Rail Vehicle Table Bending Beam for Collision Force Absorption
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Solution Overview
Problem
Rail vehicle tables face challenges in withstanding operational demands and exceptional loads, particularly during collisions, which can lead to passenger injuries due to inadequate attachment systems that fail to absorb impact forces effectively.
Innovation Solution
A device featuring a bending beam with a weakening structure that allows controlled deformation and rotation of the table top relative to the side wall, absorbing forces through elastic or plastic deformation, thereby reducing the risk of injury and maintaining stability without compromising comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid table attachment system is used, then the table provides stable support during normal operation, but it transmits high impact forces to passengers during collisions causing injury risk
Solution Approach 1:
The bending beam is designed with predetermined weakening structures (notches, grooves, or reduced thickness sections) that create controlled deformation zones. These zones are prepared in advance to absorb impact energy through plastic deformation when collision forces occur, cushioning the blow before it reaches passengers.
Solution Approach 2:
The bending beam's cross-sectional geometry is varied along its length, with thickness or structural parameters changing to create zones of different stiffness. This allows the beam to be rigid in normal operation while becoming flexible under impact loads, changing its mechanical parameters based on load conditions.
2Object-affected harmful factors
If the table top is made rotatable to absorb impact, then passenger safety improves, but the table loses stability during normal use
Solution Approach 1:
The bending beam transitions from a static rigid connection to a dynamic system that can rotate or deform. The controlled weakening structures allow the beam to remain rigid under normal loads but rotate or bend when impact forces exceed a threshold, providing dynamic adaptability.
Solution Approach 2:
The bending beam is divided into functional segments: a rigid connection zone for stable attachment, and a controlled deformation zone with weakening structures that can rotate or bend. This segmentation allows different parts to serve different functions - stability during normal use and flexibility during impact.
3Reliability
If a heavily reinforced table attachment is used to withstand collisions, then passenger safety improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of reinforcing the entire bending beam, the weakening structures are extracted as localized features at specific critical points. This concentrates the safety function in discrete elements rather than requiring complex reinforcement throughout the entire structure.
Solution Approach 2:
The bending beam's controlled deformation zones are designed to deform plastically or be replaced after a collision event. Rather than designing for infinite reuse under extreme loads, the system accepts that the beam may need replacement after absorbing a significant impact, simplifying the design.
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 device provides a safe and reliable support structure that significantly reduces passenger injury risk during collisions by effectively dissipating impact forces through controlled deformation, maintaining high stability and comfort without increasing the table's width or restricting knee space.
Implementation Method 1
The bending beam has a specifically introduced weakening structure, which creates a predetermined elasticity of the bending beam. The weakening structure is set up in such a way that, based on a state of the device arranged on the side wall, when a force acting on the table top in the direction of travel of the rail vehicle occurs, it allows a deformation of the bending beam and rotation of the table top relative to the side wall
Implementation Method 2
The deformation is, for example, a plastic change in shape that maintains the deformed state after the application of force and may have to be replaced in order to reestablish a basic state of the device. The bending beam is designed to be plastically deformed with a defined permissible maximum force
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a device (10) for connecting a table to a side wall (3) of a rail vehicle (1), said device comprising: a table top (11) having a top side (111) and a bottom side (112); and a bending beam (13) which is located on the bottom side (112) of the table top (11). The bending beam (13) is coupled to the table top (11) at a first and a second coupling position (16, 18) and is designed to couple the table top (11) to the side wall (3) of the rail vehicle (1) by means of a side wall connection (12). The bending beam (13) has a weakening structure (14, 15) which causes a predefined elasticity of the bending beam (13) meaning that, in relation to a state of the device (10) in which it is positioned on the side wall (3), the bending beam (13) is plastically deformed in a manner predefined by the weakening structure (14, 15) and the tabletop (11) is rotated relative to the side wall (3) when a force (F1, F2) acts on the tabletop (11) in the travel direction (F) of the rail vehicle (1).