Rail Vehicle Front Bracket Assembly for Crash Plate Protection
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Solution Overview
Problem
Existing front-end arrangements for rail vehicles fail to prevent equipment, such as wiper motor units, from piercing through crash-resistant plates during impacts, compromising the integrity of the driver's cabin or passenger compartment.
Innovation Solution
A bracket assembly with plastically deformable regions is used to pivot and reorient equipment relative to the crash-resistant plate, distributing impact forces and preventing piercing by creating a larger contact area, thereby maintaining the integrity of the crash-resistant plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If equipment is rigidly fixed to the crash-resistant plate, then the equipment is securely attached, but the equipment may pierce through the plate during impact
Solution Approach 1:
The bracket assembly incorporates plastically deformable regions that allow the structure to dynamically change its configuration during impact. The bracket transitions from a rigid fixed state to a deformable state, enabling the equipment to pivot and reorient away from the crash-resistant plate, thus preventing piercing while maintaining secure attachment under normal conditions
Solution Approach 2:
The bracket assembly includes regions with reduced cross-section and lower quadratic moment of area, creating plastically deformable zones with different mechanical properties. These regions are designed to yield at specific stress thresholds, changing the structural parameters of the bracket during impact to enable pivoting movement and prevent piercing
2Length of moving object
If the equipment is positioned close to the crash-resistant plate, then space is optimized, but the equipment may contact and pierce the plate during impact
Solution Approach 1:
The bracket assembly enables the equipment to move from a one-dimensional linear impact path to a two-dimensional pivoting arc. By creating a pivot area through plastically deformable regions, the equipment follows a curved trajectory during impact, increasing the contact area with the crash-resistant plate and distributing stress to prevent piercing
3Strength
If a robust bracket assembly is used to secure equipment, then attachment strength is improved, but the bracket may transmit excessive force to pierce the plate
Solution Approach 1:
The bracket assembly features non-uniform cross-section with specific regions having reduced dimensions and lower quadratic moment of area. These plastically deformable regions are strategically positioned to absorb and redistribute impact forces, allowing the overall bracket to maintain high attachment strength while local regions yield to prevent excessive force transmission to the crash-resistant plate
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 reduces the risk of the equipment piercing through the crash-resistant plate by ensuring a larger contact area and distributing mechanical stress, ensuring the physical integrity of the plate during impacts, and can withstand significant forces and torque loads.
Implementation Method 1
a force applied to the front end of the piece of equipment towards the crash-resistant plate parallel to the front direction above a force threshold results in plastic bending of the first plastically deformable region
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A front arrangement (1) for a rail vehicle, comprises a crash-resistant plate (20), a piece of equipment (30) and a bracket assembly (40), which includes a frame (41) positioned at a distance from the crash-resistant plate (20) for supporting and fixing the piece of equipment (30) and at least a first bracket (42a) linking the frame (41) to the crash-resistant plate (20). The first bracket (42a) has a first plastically deformable region (R1) which is located at a distance from a reference axis (100) parallel to the front direction and crossing a front end (31) of the piece of equipment. The first plastically deformable region (R1) defines a first pivot area (43a), such that a force applied to the front end (31) of the piece of equipment (30) towards the crash-resistant plate (20) parallel to the front direction above a force threshold results in plastic bending of the first plastically deformable region (R1) and a pivoting movement of the piece of equipment (30) and frame (41) about the first pivot area (43a).