Composite Damping Wall for Low-Frequency Sound Isolation
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Solution Overview
Problem
Traditional sound insulation walls are either heavy with poor low-frequency sound isolation or lightweight with limited overall sound insulation performance, failing to meet modern architectural demands for high strength, lightweight, and wide-band low-frequency sound insulation.
Innovation Solution
A composite damping lightweight sound insulation wall with a sandwich structure comprising lightweight sound insulation layers, composite damping layers, and a sound absorption matching layer, utilizing shear columns, air layers, and Helmholtz resonant cavities to dissipate and absorb sound energy effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional brick-and-earth sound insulation walls are used, then sound insulation performance is improved, but weight increases and low-frequency sound isolation deteriorates
Solution Approach 1:
The patent employs a composite structure combining lightweight sound insulation layers, composite damping layers with viscoelastic materials, and sound absorption matching layers. This multi-material composite approach achieves effective sound insulation without requiring heavy mass, directly resolving the contradiction between sound insulation performance and wall weight.
Solution Approach 2:
The patent changes the physical parameters of the sound insulation wall by using thin-layer composite structures with optimized thickness parameters (total thickness 30-60mm) and specific material properties. This allows achieving good sound insulation performance with significantly reduced weight compared to traditional brick walls.
2Weight of stationary object
If lightweight sound insulation walls are used, then weight is reduced, but low-frequency sound insulation performance deteriorates
Solution Approach 1:
The patent applies local quality enhancement by introducing composite damping layers with viscoelastic materials at specific positions within the wall structure. These localized damping elements specifically target low-frequency sound insulation without increasing overall wall weight, as the damping materials are applied in thin layers rather than bulk additions.
Solution Approach 2:
The sound absorption matching layer acts as an intermediary between the lightweight sound insulation layers and the composite damping layers. This intermediate layer with porous sound-absorbing material and Helmholtz resonant cavities bridges the performance gap, enabling lightweight construction to achieve improved low-frequency sound insulation through its special acoustic absorption mechanism.
3Weight of stationary object
If wall thickness is reduced for lightweight construction, then weight and material usage are reduced, but sound insulation performance deteriorates
Solution Approach 1:
The patent uses composite materials with different acoustic impedance characteristics in each layer. The lightweight sound insulation layers, composite damping layers, and sound absorption matching layers work synergistically, allowing thin total thickness (30-60mm) to achieve effective sound insulation through the combined acoustic properties of the composite structure rather than relying on mass alone.
Solution Approach 2:
The patent segments the sound insulation wall into three functional layers with distinct roles: lightweight sound insulation layers for high-frequency blocking, composite damping layers for low-frequency vibration damping, and sound absorption matching layers for broadband absorption. This segmentation allows each thin layer to perform its specific function efficiently, achieving overall good sound insulation performance despite reduced total thickness.
4Ease of manufacture
If conventional sound insulation structures are used, then manufacturing simplicity is maintained, but overall sound insulation performance deteriorates
Solution Approach 1:
The patent segments the sound insulation wall into three separate functional layers that can be manufactured and assembled independently. The lightweight sound insulation layers, composite damping layers, and sound absorption matching layers can be produced separately using different optimized processes, then combined to achieve superior overall performance while maintaining reasonable manufacturing simplicity through modular assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure achieves thin thickness, light weight, and excellent sound insulation performance across a wide frequency range, reducing sound wave transmission and resonance, making it suitable for various building applications.
Implementation Method 1
each of the composite damping layers includes damping layers, shear columns, and an air layer
Implementation Method 2
the Helmotz resonant cavities are tilted and embedded inside the porous sound-absorbing material
Implementation Method 3
the sound absorption matching layer consists of porous sound-absorbing material, Helmholtz resonant cavities, and light steel furring
Implementation Method 4
each of the damping layers is a silicone-based viscoelastic damping plate
Data Source
AI summary
Disclosed is a composite damping lightweight sound insulation wall, including lightweight sound insulation layers, composite damping layers and a sound absorption matching layer, the composite damping layers are positioned on both sides of the sound absorption matching layer, and the lightweight sound insulation layers are positioned on outer surfaces of the composite damping layers; each of the composite damping layers includes damping layers, shear columns and an air layer, the damping layers are respectively arranged on both ends of the shear columns, the shear columns are periodically distributed along the damping layers, and the air layer is located between the adjacent damping layers; and the sound absorption matching layer includes porous sound-absorbing material, Helmholtz resonant cavities and light steel furring, the light steel furring are snap-fitted on both sides of the porous sound-absorbing material, and the Helmholtz resonant cavities are embedded inside the porous sound-absorbing material.