶试验模态的独立性。结果表明：各阶模态之间具有较高的独立性，泡沫铝的阻尼比随孔隙率的提高以及平均孔径的降低而呈增加的趋势，且各阶固有频率随孔隙率的增加而降低。
The software Image-Pro Plus was employed to characterize pore-structure of closed-cell aluminum foams,and then the relationship between the modal damping ratio and porosity,nominal pore-size and natural frequency of aluminum foam were investigated using the PolyMAX modal analysis method.Furthermore,the modal assurance criterion was used to verify the independence of experimental results.The results show that each order modal had high independence.The damping ratio increased with the increase of porosity,but inversely proportional to the nominal pore-size.Meanwhile,each order natural frequency of the aluminum foam decreased with the increase of the porosity.
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