Liquid Inertia Vibration Mount Using Poly Tungstate Fluid
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Solution Overview
Problem
Current vibration isolation systems in aircraft, particularly rotary wing aircraft, face challenges in minimizing size, weight, and complexity while maintaining effective vibration attenuation, often requiring radical redesigns and are limited by the fixed density of conventional tuning fluids like mercury and fluorinated fluids.
Innovation Solution
The use of a polytungstate fluid as a tuning fluid in a vibration isolator, which can be tailored in density to adjust the isolation frequency, allowing for a more compact and lightweight design without the need for physical alterations to the isolator components, and enabling fine-tuning of the isolator's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional tuning fluids (mercury or fluorinated fluids) are used in vibration isolators, then the isolator can achieve vibration attenuation, but the isolator size and weight cannot be minimized and the isolation frequency cannot be adjusted without physical redesign
Solution Approach 1:
The patent applies parameter changes by using polytungstate fluids with varying densities to adjust the isolation frequency of the vibration isolator. By changing the density parameter of the tuning fluid, the isolator's performance can be optimized for different vibration frequencies without requiring physical redesign of the isolator structure. This resolves the contradiction by enabling adaptability through fluid selection rather than structural modification.
2Weight of moving object
If the isolator design is optimized for minimum size and weight, then payload capacity increases, but the ability to adjust isolation frequency is limited
Solution Approach 1:
The patent maintains minimum isolator size and weight while achieving tuning flexibility by selecting from polytungstate fluids with different densities. The fluid's density parameter is changed to adjust isolation frequency, allowing the compact isolator design to remain adaptable without adding mechanical complexity or increasing size.
3Device complexity
If fixed-density fluids are used in vibration isolators, then the isolator structure can be simplified, but the isolation frequency cannot be fine-tuned
Solution Approach 1:
The patent uses polytungstate fluids with precisely controlled densities to achieve fine-tuning of isolation frequency. The fluid density parameter can be adjusted in small increments, enabling precise frequency control without complicating the isolator structure. This resolves the contradiction by providing manufacturing precision through fluid property control rather than structural refinement.
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
The polytungstate fluid enables a decrease in size and weight of the isolator, reduces manufacturing costs, and allows for flexible adjustment of the isolation frequency, enhancing the efficiency and payload capacity of aircraft by modifying the fluid's density rather than altering the isolator's physical structure.
Implementation Method 1
A vibration isolator utilizes inertial forces (m{"umlaut over (x)}") to cancel elastic forces (kx)
Implementation Method 2
The acceleration of an oscillating mass is 180° out of phase with its displacement
Data Source
AI summary
A vibration isolator can include an upper housing defining an upper fluid chamber; a lower housing defining a lower fluid chamber; a piston resiliently coupled to the upper housing with an upper elastomer member, the piston being resiliently coupled to the lower housing with a lower elastomer member; a tuning passage associated with the piston; and a tuning fluid disposed within the upper fluid chamber, the lower fluid chamber, and the tuning passage, the tuning fluid comprising a polytungstate.