Filter Housing Quarter Wave Resonator Acoustic Silencing
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Solution Overview
Problem
Internal combustion engine manufacturers require effective sound attenuation, particularly in turbo/supercharged engines, which is typically achieved with separate sound attenuating devices, but a more cost-effective solution is needed.
Innovation Solution
Integration of quarter wave resonator blind holes in the internal dividing wall of filter assemblies for acoustic attenuation, which can be designed to target specific noise frequencies by varying the depth and density of the blind holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate sound attenuating device is incorporated in the system, then sound attenuation is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the sound attenuation function with the air cleaner filter assembly by integrating quarter wave resonator blind holes directly into the housing walls. This merging of functions eliminates the need for a separate sound attenuating device, thereby reducing device complexity and cost while maintaining effective sound attenuation performance
2Object-affected harmful factors
If a separate sound attenuating device is incorporated in the system, then sound attenuation is improved, but manufacturing cost increases
Solution Approach 1:
The sound attenuation function is merged into the existing filter assembly housing structure. The quarter wave resonator blind holes are formed directly during housing manufacturing, eliminating the need for separate sound attenuating devices and reducing overall manufacturing cost while maintaining effective sound attenuation
Solution Approach 2:
The patent uses quarter wave resonator blind holes with specific depth and diameter parameters to achieve sound attenuation at target frequencies. By adjusting these geometric parameters during the housing design and manufacturing process, effective sound attenuation is achieved without requiring additional expensive components
3Object-affected harmful factors
If the filter assembly is designed to target specific noise frequencies, then sound attenuation effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent achieves frequency-specific sound attenuation by controlling the depth and diameter parameters of the quarter wave resonator blind holes. These geometric parameters directly determine the resonant frequency according to acoustic principles, allowing targeted noise frequency attenuation through standard manufacturing tolerances without requiring excessive precision
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
This approach provides effective sound attenuation within the filter assembly, reducing the need for separate sound attenuating devices and enhancing the overall cost-effectiveness of the system while maintaining performance.
Implementation Method 1
quarter wave resonator blind holes formed in the internal dividing wall for acoustic attenuation
Implementation Method 2
quarter wave resonator blind holes formed in the internal dividing wall for acoustic attenuation
Data Source
AI summary
A filter includes a housing with multiple flow passages and filter elements, including at least first and second flow passages therethrough including respective first and second filter elements in parallel. Respective internal dividing walls separate flow passages and are provided with acoustic attenuators.