点阵异质MPP吸声器设计的基础研究

IF 1.3 Q3 ACOUSTICS Acoustics (Basel, Switzerland) Pub Date : 2022-07-31 DOI:10.3390/acoustics4030037
K. Sakagami, M. Kusaka, Takeshi Okuzono
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引用次数: 2

摘要

最近,有人提出了点阵艺术mpp,其中用孔制作设计图案。在这种情况下,MPP总体上是异构的。然而,现有的理论用于预测MPPs的吸收特性假设均匀性。因此,需要对异构mpp的方法进行详细阐述。在以前的工作中,作者提出了一种利用各部分不同参数的综合阻抗来预测异质MPP吸收特性的方法;本文称之为合成阻抗法(SIM)。SIM卡可以潜在地用于各种异构mpp;但是,其适用范围需要明确。此外,在提出多点艺术异构mpp的设计概念时,需要确定使所设计的mpp处于SIM范围内的条件。因此,在本研究中,为了明确SIM的适用范围,首先制备了12个样品,然后对测量的吸声特性和预测的吸声特性进行了预测误差的比较和检验。结果表明,要产生可预测的非均质mpp,必须满足两个条件:(1)孔分布在试样的整个表面上;(2)孔间距一定。考虑到这些条件,提出了一种点状异质MPP的设计理念:两种类型的孔,较大的孔用于图案,较小的孔用于背景,以满足上述两个条件。对九个原型的案例研究表明,SIM可以根据上述概念对点阵异质mpp进行预测。
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A Basic Study on the Design of Dotted-Art Heterogeneous MPP Sound Absorbers
Recently, dotted-art MPPs have been proposed in which a designed pattern is made with the holes. In such a case, the MPP becomes heterogeneous in general. However, existing theories used for the prediction of the absorption characteristics of MPPs assume homogeneity. Therefore, the elaboration of a method for heterogeneous MPPs needs to be performed. In previous work, the authors proposed a method to predict the absorption characteristics of a heterogeneous MPP by using synthesized impedances of each part with different parameters; this is called the synthetic impedance method (SIM) in the present paper. The SIM can potentially be used for various heterogeneous MPPs; however, its scope of applicability needs to be clarified. Furthermore, in proposing a design concept of dotted-art heterogeneous MPPs, the condition that would make the designed MPPs fall within the scope of the SIM needs to be determined. Therefore, in this study, in order to clarify the scope of the applicability of the SIM, twelve samples are first prepared, and then measured sound absorption characteristics and predicted ones are compared and examined in terms of prediction errors. The results show that there are two conditions that should be met to produce predictable heterogeneous MPPs: (1) holes are distributed over the entire surface of the specimen, and (2) the hole spacing is constant. Considering these conditions, a design concept for a dotted-art heterogeneous MPP is proposed: two types of holes, larger holes for the pattern and smaller holes for the background, should be used to meet the above two conditions. Case studies with nine prototypes show that the SIM can make predictions for dotted-art heterogeneous MPPs fabricated according to the concept described above.
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