Transport Vehicle Door Leaf with Segmented Acoustic Core
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Solution Overview
Problem
Transport vehicle doors lack effective sound insulation, leading to discomfort for passengers due to inadequate acoustic performance, and existing solutions either compromise mechanical strength or increase mass and sensitivity to mechanical stress.
Innovation Solution
A door leaf design featuring a solid core with blind housings for acoustic blocks made of superior insulating materials, such as open cell foam or glass wool, which are strategically placed between the facings to enhance sound absorption without compromising structural integrity or increasing mass excessively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a complete acoustic shell is used to improve sound insulation, then the sound reduction index increases to 36 dB, but the mass of the leaf significantly increases and the structural thickness must be reduced
Solution Approach 1:
The acoustic shell is segmented into multiple discrete blocks distributed throughout the door leaf rather than using a single continuous shell. This segmentation allows the acoustic material to be placed strategically in key noise transmission paths while leaving space for structural components, thereby improving sound insulation without proportionally increasing overall mass.
Solution Approach 2:
Acoustic blocks are placed locally at specific positions within the door leaf where noise transmission is most critical, rather than uniformly distributing acoustic material throughout. This localized approach concentrates acoustic treatment where it is most effective while minimizing unnecessary mass addition in less critical areas.
2Object-affected harmful factors
If the thickness of the acoustic shell is increased to 20 millimeters to improve acoustic performance, then the sound reduction index reaches 36 dB, but the structural zone thickness must be reduced, compromising mechanical strength
Solution Approach 1:
The acoustic treatment is divided into multiple discrete blocks of varying sizes and positions rather than a single thick continuous shell. This allows structural zones to maintain adequate thickness for mechanical strength while acoustic blocks are positioned in spaces where they provide maximum acoustic benefit without compromising structural integrity.
Solution Approach 2:
Instead of providing uniform acoustic protection throughout the entire door leaf thickness, acoustic blocks are strategically positioned to provide sufficient acoustic protection in key areas. The number, size, and distribution of blocks are optimized to achieve the required sound reduction index without unnecessarily increasing overall thickness or compromising structural zones.
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 significantly improves sound reduction index while maintaining mechanical strength and reducing noise pollution, achieving a weighted attenuation index of 38 dB without excessive weight or vulnerability to mechanical stress.
Implementation Method 1
at least one paving stone, called acoustic insulating paving stone (51 - 56), said paving stone being formed of a second material, called acoustic insulating material, said second material having acoustic properties superior to those of said filling material
Data Source
Figure 1
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Figure 3~4
AI summary
Said leaf (1) comprises an inner cladding (10) and an outer cladding (20), a filling core (30, 51-56) made of solid material, a frame (70, 72, 74, 76) extending on the periphery of the core, and means for mounting on the door frame. According to the invention, the solid core comprises a filling body (30) made of a first material, referred to as a filling material, at least one tile, referred to as a sound-insulation tile (51-56), said tile being formed from a second material, referred to as a sound-insulation material, said second material having acoustic properties which are superior to those of said filling material, each sound-insulation tile extending only over part of the distance between the claddings (10, 20) on the side of the inner cladding (10). The leaf according to the invention makes it possible to significantly reduce the noise pollution to which the passengers of the transport vehicle are subjected, while maintaining satisfactory mechanical behaviour, in particular in terms of overall rigidity.