Liquid Rubber Composite Node Cavities for Radial-Axial Stiffness Tuning
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Solution Overview
Problem
Existing liquid rubber composite nodes struggle to provide small radial stiffness and large axial stiffness, making it difficult to achieve a large dynamic-static ratio, which is necessary for optimizing product performance.
Innovation Solution
A formation method for liquid rubber composite nodes with middle damping holes involves adding a middle spacer sleeve between the outer sleeve and mandrel, bonding them through rubber vulcanization, and creating damping through holes in the mandrel to form interdependent liquid cavities that communicate with each other, allowing for adjustable radial and axial stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional node structures are used, then structural simplicity is maintained, but the ability to provide both small radial stiffness and large axial stiffness cannot be achieved
Solution Approach 1:
The node is segmented into multiple functional components: outer sleeve, mandrel, rubber layer with cavities, and damping holes. This segmentation allows independent optimization of radial and axial stiffness characteristics, enabling the node to provide small radial stiffness while maintaining large axial stiffness capability
Solution Approach 2:
Different regions of the rubber layer are assigned different functional qualities: the rubber layer with cavities provides radial compliance while the mandrel and outer sleeve structure maintain axial stiffness. The damping holes are strategically positioned to provide localized damping effects without compromising overall structural integrity
2Reliability
If liquid damping cavities are added to provide vibration reduction, then damping performance is improved, but manufacturing complexity increases
Solution Approach 1:
The damping cavities are pre-formed within the rubber layer during the vulcanization process rather than being created afterward. The mandrel is inserted into the rubber layer before vulcanization, creating the cavity structure in advance, which simplifies the overall manufacturing process compared to post-processing methods
Solution Approach 2:
Liquid damping medium is introduced into the pre-formed cavities to provide vibration reduction. The liquid fills the cavities created during vulcanization, converting the structural design into a functional damping system without requiring complex additional manufacturing steps
3Adaptability or versatility
If damping holes are created in the mandrel to communicate liquid cavities, then dynamic stiffness control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The damping holes are formed in the mandrel before the rubber layer is vulcanized around it. This preliminary action allows the holes to be created while the mandrel is accessible and easier to work with, avoiding the difficulty of drilling through cured rubber and ensuring better hole quality and positioning accuracy
Solution Approach 2:
The mandrel serves as an intermediary tool that facilitates the creation of damping holes. By forming holes in the mandrel before final assembly, the mandrel acts as a mold or template that ensures proper hole positioning and geometry, transferring the precision requirements to the mandrel fabrication process where they are more easily met
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 method enables the creation of liquid rubber composite nodes with small radial stiffness and large axial stiffness, achieving a large dynamic-static ratio and optimizing product performance by ensuring effective vibration reduction and dynamic stability.
Implementation Method 1
bonding the middle spacer sleeve and the mandrel together through rubber vulcanization
Implementation Method 2
the liquid flows between the two cavities to generate damping to consume vibration energy
Implementation Method 3
sealed incompressible (viscous) liquid is injected in advance in a cavity
Data Source
AI summary
A formation method for liquid rubber composite nodes with middle damping holes is provided. The formation method includes adding a middle spacer sleeve between an outer sleeve and a mandrel, bonding the middle spacer sleeve and the mandrel together through rubber vulcanization, and assembling the integrated middle spacer sleeve and the mandrel into the outer sleeve; forming damping through holes which penetrate through the mandrel on the mandrel; hollowing the middle spacer sleeve to form a plurality of spaces; after vulcanization, forming a plurality of interdependent liquid cavities by using rubber and the plurality of spaces; and arranging liquid in the plurality of liquid cavities and communicating the plurality of liquid cavities through the damping through holes.