Minimization of radiated sound power from structures using shape techniques

Prediction of radiated sound power from vibrating structures using the surface contribution method

A common measure for near-field acoustic energy of a vibrating structure is the acoustic intensity, which usually has positive and negative values that correspond to energy sources and sinks on the surface of the radiating structure. Sound from source and sink areas partially cancel each other and only a fraction of the near-field acoustic energy reaches the far-field. In this paper, an alterna...

The Estimation of the Sound Power Radiated from Modified Structures by the Modal Synthesis Method

This paper describes the estimation of the sound power radiated from a modified structure using an aluminum plate es asimple example. The modal parameters of the original, unmodified aluminum plate are first determined by the experimental modal analysis. Second, those of the modified aluminum plate are calculated by the Modal Synthesis Method. Using these obtained modal parameters, the three fa...

Estimated Sound Power Radiated by Surfaces on a Continuous Miner Tail Section Using Vibration Measurements

Miners in underground coal mines experience prolonged exposure to high noise levels, often with A-weighted sound levels in excess of 90 dB. Field tests have shown that the continuous miner conveyor is a dominant noise source. This paper will identify the most significant noise-radiating surfaces on the continuous miner tail section using vibration levels and surface areas to estimate the sound ...

Prediction of the radiated sound power from a fluid-loaded finite cylinder using the surface contribution method

Based on acoustic radiation modes, the surface contribution method has been developed to predict the surface contributions to the radiated sound power from a vibrating structure. In this work, the surface contribution method is used to identify the sound field on a vibrating structure submerged in a heavy fluid. It was recently found that surface contribution method was not able to predict the ...

Remarks on the Calculation of Radiated Sound from Compressor Shell Side Walls Using Equivalent Cylinders