Membrane Partition Structure for Lightweight High-Frequency Noise Insulation
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Solution Overview
Problem
Existing soundproof structures face challenges in achieving effective sound insulation with a lightweight configuration, particularly in reducing noise from specific frequencies, and tend to have lower sound insulation properties compared to simple plate members, especially when the resonance frequency is mismatched with the noise frequency.
Innovation Solution
A partition member with a soundproof structure that includes a membrane-like member fixed to a support body, a rear surface plate, and a rear surface space, where the relative maximum resonance frequency is set lower than the sound insulation target frequency, and the soundproof structure is designed to absorb sounds at higher frequencies, with a frequency ratio of 1.05 to 1.50, using multiple membrane type resonators with varying dimensions and a porous sound absorbing body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a resonance structure is used to absorb sound at specific frequencies, then sound absorption performance is improved, but sound insulation performance deteriorates
Solution Approach 1:
The partition member is divided into multiple independent resonance structures (first, second, and third resonance structures) with different resonance frequencies. Each structure targets specific frequency ranges, allowing the system to absorb sounds across a broader spectrum while maintaining sound insulation through the combined effect of segmented resonators rather than a single resonant system
Solution Approach 2:
The partition member combines multiple resonance structures with different structural characteristics (membrane-type, plate-type, and shell-type resonators) into a composite system. This composite approach allows simultaneous optimization of sound absorption at specific frequencies and overall sound insulation performance by leveraging the complementary characteristics of different resonator types
2Reliability
If a simple plate member is used, then sound insulation properties are maintained, but sound absorption at specific frequencies is reduced
Solution Approach 1:
The invention incorporates resonance structures that utilize mechanical vibration of membrane-like members, plates, and shells to absorb specific frequency sounds. These vibrational elements are integrated into the partition member, enabling it to selectively vibrate and absorb unwanted frequencies while the overall plate structure maintains general sound insulation properties
Solution Approach 2:
The partition member employs resonance structures with adjustable parameters such as membrane tension, plate thickness, and cavity volume to tune resonance frequencies. By changing these parameters, the system can target specific noise frequencies for absorption while maintaining the base plate's sound insulation characteristics across other frequencies
3Object-affected harmful factors
If the resonance frequency is matched to noise frequency, then sound absorption is improved, but sound insulation properties become lower than simple plate members
Solution Approach 1:
The partition member is divided into multiple independent resonance structures (first, second, and third resonance structures) with different resonance frequencies. Each structure targets specific frequency ranges, allowing the system to absorb sounds across a broader spectrum while maintaining sound insulation through the combined effect of segmented resonators rather than a single resonant system
Solution Approach 2:
The partition member combines multiple resonance structures with different structural characteristics (membrane-type, plate-type, and shell-type resonators) into a composite system. This composite approach allows simultaneous optimization of sound absorption at specific frequencies and overall sound insulation performance by leveraging the complementary characteristics of different resonator types
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 efficiently insulates noise with a lightweight configuration, achieving superior sound insulation performance, especially at higher frequencies, while maintaining effective sound absorption, thus reducing the harshness of specific frequency noises.
Implementation Method 1
the soundproof structure absorbs a sound by a resonance structure formed by a rear surface space surrounded by the rear surface plate, the membrane-like member, and the support body
Implementation Method 2
multiple membrane type resonators with varying dimensions and a porous sound absorbing body
Data Source
AI summary
Provided are a partition member including a soundproof structure capable of efficiently insulating noise with a lightweight configuration, and an electronic device and a vehicle using the partition member.In the partition member including the soundproof structure, the soundproof structure includes a support body having an opening, and a membrane-like member that is fixed to an opening surface of the support body in which the opening is formed and that vibrates as noise is incident, and a rear surface plate fixed to the support body on a side opposite to the membrane-like member, and the soundproof structure absorbs a sound by a resonance structure formed by a rear surface space surrounded by the rear surface plate, the membrane-like member, and the support body and the membrane-like member, and insulates a sound having a frequency higher than a relative maximum resonance frequency at which a sound absorption coefficient becomes a relative maximum among resonance frequencies of the resonance structure. The relative maximum resonance frequency is set to be lower than a sound insulation target frequency set for noise. Furthermore, in a case where the sound insulation target frequency is indicated as fn and the relative maximum resonance frequency is indicated as fr, fn/fr is 1.05 to 1.50.