Magnetic Fluid Damper Structure for Low-Frequency Vibration Damping
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Solution Overview
Problem
Existing magnetic fluid dampers face issues such as brittle permanent magnets breaking during launch, difficulty in processing complex magnet shapes, and poor damping effects due to small friction surfaces, limiting their practicality in spaceflight and ground applications.
Innovation Solution
A magnetic fluid damper design featuring a housing with alternating mass blocks and energy dissipation assemblies comprising permanent magnets and porous medium members filled with magnetic fluid, where each mass block receives unequal restoring forces, enhancing damping through viscous dissipation and friction energy conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent magnet is used as a damping mass block, then magnetic fluid damper can achieve low-frequency and small-amplitude vibration damping, but the permanent magnet may break during spacecraft launch due to great acceleration and collisions
Solution Approach 1:
The patent introduces a cushioning structure between the permanent magnet and the housing wall, which provides protective cushioning in advance to prevent the permanent magnet from breaking during spacecraft launch due to great acceleration and collisions. This resolves the contradiction by protecting the fragile magnet while maintaining its damping function.
2Reliability
If the shape of permanent magnet is changed to improve damping effects, then damping performance can be enhanced, but the permanent magnet is hard to process especially for complex patterns
Solution Approach 1:
The patent divides the damping system into separate components: the permanent magnet maintains a simple cubic shape for easy manufacturing, while the damping function is enhanced through the addition of porous medium members with magnetic fluid. This segmentation allows the magnet to be easily manufactured while still achieving improved damping effects through the combined system.
3Device complexity
If a traditional permanent magnet structure is used, then the structure is simple, but the friction surface is small leading to poor damping effect
Solution Approach 1:
The patent introduces porous medium members filled with magnetic fluid to increase the friction surface area between the damping mass block and the magnetic fluid. The porous structure provides multiple contact surfaces, significantly enhancing the damping effect while maintaining relative structural simplicity. This resolves the contradiction by expanding the effective friction area without overly complicating the overall structure.
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 provides a stable and enhanced damping effect by increasing friction and viscous energy dissipation, reducing the risk of magnet breakage and improving damping performance for low-frequency vibrations.
Implementation Method 1
pores of the first porous medium member of each of the at least one energy dissipation assembly are filled with first magnetic fluid
Implementation Method 2
shearing effects are generated due to relative motion between the permanent magnet and magnetic fluid, leading to energy dissipation
Implementation Method 3
each of the at least one energy dissipation assembly includes a first permanent magnet and a first porous medium member, the first permanent magnet of each of the at least one energy dissipation assembly
Implementation Method 4
shearing effects are generated due to relative motion between the permanent magnet and magnetic fluid, leading to energy dissipation
Implementation Method 5
a plurality of reset parts cooperating with the plurality of mass blocks in one-to-one correspondence to apply restoring forces to the plurality of mass blocks
Data Source
AI summary
A magnetic fluid damper includes a housing defining a cavity; a plurality of mass blocks located in the cavity and spaced from each other in a first direction; at least one energy dissipating assembly, in which the plurality of mass blocks and the at least one energy dissipating assembly are arranged alternately along the first direction in the cavity, in which each energy dissipating assembly includes a first permanent magnet and a first porous medium member, pores of each first porous medium member being filled with first magnetic fluid; and a plurality of reset parts cooperating with the plurality of mass blocks in one-to-one correspondence to apply restoring forces in a second direction to the mass blocks, in which restoring forces received by two mass blocks adjacent in the first direction are not equal.