Perforated Panel Sound Absorber for Tire Cavity Resonance
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Solution Overview
Problem
Existing solutions fail to effectively reduce noise emissions from tires, particularly the first acoustical cavity resonance mode, which contributes to annoying interior noise in vehicles.
Innovation Solution
A pneumatic tire with a sound absorbing device component comprising a panel and two sidewall sections connected to the inner surface, where ≥95% of perforations on the panel allow access to an enclosed inner volume, reducing noise by dissipating sound energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise-absorbing foam is added to the internal cavity of the tyre, then noise emission is reduced in a large frequency range, but the first acoustical cavity resonance mode is not specifically addressed
Solution Approach 1:
The invention applies a localized sound-absorbing structure (perforated panel with absorptive material) specifically positioned to address the first acoustical cavity resonance mode, rather than using uniform foam throughout the entire cavity. This localized approach targets the specific frequency problem while maintaining effectiveness.
Solution Approach 2:
The invention uses porous absorptive material behind a perforated panel to create a resonant absorber that specifically targets the first acoustical cavity resonance mode. The porous structure dissipates acoustic energy through friction and viscous effects, effectively reducing noise at the problematic frequency.
2Object-affected harmful factors
If a sound absorbing device with perforated panel and enclosed volume is implemented, then the first acoustical cavity resonance mode is effectively reduced, but device complexity increases
Solution Approach 1:
The sound absorbing device is nested within the existing tyre cavity structure, utilizing the available space efficiently. The perforated panel and absorptive material are integrated into the tyre's internal geometry without requiring complete reconstruction of the cavity, thus reducing overall complexity.
Solution Approach 2:
The sound absorbing device is segmented into distinct functional components (perforated panel, absorptive material, mounting structure) that can be manufactured separately and assembled. This modular approach simplifies manufacturing and installation while achieving the desired acoustic 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 sound absorbing device significantly reduces noise emissions by addressing the first acoustical cavity resonance mode, enhancing passenger comfort by minimizing annoying interior noise.
Implementation Method 1
a sound absorbing device component comprising a panel with a plurality of perforations and two sidewall sections, the sidewall sections being distinct from the panel
Implementation Method 2
reducing noise by dissipating sound energy... significantly reduces noise emissions by addressing the first acoustical cavity resonance mode
Data Source
AI summary
A pneumatic tyre comprising an inner surface of the tyre, wherein a sound absorbing device component is connected to the inner surface of the tyre. The sound absorbing device component comprises a panel with a plurality of perforations and two sidewall sections, the sidewall sections being distinct from the panel, wherein the sidewall sections are connected to the inner surface of the tyre and arranged opposite of each other and wherein the panel is borne by the sidewall sections, thereby positioning the panel at a distance from the inner surface of the tyre and defining an inner volume enclosed by the panel, the sidewall sections and the inner surface. Furthermore, ≥95 area-% of all perforations which permit access to the inner volume are located on the panel.