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AssigneeInstitute of Acoustics, Chinese Academy of Sciences
InventorsYadong Lu, Dong Liu, Qiang Wang
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The present invention provides an acoustic attenuation based on sound ray deflection theory and a muffler. The method of the present invention provides a temperature gradient between the interior and the exterior of the chamber of the muffler through the low temperature refrigeration system, in which the temperature inside the pipe wall is higher than that outside the pipe wall. The said temperature gradient may deflect the acoustic ray towards the low temperature direction, so as to capture and reduce the noise. The muffler of the present invention comprises a muffler housing laid with a sound absorbing structure (4) on its internal surface, is characterized by the low temperature refrigerating system (2) which is fixed in the position corresponding to the sound absorbing structure (4) on the external surface of the muffler housing (1), covers at least 5% of the area of the external surface of muffler housing (1), and is used to realize quantitative control of the temperature gradient together with a temperature control system (3). The muffler of the present invention effectively improves the noise-absorbing effect of the prior muffler.
An acoustic attenuation method based on the acoustic ray deflection theory, comprises of providing a temperature gradient, in which the temperature on the outer surface of the wall of the chamber is lower than that of the interior of the chamber, between the interior and the exterior of the chamber through a low temperature refrigeration system fixed on the external surface of the pipe wall of a muffler;
A muffler based on acoustic ray deflection theory, including a muffler housing laid with a sound absorption structure (4) on its internal surface, is characterized in that, the external surface of the said housing (1) is provided with a low temperature refrigeration system (2), covering at least 5% of the area of the external surface of the muffler housing (1), in the position corresponding to the sound absorption structure (4).
Dependencies are inferred from the claim text.