Window Acoustic Damping Device for Ventilation Noise Control
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Solution Overview
Problem
Multi-pane windows provide effective soundproofing when closed but fail to adequately dampen noise when slightly ajar, particularly in noisy environments, limiting ventilation options for residents in noisy areas.
Innovation Solution
A window system incorporating passive and active acoustic damping systems, featuring acoustically absorbent slides and an electronic control module with microphones and loudspeakers, which creates an acoustic counterwave to attenuate noise across various frequency ranges, even when the window is partly open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the window is opened for ventilation, then air circulation is improved, but noise from outside significantly increases
Solution Approach 1:
The patent introduces an acoustic silencer as an intermediary device between the indoor and outdoor environments. This silencer comprises acoustic dampening material that mediates the transmission of sound waves while allowing air to pass through, thus enabling ventilation while reducing noise transmission from outside to inside
Solution Approach 2:
The acoustic silencer is nested within the window structure itself, with the dampening material integrated into the window frame or panel. This nested configuration allows the noise-reducing function to be embedded within the existing window system, maintaining ventilation capability while attenuating sound transmission
2Object-affected harmful factors
If multi-pane windows are used, then soundproofing is improved, but ventilation capability is reduced when the window must remain closed
Solution Approach 1:
The acoustic silencer acts as a mediator that allows the window to remain closed while still providing ventilation. The dampening material within the silencer permits air passage while blocking sound transmission, enabling both noise protection and air circulation without requiring the window to be opened
Solution Approach 2:
The window system is enhanced with multi-functionality by integrating the acoustic silencer that simultaneously provides noise attenuation and ventilation capabilities. This universal solution allows the window to perform both soundproofing and air circulation functions without compromising either performance
3Productivity
If the window is opened slightly ajar, then ventilation is enabled, but the soundproofing effect is significantly impaired
Solution Approach 1:
The acoustic silencer serves as an intermediary structure that maintains noise barrier integrity even when the window is opened. The silencer extends into the opening and its dampening material continues to attenuate sound waves passing through the gap, while still allowing adequate air flow for ventilation
Solution Approach 2:
The acoustic silencer provides localized noise reduction precisely at the window opening area where sound transmission occurs. The dampening material is strategically positioned in the gap region to target and attenuate sound waves locally, while maintaining overall ventilation flow through the window system
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 system effectively reduces outside noise by up to 35 dB when windows are partly ajar, allowing for ventilation while minimizing disturbance from external sounds, and achieves improved noise attenuation across a wide frequency range.
Implementation Method 1
a passive acoustic silencer comprising two acoustically absorbent parallel slides, extending in a median plane normal to the open surface
Implementation Method 2
an electronic control module comprising means of analyzing the signal picked up by the microphone and generating a signal emitted by the loudspeaker constituting an acoustic counterwave to the signal picked up by the microphone
Data Source
AI summary
A sliding window to close off an open surface in a wall separating the inside from the outside. The window includes an opening panel, a frame and a passive acoustic silencer. The silencer includes two parallel and acoustically absorbent slides extending in a median plane normal to the open surface. One slide is attached to the opening panel and the other slide is attached to the frame. The movement of the opening panel relative to the frame creating, between the slides, a slit having a thickness equal to the window opening. Also, a system of windows to acoustically damp between the inside and outside of an open space in a wall.