Composite sound absorption structure for improving set low frequency sound absorption performance
A sound absorption and performance technology, applied in the field of acoustics, can solve the problems of distortion or damage of sensitive components, poor low frequency sound absorption, etc., to achieve the effect of enhancing sound absorption capacity, improving sound absorption performance, and improving low frequency sound absorption performance
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[0049] Example 1:
[0050] In order to strengthen the sound absorption coefficient at a specific frequency of 960Hz, the upper felt layer 1, the lower felt layer 2 and the middle felt layer 3 are all selected from metal fiber felt with a porosity of 90% and the material is stainless steel. The diameter of the felt wire is 50μm; the film 5 is selected The modulus is 50Mp, the density is 1097kg / m 3 , The rubber material with Poisson's ratio of 0.33, mass 6 selects a modulus of 200GP and a density of 7870kg / m 3 , Aluminum block with Poisson's ratio of 0.3;
[0051] See attached Figure 4 , The composite sound-absorbing structure is evenly divided into a unit cell configuration, the unit cell configuration includes a through hole 4 and a film 5, when the through hole 4 is square or round, the side length of the through hole 4 The inner diameter is a, the thickness of the upper felt layer 1 is b1, the thickness of the lower felt layer 2 is b3, the thickness of the middle felt layer 3 is...
Example Embodiment
[0054] Example 2:
[0055] In order to strengthen the sound absorption coefficient at a specific frequency of 960Hz, the upper felt layer 1, the lower felt layer 2 and the middle felt layer 3 are all selected from metal fiber felt with a porosity of 90% and the material is stainless steel. The diameter of the felt wire is 50μm; the film 5 is selected The modulus is 50Mp, the density is 1097kg / m 3 , The rubber material with Poisson's ratio of 0.33, mass 6 selects a modulus of 200GP and a density of 7870kg / m 3 , Aluminum block with Poisson's ratio of 0.3;
[0056] See attached Figure 5 , The composite sound-absorbing structure is evenly divided into a unit cell configuration, the unit cell configuration includes a through hole 4 and a film 5, when the through hole 4 is formed by butting the large ends of two frustum-shaped cavities , The maximum inner diameter of the through hole 4 is a, the minimum inner diameter of the through hole 4 is c, c is To Between; the overall thickness ...
Example Embodiment
[0059] Example 3:
[0060] In order to strengthen the sound absorption coefficient at a specific frequency of 200Hz, the upper felt layer 1, the lower felt layer 2 and the middle felt layer 3 are selected from metal fiber felt with a porosity of 90% and a material of stainless steel, with a felt diameter of 50μm; the film 5 is selected The modulus is 50Mp, the density is 1097kg / m 3 , The rubber material with Poisson's ratio of 0.33, mass 6 selects a modulus of 200GP and a density of 7870kg / m 3 , Aluminum block with Poisson's ratio of 0.3;
[0061] See attached Figure 4 , The composite sound-absorbing structure is evenly divided into a unit cell configuration, the unit cell configuration includes a through hole 4 and a film 5, when the through hole 4 is square or round, the side length of the through hole 4 The inner diameter is a, the thickness of the upper felt layer 1 is b1, the thickness of the lower felt layer 2 is b3, the thickness of the middle felt layer 3 is b2, the thickn...
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