Soundproofing Wall Resonance Control via Hollow Pressure Adjustment
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Solution Overview
Problem
Soundproofing walls with hollow portions between rigid members can lose soundproofing effect at specific resonance frequencies, especially when the resonance frequency matches the maximum sound frequency generated by a source, leading to insufficient sound reduction.
Innovation Solution
A soundproofing control system that includes a soundproofing wall with an inner and outer wall member and a hollow portion, equipped with a resonance state detecting unit and a pressure adjusting unit to minimize resonance by adjusting the pressure of the hollow portion, ensuring it remains between atmospheric pressure and the internal pressure of a steam condenser, or higher than atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hollow portion is provided between inner and outer wall members to improve soundproofing, then sound transmission loss increases at most frequencies, but resonance occurs at specific frequencies causing soundproofing effect to be lost
Solution Approach 1:
The patent changes the physical parameter of the hollow portion by adjusting the pressure of gas filled inside it. By varying the pressure, the density of the gas changes, which in turn changes the resonance frequency of the hollow portion. This allows the resonance frequency to be shifted away from the maximum sound frequency generated by the sound source, thereby maintaining soundproofing effectiveness across the critical frequency range.
2Device complexity
If the soundproofing wall structure is simplified without hollow portions, then device complexity decreases, but sound transmission loss decreases at resonance frequencies
Solution Approach 1:
The patent introduces gas as an intermediary substance filled in the hollow portion between the inner and outer wall members. This gas acts as a mediator that affects the acoustic properties of the hollow portion, specifically its resonance frequency. By selecting and pressurizing appropriate gas, the system achieves improved sound transmission loss without complicating the basic wall structure.
3Reliability
If gas pressure in the hollow portion is increased to shift resonance frequency, then soundproofing performance improves, but energy consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-filling the hollow portion with gas at the appropriate pressure during the manufacturing or installation phase. Once the desired pressure is achieved, the system maintains this state without requiring continuous energy input. The gas pressure is set in advance to position the resonance frequency away from the sound source's maximum frequency, ensuring optimal soundproofing performance throughout operation.
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 system improves soundproofing performance by shifting the resonance frequency, increasing transmission loss at the original resonance frequency, thereby effectively reducing sound volume at that frequency.
Implementation Method 1
an outer wall member may resonate according to the vibration of an inner wall member
Implementation Method 2
adjusting the pressure of the hollow portion so that the resonance state is a minimum
Data Source
AI summary
To improve soundproofing performance of a soundproofing wall constituted by wall members overlapping with a hollow portion therebetween.A resonance state of an outer wall member of a soundproofing wall which includes an inner wall member on the side of a sound generation source, an outer wall member outwards from the inner wall member with respect to a position of the generation source, and a hollow portion which is provided between the inner wall member and the outer wall member is detected. A pressure of the hollow portion is adjusted so that the resonance state is a minimum based on adjustment of the pressure of the hollow portion.