Silencing system
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Solution Overview
Problem
Existing silencing systems for tubular members, such as ventilation ports and air-conditioning ducts, face challenges in achieving both high ventilation performance and soundproofing due to limitations in size and design, particularly when dealing with low-frequency resonant sounds, and often require specific design for each tubular member, limiting general-purpose properties and effectiveness across multiple frequencies.
Innovation Solution
A silencing system is designed with silencers disposed in tubular members penetrating walls, featuring a standardized effective modulus of elasticity that does not resonate at the tubular member's first resonant frequency, incorporating a conversion mechanism like porous sound-absorbing materials to convert sound energy into thermal energy, and having a larger cross-sectional area and cavity volume than the tubular member, allowing for broader frequency silencing without interacting with the tubular member's resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound-absorbing materials are used to suppress low-frequency resonant sound, then soundproof performance is improved, but ventilation performance deteriorates due to increased material volume
Solution Approach 1:
The patent uses porous sound-absorbing materials with specific flow resistance characteristics to absorb low-frequency resonant sound while maintaining ventilation performance. The porous structure allows air to pass through while dissipating sound energy through viscous losses in the pores.
Solution Approach 2:
The patent changes the parameters of the sound-absorbing material, specifically the flow resistance, to optimize both soundproofing and ventilation. By controlling the flow resistance within a specific range, the material can effectively absorb low-frequency sound while allowing sufficient air flow for ventilation.
2Object-affected harmful factors
If resonance type silencer is used to silence specific frequency, then soundproof performance is improved, but device complexity increases and general-purpose properties deteriorate
Solution Approach 1:
The patent creates a silencing system that can handle multiple resonant frequencies simultaneously using a combination of sound-absorbing materials and multiple resonance type silencers with different tuning frequencies. This multi-functional approach allows a single system to address various frequency ranges without requiring separate customized solutions for each frequency.
Solution Approach 2:
The patent divides the silencing function into multiple components: sound-absorbing materials for broadband absorption and multiple resonance type silencers tuned to different frequencies. Each component targets specific frequency ranges, and their combined effect provides comprehensive soundproofing across multiple resonant frequencies.
3Object-affected harmful factors
If resonance type silencer is designed for specific tubular member, then soundproof performance is improved, but device complexity increases
Solution Approach 1:
The patent develops standardized silencing components that can be applied to various tubular members with different dimensions. The sound-absorbing materials and resonance type silencers are designed with adjustable parameters that can be tuned to match the resonant frequencies of different tubular members, reducing the need for completely custom designs.
Solution Approach 2:
The patent allows for parameter adjustment in the silencing system components to match different tubular member characteristics. By changing parameters such as the length, diameter, and tuning frequency of the resonance type silencers, the same basic design can be adapted to different applications without increasing overall system complexity.
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 configuration enables high ventilation performance while achieving effective soundproofing across multiple frequencies, reducing noise transmission, and eliminating the need for specific design based on the tubular member's dimensions, thus enhancing general-purpose properties and preventing new resonant sound generation.
Implementation Method 1
incorporating a conversion mechanism like porous sound-absorbing materials to convert sound energy into thermal energy
Data Source
AI summary
An object is to provide a silencing system that can achieve both high ventilation performance and high soundproof performance, can silence a plurality of pieces of resonant sound, and has high general-purpose properties since the silencing system does not need to be designed according to a tubular member. The silencing system includes one or more silencers that are disposed in a tubular member provided to penetrate a wall separating two spaces, and satisfies “0<Re[Bn]<1” and “Im[Bn]>0” in a case where a standardized effective modulus of elasticity in an interior space of the tubular member in which the silencers are disposed is denoted by Bn.