Method for making one-dimensional ideal acoustic black hole wedge
A production method and wedge-shaped block technology, which can be applied to sound-producing instruments, instruments, etc., can solve the problems of increasing the reflection coefficient of sound waves, affecting the energy accumulation effect of acoustic black hole structures, and difficulty of ideal acoustic black hole wedge-shaped blocks.
Active Publication Date: 2021-03-30
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
[0003] like figure 1 As shown, among the two surfaces of the wedge-shaped block 1 of the one-dimensional ideal acoustic black hole structure, one side is a plane, and the height of the other side satisfies h(x)=εx m , m≥2, however, limited by the processing technology, the ideal acoustic black hole wedge is difficult to realize in actual processing, and it will often be cut off when the thickness of the wedge structure decreases to a certain value, which will significantly increase the acoustic reflection coefficient and seriously affect the Energy Concentration Effects of Acoustic Black Hole Structures
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[0021] Example Figure 2 to Figure 5 As shown, the manufacturing method of the one-dimensional ideal acoustic black hole wedge of the present invention comprises the following steps:
[0022] Step 1. Make the casing 1 and the spacer 2 with a rectangular inner cavity cross-section and an open top surface, respectively. The spacer 2 includes a first rectangular block 21 and a second rectangular block 22 arranged in parallel. The second rectangular block The top surface of the block 22 is an arc surface 23 and the base of the arc surface 23 is flush with the top surface of the first rectangular block 21, and the arc curve of the arc surface 23 satisfies the equation h(x)=εx m ,m≥2, where h and x are the ordinate and abscissa of the arc curve respectively, m is the shape parameter, ε is the correction coefficient;
[0023] Step 2. Place the spacer 2 in the inner cavity of the housing 1, and the inner cavity surface of the housing 1 and the circumferential surface of the spacer 2 ...
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Abstract
The invention discloses a method for manufacturing a one-dimensional ideal acoustic black hole wedge. The method manufactures a shell with a rectangular inner cavity section and an open top surface and a cushion block. The cushion block is composed of a first and a second rectangular block. The top surface of the rectangular block is arc-shaped and the bottom edge of the arc-shaped surface is flush with the top surface of the first rectangular block, and the arc-shaped surface satisfies the arc curve equation; the spacer is placed in the inner cavity of the shell, and the top surface of the second rectangular block is arc-shaped The top edge of the surface is flush with the top surface of the shell, and a cavity is formed between the top surface of the pad and the top surface of the shell; the ideal acoustic black hole structure material is melted into a liquid state and poured into the cavity, and pressed on the shell by a die-casting machine On the top surface, after a period of heat preservation, the ideal acoustic black hole structural material is cooled and formed to form a long wedge; the long wedge is taken out of the cavity to obtain a one-dimensional ideal acoustic black hole wedge. The method avoids tip truncation of the one-dimensional acoustic black hole structure during processing, meets the surface requirements of the wedge-shaped structure, and ensures the energy accumulation effect of the acoustic black hole structure.
Description
technical field [0001] The invention relates to a manufacturing method of a one-dimensional ideal acoustic black hole wedge. Background technique [0002] The acoustic black hole effect is a phenomenon in which the wave propagation velocity in the structure is gradually reduced by using the gradient change of the geometric parameters or material characteristic parameters of the thin-walled structure. Ideally, the wave velocity is reduced to zero so that no reflection occurs. The main method to realize the acoustic black hole effect is to process the thin plate into a wedge-shaped structure. In the thin-plate wedge-shaped structure, if the thickness of the structure decreases according to a certain power function, the bending wave velocity will decrease with the decrease of the thickness. In an ideal Under the circumstances, the wave speed can be reduced to zero, so as to realize the zero reflection of the wave, and the wedge-shaped structure is a one-dimensional ideal acoust...
Claims
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IPC IPC(8): B23P15/00G10K11/16
CPCB23P15/00G10K11/16
Inventor 李振华李鑫生管柯君李振宇
Owner UNIV OF SHANGHAI FOR SCI & TECH