Acoustic shutter assembly
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Solution Overview
Problem
Existing acoustic shutter assemblies fail to effectively reduce low-frequency noise while maintaining ventilation capabilities, especially in areas with heavy traffic.
Innovation Solution
The acoustic shutter assembly incorporates acoustic reflectors between sound-absorbing material layers to create multiple ventilation channels that disrupt the linear path of sound waves, combined with perforated plates for sound absorption and stability, and varying thicknesses of sound-absorbing materials for enhanced noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a simple labyrinth ventilation duct is used, then ventilation is maintained, but low-frequency noise reduction is insufficient
Solution Approach 1:
The ventilation duct is segmented into multiple parallel channels by acoustic reflectors, creating a complex multi-path ventilation system that maintains airflow while disrupting sound wave propagation, particularly effective against low-frequency noise
Solution Approach 2:
Acoustic reflectors are positioned at different heights (vertical dimension) within the ventilation duct, creating reflective surfaces that redirect sound waves in multiple directions and prevent direct linear sound paths from the outer to inner openings
2Object-affected harmful factors
If thicker sound absorbing material is used, then sound insulation is improved, but the total thickness of the assembly increases
Solution Approach 1:
The sound absorbing material is divided into two separate layers positioned at different locations (inner and outer frame), with each layer optimized for specific thickness to achieve effective noise reduction across different frequency ranges while controlling overall assembly thickness
Solution Approach 2:
Different thicknesses of sound absorbing material are applied at different locations: the outer layer has greater thickness for absorbing low-frequency noise entering from outside, while the inner layer has smaller thickness, optimizing noise reduction performance while controlling total material usage and assembly thickness
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 significantly reduces noise entry without compromising ventilation, providing improved soundproofing and stability against noise and moisture.
Implementation Method 1
a first layer of sound absorbing material arranged at the inside of the frame and an outer ventilation opening and an inner ventilation opening
Implementation Method 2
a number of acoustic reflectors in the form of plate material are arranged between the first and second layers of sound absorbing material so that the ventilation duct is separated into a number of respective ventilation channels
Data Source
Figure 1~3
Figure 4~7
Figure 8~9
AI summary
The acoustic shutter assembly (1) includes at least one window pane (2, 3) arranged in a frame (4). At least one ventilation duct (7) is arranged in the frame between an outer ventilation opening (8) and an inner ventilation opening (9), extending between a first layer of sound absorbing material arranged at an inside (5) and a second layer of sound absorbing material arranged at an outside. A number of acoustic reflectors (12) in the form of plate material are arranged between the first and second layers of sound absorbing material so that the ventilation duct is separated into a number of respective ventilation channels (13) formed between the acoustic reflectors. Each ventilation channel changes direction at least once between the outer ventilation opening and the inner ventilation opening, thereby at least substantially blocking any linear path from the outer ventilation opening to the inner ventilation opening.