Multi-layer Patch Assembly for Targeted Sound Damping
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Solution Overview
Problem
Existing sound damping technologies in the automotive industry, such as free-layer, constrained-layer, and laminates, are limited in their ability to selectively dampen noise and vibrations in specific areas of metal parts, particularly in vehicle components, where uniform damping is not always necessary and can be inefficient in managing varying noise and vibration levels.
Innovation Solution
A multi-layer patch assembly comprising a main panel, primary and auxiliary adhesive layers, and individual patches of varying sizes and materials, strategically applied to acoustically active regions to enhance sound damping, thermal insulation, and structural integrity, with the ability to withstand metal forming operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If uniform sound damping is applied across the entire metal panel, then overall noise reduction is achieved, but material usage increases and cost rises
Solution Approach 1:
The patent divides the sound damping solution into multiple discrete patches that are strategically placed only in acoustically active regions of the metal panel, rather than applying a continuous layer across the entire surface. This segmentation allows targeted noise reduction while minimizing material consumption in areas where damping is not needed.
Solution Approach 2:
The patent implements local quality by varying the properties and placement of damping patches according to the specific acoustic characteristics of different panel regions. Patches are applied selectively to high-vibration areas while leaving low-vibration areas untreated, optimizing the noise reduction effect per unit of material.
2Object-affected harmful factors
If multiple layers of damping material are applied, then sound damping performance improves, but manufacturing complexity increases
Solution Approach 1:
The multi-layer damping structure is segmented into discrete patches that can be manufactured and applied independently. Each patch maintains a multi-layer construction for optimal damping performance, but the segmented approach simplifies the overall manufacturing process compared to applying continuous multi-layer coverage across the entire panel.
Solution Approach 2:
The patent applies multi-layer damping selectively only where acoustic performance requires it, rather than uniformly across the entire panel. This partial application of complex multi-layer structures reduces overall manufacturing complexity while maintaining high damping performance in critical areas.
3Reliability
If damping patches are applied before metal forming, then the panel assembly can withstand forming operations, but the patches may deform or delaminate
Solution Approach 1:
The damping patches are applied to the metal panel before the forming operation, allowing the adhesive to bond the patches to the panel surface in advance. This preliminary application enables the patches to withstand the subsequent forming process while maintaining their structural integrity and adhesion.
Solution Approach 2:
The patent uses composite material construction for the damping patches, combining viscoelastic damping layers with adhesive layers that provide strong bonding to the metal panel. This composite structure enhances the patches' ability to withstand deformation during metal forming operations while maintaining integrity.
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 multi-layer patch assembly effectively reduces noise and vibrations, provides tailored damping performance across different frequencies and temperatures, and enhances structural integrity by using multiple layers and adhesive layers with varying properties to optimize sound damping and thermal resistance.
Implementation Method 1
The viscoelastic material absorbs and dissipates the vibrational energy generated by the article by converting mechanical energy associated with the vibrations into thermal energy that is dispersed within the sound damping material layer
Implementation Method 2
a primary adhesive layer attaches the multi-layer patch to the main panel at the acoustically active region for sound damping
Data Source
AI summary
A panel assembly with a multi-layer patch may be used in any number of different applications in order to reduce noise or vibrations, provide thermal insulation, and/or improve the structural integrity of an underlying part. In an exemplary embodiment where the panel assembly is a vehicle part, the panel assembly includes a main panel, a primary adhesive layer, and a multi-layer patch that includes at least two individual patches and at least one auxiliary adhesive layer. The primary adhesive layer attaches the multi-layer patch to the main panel, and the auxiliary adhesive layer attaches the individual patches together. The size, shape, thickness and/or composition of the different layers of the multi-layer patch may be specifically chosen to exhibit certain sound and/or thermal damping properties.