Laminated Sound-Absorbing Material for Wide Frequency Range
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Solution Overview
Problem
Conventional sound-absorbing materials using non-woven fabrics are limited in their ability to absorb sound across a wide frequency range from low to high frequencies, necessitating the development of a more effective solution for enhanced sound absorption performance.
Innovation Solution
A laminated sound-absorbing material is created using a base material sheet and a skin material sheet with different basis weights, where the skin material sheet is sandwiched between the base material sheets, allowing for improved sound absorption across a wide frequency range, and this material is integrated with a wiring harness to streamline installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only one non-woven fabric is used as a sound-absorbing material, then sound absorption performance in a specific frequency range is enhanced, but sound absorption performance in a wide frequency range from low to high frequency cannot be exhibited
Solution Approach 1:
The sound-absorbing material is divided into multiple non-woven fabric layers with different basis weights. The first and second non-woven fabrics with different basis weights are arranged in a stacked manner, where each layer targets specific frequency ranges. This segmentation allows the material to absorb sound across a broad spectrum from low to high frequencies by combining the complementary absorption characteristics of each layer.
Solution Approach 2:
The invention creates a composite sound-absorbing material by combining multiple non-woven fabrics with different basis weights into a single integrated structure. The first non-woven fabric with a first basis weight and the second non-woven fabric with a second basis weight (different from the first) form a composite system that exhibits enhanced sound absorption performance across wide frequency ranges, leveraging the synergistic effects of materials with different acoustic properties.
2Ease of operation
If sound-absorbing material and wiring harness are installed separately, then installation flexibility is maintained, but time and labor for mounting are increased
Solution Approach 1:
The sound-absorbing material is integrated with the wiring harness into a single unified component. The first and second non-woven fabrics are combined with the wiring harness structure, creating an integrated assembly that performs both sound absorption and electrical wiring functions simultaneously. This merging eliminates the need for separate installation steps, reducing mounting time and labor while maintaining installation flexibility through the integrated design.
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 laminated sound-absorbing material effectively absorbs sound across a wide frequency range, reducing the time and labor required for installation, and provides a shock-absorbing effect when integrated with a wiring harness, enhancing both sound absorption and silencing performance.
Implementation Method 1
a sound-absorbing material using non-woven fabrics... capable of absorbing sound in a wide frequency range from a low frequency to a high frequency
Data Source
AI summary
It is aimed to provide a sound-absorbing material and a sound-absorbing-material equipped wiring harness capable of absorbing sound in a wide frequency range from a low frequency to a high frequency. A sound-absorbing material 1 is a laminated sheet in which a base material sheet 3 and a skin material sheet 2 having a smaller basis weight than the base material sheets 3 are laminated, the base material sheet 3 includes at least a first base material sheet 31 and a second base material sheet 32 and the skin material sheet 2 is arranged between the first and second base material sheets 31, 32. The sound-absorbing material 1 and a wiring harness 7 are integrated into a sound-absorbing-material equipped wiring harness 6.