Tetrahedral Texturing Elements for Road Noise Reduction
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Solution Overview
Problem
Existing road surfaces fail to effectively reduce noise pollution while maintaining durability and economic efficiency, as conventional grits and noise-reducing materials often increase noise levels or are costly and scarce.
Innovation Solution
The use of tetrahedral texturing elements with specific curvature and compressive strength, made from high-strength materials like concrete or ceramic, which are rolled, pressed, or rubbed into the road surface to create a low-noise, durable, and grippy surface by minimizing tire deformation and air pumping noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional grits or noise-reducing materials are used on road surfaces, then noise generation may be reduced, but the materials are costly, scarce, or may actually increase noise levels
Solution Approach 1:
The patent applies spherical texturing elements with a diameter of 0.5-2.0 mm to the road surface. These spherical particles create a specific surface geometry that reduces tire-road noise by minimizing air pumping effects while maintaining acceptable grip levels. The spherical shape distinguishes this solution from conventional angular grit materials.
Solution Approach 2:
The patent changes the geometric parameters of the surface texturing elements by using spheres with specific diameter ranges (0.5-2.0 mm) rather than conventional angular shapes. This parameter change optimizes the balance between noise reduction and grip, while the materials used (glass beads, ceramic spheres, or recycled plastic granules) are economically viable and widely available.
2Ease of operation
If tetrahedral particles are used to increase grip, then road surface grip is improved, but noise generation increases
Solution Approach 1:
The patent deliberately chooses spherical texturing elements instead of tetrahedral or angular particles. The spherical geometry reduces the air pumping effect that occurs when tires roll over sharp-edged particles, thereby reducing noise generation while still providing adequate grip through the spherical surface contact.
Solution Approach 2:
The patent changes the shape parameter from angular (tetrahedral) to spherical, and optimizes the size parameter to 0.5-2.0 mm diameter. This parameter optimization achieves a balance where the rounded surfaces provide sufficient friction for grip while minimizing the aerodynamic noise generation associated with sharp edges.
Data Source
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AI summary
The application relates to structuring elements (1) for the gritting or noise-reduction of road surfaces, having a tetrahedral basic shape with a distance of 2-10 mm between two vertices, the structuring elements having concave surfaces with a ratio of arc height to distance between two vertices ranging from 0.05-0.35, and a compressive strength of at least 120 MPa determined according to DIN EN 196-1. The application further relates to a method for producing or repairing road surfaces, in which the structuring elements (1) are spread on and ground into the wearing course (2) while the same is still in a plastic state, and to the use of the structuring elements (1) for the gritting or noise-reduction of road surfaces.