Modeling and Computation of Plate Resonator Silencers

消声器是阻碍声音在流动通道中传播的部件或装置。因此，它们对于传播路径处的噪声控制至关重要，并且用于非常不同的应用，例如飞机发动机、通风和空调系统、发动机和燃气轮机的排气系统等等中的降噪。有几种工作原理，所有这些都产生与频率相关的传输损耗。对于大多数应用，在宽频率范围内的传输损耗是重要的。然而，目前，在低频下有效的宽带声音衰减是一个主要的挑战。在所需的尺寸、对通道内气流的影响以及成本方面，始终需要做出实质性的让步。该项目的主要目的是准确了解消声器的工作原理，其中板谐振器用作气流通道中的隔音衬里。与许多其他概念不同，它们提供了一个封闭的，光滑的表面，并在低频下表现出良好的性能。如果设计得当，它们可以同时提供宽带声音衰减。然而，到目前为止，这种消声器的设计是基于经验的。因此，需要开发一种分析计算模型，该模型揭示了基本的工作原理和参数依赖性，从而允许有针对性的设计和充分利用这种消声器的潜力。此外，将研究多层板谐振器，以找出相邻或多层不同调谐的板谐振器是否可以改善传输损耗以及改善到何种程度。最后，它的目的是建立模型的影响，流动的有效性的板谐振器消声器。分析计算模型将根据测量数据以及计算成本高得多的数值模型的结果进行验证。该项目的意义在于开发精确的、有针对性的板式谐振器消声器设计的可能性，这主要可以开辟消声器的新应用，而以前传统概念的声音衰减是不可能或仅部分可能的。这也使得该消声器概念的其他非声学优点可用。

Silencers are components or devices that hinder the propagation of sound in flow channels. Thus, they are crucial for noise control at the propagation path and are used for very different applications such as noise reduction in aircraft engines, in ventilation and air conditioning systems, in exhaust systems of engines and gas turbines and many more. There are several working principles, all of which produce frequency-dependent transmission loss. For most applications, transmission loss over a wide frequency range is important. Presently, however, efficient broadband sound attenuation at low frequencies is a major challenge. Substantial concession in terms of the required size, the influence on the flow in the channel and the costs are always necessary.The main objective of the project is to gain a precise understanding of the operation of silencers, where plate resonators are used as sound-damping linings in flow channels. Unlike many other concepts, they offer a closed, smooth surface and show a good performance at low frequencies. If properly designed they may offer a broadband sound attenuation at the same time. However, up to now the design of such silencers is on an empirical basis. It is therefore desirable to develop an analytical calculation model that uncovers the underlying working principles and parameter dependencies and thereby allows a targeted design and full use of the potential of such mufflers. Furthermore, multilayer plate resonators will be investigated to find out if and to what extent adjacent or multilayer, differently tuned plate resonators can improve the transmission loss. Finally, it is intended to model the influence of the flow on the effectiveness of the plate resonator silencers. The analytical calculation model is to be validated on the basis of measurement data as well as results of a much more computationally expensive numerical model.The significance of the project is to develop a possibility of a precise, targeted design of plate resonator mufflers, which can primarily open up new applications of silencers where previously sound attenuation with conventional concepts was not or only partially possible. This also makes other, non-acoustic advantages of this silencer concept available.