In the first edition, models initially developed to describe wave propagation in porous media saturated by heavy fluids are used to predict the acoustical performances of air saturated sound absorbing porous media. In this expanded and revised edition, we have retained, with slight modifications, most of the basic material of the first edition and expanded it by revisiting several original topics and adding new topics to integrate recent developments in the domain of wave propagation in porous media and practical numerical prediction methods that are widley used by researchers and engineers. Chapters 1 to 3 dealing with sound propagation in solids and fluid and Chapter 9 dealing with the modelling of perforated facings were slightly modified. Chapters 4 to 6 were greatly revisited. A more detailed description of sound propagation in cylindrical pores is presented (Chapter 4), related to the more general presentation of new parameters and new models for sound propagation in rigid-framed porous media (Chapter 5). Also in Chapter 5 a short presentation of homogenization, with some results concerning double porosity media, is added. In Chapter 6, different formulations of the Biot theory for poroelastic media are given, with a simplified version for the case of media with a limp frame. In Chapter 11 we have revisited the original representation of the modelling of layered media (Chapter 7 of the first edition) and extended it to cover the systematic modelling of layered media using the Transfer Matrix Method (TMM). In particular, a step by step presentation of the numerical implementation of the method is given with several application examples. Major additions include five new chapters. Chapter 7 discusses the acoustic field created by a point source above a rigid framed porous layer, with recent advances concerning the poles of the reflection coefficient and the reflected field at grazing incidence. Chapter 8 is concerned by the poroelastic layers excited by a point source in air or by a localized stress source on the free face of the layer, with a description of the Rayleigh waves and the resonances. Axisymmetrical poroelastic media are studied in Chapter 10. In Chapter 12, complements to the transfer matrix method are given. They concern mainly the effect of the finite lateral extend, and the excitation by point loads, of sound pack- ages. Several examples illustrating the practical importance of these extensions are given (e.g. size effects on the random incidence absorption and transmission loss of porous media; airborne vs. structure borne insertion loss of sound packages). In Chapter 13, an introduction to the finite element modelling of poroelastic media is presented. Emphasis is put on the use of the mixed displacement-pressure formulation of the Biot theory, xiv PREFACE TO THE SECOND EDITION which appears in the Appendix of Chap. 6. Detailed description of coupling conditions between various domains including a waveguide are presented together with sections on the breakdown of the power dissipation mechanisms within a porous media and radiation conditions. Several applications are chosen to illustrate the practical use of the presented methods including modelling of double porosity materials and smart foams. As in the first edition, the goal of the book remains to provide in a concrete manner a physical basis, as simple as possible, and the developments, analytical calculations and numerical methods, that will be useful in different fields where sound absorption and transmission and vibration damping by air saturated porous media are concerned.

7.4 基于Mindlin板理论的四边形单元 前面所述的矩形单元和三角形单元都是基于 Kirchhoff薄板理论的，它忽略了剪切变形 的影响。由于 Kirchhoff 板理论要求挠度的导数连续，给构造协调单元带来了不少麻烦。为 此，采用考虑剪切变形的 Mindlin 板理论来克服[9,11]。这种方法比较简单，精度较好，并且 能利用等参变换，得到任意四边形甚至曲边四边形单元，因而实用价值较高。 7.4.1 位移模式 设有 4～8 结点四边形板单元，如图 7-6 所示。根据 Mindlin 板理论的假设，板内任意 一点的位移由三个广义位移w， xψ 和 yψ 完全确定。为了与有限元的结点位移相对应，采 用的位移列阵为 x y y x w w θ ψ θ ψ         = =       −   u (7.76) ξ η x y z wi (fzi) θyi (Mθyi) θxi (Mθxi) i ξ η 图 7-6 四边形板单元

Labview 关于Sound and Vibration的教程资料. 使用行业是： 振动与噪声的研究与控制

OpenAL和Alut的开发SDK 以及x64/86的DLL

Dolby Atmos for Sound Bar Products System Development Kit and is intended to be used as guidance in designing the digital signal processing Dolby Atmos sound bar products that include home theater solutions.

使用深度学习进行环境声音分类 自主机器人是人工智能的一个领域，致力于设计可以执行任务的机器人，而无需任何外部来源的干预。 自主机器人将对我们在家庭，工业和公共场所的生活产生巨大影响。 这些机器人需要了解周围环境以表现出智能行为。 机器人感知周围环境的方式之一就是通过声音。 近年来，机器人的机械控制技术以可观的速度增长。 但是，他们通过听觉场景感知周围环境的能力仍处于起步阶段。 声音场景分类以多种方式补充了基于图像的分类，例如与有限的摄像机视角相比，麦克风本质上是全向的，并且音频信号需要较少的计算资源和较低的带宽。 装有麦克风的机器人可以通过分析来自声源的声音信号来以任何角度聆听并与人类互动，并且可以增强行为和辅助自主机器人的应用领域。 许多研究人员正在研究智能声音识别（ISR）系统，以使机器人能够了解真实的周围环境。 环境声音分类系统的目标是分析人类的听觉意识特征并将这种感知能力嵌入自主机

matlab通过声卡进行采集声音信号，并对声音信号进行初步分析处理。

采用FFT进行声音波形处理，只要有麦克，就可以实验

声学理论基础教材pdf 振动及噪声控制相关专业学习材料

AS 3.0 Sound类应用实例详解....