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A simplified approach for the calculation of acoustic emission in the case of friction-induced noise and vibration

机译：摩擦引起的噪声和振动情况下声发射的简化计算方法

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摘要

The acoustic response associated with squeal noise radiations is a hard issue due to the need to consider non-linearities of contact and friction, to solve the associated nonlinear dynamic problem and to calculate the noise emissions due to self-excited vibrations. In this work, the focus is on the calculation of the sound pressure in free space generated during squeal events. The calculation of the sound pressure can be performed by the Boundary Element Method (BEM). The inputs of this method are a boundary element model, a field of normal velocity characterized by a unique frequency. However, the field of velocity associated with friction-induced vibrations is composed of several harmonic components. So, the BEM equation has to be solved for each frequency and in most cases, the number of harmonic components is significant. Therefore, the computation time can be prohibitive. The reduction of the number of harmonic component is a key point for the quick estimation of the squeal noise. The proposed approach is based on the detection and the selection of the predominant harmonic components in the mean square velocity. It is applied on two cases of squeal and allows us to consider only few frequencies. In this study, a new method will be proposed in order to quickly well estimate the noise emission in free space. This approach will be based on an approximated acoustic power of brake system which is assumed to be a punctual source, an interpolated directivity and the decrease of the acoustic power levels. This method is applied on two classical cases of squeal with one and two unstable modes. It allows us to well reconstruct the acoustic power levels map. Several error estimators are introduced and show that the reconstructed field is close to the reference calculated with a complete BEM.
机译：由于需要考虑接触和摩擦的非线性，解决相关的非线性动力学问题并计算由于自激振动引起的噪声排放，因此与尖叫声辐射相关的声学响应是一个难题。在这项工作中，重点是在尖叫事件期间在自由空间中产生声压的计算。声压的计算可以通过边界元法（BEM）进行。该方法的输入是边界元模型，即以唯一频率为特征的法向速度场。但是，与摩擦引起的振动相关的速度场由几个谐波分量组成。因此，必须针对每个频率求解BEM方程，并且在大多数情况下，谐波分量的数量很大。因此，计算时间可能过长。减少谐波分量的数量是快速估计尖叫声的关键。所提出的方法是基于均方速度中主要谐波分量的检测和选择。它适用于两种尖叫声，只允许我们考虑很少的频率。在这项研究中，将提出一种新方法，以便快速很好地估计自由空间中的噪声发射。该方法将基于制动系统的近似声功率，该声功率被假定为准时源，内插方向性和声功率水平的降低。该方法适用于两种具有一种和两种不稳定模式的尖叫的经典情况。它使我们能够很好地重建声功率级图。介绍了几种误差估计器，这些误差估计器显示重建的字段接近于使用完整BEM计算的参考值。

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  • 来源
    《Mechanical systems and signal processing》 |2015年第1期|732-756|共25页
  • 作者

    K. Soobbarayen; S. Besset; J-.J. Sinou;

  • 作者单位

    Laboratoire de Tribologie et Dynamique des Systemes, UMR CNRS 5513, Ecole Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France;

    Laboratoire de Tribologie et Dynamique des Systemes, UMR CNRS 5513, Ecole Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France;

    Laboratoire de Tribologie et Dynamique des Systemes, UMR CNRS 5513, Ecole Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Vibration; Friction; Squeal; Noise;

    机译：振动;摩擦;尖叫声噪声;

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