Multilayer Board With Sloped Slots for Solid-Borne Sound
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Solution Overview
Problem
Conventional multilayer boards designed to reduce solid-borne sound radiation often compromise mechanical stability under load, as large slots can lead to deformation and tensile/shear stress, which is a concern in applications like aircraft interior paneling where both acoustic and structural integrity are crucial.
Innovation Solution
A multilayer board design featuring a core layer with sloped slots that close under external force, maintaining mechanical stability and reducing deformation, achieved by strategically arranging the slots to create a compact, coherent core layer with a shear rigidity that balances acoustic and structural performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If large slots are used in the core layer to reduce solid-borne sound radiation, then sound radiation is reduced, but mechanical stability deteriorates
Solution Approach 1:
The patent applies asymmetry by designing slots with non-parallel sides where one side is inclined at an angle to the other. This asymmetric geometry allows the slot to close under compressive load while maintaining structural integrity, resolving the contradiction between sound reduction and mechanical stability
Solution Approach 2:
The patent implements dynamics by designing slots that can change their state from open to closed depending on the applied load. Under compression, the sloped sides cause the slot to close, dynamically adapting the structure to maintain strength while preserving acoustic damping properties when unloaded
2Object-generated harmful factors
If slots are made larger to improve acoustic performance, then sound radiation reduces, but deformation under load increases
Solution Approach 1:
The asymmetric slot design with inclined sides prevents excessive deformation under load by creating a geometric constraint that resists opening, while still allowing sufficient slot size for acoustic performance
3Object-generated harmful factors
If slots are made larger to enhance sound absorption, then acoustic performance improves, but tensile and shear stress increase
Solution Approach 1:
The non-parallel-sided slot configuration creates geometric resistance to tensile and shear stresses, as the inclined sides interlock and distribute stresses more effectively than parallel-sided slots of the same size
Solution Approach 2:
The dynamic closing mechanism under compressive load reduces the effective slot size during high-stress conditions, thereby reducing tensile and shear stress concentrations while maintaining acoustic performance under normal conditions
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 design effectively suppresses sound radiation while maintaining high flexural strength and structural integrity, even under extreme loads, by allowing the sloped slots to close and behave like a solid core, thus enhancing both acoustic and mechanical performance.
Implementation Method 1
the at least one core layer comprises at least one first sloped slot... which slot in relation to the normal on the surface on which the slot is formed does not extend parallel but instead at an angle into the core layer
Implementation Method 2
Multilayer board for reducing solid-borne sound radiation... in the low frequency range the occurrence of lateral flexural waves is observed whose speed is determined by the overall flexural strength of the multilayer board
Data Source
AI summary
A multilayer board for reducing solid-borne sound radiation with improved mechanical stability when subjected to a load, comprising a first cover layer, a second cover layer, and at least one core layer, wherein the at least one core layer is arranged between the first and the second cover layer, and wherein the at least one core layer comprises at least one first sloped slot.