Composite Railway Car Body With Integrated Stiffeners and Lap Joints
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Solution Overview
Problem
Existing methods for manufacturing railway cars in composite materials face challenges in incorporating transverse stiffness without additional weight and cost, particularly in filament winding and panel assembly methods, which require large facilities and complex assembly processes.
Innovation Solution
A composite railway car structure composed of integrated transverse stiffeners and longitudinal beams within separate panels, assembled via lap joints and reinforced with mating parts to maintain structural integrity and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the railway car is manufactured by assembling separate panels, then the need for large winding facilities and specific machinery is eliminated, but the structural rigidity in the transversal direction becomes difficult to maintain without additional stiffeners
Solution Approach 1:
The patent combines the panel structure with integrated transversal stiffeners as a single unified component. The stiffeners are built into the panel during manufacturing, creating an integrated structure that maintains rigidity without requiring separate stiffener elements to be assembled later. This merging of functions resolves the contradiction by achieving both manufacturing simplicity and structural strength.
Solution Approach 2:
The patent employs composite material construction where the panel and stiffener are manufactured as an integrated composite structure. This allows the stiffener to be incorporated during the panel manufacturing process itself, eliminating the need for separate assembly operations while maintaining the required transversal rigidity. The composite material approach enables both ease of manufacture and structural strength to be achieved simultaneously.
2Strength
If additional stiffeners are added as separate elements to the wound tubular structure, then the transversal rigidity is improved, but the assembly complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the stiffener function directly into the panel structure, eliminating the need for separate stiffener elements and their associated assembly operations. The stiffener is integrated during panel manufacturing, reducing assembly complexity while maintaining transversal rigidity.
Solution Approach 2:
The stiffener is prepared and integrated into the panel during the panel manufacturing process itself, rather than being added as a separate step later. This preliminary integration of the stiffener function during panel fabrication eliminates subsequent assembly operations and reduces overall manufacturing complexity.
3Device complexity
If filament winding technology is used to manufacture the whole car body as a single part, then joints between panels are eliminated, but the ability to include reinforcing elements and assign different stiffness to different areas is limited
Solution Approach 1:
The patent segments the car body into separate panels that can be manufactured independently with optimized stiffness characteristics for their specific areas. Each panel can be designed and manufactured to meet the local structural requirements, allowing different stiffness distribution throughout the vehicle while avoiding the complexity of single-part filament winding.
Solution Approach 2:
The patent applies local quality by customizing the stiffness characteristics of each panel according to the specific structural requirements of different areas of the car body. This allows optimal stiffness distribution without requiring the entire structure to be manufactured as a single homogeneous part, thereby eliminating joint assembly complexity while maintaining adaptability.
4Ease of manufacture
If separate panels are assembled together, then the manufacturing facilities and machinery requirements are reduced, but the stiffness in the joints becomes a weakness in the final structure
Solution Approach 1:
The patent merges the stiffener function into the panel structure itself, creating an integrated component that maintains joint stiffness without requiring additional separate elements. The stiffener is built into the panel during manufacturing, ensuring adequate stiffness at joints while keeping manufacturing facilities and machinery requirements reduced.
Solution Approach 2:
The patent uses composite material construction to create panels with integrated stiffeners that maintain joint stiffness. The composite material allows for the creation of a unified structure that combines the benefits of separate panel manufacturing with the strength of integrated stiffening, resolving the contradiction between ease of manufacture and joint stiffness.
Data Source
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AI summary
A composite railway car body structure comprising lateral panels, roof panel and floor panel, the panels manufactured in composite materials, and also comprising four longitudinal beams located in the corners of the car body structure, those beams embedded in the floor and roof panels. The panels are assembled together by making lap joints between the lateral panels and longitudinal flaps pertaining to the roof and floor panels. The composite railway car body structure may also have integral stiffeners integrated in the panels, and mating parts to give continuity to those stiffeners in the final assembled car body thus creating closed frames for the car body structure.