Soundproof Member Layer Configuration for Acoustic Performance
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Solution Overview
Problem
Existing soundproof members lack a systematic approach to achieve desired soundproof characteristics, often requiring trial and error in configuring their layers.
Innovation Solution
A soundproof member comprising a specific configuration of layers, including a first and second elastic porous body layer, each with defined thickness, bulk density, and Young's modulus, along with first and second film layers, arranged in a particular order to optimize soundproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trial and error is used to configure soundproof member layers, then soundproof characteristics can be evaluated, but development time and complexity increase
Solution Approach 1:
The patent applies parameter changes by systematically varying specific parameters of the elastic porous body layers (thickness, bulk density, Young's modulus) and film layers (air permeability, thickness) to achieve desired soundproof characteristics. The invention identifies optimal parameter ranges through theoretical analysis rather than trial and error, thereby resolving the contradiction between achieving reliable soundproof performance and reducing development complexity
Solution Approach 2:
The patent employs preliminary action by establishing theoretical design guidelines and parameter specifications before actual soundproof member fabrication. By pre-determining the optimal configuration parameters based on acoustic theory and numerical simulations, the invention eliminates the need for subsequent trial and error testing, thus reducing both development time and configurational complexity while ensuring reliable soundproof performance
2Reliability
If layer thickness is increased to improve soundproofing, then transmission loss improves, but member thickness and weight increase
Solution Approach 1:
The patent applies composite materials by combining elastic porous body layers with film layers having specific air permeability characteristics. This composite structure achieves high transmission loss with reduced total thickness compared to using single-material thick layers, as the combination of porous sound-absorbing material and controlled-permeability film creates synergistic soundproofing effects that are more efficient per unit thickness
Solution Approach 2:
The patent implements local quality by assigning different functional properties to different layers within the soundproof member. The elastic porous body layers provide sound absorption with specific density and thickness characteristics, while the film layers provide selective air permeability control. This localized optimization of material properties throughout the structure achieves superior transmission loss without requiring uniform increases in overall member thickness
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 proposed configuration achieves excellent soundproof characteristics by enhancing both transmission loss and insertion loss, as demonstrated by numerical simulations.
Implementation Method 1
a first elastic porous body layer; a first film layer; a second elastic porous body layer; and a second film layer, the layers being arranged in the stated order from a sound source side
Implementation Method 2
each have: a thickness of 0.5 mm or more and 10 mm or less; a bulk density of 25 kg/m 3
Data Source
Figure 1
Figure 2A~2C
AI summary
Provided is a soundproof member having excellent soundproof characteristics. The soundproof member includes: a first elastic porous body layer (10); a first film layer (12); a second elastic porous body layer (20); and a second film layer (22), the layers being arranged in the stated order from a sound source (S) side, wherein the first elastic porous body layer (10) and the second elastic porous body layer (20) each have: a thickness of 0.5 mm or more and 10 mm or less; a bulk density of 45 kg/m3 or more and 550 kg/m3 or less; and a Young's modulus of 7,000 Pa or more and 28,000 Pa or less, and wherein a total (L1/Λ1+L2/Λ2) of a ratio (L1/Λ1) of the thickness L1 (mm) of the first elastic porous body layer (10) to a viscous characteristic length Λ1 (µm) thereof and a ratio (L2/Λ2) of the thickness L2 (mm) of the second elastic porous body layer (20) to a viscous characteristic length Λ2 (µm) thereof is 0.11 or more.