Acoustic shield based on acoustic wave band gap features of generalized photonic crystal semi-cylinder shells

Abstract

The invention provides an acoustic shield based on acoustic wave band gap features of generalized photonic crystal semi-cylinder shells. The acoustic shield based on the acoustic wave band gap features of the generalized photonic crystal semi-cylinder shells comprises a shield body. The shield body is a square shell formed by connecting five base boards. The bottom end of the shield body is provided with a bottom edge connecting plate. The bottom edge connecting plate is provided with a threaded hole. The shield body is connected with a base through the bottom edge connecting plate. The inner surface of each base board is evenly provided with at least two semi-cylinder grooves. Each semi-cylinder groove is provided with the generalized photonic crystal semi-cylinder shell. Each generalized photonic crystal semi-cylinder shell is provided with at least two period components from inside to outside. Each period unit is composed of a non-metal layer and a metal layer from inside to outside in sequence, and each non-metal layer and the corresponding metal layer are attached to each other. Every two adjacent period components are attached to each other. The acoustic shield has the advantages of being large in sound insulation factor, convenient to assemble, disassemble and transport, low in design and manufacturing cost and the like. The acoustic shield has good damping and noise reduction effect on vibration within a band gap range.

Description

technical field [0001] The invention relates to a sound insulation device, in particular to a sound insulation cover based on the sound wave bandgap characteristic of a generalized phonon crystal semi-cylindrical shell. Background technique [0002] With the improvement of living standards, people have higher and higher requirements for the quality of the environment they live in. In order to improve the acoustic environment, more and more noise control methods have been applied and researched. In practical engineering applications, there are mainly three ways to control noise: (1) control the sound source, that is, start from the sound source, improve the structural design of the sound source, and reduce the noise level emitted by the sound source; (2) control the sound field receiver The protective control means that people exposed to the noise environment artificially take certain protective measures to protect themselves from harm, generally by wearing ear protectors, re...

AI Technical Summary

Problems solved by technology

In actual engineering, it is necessary to regularly overhaul and maintain the sound insulation device and sound source equipment. It is often required that the sound insulation cover should be light and convenient, easy to assemble, disassemble and transport. However, the structure of the existing sound insulation cover is too heavy to meet the above requirements. Require

[0004] The use of existing sound insulation technology can certainly attenuate the vibration transmitted to the structure and the noise radiated to a certain extent, but at present, the noise generated during the operation of many pressurized equipment is extremely large. As far as the existing sound insulation cover is concerned In other words, the sound insulation is small, which is far from meeting the requirements

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