Rail Vehicle Door Leaf Frame Thermal Decoupling
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Solution Overview
Problem
Current door leaf frame structures for rail vehicles, typically made of metal, face challenges in thermal and acoustic insulation due to their high thermal conductivity, which leads to heat and noise transmission issues, especially in cold environments.
Innovation Solution
The door leaf frame is designed with a thermally and acoustically decoupled structure using materials with lower thermal conductivity than metal, such as plastics or composite materials, and an insulating layer between the shells, along with profiles that have webs to separate the thermal and acoustic paths, reducing heat flow and noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal frame structure is used for the door leaf, then the structural strength and rigidity are ensured, but the thermal insulation performance deteriorates due to high thermal conductivity
Solution Approach 1:
The door leaf frame is constructed as a composite structure combining metal profiles (for strength) with thermal insulation material (for thermal insulation). The insulation material is integrated into the frame structure itself, creating a hybrid material system that simultaneously provides mechanical strength and thermal protection.
Solution Approach 2:
The frame profile is divided into multiple functional segments: metal profile parts (for structural strength) and insulation material parts (for thermal insulation). This segmentation allows each material to perform its optimal function while being integrated into a unified frame structure.
2Stability of the object's composition
If a metal frame structure is used for the door leaf, then the structural rigidity is ensured, but the acoustic insulation performance deteriorates due to noise transmission
Solution Approach 1:
The composite frame structure combines metal (for rigidity) with insulation material (for acoustic damping). The insulation material acts as an acoustic barrier within the frame, reducing noise transmission while the metal profile maintains structural rigidity.
Solution Approach 2:
The thermal insulation material serves as an intermediary element within the frame structure that specifically addresses acoustic noise transmission. This intermediate layer dampens sound waves and prevents direct noise transmission through the metal frame.
3Loss of energy
If thermal insulation material is integrated into the frame structure, then the thermal insulation performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The frame structure and thermal insulation are merged into a single integrated component rather than separate assemblies. The insulation material is built into the frame profile itself, eliminating the need for separate insulation installation steps and reducing overall manufacturing complexity.
Solution Approach 2:
The composite frame structure is designed as a unified manufacturing unit where metal and insulation materials are combined in a single production process or pre-assembled configuration, simplifying the overall manufacturing workflow despite the multi-material composition.
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 approach provides enhanced thermal insulation, reduces energy costs, and effectively isolates driving noises from the passenger compartment while being cost-effective and easy to manufacture.
Implementation Method 1
a door leaf having a door leaf frame, a first shell arranged on a first main surface of the door leaf frame and a second shell arranged on a second main surface opposite the first main surface, the door leaf being designed in this way that a heat flow path from the first shell to the second shell takes place through at least two different materials, the at least two different materials having thermal conductivity that differs from one another, a first material of the at least two different materials having a poorer thermal conductivity than a metal
Implementation Method 2
The web can acoustically and/or thermally decouple the first profile part from the second profile part
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
The present invention relates to a door leaf (200) for a vehicle, in particular a rail vehicle, wherein the door leaf (200) comprises a door leaf frame (100), a first skin (270) mounted on a first main surface (277) of the door leaf frame (100) and a second skin (275) mounted on a second main surface (278) opposite the first main surface (270). The door leaf (200) is designed in such a manner that there is a heat path (280) from the first skin (270) to the second skin (275) through at least two different materials, wherein the at least two different materials have a different thermal conductivity, wherein a first material of the at least two different materials has a poorer thermal conductivity than metal, in particular a poorer thermal conductivity than aluminium.