Vehicle Acoustic Decoupling Layer Sealing Against Water Ingress
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Solution Overview
Problem
Existing acoustic protection systems for motor vehicles face challenges in preventing liquid penetration, particularly water, into the decoupling layer when it is close to the ground, while maintaining its compressibility and acoustic insulation properties.
Innovation Solution
The acoustic protection system incorporates an elastically compressible decoupling layer bagged in a plastic film pocket with a waterproof barrier and strategically positioned air passage orifices to prevent liquid penetration and allow air evacuation during compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the decoupling layer is placed close to the ground for acoustic protection, then acoustic insulation performance is improved, but liquid penetration risk increases
Solution Approach 1:
A waterproof pocket made of plastic film is introduced as an intermediary barrier between the decoupling layer and the external environment. The pocket encloses the decoupling layer completely, preventing direct contact with liquids while maintaining the acoustic insulation function. The pocket acts as a protective mediator that isolates the decoupling layer from harmful liquid penetration.
Solution Approach 2:
The decoupling layer is extracted from direct exposure to the environment and placed inside a sealed waterproof pocket. This separation removes the decoupling layer from the harmful liquid environment while preserving its acoustic function, allowing it to operate in a protected state.
2Object-affected harmful factors
If the decoupling layer is sealed in a waterproof pocket, then liquid protection is improved, but air compression during assembly becomes difficult
Solution Approach 1:
The pocket is designed with air passage orifices that allow air to escape during compression. These orifices create a controlled porous pathway that permits air evacuation while maintaining the overall waterproof seal of the pocket structure.
Solution Approach 2:
Air passage orifices are pre-provided in the pocket structure before assembly. This preliminary action ensures that air can escape during the compression process, preventing air trapping and making the assembly process easier while maintaining liquid protection.
3Ease of manufacture
If air passage orifices are provided in the pocket, then air evacuation during compression is improved, but liquid penetration risk through orifices increases
Solution Approach 1:
The orifices are positioned at a specific distance from the edge of the decoupling layer, creating a spatial separation. This dimensional arrangement allows air to pass through the orifices while the seal formed by the pocket's contact with the wall prevents liquid from reaching the orifices, effectively separating the air evacuation function from liquid exposure.
Solution Approach 2:
Different regions of the pocket have different functions: the orifices provide air passage in specific locations, while the sealed portions of the pocket maintain liquid protection. The seal around the orifices creates a localized protective zone that allows air flow while blocking liquid penetration.
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 configuration effectively protects the decoupling layer from liquids, ensures optimal damping performance by allowing compression, and reduces the need for additional damping materials, resulting in a simplified and lighter vehicle design.
Implementation Method 1
an elastically compressible acoustic decoupling layer arranged in compression at least along its periphery between said walls
Implementation Method 2
The presence of such a compressed decoupling layer provides a damping effect resulting in an improvement in the processing of 'structure-borne' noise
Implementation Method 3
said layer is bagged in a plastic film pocket closed so as to form a sealed barrier on said edge
Implementation Method 4
at least one air passage orifice is provided in said pocket opposite at least one of said faces, said orifice being arranged at a distance from said edge so as to provide around said orifice a seal produced by the support of said pocket on said corresponding wall
Data Source
Figure 1~2
AI summary
The invention relates to an acoustic protection system (1) for a motor vehicle, the system comprising: two walls (2, 3) extending opposite each other; an elastically compressible acoustic decoupling layer (4) arranged in compression at least along its periphery between the walls, the layer having two opposing faces (5, 6) pressed respectively against each of the walls, the faces being connected to each other by an edge (7), the layer being enclosed in a bag (8) made from plastic film closed so as to form a sealed barrier on the edge, at least one air passage hole (9) being provided in the bag opposite at least one of the faces, the hole being arranged at a distance (10) from the edge so as to provide, around the hole, a seal (11) created by the bag bearing on the corresponding wall.