Anti-Vibration Device Liquid Mixture Cavitation Noise
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Solution Overview
Problem
Conventional anti-vibration devices experience complications and worsened attenuation performance due to the need for complex configurations and difficult fluid pressure tuning, leading to abnormal noise generation from cavitation.
Innovation Solution
The use of a mixture of insoluble first and second liquids with different surface tensions and vapor pressures in the anti-vibration device, where the second liquid is dispersed in the first liquid, minimizes cavitation and shock waves, reducing abnormal noise without requiring additional mechanisms like valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a communication hole and valve are added to prevent cavitation, then abnormal noise is reduced, but device complexity increases
Solution Approach 1:
The patent removes the valve and communication hole from the system entirely. Instead of adding components to prevent cavitation, the invention extracts these harmful elements and replaces them with a specially formulated liquid mixture that passively prevents cavitation through its physical properties (surface tension and vapor pressure characteristics), thereby reducing device complexity while still eliminating abnormal noise.
Solution Approach 2:
The patent changes the physical parameters of the liquid by using a mixture of two liquids with different surface tensions and vapor pressures. This parameter change allows the liquid to resist cavitation naturally without requiring mechanical valves or communication holes, thus solving the noise problem without increasing device complexity.
2Object-affected harmful factors
If a valve is added to control fluid pressure, then cavitation is prevented, but attenuation performance worsens due to difficulty in tuning
Solution Approach 1:
The liquid mixture serves itself to prevent cavitation through its inherent physical properties. The combination of liquids with different surface tensions and vapor pressures creates a self-regulating system that resists cavitation formation without requiring external control mechanisms like valves, thereby maintaining reliable attenuation performance without tuning difficulties.
Solution Approach 2:
By changing the physical parameters of the liquid (surface tension and vapor pressure) through mixing two different liquids, the system achieves cavitation resistance without needing adjustable valves. This eliminates the tuning problem entirely while maintaining effective cavitation prevention and attenuation performance.
3Object-affected harmful factors
If the liquid mixture is used to suppress cavitation, then abnormal noise is reduced, but the structure remains simple without additional mechanisms
Solution Approach 1:
The patent achieves noise reduction by changing the physical parameters of the existing liquid (surface tension and vapor pressure) through creating a mixture of two liquids. This approach suppresses cavitation and abnormal noise while maintaining structural simplicity, as no additional mechanisms or components are required.
Solution Approach 2:
The patent uses a composite liquid material consisting of two different liquids mixed together. This composite material has combined properties (surface tension and vapor pressure characteristics) that naturally suppress cavitation and reduce abnormal noise, all while keeping the device structure simple without additional mechanisms.
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 effectively reduces abnormal noise generation while maintaining attenuation performance and simplifying the device structure, as the dispersed second liquid interferes with and cancels out shock waves, preventing them from propagating and reducing the overall noise magnitude.
Implementation Method 1
the surface tension of the second liquid is smaller than the surface tension of the first liquid
Implementation Method 2
cavitation by which a number of bubbles are generated in the liquid within the main liquid chamber occurs
Implementation Method 3
shock waves are generated, and these shock waves propagate to metallic materials
Implementation Method 4
the second liquid which has become granular is dispersed in the first liquid... the second liquid interferes with and cancels out shock waves
Data Source
Figure 1
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Figure 4
AI summary
An anti-vibration device includes a tubular first attachment member connected to either a vibration generating section or a vibration receiving section; a second attachment member connected to the other of the vibration generating section and the vibration receiving section; a first rubber elastic body elastically interconnecting the first and second attachment members; a liquid containing a first liquid and a second liquid which are insoluble in each other, the second liquid having a smaller surface tension than the first liquid, and the second liquid in the liquid weighing less than the first liquid in the liquid; a partition member partitioning the inside of the first attachment member into a main liquid chamber and a sub liquid chamber, the main liquid chamber having a first partition wall and having a portion of the liquid enclosed therein, an inner volume of the main liquid chamber changing due to deformation of the first rubber elastic body, a part of the first partition wall being formed of the first rubber elastic body; and the sub liquid chamber having a second partition wall and having a portion of the liquid enclosed therein, at least a part of the second partition wall being adapted to be deformable, the liquid being enclosed in the main liquid chamber and the sub liquid chamber; and an orifice passage provided between the outer peripheral surface of the partition member and the inner peripheral surface of the first attachment member so as to communicate the main liquid chamber and the sub liquid chamber.