Design method of thin-shell-type acoustic superstructure in any curved surface shape

A design method and thin-shell structure technology, applied in the direction of sound-generating devices and instruments, can solve problems such as lack of design methods, achieve excellent low-frequency broadband sound insulation performance, and eliminate sound insulation troughs

Active Publication Date: 2019-09-10
XI AN JIAOTONG UNIV
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a lack of design methods in this area

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Design method of thin-shell-type acoustic superstructure in any curved surface shape
  • Design method of thin-shell-type acoustic superstructure in any curved surface shape
  • Design method of thin-shell-type acoustic superstructure in any curved surface shape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0049] (1) Broadband ultra-strong sound insulation thin shell structure design

[0050] Thin-shell structures are the most commonly used thin-walled structures in engineering. Commonly used thin-shell structures include rotating shells and cylindrical shells, or many structures are complex curved shell structures that are compounded or evolved from these two types of structures, such as attached figure 1 shown. Among the two commonly used thin shell structures, cylindrical shells are more widely used than rotary shells. However, considering that the cylindrical shell structure is not convenient for acoustic performance measurement, the present invention first designs a rotating shell structure for experimental verification. For comparison, two sets of structures (0# and 1#) of thin plate and hemispherical rotating shell are designed respect...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a design method of a thin-shell-type acoustic superstructure in any curved surface shape. The design method is used for design of a thin-shell-type low-and-medium-frequency broadband sound insulation structure, design of a curved surface shell-shaped ultra-thin light sound absorption structure, design of an ultra-thin carpet-type acoustic invisibility cloak fitting the complex curved surface shape, and the like. According to the thin-shell-type sound insulation structure designed through the method, after the curvature radius is decreased to a certain range, a sound insulation index curve can break through the cut-off frequency limit between a stiffness control area and a damping control area, the sound insulation trough at the cut-off frequency is eliminated, and excellent low-frequency broadband sound insulation performance is achieved. By properly selecting the separation distance between double-layer shells, a double-layer shell structure can achieve bianisotropic perfect sound absorption; and in order to adjust phase compensation of the designed complex curved surface shape structure and achieve the function of arbitrary adjusting and control of a wavefront phase, the equiphase design method is adopted, and the curved surface carpet-type acoustic invisibility cloak completely fitting the complex structure surface morphology can be designed.

Description

technical field [0001] The invention belongs to the technical field of acoustic superstructures, and in particular relates to a design method for a thin-shell acoustic superstructure with an arbitrary curved surface shape. Background technique [0002] Acoustic superstructure is an artificial composite structure with subwavelength dimensions. Through microstructure design, acoustic bandgap, negative equivalent mass density, negative bulk modulus, double negative equivalent parameters, negative refractive index, and negative shear can be realized. Modulus, total reflection, anomalous reflection / refraction, perfect sound absorption, sound focusing, self-collimation, anomalous Doppler effect, non-reciprocal sound transmission and many other strange physical phenomena. Therefore, it shows promising and extensive application prospects in vibration and noise suppression, acoustic imaging, acoustic energy focusing, metalens, waveguide and stealth. According to the working principl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G10K11/16G10K11/168
CPCG10K11/16G10K11/168
Inventor 马富银徐宜才吴九汇
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap