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Acoustical performance of layered beams in the lower frequency range

机译：低频范围内分层光束的声学性能

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This study aims to predict the sound transmission properties of composite layered beams structures in the lower frequency range. In present paper a novel procedure to derive the sound isolation parameters for sandwich plates is under discussion. The main advantage of the present method is that it does not rely on strong assumptions about the model of the plate. The geometrical and mechanical parameters dependent frequency response functions and damping are presented for a three-layer beam. The effective stiffness constants of equivalent to lamina Timoshenko beam and their damping properties have been determined by using a procedure based on multi-level numerical schemes and eigenfrequencies comparison. Numerical evaluations obtained for the vibration of the equivalent Timoshenko beam have been used to determine the sound transmission properties of laminated composite beams with the system of DVA's. The optimization of beams - DVA's system sound absorption properties is performed in the low frequency range. The results have shown that the presence of a DVA causes a decrease in the sound transmission in the low-frequency range. The extension of the present approach to various layered plates with various DVA's systems will be performed in order to obtain optimal sound insulation. The optimization of layered plates - DVA's system sound absorption properties is performed in the low frequency range. The results have shown that the presence of a DVA causes a decrease in the sound transmission in the low-frequency range. The extension of the present approach to various layered plates with various DVA's systems will be performed in order to obtain optimal sound insulation.
机译：这项研究旨在预测较低频率范围内复合层梁结构的传声特性。在本文中，正在讨论一种推导夹层板隔声参数的新方法。本方法的主要优点是它不依赖于关于板的模型的强大假设。对于三层梁，提出了与几何和机械参数有关的频率响应函数和阻尼。通过使用基于多层数值方案和本征频率比较的程序，确定了等效于层状Timoshenko梁的有效刚度常数及其阻尼特性。等效的蒂莫申科梁振动的数值评估已用于确定采用DVA系统的层合复合梁的传声特性。波束的优化-DVA的系统吸声特性是在低频范围内执行的。结果表明，DVA的存在会导致低频范围内声音传输的减少。为了获得最佳的隔音效果，将执行本方法向具有各种DVA系统的各种分层板的扩展。分层板的优化-DVA的系统吸声性能是在低频范围内执行的。结果表明，DVA的存在会导致低频范围内声音传输的减少。为了获得最佳的隔音效果，将执行本方法向具有各种DVA系统的各种分层板的扩展。

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