Wheel Waveguide Structure for Vehicle Resonance Noise Reduction
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Solution Overview
Problem
Existing technologies for reducing resonance noise in vehicle wheels face challenges such as high variability in attenuation target frequencies due to resonator deformation, limited mass productivity, and insufficient noise reduction when using waveguides, which can only be mounted in limited numbers on the wheel rim.
Innovation Solution
A wheel design incorporating waveguides with a 'U'-shaped internal passage that reflects sound waves to generate inverse phase waves, allowing for increased mounting of waveguides on the rim without degrading mass productivity, and dualizing waveguide lengths to target specific resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a resonator is mounted on the rim of the wheel to reduce resonance noise, then the resonance noise reduction effect is improved, but the mass productivity is significantly degraded due to high variation probability of attenuation target frequency even due to small deformation
Solution Approach 1:
The patent replaces the resonator with a waveguide that has a standardized, deformation-resistant structure. The waveguide copies the noise reduction function of the resonator but uses a geometric design (U-shaped passage with specific dimensions) that is less sensitive to manufacturing variations and deformation, thereby maintaining mass productivity while achieving comparable noise reduction effects
Solution Approach 2:
The patent changes the structural parameters of the noise reduction device from a resonator with sensitive frequency characteristics to a waveguide with geometric parameters (passage width, passage length, curvature radius) that can be precisely controlled during mass production. The waveguide parameters are designed to create inverse phase sound waves through reflection rather than resonance, making the system less sensitive to parameter variations
2Productivity
If a waveguide is mounted on the rim of the wheel to improve mass productivity, then the mass productivity is improved, but the resonance noise reduction effect is insufficient compared to mounting a resonator
Solution Approach 1:
The patent enhances the waveguide design by adding a U-shaped configuration with both a longitudinal passage and a lateral passage, creating a three-dimensional sound wave reflection path. This dimensional enhancement allows the waveguide to effectively reduce resonance noise by reflecting sound waves from multiple directions, achieving noise reduction performance comparable to resonators while maintaining mass productivity advantages
Solution Approach 2:
The waveguide acts as an intermediary structure that converts sound wave energy into inverse phase waves through controlled reflection. The U-shaped passage serves as a mediator between the noise source and the cavity, reflecting sound waves to create destructive interference that reduces resonance noise without requiring the sensitive resonant frequency tuning of traditional resonators
3Object-affected harmful factors
If the number of waveguides mounted on the rim is increased to improve resonance noise reduction performance, then the resonance noise reduction performance is improved, but the structure of the wheel limits the number of waveguides to three
Solution Approach 1:
The patent segments the waveguide into modular components (seating plate, waveguide main body, entrance, and wall portions) that can be independently manufactured and assembled. This segmentation allows for easier installation and positioning of multiple waveguides on the wheel rim, overcoming structural limitations and enabling increased waveguide deployment for improved noise reduction 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 proposed wheel design achieves a resonance noise reduction effect comparable to or exceeding that of wheels with mounted resonators, while allowing for increased waveguide mounting and improved mass productivity, thus enhancing ride comfort and reducing noise pollution.
Implementation Method 1
configured to reflect the sound wave entering the internal passage to generate a sound wave having an inverse phase
Implementation Method 2
The cavity has an inherent resonance frequency according to its circumferential length... a sound wave is transmitted to the cavity and a resonant noise is caused due to a resonance frequency
Data Source
AI summary
A wheel for reducing a resonance noise in a vehicle may include a cylindrical-shaped rim on which a tire is mounted, and waveguides mounted on the rim, disposed in a cavity which is a space between the rim and the tire, having a ‘U’-shaped internal passage through which a sound wave generated in the cavity enters, and configured to reflect the sound wave entering the internal passage to generate a sound wave having an inverse phase, wherein a center portion of the internal passage extends in an axial direction of the rim, and first and second end portions of the internal passage are connected to a center portion of the internal passage to allow the sound wave to propagate and extend in a circumferential direction of the rim.