Fluid Damper Chamber Layout for MR Fluid Wear Isolation
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Solution Overview
Problem
The use of magneto-rheological (MR) fluid in mechanical applications is hindered by its high viscosity and abrasiveness, which can lead to mechanical systems being unable to handle dynamic loads and rapid wear due to the ferrous particles in the fluid.
Innovation Solution
A fluid damper design incorporating a first fluid-filled chamber, a second chamber with variable flow characteristics filled with MR fluid, and a gas chamber, where the MR fluid is kept close to an electromagnet to control viscosity and is isolated from abrasive effects, using flexible end walls and an electromagnet with adjustable magnetic field to manage flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MR fluid is used to provide variable viscosity for dampening control, then dampening efficiency is improved, but mechanical components experience rapid wear due to abrasiveness
Solution Approach 1:
The damper is divided into two separate chambers: a first chamber containing MR fluid for dampening control, and a second chamber containing non-abrasive fluid for volume displacement. This segmentation isolates the abrasive MR fluid from contact with mechanical components like seals and pistons, eliminating wear while preserving dampening functionality.
Solution Approach 2:
A non-abrasive fluid acts as an intermediary substance in the second chamber, performing the volume displacement function that would otherwise require direct contact with MR fluid. This intermediary prevents the abrasive particles from contacting mechanical components while still enabling the desired dampening effect through magnetic field control.
2Adaptability or versatility
If MR fluid is used to control viscosity, then variable dampening is achieved, but mechanical systems cannot handle dynamic loads due to high viscosity
Solution Approach 1:
The system segments the fluid functions: MR fluid in the first chamber provides variable viscosity for adaptability, while non-abrasive fluid in the second chamber handles volume displacement and dynamic load support. This allows the system to achieve variable dampening without sacrificing dynamic load handling capability.
Solution Approach 2:
The MR fluid's viscosity parameter is changed dynamically through magnetic field application, allowing the system to adapt dampening characteristics. When magnetic field is applied, MR fluid becomes highly viscous for dampening; when not applied, it returns to low viscosity state, preventing resistance to dynamic loads.
3Adaptability or versatility
If MR fluid is used in mechanical systems, then variable rheology control is achieved, but system complexity increases due to isolation requirements
Solution Approach 1:
The damper is segmented into two chambers separated by a piston, with MR fluid confined to the first chamber and non-abrasive fluid in the second chamber. This segmentation provides the necessary isolation to use MR fluid while keeping the overall structure relatively simple and manageable.
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 design effectively manages dampening by controlling the viscosity of the MR fluid and reduces abrasive wear, allowing for efficient handling of dynamic loads while minimizing the wear on mechanical components.
Implementation Method 1
Magneto rheological fluid (MR fluid) is a variable character fluid comprising a (e.g. colloid like) suspension of micrometer-sized particles in a carrier fluid, often a type of oil. When subjected to a magnetic field, the fluid greatly increases its apparent viscosity and/or shear strength.
Implementation Method 2
a gas chamber, the gas chamber compressible due to the displacement of the second chamber
Data Source
AI summary
A spring for a suspension is described. The spring includes: a spring chamber divided into at least a primary portion and a secondary portion, and a fluid flow path coupled with and between the primary portion and the secondary portion. The fluid flow path includes a bypass mechanism, wherein the bypass mechanism is configured for automatically providing resistance within the fluid flow path in response to a compressed condition of the suspension.