Pneumatic Tire Foamed Layer Acoustic Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pneumatic vehicle tires do not adequately address the issue of rolling noise reduction, despite the use of foamed materials, as there is a need for further improvement in acoustic absorption capabilities.
Innovation Solution
A pneumatic vehicle tire with a foamed material layer having a porosity of 80% to 99% is developed, where the foam is processed to have specific pore sizes and geometries, such as spherical or polygonal shapes, and cell wall structures, to enhance sound absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a foamed material layer is used to reduce rolling noise, then acoustic absorption is improved, but the noise reduction effect is insufficient
Solution Approach 1:
The patent applies porous materials by using a foamed material layer with specifically controlled porosity (80-95%) and pore size (0.3-0.7mm) to enhance acoustic absorption. The porous structure allows sound waves to penetrate and dissipate energy through friction and viscous effects within the pores, significantly improving rolling noise reduction compared to conventional solid or low-porosity foam materials.
Solution Approach 2:
The patent implements parameter changes by optimizing key parameters of the foamed material including porosity (80-95%), pore size (0.3-0.7mm), and thickness (5-15mm). These parameter adjustments transform the acoustic absorption performance of the material, enabling it to effectively attenuate rolling noise while maintaining structural integrity and adhesion to the tire inner surface.
2Ease of manufacture
If the foamed material structure is simplified, then manufacturing is easier, but sound absorption performance deteriorates
Solution Approach 1:
The patent achieves the balance between manufacturing ease and sound absorption by defining specific parameter ranges for the foamed material. The porosity (80-95%) and pore size (0.3-0.7mm) are controlled within optimized ranges that can be achieved through standard foam manufacturing processes, avoiding overly complex structures while ensuring adequate acoustic absorption performance.
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 high porosity and tailored pore geometry significantly improve sound absorption, reducing rolling noise by reflecting and breaking up body-borne sound, resulting in enhanced acoustic performance.
Implementation Method 1
The high porosity and tailored pore geometry significantly improve sound absorption, reducing rolling noise by reflecting and breaking up body-borne sound
Implementation Method 2
reducing rolling noise by reflecting and breaking up body-borne sound
Data Source
AI summary
A pneumatic vehicle tire has a structured tread which transitions at both sides into sidewalls the end of which is formed by a tire bead which is insertable in air-tight fashion into a wheel rim of a vehicle wheel equipped with the pneumatic vehicle tire, such that an air cavity filled with compressed air is formed between wheel rim and pneumatic vehicle tire. The pneumatic vehicle tire has, on its inner surface situated opposite the tread, a foamed material layer. The porosity of the foamed material layer amounts to between 70% and 99% of the total volume of the foamed material layer.