Gondola Car Floor Structure Without Side Sills
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Solution Overview
Problem
There is a need to reduce the weight of gondola cars in the railroad freight industry while maintaining structural integrity and allowing for easy cleaning and modification to carry different types of cargo, as traditional designs with side sills are heavy and complex to manufacture.
Innovation Solution
The design of a gondola car with a floor panel and shear web members that eliminate the need for side sills, using a monolithic steel sheet for the floor and side beams, and incorporating structural knees and stiffeners to distribute loads and facilitate cleaning through movable access ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional side sills are used in gondola car construction, then structural strength is maintained, but weight increases and manufacturing complexity increases
Solution Approach 1:
The patent removes the side sill component from the gondola car structure entirely. The side beams are redesigned to extend directly from the floor panels to the top chords, eliminating the need for side sills. This extraction of the unnecessary component reduces weight while maintaining structural integrity through the simplified direct connection of side beams to floor panels and top chords.
Solution Approach 2:
The patent merges the side beam and floor panel into a more integrated structure. The side beams are directly attached to the floor panels without intermediate components, creating a unified load-bearing system. This merging eliminates gaps and weak points while reducing the total number of parts, thereby reducing weight and simplifying manufacturing.
2Ease of manufacture
If traditional side sills and complex beam structures are used, then structural integrity is maintained, but manufacturing complexity increases
Solution Approach 1:
The side sill component is extracted from the structure, reducing the number of parts that need to be manufactured and assembled. This elimination of unnecessary components directly reduces manufacturing complexity and the number of welding or fastening operations required.
Solution Approach 2:
The structure is merged into fewer, more integrated components. Side beams extend continuously from floor panels to top chords, creating longer but simpler members that reduce the total number of joints and connections required during manufacturing, thereby simplifying the production process.
3Quantity of substance
If traditional gondola car design is used, then cargo carrying capacity is maintained, but weight reduction opportunities are lost
Solution Approach 1:
By removing the side sill component, the patent reduces the overall weight of the car body. This weight reduction directly increases the payload capacity since the total gross weight limit remains constant, allowing more lading to be carried without exceeding regulatory weight limits.
Solution Approach 2:
The patent changes the structural parameters by eliminating intermediate support components and using longer, more efficient load-bearing members. This reconfiguration of structural parameters optimizes the strength-to-weight ratio, enabling weight reduction while maintaining the ability to carry the same or greater lading weight.
Data Source
AI summary
A rail road freight car may have a body for carrying lading. The body may be a gondola car body. The car body may include a decking or floor structure, and may include longitudinally extending side beams bordering the floor structure. The connection of the side beams to the floor structure may be may without the use of a dedicated side sill. The car body structure may include cross-bearers and side beam stiffeners that are joined together by structural knees. The car body may also include clean out ports to facilitate cleaning of the lading receptacle.