Rubber-Metal Elastic Component for Axial-Radial Stiffness Decoupling
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Solution Overview
Problem
Existing elastic components in rail vehicles face challenges in meeting the requirements for high axial stiffness and low radial and deflection stiffness, especially under high-speed operating conditions, leading to fatigue issues due to limited comprehensive vibration reduction and isolation capabilities.
Innovation Solution
The method involves an elastic compounded component with multiple free surfaces and an axial precompression and suspended load bearing structure, combining elastic and metallic components to increase axial stiffness while reducing radial and deflection stiffness, utilizing a rubber-metal compounded design with three free surfaces at different angles and positions to distribute stress and enhance fatigue life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing elastic component structures are used, then manufacturing and structural simplicity are maintained, but axial stiffness is insufficient while radial and deflection stiffness cannot be reduced adequately
Solution Approach 1:
The elastic component is divided into multiple independent elastic elements arranged in specific patterns. Each element contributes to different stiffness characteristics, allowing the system to achieve high axial stiffness through cumulative effect while maintaining low radial and deflection stiffness through the segmented architecture.
Solution Approach 2:
Different regions of the elastic component are designed with different stiffness characteristics. The elastic elements are strategically positioned and oriented to provide high stiffness in the axial direction while being compliant in radial and deflection directions, creating local quality variations that satisfy contradictory stiffness requirements.
2Reliability
If elastic component stiffness is increased to meet high-speed operation requirements, then vibration reduction capability improves, but fatigue resistance deteriorates due to increased stress
Solution Approach 1:
By segmenting the load-bearing function across multiple elastic elements, the stress on each individual element is reduced compared to a single monolithic component. This segmentation allows the system to achieve the required vibration reduction capability through collective stiffness while each element operates within safer stress limits, extending fatigue life.
Solution Approach 2:
The elastic component uses composite material construction combining elastic elements with supporting structures. This composite approach allows optimization of material properties to achieve high vibration isolation performance while managing stress distribution to improve fatigue resistance under high-speed operating conditions.
3Strength
If single-direction stiffness optimization is applied, then one directional performance improves, but comprehensive vibration reduction and isolation performance in all directions deteriorates
Solution Approach 1:
The elastic component is designed with multi-functional capability to simultaneously provide vibration reduction and isolation performance in multiple directions. The arrangement and configuration of elastic elements are optimized to deliver comprehensive performance across axial, radial, and deflection directions, making the component adaptable to complex multi-directional vibration environments.
Solution Approach 2:
The design transitions from single-direction stiffness optimization to multi-dimensional stiffness control. By configuring elastic elements in three-dimensional space with specific orientations and arrangements, the component achieves independent control over stiffness characteristics in different directions, enabling comprehensive vibration reduction performance.
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
This approach significantly increases axial stiffness, reduces radial and deflection stiffness, and enhances the comprehensive vibration reduction and isolation performance, effectively meeting the demands of high-speed train motor suspension systems by distributing stress and improving stability.
Implementation Method 1
the elastic material has three free surfaces after being compounded, so that the stress of the elastic material in all directions is substantially reduced
Implementation Method 2
an elastic compounded component which can effectively increase the comprehensive performance of the vibration reduction and isolation
Implementation Method 3
The method involves an elastic compounded component with multiple free surfaces and an axial precompression and suspended load bearing structure, combining elastic and metallic components to increase axial stiffness
Implementation Method 4
The suspended bearing structure means that at least one of the metallic components of the elastic subcomponent is in a suspended state while they are working, so that the metallic component does not bear the load in radial direction
Implementation Method 5
combining elastic and metallic components to increase axial stiffness while reducing radial and deflection stiffness, utilizing a rubber-metal compounded design
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A method for increasing axial stiffness, reducing radial and deflection stiffness of an elastic compounded component, which can increase axial stiffness and reduce radial and deflection stiffness of the elastic compounded component by axial precompression and suspended load bearing structure its elastic subcomponent with multiple free surfaces, wherein the elastic subcomponent with multiple free surfaces is a compounded elastic component of elastic material and metallic components (2) , the elastic subcomponent has three or more free surfaces after being compounded, so that the stress of the elastic subcomponent in all directions is substantially reduced, and the fatigue life of the elastic subcomponent (3) is prolonged; the axial precompression means that the elastic subcomponent is always in an axial compressed state while they are working, so that the axial stiffness is substantially increased; the suspended bearing structure means (1) that at least one of the metallic component of the elastic subcomponent is in a suspended state while they are working, so that the metallic component does not bear the load in radial direction on one hand, and thus the elastic material at this position is in a shearing state completely and only provide very little radial and deflection stiffness, on the other hand, the suspended metallic component will bear the load in axial direction and make great contribution to axial stiffness, thereby increasing axial stiffness, reducing radial and deflection stiffness of the elastic compounded component.