Rail Vehicle Bogie Connecting Member Torsional Flexibility
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Solution Overview
Problem
Existing connecting supports for rail vehicle running gear frames either restrict the twisting ability of longitudinal members or compromise on vibration damping, leading to suboptimal running properties due to rigid connections or reduced natural frequency with flexible profiles.
Innovation Solution
A connecting support with strip-shaped support elements having open profiles and non-positive connections via screws or rivets, allowing micro-movements to dampen vibrations and enhance twisting ability, while maintaining adaptability and reducing weight through open profiles and elastomer elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If connecting beams are rigidly connected to longitudinal beams, then structural stability is improved, but torsional flexibility of the longitudinal beams deteriorates
Solution Approach 1:
The connecting beam is designed with a flexible profile (I-section or U-section) that allows dynamic adaptation to track twisting while maintaining connection between longitudinal beams. The profile geometry enables the beam to bend and deform torsionally, providing the necessary flexibility without compromising structural integrity.
Solution Approach 2:
The patent changes the structural parameters of the connecting beam by using open profiles (I-section or U-section) instead of closed sections. This parameter change reduces torsional rigidity while maintaining sufficient bending stiffness, allowing the beam to adapt to track irregularities while connecting the longitudinal beams.
2Adaptability or versatility
If connecting beams are decoupled from longitudinal beams or use torsionally flexible profiles, then torsional flexibility is improved, but natural frequency decreases leading to vibrations
Solution Approach 1:
The patent optimizes the geometric parameters of the I-section or U-section profile to achieve a balance between torsional flexibility and bending stiffness. By carefully selecting the section modulus and moment of inertia, the natural frequency is maintained above critical values while sufficient torsional flexibility is provided for track adaptation.
Solution Approach 2:
The flexible profile design allows the connecting beam to dynamically respond to track conditions through controlled deformation. The profile geometry is designed to permit necessary torsional and bending movements while maintaining sufficient stiffness to avoid excessive vibrations and maintain operational reliability.
3Strength
If rigid connections are used between connecting beams and longitudinal beams, then connection strength is improved, but running characteristics deteriorate due to reduced ability to adapt to track twisting
Solution Approach 1:
The connecting beam uses a flexible I-section or U-section profile that provides dynamic adaptation capability to track twisting while maintaining strong connections to the longitudinal beams. The profile geometry enables controlled deformation that improves running characteristics without compromising connection strength.
Solution Approach 2:
The patent changes the cross-sectional parameters of the connecting beam to open profiles (I-section or U-section) that provide an optimal ratio of connection strength to torsional flexibility. This parameter change allows strong attachments of components while maintaining the ability to adapt to track conditions for improved running characteristics.
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 balances twisting ability and vibration damping, improving the running properties of rail vehicle bogies by allowing greater deformations and reducing torsional rigidity, while maintaining structural integrity and adaptability.
Implementation Method 1
the support elements have profiles opening outwards in opposite directions, are designed in a strip-like form and are connected to each other by at least two connecting means in such a way that the support sections overlap each other at least section by section, wherein at least one fastening element is provided for connecting the connecting beam to a longitudinal beam of the chassis frame and the fastening elements have a contact section which is arranged between fastening sections of the support elements and is connected to the support elements via the connecting means
Implementation Method 2
When the connecting beam is attached to the longitudinal beams in operation, the system is subjected to vibration under load. At the connection points where the fasteners join the support elements, micro-movements occur between the support elements themselves and between the support elements and the fasteners when the system is subjected to vibration. These micro-movements dampen the overall system and thus counteract any increase in oscillation.
Data Source
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AI summary
The invention relates to a connecting member for connecting two longitudinal members of a bogie frame of a rail vehicle, comprising at least one fastening point for receiving add-on components. In order to damp vibrations which occur and thus prevent oscillation of the system, provision is made according to the invention for the connecting member to comprise at least a first member element (1) with a first member portion and a second member element (2) with a second member portion, wherein the member elements (1,2) are connected to one another in a force-fitting manner by at least two connecting means (5) in such a way that the member portions overlap one another at least in certain portions.