Partition Wall Dynamic Absorber for Low-Frequency Sound Insulation
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Solution Overview
Problem
Existing dynamic absorbers for sound insulation in building elements face challenges such as mechanical interference and high installation costs due to the need for mechanical links and complex attachment mechanisms, which are inefficient for low-frequency sound absorption.
Innovation Solution
A building element with a dynamic absorber integrated into the wall, featuring a cavity with a mass and a supporting element formed by a support sheet, where a layer of air separates the mass from the cavity bottom, allowing the mass to oscillate freely and absorb low-frequency vibrations without mechanical interference, and optionally incorporating a duct for enhanced air communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dynamic absorber with mechanical attachment means is used, then the mass can be securely linked to the wall, but the installation cost and complexity increase due to additional fixation components and time
Solution Approach 1:
The support sheet is integrated directly into the wall structure during manufacturing, merging the attachment function with the wall itself. This eliminates separate fixation components and reduces installation complexity while maintaining secure attachment of the dynamic absorber mass
Solution Approach 2:
The support sheet serves multiple functions: it acts as both the attachment mechanism for the mass and as part of the wall structure itself. This multi-functionality reduces the number of separate components needed and simplifies the overall system
2Reliability
If a mass is allowed to oscillate freely for low-frequency absorption, then sound insulation effectiveness improves, but mechanical interference may occur between the mass and cavity bottom
Solution Approach 1:
An air layer is introduced as an intermediary between the oscillating mass and the cavity bottom. This air cushion allows the mass to oscillate freely for effective low-frequency sound absorption while preventing direct mechanical contact and interference with the cavity bottom
Solution Approach 2:
The air layer functions as a pneumatic element that provides the necessary compliance and separation. The compressible air cushion enables the mass to move during oscillation without rigid mechanical constraints, maintaining both freedom of movement and prevention of mechanical interference
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
This solution effectively reduces acoustic transparency in low frequencies while minimizing installation costs and mechanical interference, providing efficient sound absorption within the building element.
Implementation Method 1
at least one layer of air is provided between the mass and a bottom of the cavity. Such a layer of air avoids any mechanical interference between the mass and the bottom of the cavity, especially when the mass oscillates
Implementation Method 2
The dynamic absorber is configured to absorb low-frequency vibrations, i.e. vibrations with a frequency of less than 500 Hz, generated by the resonance input of two walls assembled together
Implementation Method 3
the dynamic absorber has a cavity which, seen from the front, has an outline at least partly rounded... the mass, seen from the front, has an external periphery inscribed in the cavity
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a partition (2) intended to provide separation between two spaces in a building, the partition (2) comprising at least one layer of a construction material (4) against which at least one support sheet (5) is affixed, the partition (2) comprising at least one dynamic absorber (7) which includes at least one cavity (9), a mass (8), and a load-bearing element (6) for the mass (8). According to the invention, at least one cavity is formed in the construction material, and the load-bearing element (6) for the mass (8) is at least partially formed by the support sheet (5).