Toward an adjustable nonlinear low frequency acoustic absorber
Toward an adjustable nonlinear low frequency acoustic absorber
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DOI：
10.1016/j.jsv.2011.03.034
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发表时间：
2011-10
影响因子：
4.7
通讯作者：
R. Mariani;S. Bellizzi;B. Cochelin;P. Herzog;Pierre-Olivier Mattei
中科院分区：
文献类型：
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作者：
R. Mariani;S. Bellizzi;B. Cochelin;P. Herzog;Pierre-Olivier Mattei
最近在一篇论文中提出了一种声学谐振器与薄粘弹性膜之间的靶向能量传递（TET）现象的研究[R]。Bellet等，从声学系统到非线性膜吸收器的目标能量传递的实验研究[j] . Journal of Sound and Vibration, 329(2010) 2768-2791，为无有效耗散装置的低频域被动声控制提供了新的途径。实验结果表明，将扬声器用作在其线性范围外工作的悬浮活塞，也可以用作非线性吸声器。这种减振器技术的主要优点是可以根据工作条件独立调整装置参数（质量、非线性刚度和阻尼）。为了实现这一目的，对三种类型的商业装置（一种进行了结构修改）进行了准静态和动态试验，以确定其应有的构造特性。一个实验装置已经开发了使用一个一维声学线性系统耦合通过一个盒子（作为一个弱弹簧）到一个扬声器用作一个悬浮活塞作为本质上的非线性振荡器。在整个振声系统上进行的试验表明，从声介质到悬浮活塞的声TET发生了，并证明了这种新型吸振器在低频和宽频率范围内的效率。此外，用不同的NES质量进行的实验分析证实，可以根据声谐振器的激励水平来优化噪声吸收。& 2011 Elsevier Ltd.版权所有。
A study of the targeted energy transfer (TET) phenomenon between an acoustic resonator and a thin viscoelastic membrane has recently been presented in the paper [R. Bellet et al., Experimental study of targeted energy transfer from an acoustic system to a nonlinear membrane absorber, Journal of Sound and Vibration 329 (2010) 2768–2791], providing a new path to passive sound control in the low frequency domain where no efficient dissipative device exists. This paper presents experimental results showing that a loudspeaker used as a suspended piston working outside its range of linearity can also be used as a nonlinear acoustic absorber. The main advantage of this technology of absorber is the perspective to adjust independently the device parameters (mass, nonlinear stiffness and damping) according to the operational conditions. To achieve this purpose, quasi-static and dynamic tests have been performed on three types of commercial devices (one with structural modifications), in order to define the constructive characteristics that it should present. An experimental setup has been developed using a one-dimensional acoustic linear system coupled through a box (acting as a weak spring) to a loudspeaker used as a suspended piston acting as an essentially nonlinear oscillator. The tests carried out on the whole vibro-acoustic system have showed the occurrence of the acoustic TET from the acoustic media to the suspended piston and demonstrated the efficiency of this new kind of absorber at low frequencies over a wide frequency range. Moreover, the experimental analyses conducted with different NES masses have confirmed that it is possible to optimize the noise absorption with respect to the excitation level of the acoustic resonator. & 2011 Elsevier Ltd. All rights reserved.