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Realisation of a locally resonant metamaterial on the automobile panel structure to reduce noise radiation

机译：在汽车面板结构上实现局部共振的超材料，以减少噪声辐射

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This study aims to demonstrate the reduction in noise and vibration of an automobile dash panel structure by applying a locally resonant metamaterial (LRM). LRMs are implemented by adding a subwavelength array of local resonators to a host structure. Here, the minimum repeated structure is called a unit cell. Owing to dynamic absorption in a unit cell, LRM has a stop band (or also called a band gap), which is a frequency band in which waves cannot propagate. Taking advantage of the stop band, various studies have been conducted on mechanical noise and vibration problems. However, no case has yet been published regarding the application of LRMs to industrial structures such as automobile dash panels because of their complex shape. To overcome the difficulties of LRM realisation in dash panels, an attachable local resonator (ALR) is proposed in this study. The proposed ALR consists of a local resonator and a permanent magnet to be attached on the dash panel surface. To predict the stop band formation, a finite element-based unit cell analysis method is developed, and several ALRs are designed based on the stop band. The designed ALRs are applied to an actual automobile dash panel structure and the acoustic and vibration responses are measured. The measurement results demonstrate that the vibration and noise radiation from the dash panel structure are greatly reduced in the designed stop bands. (C) 2018 Published by Elsevier Ltd.
机译：这项研究旨在证明通过应用局部共振超材料（LRM）来减少汽车仪表板结构的噪声和振动。 LRM通过将局部谐振器的亚波长阵列添加到主机结构中来实现。在此，最小重复结构称为单位晶胞。由于单位单元中的动态吸收，LRM具有阻带（或也称为带隙），该阻带是波无法传播的频带。利用阻带，已经对机械噪声和振动问题进行了各种研究。但是，由于LRM形状复杂，因此尚未公开有关将LRM应用于工业结构（如汽车仪表板）的案例。为了克服仪表板上LRM实现的困难，本研究提出了一种可连接的本地谐振器（ALR）。拟议的ALR由一个本地谐振器和一个永久磁铁组成，该磁铁将附着在仪表板上。为了预测阻带的形成，开发了基于有限元的晶胞分析方法，并基于阻带设计了几种ALR。将设计的ALR应用于实际的汽车仪表板结构，并测量声学和振动响应。测量结果表明，在设计的阻带中，仪表板结构的振动和噪声辐射大大降低。 （C）2018由Elsevier Ltd.发布

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