Device for damping of sounds and motor vehicle comprising such a device
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Solution Overview
Problem
Conventional labyrinthine passages in sound-damping casings for motor vehicles create strong backpressure, hindering air circulation and limiting noise reduction effectiveness.
Innovation Solution
A sound-damping panel with a throughflow space between two walls, featuring apertures in one wall and diffuser means on the opposing wall to deflect air flow, combined with sound-absorbing materials on internal surfaces, which reduces backpressure and enhances noise absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional labyrinthine passage is used to trap sounds at the casing outlet, then noise damping is improved, but backpressure increases which hinders air circulation
Solution Approach 1:
The sound-damping panel is divided into multiple functional elements: a first wall with apertures, a second wall, diffuser means, and sound-absorbing material. This segmentation allows each component to perform its specific function - the apertures allow air passage, the diffuser means distribute flow, and the sound-absorbing material traps noise - while collectively reducing backpressure compared to a conventional labyrinthine passage.
Solution Approach 2:
Different parts of the sound-damping panel have different properties optimized for their specific functions. The first wall has apertures for air intake, the second wall has diffuser means for flow distribution, and the internal surfaces have sound-absorbing material. This local differentiation allows the panel to achieve both noise damping and low backpressure simultaneously.
2Object-affected harmful factors
If a tight casing is used to maximize noise damping, then noise restraint is improved, but air flow for cooling is restricted
Solution Approach 1:
The sound-damping panel performs multiple functions simultaneously: it acts as a noise barrier, an air flow regulator, and a cooling system component. The apertures in the first wall allow air to pass through while the sound-absorbing material on internal surfaces traps noise, and the diffuser means ensure proper flow distribution. This multi-functionality eliminates the need to choose between noise damping and air flow.
3Quantity of substance
If a sound-damping panel with throughflow space is used instead of labyrinthine passage, then air circulation is improved, but noise entrapment capability may be reduced
Solution Approach 1:
The sound-absorbing material acts as an intermediary between the air flow and the noise. As air flows through the throughflow space between the first and second walls, the sound-absorbing material on the internal surfaces intercepts and absorbs acoustic energy, preventing noise from passing through while allowing air to circulate freely.
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 allows for improved air flow and effective noise damping by distributing air flow and absorbing acoustic energy, reducing noise leakage while maintaining efficient air circulation.
Implementation Method 1
Each diffuser means is arranged to deflect the air which flows via that aperture towards the second wall so that this air flow is then led in various different directions in said throughflow space
Implementation Method 2
the acoustic energy of the sound waves which make their way into the throughflow space via the apertures in the first wall is absorbed by the sound-absorbing material situated on one or more internal surfaces of the throughflow space
Implementation Method 3
the various air flows will impinge upon one another and thereby generate a turbulent air flow within the throughflow space, making it easier for the sound-absorbing material to absorb the acoustic energy of said sound waves
Data Source
Figure 1
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Figure 5~6
AI summary
Device for damping of sounds which comprises a casing (11 ) intended to be placed round one or more sou nd-generating equipment items, and a sound-damping panel (20) via which air is allowed to flow out from the casing. The sound-damping panel comprises a throughflow space (23) situated between a first wall (21 ) which faces towards the inside of the casing and a second wall (22) which extends along and at a distance from the first wall. The first wall is provided with a plurality of apertures (24) via which air is allowed to flow into the throughflow space. A diffuser means (25) is situated on the second wall directly opposite each aperture to deflect the air which via this aperture flows towards the second wall so that this air flow then proceeds in various different directions in the throughflow space. At least some of the internal surfaces of the throughflow space are covered with sound-absorbing material (29). Air is allowed to flow from the throughflow space and proceed to the surroundings via outlet apertures (31 ) of the sou nd-damping panel.