Variable Thickness I-Beam Web for Railway Truck Stability
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Solution Overview
Problem
The existing manufacturing processes for rail vehicle side frames are time- and labor-intensive, costly, and susceptible to twisting under transverse loads due to their traditional I-beam construction, which lacks sufficient transverse capacity and efficiency in distributing stresses.
Innovation Solution
The design and method of forming I-beams with a web that increases in thickness away from a neutral axis towards the flanges, distributing stresses evenly and increasing the cross-sectional area to enhance stability and resistance to buckling and twisting, allowing for efficient formation of robust and reliable truck assembly components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional I-beam construction is used for side frames, then bending and shear load carrying capacity is efficient, but transverse load resistance is insufficient causing twisting and buckling
Solution Approach 1:
The patent applies local quality by varying the thickness of the web along its length, making it thicker at locations where transverse loads are expected and thinner where bending loads dominate. This creates regions of different structural properties within the single component, optimizing both bending strength and transverse stability without requiring a completely different beam configuration.
2Stability of the object's composition
If hollow box or tubular construction is used for side frames, then transverse load resistance and anti-twisting capacity are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent employs parameter changes by modifying the thickness parameter of the web in the I-beam construction. Instead of changing the fundamental structural configuration to hollow boxes or tubes, the invention optimizes the existing I-beam parameters (specifically web thickness distribution) to achieve improved transverse load resistance while maintaining the simpler manufacturing process associated with I-beam fabrication.
3Ease of manufacture
If uniform thickness I-beam is used, then manufacturing is simpler, but stress distribution is uneven leading to inefficiency
Solution Approach 1:
The invention transitions from uniform to non-uniform web thickness, creating local quality variations that optimize stress distribution. The web is made thicker at locations experiencing higher transverse and bending stresses, and thinner where stresses are lower, thereby improving overall structural efficiency while still maintaining relative manufacturing simplicity compared to hollow box constructions.
Data Source
AI summary
A truck assembly is configured to travel along a track having rails, and includes a first side frame, a second side frame, and a bolster extending between the first side frame and the second side frame. One or more of the first side frame, the second frame, or the bolster includes at least a portion formed as an I-beam that includes a web having a first end and a second end opposite from the first end, a first flange extending from the first end of the web, and a second flange extending from the second end of the web. A thickness of the web increases away from a first neutral axis towards the first flange and the second flange.