Air Circulation Duct Splitter Structure for Resonance Noise Reduction
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Solution Overview
Problem
Existing noise reduction structures in air circulation ducts of railway vehicles suffer from reduced performance due to moisture absorption by sound-absorbing materials, leading to mold growth and maintenance challenges, and they do not effectively manage noise amplification and friction-induced noise within confined spaces.
Innovation Solution
A noise reduction structure for air circulation ducts featuring detachable components and splitters with adjustable angles and gaps, forming a resonance-type sound absorption system without sound-absorbing materials, utilizing hollow and porous designs to minimize noise and maintain airflow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound-absorbing material is applied on surfaces of splitters to reduce noise, then noise reduction effect is improved, but moisture absorption causes the material to harden and absorption performance is significantly reduced
Solution Approach 1:
The invention extracts and removes the sound-absorbing material from the splitter surface, replacing it with a sound-absorbing structure formed by the splitter geometry itself (protrusions and recesses). This eliminates the material that absorbs moisture while preserving the noise reduction function through structural design alone.
Solution Approach 2:
The invention replaces the material-based sound absorption mechanism with a geometry-based acoustic structure. The protrusions and recesses on the splitter create acoustic paths that reduce noise through reflection and diffusion, substituting the mechanical/chemical sound absorption material with a structural acoustic solution.
2Object-affected harmful factors
If sound-absorbing material is applied on splitters, then noise is reduced, but maintenance becomes difficult as the material cannot be replaced after duct installation
Solution Approach 1:
By removing the sound-absorbing material entirely and replacing it with a geometric sound-absorbing structure on the splitter, the invention eliminates the maintenance issue. The structural design requires no material replacement and can be easily cleaned, solving the maintenance difficulty while preserving noise reduction.
Solution Approach 2:
The invention uses a durable, reusable structural design instead of consumable sound-absorbing material. The splitter with its geometric features provides long-term noise reduction without degradation, eliminating the need for periodic material replacement and reducing maintenance costs.
3Productivity
If duct is formed as a closed structure to manage airflow, then airflow efficiency is improved, but noise is reflected and amplified along inner walls
Solution Approach 1:
The invention applies local sound-absorbing features (protrusions and recesses) specifically on the splitter surface where noise reflection occurs, rather than lining the entire duct. This localized treatment reduces noise at the critical reflection point while preserving the overall closed duct structure and its airflow efficiency.
Solution Approach 2:
The geometric features on the splitter create acoustic paths that manipulate sound wave propagation through reflection and diffusion. The protrusions and recesses cause sound waves to follow complex paths, reducing the intensity of reflected noise while maintaining the duct's closed structure for airflow management.
4Object-affected harmful factors
If splitters are disposed in central portion and side surfaces spaced at predetermined distances, then noise reduction coverage is improved, but device complexity increases
Solution Approach 1:
The invention combines the sound-absorbing function and the flow-guiding function into a single splitter component. By integrating geometric sound-absorbing features directly on the splitter surface, the design eliminates the need for separate sound-absorbing materials and simplifies the overall structure while maintaining noise reduction effectiveness.
Solution Approach 2:
The splitter is designed to perform multiple functions simultaneously: guiding airflow, reducing noise through its geometric features, and eliminating the need for separate sound-absorbing materials. This multi-functional design reduces device complexity by consolidating functions into a single component.
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 structure effectively reduces noise by up to 100 dB across various frequency bands while maintaining airflow performance, prevents mold growth, and facilitates easy maintenance by allowing for component separation and cleaning.
Implementation Method 1
utilizing hollow and porous designs to minimize noise
Implementation Method 2
forming a resonance-type sound absorption system
Data Source
AI summary
The present invention relates to a noise reduction structure for an air circulation duct including an upper duct which forms an upper wall and both side walls of a duct and in which an opening is formed to face downward, a lower duct detachably mounted on the opening of the upper duct and forming a lower wall of a flow path, a plurality of central splitters mounted apart from each other in a longitudinal direction of the flow path in which air flows, a front splitter disposed in front of the central splitters, and a rear splitter disposed on an upper surface of the lower duct to be disposed behind the central splitters.