ANALYSIS OF WRINKLES'''' INFLUENCES ON MEMBRANE''''S VIBRATION CHARACTERISTICS
褶皱对薄膜振动特性的影响分析

A mechanical model of membrane wrinkle is established in this paper.Relationship between the strains and the stresses in the wrinkled regions is analyzed based on the tension field theory and the stability theory.The NBA-UM (nonlinear buckling analysis-update matrix) method is proposed for the dynamic analysis of membrane wrinkles,and the study on the vibration characteristics of the membrane.The result shows that"excess shrink"phenomena is due to wrinkles,which in turn change the stress distribution in the membrane. Wrinkles greatly influence the vibration characteristics of the membrane,and large amplitude wrinkles will change the natural frequencies and modal forms of the membrane.In conclusion,it is shown that the NBA-UM method can effectively predict the dynamic behaviors of membrane wrinkles.