Structural-Dynamic and Acoustic Design of Anisotropic Multilayered Composite Structures

摘要

Lightweight structures in the form of composite materials are increasingly used in many industrial fields for high-technology applications due to their versatile property profile. Especially for dynamically loaded structures a high material damping combined with low constructive weight and adequate stiffness is required. But in today's sophisticated lightweight structures in the form of composite materials are increasingly used in many industrial fields for high-technology applications due to their versatile property profile. Especially for dynamically loaded structures a high material damping combined with low constructive weight and adequate stiffness is required. But in today's sophisticated applications, Lightweight structures will have to meet also very high acoustic (low noise) standards. Therefore, the vibro-acoustic behaviour of composite lightweight structures has to be included in the design process. The design of composite structures is complicated by the layered heterogeneous material. Particularly, complex stress-strain relations occur even for geometrically simple structures because of the coupled membrane-bending properties. Thus, classical models can not exactly describe the vibrations and the acoustic radiation of these structures. On the basis of extensive experimental and numerical investigations for single layer and multilayered plate structures, advanced analytical methods have been developed, which offer the possibility to calculate the eigenfrequencies and eigenforms as well as the acoustic radiation dependent on the specific material properties.