Flow-Guiding Net With Variable Mesh Density For Intake Noise Reduction
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Solution Overview
Problem
Existing intake noise reduction methods in intake pipes, such as flow-guiding nets and partition walls, either create significant resistance or fail to adequately suppress the merging of air flows, leading to noise and efficiency degradation.
Innovation Solution
A flow-guiding net with a mesh configuration that is fine near the center of the intake pipe and becomes coarser with distance from the center, combined with an elastic gasket portion, is used to guide air flows and reduce noise while minimizing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a partition wall is provided to prevent merging of air flows, then noise is suppressed, but air flow resistance increases significantly
Solution Approach 1:
The flow-guiding net divides the air flow into multiple paths through its mesh structure, guiding upper and lower air flows to merge gradually rather than abruptly, reducing turbulence and noise while maintaining lower resistance compared to a solid partition wall
Solution Approach 2:
The mesh density of the flow-guiding net varies locally, with finer mesh in certain regions and coarser mesh in others, allowing optimized flow guidance in different areas to balance noise reduction with air flow efficiency
2Loss of energy
If a flow-guiding net is provided to guide air flow, then air flow resistance is reduced, but noise suppression effectiveness is insufficient
Solution Approach 1:
The mesh density varies locally across the flow-guiding net, with finer mesh in regions requiring stronger flow guidance and coarser mesh where resistance reduction is prioritized, optimizing both noise suppression and flow efficiency
Solution Approach 2:
The flow-guiding net is configured to be deformable, allowing it to adapt dynamically to varying air flow conditions and throttle valve positions, maintaining effective noise reduction across different operating states
3Object-affected harmful factors
If the mesh is made fine throughout to guide air flow effectively, then noise is suppressed, but air flow resistance increases
Solution Approach 1:
The mesh density is optimized locally rather than uniformly, with finer mesh only in regions where flow guidance is most needed for noise reduction, and coarser mesh in other regions to minimize overall air flow resistance
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 solution effectively suppresses noise and reduces air flow resistance by guiding air flows away from the center, maintaining durability and sealing functionality, outperforming conventional methods.
Implementation Method 1
a flow-guiding net that guides an air flow, wherein the flow-guiding net includes a mesh that is configured to be fine in a vicinity of a center of a flow passage in the intake pipe and to become coarser with distance from the vicinity of the center
Data Source
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AI summary
Provided is an intake noise reduction device that can suppress an occurrence of noise in an intake pipe. An intake noise reduction device (100) disposed on a downstream side of a throttle valve in an intake pipe and including a flow-guiding net (110) that guides an air flow, wherein the flow-guiding net includes a mesh that is configured to be fine in a vicinity of a center of a flow passage in the intake pipe and to become coarser with distance from the vicinity of the center. For example, the mesh flow-guiding net (110) is formed of a plurality of radial portions (111) extending radially outward from the vicinity of the center of the flow passage in the intake pipe and a plurality of concentric portions (112) provided concentrically from the vicinity of the center.