Air-Permeable Road Surface Element for Roller Test Bench Noise Reduction
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Solution Overview
Problem
Existing road surface elements for roller test stands fail to minimize tire noise effectively, as smooth surfaces lead to 'smacking' due to vacuum creation, while roughening surfaces increases noise levels, and existing solutions do not adequately address this conflict.
Innovation Solution
An air-permeable road surface element with a smooth outer surface and a permeable covering layer that allows airflow, reducing the vacuum effect and minimizing noise through a design that includes a filter material or metal structure with an open-pored structure, and the application of elastic or plastic granules for further noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the surface of the road surface element is made smooth, then the rolling noise is reduced, but the tire causes 'smacking' due to vacuum creation when detaching from the surface
Solution Approach 1:
The road surface element incorporates an air-permeable covering layer with porous structure that allows air to pass through. This prevents vacuum formation between the tire and surface during detachment, eliminating the 'smacking' noise while maintaining a smooth outer surface for reduced rolling noise.
Solution Approach 2:
The covering layer provides different properties at different levels: a smooth outer surface for noise reduction and an air-permeable internal structure to prevent vacuum effects. This local differentiation of surface quality resolves the contradiction between smoothness and vacuum prevention.
2Object-generated harmful factors
If the surface of the road surface element is roughened to avoid 'smacking', then the vacuum effect is reduced, but the rolling noise increases
Solution Approach 1:
Instead of roughening the outer surface, the invention uses a porous covering layer that allows air permeability while maintaining a smooth outer surface. This resolves the contradiction by providing vacuum prevention through internal porosity rather than external roughness.
Solution Approach 2:
The air-permeable covering layer acts as an intermediary between the tire and the underlying structure, allowing air to pass through and prevent vacuum formation without requiring the tire to contact a rough surface, thus avoiding increased rolling noise.
3Object-generated harmful factors
If an air-permeable covering layer is added to the road surface element, then the vacuum effect is reduced and 'smacking' is minimized, but the device complexity increases
Solution Approach 1:
The covering layer is made from air-permeable materials such as filter fabrics, wire meshes, or sintered metals that inherently provide both structural integrity and air permeability. These materials achieve the vacuum prevention function without requiring complex multi-component structures.
Solution Approach 2:
The road surface element combines the air-permeable covering layer with the base shell to create a composite structure that integrates noise reduction and vacuum prevention functions in a single unified component, avoiding the need for separate systems.
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 air-permeable design significantly reduces tire noise during rolling by minimizing the vacuum effect and providing a stable, acoustically optimized surface, achieving a noise reduction of at least 3 dB, while maintaining structural integrity and smooth contact with the tire.
Implementation Method 1
it is proposed to provide a smooth surface for the covering shell or the road surface and to make this surface additionally permeable to air
Implementation Method 2
The covering layer can have an open-pored structure, which allows air to circulate
Data Source
Figure 1a~1c
Figure 2~3
AI summary
The present invention relates to a road surface element B and a road surface for a vehicle roller test stand, which are optimized for acoustic measurements on the vehicle. The road surface B has a surface layer with an outer surface A, wherein the surface layer 1 is at least partially air-permeable, so that, in particular, an airflow through the outer surface A is permitted.