Multi-Directional Resonance Tubes for Low-Frequency Noise Attenuation
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Solution Overview
Problem
Existing noise reduction technologies, such as Helmholtz resonators, are inefficient in attenuating low-frequency sounds due to their large size and limited effectiveness, particularly in image forming apparatuses where space constraints are a concern.
Innovation Solution
A noise reducing structure utilizing multiple resonance tubes extending in different directions to resonate and absorb low-frequency sound waves, allowing for effective noise reduction without the need for large resonant spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Helmholtz resonators are used for noise reduction, then low-frequency sound attenuation is achieved, but the device size becomes large and space-consuming
Solution Approach 1:
The patent transitions from conventional Helmholtz resonator geometry to a linear resonance tube structure that extends in the longitudinal direction. This dimensional reorientation allows the resonance function to be achieved along the length of the exhaust pipe rather than requiring a large volumetric resonator cavity, thereby reducing overall device volume while maintaining low-frequency noise attenuation capability
Solution Approach 2:
The exhaust pipe itself is designed to serve dual functions: as the exhaust gas discharge pathway and as the resonance tube for noise reduction. By incorporating the resonance function into the existing exhaust pipe structure through internal partitioning, the patent eliminates the need for separate resonator components, achieving space-efficient multi-functionality
2Object-affected harmful factors
If conventional noise reduction structures are used, then noise attenuation is achieved, but the design becomes complex and space-consuming
Solution Approach 1:
The patent merges the noise reduction function with the exhaust pipe structure by forming resonance tubes using internal partitions within the exhaust pipe. This integration combines what would traditionally be separate components (exhaust system and noise reduction device) into a unified structure, simplifying the overall device complexity while maintaining effective noise leakage reduction
Solution Approach 2:
The exhaust pipe is segmented into multiple resonance tubes by internal partitions, with each partition creating a distinct resonance chamber. This segmentation approach allows the noise reduction function to be distributed across multiple smaller resonance paths rather than requiring a single complex resonator, simplifying the overall structure while enhancing noise attenuation effectiveness
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 multi-directional resonance tube configuration effectively reduces low-frequency noise leakage from image forming apparatuses, improving noise reduction efficiency within compact designs.
Implementation Method 1
a first resonance tube that extends in a first direction, that takes in from a sound absorbing opening portion a sound wave that is generated from a noise source, and that causes the sound wave to resonate to reduce leakage to outside
Data Source
AI summary
A noise reducing structure includes a first resonance tube that extends in a first direction, that takes in from a sound absorbing opening portion a sound wave that is generated from a noise source, and that causes the sound wave to resonate to reduce leakage to outside; and a second resonance tube that extends in a second direction differing from the first direction, and that, along with the first resonance tube, causes the sound wave that is generated from the noise source to resonate to reduce the leakage to the outside.