Liquid Rubber Composite Node Cavities for Radial and Axial Stiffness
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Solution Overview
Problem
Existing liquid rubber composite nodes struggle to achieve a balance of small radial stiffness and large axial stiffness, which is necessary for a high dynamic-static ratio, a requirement for optimizing their performance.
Innovation Solution
A formation method for liquid rubber composite nodes with a tubular flow channel is developed, involving a middle spacer sleeve between the outer sleeve and mandrel, bonded through rubber vulcanization, with a tubular flow channel installed in the mandrel and hollowed spaces forming interdependent liquid cavities that communicate through the channel, allowing for adjustable radial and axial stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional liquid rubber composite nodes are designed with traditional cavity structures, then the basic damping function is achieved, but the dynamic-static stiffness ratio cannot be optimized due to inability to provide both small radial stiffness and large axial stiffness simultaneously
Solution Approach 1:
The rubber component is divided into multiple independent cavities (first cavity, second cavity, third cavity) with different functions. The first and second cavities form a liquid damping system for radial stiffness control, while the third cavity provides axial stiffness. This segmentation allows independent optimization of radial and axial stiffness characteristics, achieving high dynamic-static ratio without excessive complexity.
Solution Approach 2:
Different cavities are designed with different local properties: the first and second cavities are configured for liquid damping with specific flow channels to provide small radial stiffness, while the third cavity is designed as a gas cushion cavity to provide large axial stiffness. This local quality differentiation enables the node to exhibit anisotropic stiffness characteristics required for high dynamic-static ratio.
2Reliability
If multiple cavities are designed to achieve anisotropic stiffness, then small radial stiffness and large axial stiffness can be obtained, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
Multiple cavities (first, second, and third cavities) are integrated into a single rubber component through one-step vulcanization molding. The rubber material forms all cavity structures simultaneously during the vulcanization process, eliminating the need for separate assembly steps. This merging approach maintains the complex multi-cavity structure while significantly simplifying manufacturing and assembly, ensuring reliable stiffness performance without excessive complexity.
Solution Approach 2:
The flow channels and cavity structures are pre-formed within the rubber component during the vulcanization molding process. The liquid damping channels connecting the first and second cavities, as well as the gas cushion cavity structure, are created in advance as integral parts of the rubber component. This preliminary action eliminates the need for post-assembly operations and ensures the structural integrity required for reliable stiffness performance.
3Adaptability or versatility
If liquid damping channels are designed for low frequency vibration damping, then curve passing performance is improved, but high frequency vibration isolation capability may be compromised
Solution Approach 1:
The flow channels are designed with local quality variations to achieve frequency-selective damping. The channels connecting the first and second cavities are configured with specific dimensions and geometries optimized for low frequency vibration damping during curve passing. Meanwhile, the third gas cushion cavity provides a different local quality for high frequency vibration isolation, allowing the node to handle both frequency ranges effectively without requiring extremely precise flow channel manufacturing.
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 effectively provides small radial stiffness and large axial stiffness, achieving a high dynamic-static ratio and enhancing the product's performance by ensuring reliable liquid flow and assembly quality, while the multi-disc spacer sleeve design improves volume and sealing efficiency.
Implementation Method 1
two cavities are communicated through a flow channel design and sealed incompressible (viscous) liquid is injected in advance in a cavity. Under the action of load, the volumes in the two cavities are changed and the liquid flows between the two cavities to generate damping to consume vibration energy to achieve the purpose of attenuating vibration.
Implementation Method 2
a rubber component, two cavities are communicated through a flow channel design
Implementation Method 3
a tubular flow channel is developed, involving a middle spacer sleeve between the outer sleeve and mandrel, bonded through rubber vulcanization, with a tubular flow channel installed in the mandrel and hollowed spaces forming interdependent liquid cavities that communicate through the channel
Data Source
AI summary
A formation method for liquid rubber composite nodes with a tubular flow channel 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; installing a tubular flow channel in 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 tubular flow channel.