Deflectable Fastening Device for Rail Vehicle Cladding
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Solution Overview
Problem
Rail vehicle cladding systems face issues with explosion pressure absorption, leading to potential damage and loss of trim parts, which can violate the vehicle's loading gauge and pose safety risks due to inadequate energy dissipation and secure fastening solutions.
Innovation Solution
A deflectable fastening device with an energy store that absorbs kinetic energy from explosions, allowing elastic deformation without permanent damage, and ensures the cladding element remains connected, enabling pressure relief and maintaining the vehicle's structural integrity by allowing the cladding element to return to its original position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible deformable panels are used to absorb explosion pressure, then the energy is dissipated without fastening devices tearing off, but the deformed trim parts violate the vehicle's loading gauge and may collide with infrastructure
Solution Approach 1:
The fastening device incorporates a deflectable connection element that can dynamically change its state between rigid (during normal operation) and flexible (during explosion). This dynamic characteristic allows the fastening device to maintain structural integrity during explosions while preventing permanent deformation that would violate loading gauge requirements.
Solution Approach 2:
The deflectable connection element is designed in advance to absorb and dissipate explosion energy through controlled elastic deformation. By providing this cushioning mechanism beforehand, the system prevents both fastening device failure and permanent panel deformation, resolving the contradiction between reliability and shape maintenance.
2Ease of manufacture
If slots are provided in the panel to simplify deformation, then the panel can deform more easily during explosions, but the paneling may tear open and detach from the vehicle
Solution Approach 1:
Instead of providing permanent slots that compromise panel integrity, the invention uses a deflectable connection element that provides temporary flexibility only when needed. The connection element remains rigid during normal operation maintaining panel integrity, but deflects during explosions to allow energy dissipation without permanent damage.
3Reliability
If catch hooks and shackles are used to secure damaged cladding, then the cladding parts are prevented from loss, but their low load-bearing capacity limits them to relatively light cladding only
Solution Approach 1:
The deflectable connection element maintains full load-bearing capacity during normal operation, unlike catch hooks and shackles that are designed for light-duty applications. The dynamic nature of the connection element allows it to withstand both the forces of heavy cladding during operation and the explosive forces during accidents, providing both strength and retention reliability.
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 effectively absorbs explosion pressure, preventing damage to the cladding and maintaining the vehicle's loading gauge, ensuring safety and structural integrity by allowing the cladding element to return to its original position post-explosion, thus avoiding collisions and ensuring secure fastening.
Implementation Method 1
The paneling element is preferably deflected purely elastically, i.e. without any plastic deformation, so that the effects of an explosion on the paneling of the vehicle are completely reversible. The kinetic energy introduced by an explosion, which can hit a paneling from the inside of a receiving space, can be at least partially consumed by the elastic deflection or deformation of the fastening device.
Implementation Method 2
the energy store acts with stored energy in a closing direction on the cladding element. Thus, the cladding element can also be returned towards its original closed position by the elastically deflected fastening device.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a cladding device (18) for a rail vehicle, in particular for the outer cladding of a rail vehicle, comprising a cladding element (8) and at least one fastening device (10) for attaching the cladding element (8) to the rail vehicle. In order to provide an improved solution against the loss of cladding parts in the event of an explosion in a receiving compartment (1) and to avoid the risk of violating the vehicle's clearance profile, the fastening device (10) is designed to be deflectable in an opening direction (21) when a predetermined pressure load is applied to the cladding element (8).