Fluid-Filled Vibration Damping Device Cavitation Control
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Solution Overview
Problem
Fluid-filled vibration damping devices struggle to effectively mitigate noises and vibrations caused by cavitation due to impact loads, as existing solutions either require complex structures or are limited by temperature constraints, especially in automotive engine mounts.
Innovation Solution
Incorporating an insoluble powder into the sealed fluid within the primary fluid chamber to act as a bubble nucleus, accelerating the dispersed generation of bubbles and thereby reducing negative pressure and preventing large bubble formation during cavitation, without altering the device's basic structure or limiting its environmental usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a relief valve or short-circuit passage is added to rapidly dispel excessive negative pressure, then cavitation noises are reduced, but device complexity increases
Solution Approach 1:
An insoluble powder is introduced as an intermediary substance into the sealed fluid. The powder particles serve as bubble nuclei that facilitate controlled cavitation, preventing the formation of large cavitation bubbles that cause noises. This mediator approach resolves the contradiction by addressing the harmful effect without adding mechanical components like relief valves or short-circuit passages, thus maintaining device simplicity.
Solution Approach 2:
The invention changes the physical-chemical parameters of the fluid system by adding insoluble powder particles. This modification alters the cavitation behavior of the fluid, enabling bubble formation at lower pressure thresholds and distributing cavitation events throughout the fluid rather than concentrating them. This parameter change effectively reduces cavitation noises without requiring structural modifications to the device.
2Object-affected harmful factors
If liquid with high vapor pressure (low boiling point) is added to minimize cavitation, then bubble generation is accelerated, but temperature adaptability deteriorates
Solution Approach 1:
The invention uses insoluble powder particles as disposable-like elements that remain stable across wide temperature ranges. Unlike volatile liquids with high vapor pressure that boil at low temperatures, the insoluble powder maintains its functionality as a bubble nucleus throughout the entire operating temperature range, including high-temperature environments like automotive engine compartments. This approach provides temperature-adaptable cavitation control.
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 minimizes noises and vibrations by dispersing bubbles over a wide area, reducing the energy impact of their disappearance and preventing large bubble growth, while maintaining the device's simplicity and environmental adaptability.
Implementation Method 1
an insoluble powder mixed in the sealed fluid filling the primary fluid chamber which provides a bubble nucleus and accelerates dispersed generation of bubbles when pressure within the primary fluid chamber is decreased
Implementation Method 2
a primary fluid chamber which gives rise to internal pressure fluctuations based on deformation of a main rubber elastic body at times of vibration input
Implementation Method 3
vibration damping effect will be exhibited on the basis of flow action of a non-compressible sealed fluid which is induced to flow through the orifice passage
Data Source
AI summary
A fluid-filled vibration damping device including: a primary fluid chamber which gives rise to internal pressure fluctuations based on deformation of a main rubber elastic body at times of vibration input; an auxiliary fluid chamber which gives rise to pressure differentials relative to the primary fluid chamber at times of vibration input; an orifice passage which permits a non-compressible sealed fluid filling the primary fluid chamber and the auxiliary fluid chamber to flow between the two fluid chambers; and an insoluble powder mixed in the sealed fluid filling the primary fluid chamber which provides a bubble nucleus and accelerates dispersed generation of bubbles when pressure within the primary fluid chamber is decreased.