Wheel Assembly Noise Suppression Device Resonator Apertures
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Solution Overview
Problem
Vehicles experience road noise due to acoustic resonances within the wheel assembly's tire cavity, which are influenced by tire and rim sizes, vehicle suspension, and body structure, and existing solutions fail to effectively suppress noise across a wide frequency band.
Innovation Solution
A noise suppression device for the wheel assembly featuring a rim with a device wall that defines resonator chambers and includes a plurality of apertures with specific opening areas and densities, allowing for adjustable tuning to optimize sound absorption across varying tire sizes, temperatures, and vehicle speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing noise suppression solutions are used, then noise suppression is achieved at specific frequencies, but noise suppression across a wide frequency band is not effective
Solution Approach 1:
The patent changes the parameters of the resonator system by using multiple resonators with different volumes and different aperture configurations (area, shape, number). This allows the system to suppress acoustic resonances across a wide frequency band (160-240 Hz and beyond) rather than at a single frequency, resolving the contradiction between frequency band coverage and noise suppression effectiveness
Solution Approach 2:
The noise suppression device is segmented into multiple resonators, each targeting different frequency ranges. By dividing the single resonator into multiple segments with different characteristics, the system achieves broad frequency coverage while maintaining effective noise suppression at each frequency band
2Loss of energy
If the aperture size is increased, then sound absorption is improved, but the resonator chamber volume is reduced
Solution Approach 1:
The patent optimizes the aperture parameters (area, shape, number) to achieve the optimal balance between sound absorption and resonator chamber volume. By carefully selecting aperture area within specific ranges and configuring aperture shapes, the system maximizes sound absorption while maintaining sufficient chamber volume for effective resonance suppression
3Reliability
If the resonator chamber volume is changed, then noise suppression is optimized for specific tire sizes, but adaptability to various tire sizes is reduced
Solution Approach 1:
The patent uses multiple resonators with different volume configurations, allowing the system to be optimized for various tire sizes. Each resonator can be tuned to different frequencies, enabling the same device structure to adapt to different tire dimensions while maintaining effective noise suppression
Solution Approach 2:
The noise suppression device is designed with multi-functional resonators that can handle different frequency ranges and tire size configurations. By making the device universal through multiple resonators with adjustable parameters, it maintains noise suppression effectiveness across various tire sizes without requiring separate designs
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 noise suppression device effectively attenuates road noise over a wide frequency band, providing improved acoustic resonance suppression for different tire sizes and conditions, ensuring reduced noise levels across various scenarios.
Implementation Method 1
Vehicles are subject to road noise caused by acoustic resonances associated with a wheel assembly of the vehicle. Road noise resonates within a tire cavity of the wheel assembly
Implementation Method 2
The noise suppression device is operable to attenuate or suppress road noise that resonates within the tire cavity
Data Source
AI summary
A wheel assembly for a vehicle includes a rim having a noise suppression device. The rim includes an outer radial surface that is concentrically disposed about a central axis. A tire is mounted to the rim to define a tire cavity between the outer radial surface of the rim and an interior surface of the tire. The noise suppression device includes a device wall that defines at least one resonator chamber, and includes a plurality of apertures allowing fluid communication between the tire cavity and the resonator chamber, with each of the plurality of apertures defining an opening area between the range of 0.03 mm2 and 0.8 mm2.