Manufacturing method of one-dimensional ideal acoustic black hole wedge block

Abstract

The invention discloses a manufacturing method of a one-dimensional ideal acoustic black hole wedge block. According to the method, a shell with the cross section of an inner cavity being rectangularand the top face opened, and a cushion block are manufactured, the cushion block is formed by a first rectangular block and a second rectangular block, the top face of the second rectangular block isan arc-shaped face, the bottom side of the arc-shaped face is flush with the top face of the first rectangular block, and the arc-shaped face meets the arc-shaped curvilinear equation; the cushion block is arranged in the inner cavity of the shell, the top side of the arc-shaped face of the top face of the second rectangular block is flush with the top face of the shell, and a cavity is formed between the top face of the cushion block and the top face of the shell; an ideal acoustic black hole structure material is fused into the liquid state and then poured into the cavity, a die-casting machine is adopted for pressing the material into the top face of the shell, after heat is preserved for a certain period of time, the ideal acoustic black hole structure material is cooled and formed, and a strip wedge block is formed; and the strip wedge block is taken out from the cavity, and the one-dimensional ideal acoustic black hole wedge block is obtained. According to the method, the situation that tip truncation occurs to the one-dimensional acoustic black hole structure in the machining process is avoided, the requirement of the surface of the wedge structure is met, and the energy aggregation effect of the acoustic black hole structure is ensured.

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...

AI Technical Summary

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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