Sound-absorbing Panel With Asymmetric Double-Wave Corrugated Structure
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Solution Overview
Problem
Conventional corrugated cardboard lacks sound-absorption function, particularly for aural or speech perception, due to its intrinsic structure, resulting in negligible sound absorption.
Innovation Solution
A sound-absorbing panel composed of multiple layers of double-wave corrugated cardboard with a minimum height of 8.5 mm, made from flexing-resistant paper containing 30% recycled paper and 70% virgin cellulose, featuring non-aligned sinusoidal waves with an inclination of 15-45°, which dissipates sound energy through friction and vibration, enhancing absorption across a broader frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional corrugated cardboard structure is used, then manufacturing cost is low and ease of manufacture is high, but sound absorption capability is negligible
Solution Approach 1:
The patent changes the wave angle parameter from the conventional 0 degrees to between 15-45 degrees, and modifies the wave profile from standard sinusoidal to asymmetric sinusoidal. These parameter changes enable the cardboard structure to absorb sound effectively while maintaining the simple corrugated cardboard manufacturing process, thus improving sound absorption without significantly increasing manufacturing complexity
Solution Approach 2:
The patent introduces asymmetric sinusoidal wave profiles with non-aligned upper and lower waves, creating an asymmetric structure that disrupts sound wave propagation more effectively than symmetric conventional corrugated cardboard. This asymmetry enhances sound absorption by creating more varied paths for sound energy dissipation through friction and vibration
2Reliability
If double-wave corrugated cardboard with 8.5 mm height is used, then sound absorption is improved, but weight increases
Solution Approach 1:
The patent optimizes the wave height parameter to a minimum of 8.5 mm, which provides sufficient sound absorption performance. By setting this as a minimum rather than increasing it further, the patent achieves effective sound absorption while minimizing the weight increase that would result from taller waves
3Reliability
If non-aligned sinusoidal waves with 15-45° inclination are used, then sound absorption across broader frequency range is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a wave angle range of 15-45 degrees rather than a single precise angle, and requires non-aligned but not necessarily perfectly alternating waves. This range-based specification maintains sound absorption effectiveness while providing manufacturing tolerance, reducing the precision requirements compared to specifying exact angular measurements
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 panel achieves effective sound absorption by converting sound energy into kinetic energy, improving clarity and intelligibility of oral messages without the need for fibrous materials, offering a cost-effective, versatile, and easily implementable solution for reducing reverberation.
Implementation Method 1
by virtue of its roughness and its elasticity, makes it possible to also take advantage of dissipation deriving from friction and from vibration of the vertical walls of the waves
Implementation Method 2
dissipation deriving from friction and from vibration of the vertical walls of the waves
Implementation Method 3
the panel according to the invention has an acoustic absorption distributed over the whole spectrum of interest of aural perception
Implementation Method 4
dissipation of the sound wave occurs via conversion of the sound to kinetic energy when it passes through the material
Data Source
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AI summary
A sound-absorbing panel (1), composed of a series of layers (2) of double-wave corrugated cardboard, each one formed by an upper liner (3), an upper wave (6), an intermediate liner (5), a lower wave (7) and a lower liner (4). Each one of the layers (2) of double-wave corrugated cardboard, of the CC type with a minimum height of 8.5 mm, is made of paper that is resistant to flexing and with recycled paper containing virgin cellulose. Each one of the upper and lower waves (6, 7) has a mutually non-aligned sinusoidal wave shape (8a, 8b) and has an inclination of 15 - 45°.