Abstract
In order to deal with the acoustic radiation from rotating sources, this paper describes a frequency-domain numerical method for predicting sound radiation. The method is based on the analytical Green’s function of rotating monopole and dipole source in free space. Sound radiation model is established and characteristics of sound field are discussed by numerical simulation and the relationship between radiated sound frequencies and acoustic nature frequency of source, angular frequency and its harmonics can be revealed .The radiated sound field has a strong directivity, fundamental frequency transmitting in the rotary shaft direction and harmonics spreading along radial direction and frequency shift phenomena appearing clearly in higher rotating speed of source. The method has a theoretical significance for exploring the low-noise rotating machinery.
Highlights
Due to the relative motion between medium and sound source, the sound radiation of moving source has become the difficulty in acoustic domain
M.V.Lowson derived firstly acoustic equations from rotating point force .The equations is applied to predict the sound radiation of rotor and the prediction pressure is exact, but the equation is only used to rotor in free field and the rotor is often in case or in box, the effect from the boundaries is neglect
The analytical Green’s function and sound pressure model of rotating dipole sources is derived in the frequency domain
Summary
Due to the relative motion between medium and sound source, the sound radiation of moving source has become the difficulty in acoustic domain. M.V.Lowson derived firstly acoustic equations from rotating point force .The equations is applied to predict the sound radiation of rotor and the prediction pressure is exact, but the equation is only used to rotor in free field and the rotor is often in case or in box, the effect from the boundaries is neglect. This will give more inaccurate for the prediction pressure. The results are presented in section[4].The analytical method provided important theoretical value for the research of sound radiation and noise control of moving source
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