Air Intake Duct Drain Hole Geometry for Airflow Noise Suppression
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Solution Overview
Problem
Existing methods to suppress airflow noise generated by drain holes in intake ducts require significant modifications to the intake duct path and resonator shape, and there is a need for a more straightforward solution.
Innovation Solution
The resonator's drain hole is designed as a penetrating channel with an extended length by adding a thick portion around it, which effectively suppresses airflow noise without altering the intake duct path or resonator shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drain holes are provided in the resonator to prevent water accumulation, then water drainage function is improved, but airflow noise is generated at certain air flow speeds
Solution Approach 1:
The patent changes the geometric parameters of the drain hole by extending its length in the thickness direction of the resonator wall. This parameter modification transforms the flow characteristics through the drain hole, suppressing airflow noise while maintaining the water drainage function. The extended length creates a longer flow path that reduces turbulence and noise generation.
2Object-generated harmful factors
If tuning holes, protrusions, or straightening plates are added to suppress airflow noise, then airflow noise is reduced, but significant modifications to the intake duct path and resonator shape are required
Solution Approach 1:
The patent applies local quality modification by extending the drain hole specifically in the thickness direction at the location where airflow noise occurs. This localized modification targets the noise source without requiring changes to the overall intake duct path or resonator shape. The extension is provided only where necessary to suppress noise, maintaining simplicity of the overall structure.
3Object-generated harmful factors
If the drain hole length is extended by adding a thick portion, then airflow noise is suppressed, but the resonator structure becomes more complex
Solution Approach 1:
The patent merges the noise suppression function with the existing resonator structure by integrating the extended drain hole directly into the resonator wall. The thick portion extending the drain hole is formed as part of the resonator structure itself, combining the drainage function and noise suppression function in a single integrated component without adding separate noise control elements.
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 design significantly reduces airflow noise by extending the drain hole's length, providing effective noise suppression without major modifications, as demonstrated by sound pressure level reductions across various frequencies.
Implementation Method 1
the length of the penetrating channel is extended by providing a thick portion at least on the periphery of the drain hole... significantly reduces airflow noise by extending the drain hole's length
Data Source
AI summary
An air intake duct for a motor vehicle includes a resonator having an outer wall that defines an internal space. At least one drain hole is configured as a penetrating channel through a bottom surface of the outer wall. A thick portion is disposed at least around the periphery of the drain hole to increase the length of the penetrating channel.