Eddy Current Magnetic Shock Absorber for Low-Frequency Vibration
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Solution Overview
Problem
Traditional passive shock absorbers are inadequate for precision devices due to poor low-frequency isolation and ultra-low frequency vibration reduction, leading to the development of semi-active and active vibration reduction technologies with their own limitations.
Innovation Solution
A single-degree-of-freedom magnetic damping shock absorber based on the eddy current effect, utilizing a ring-shaped magnet, copper sheets, and a coil spring to generate damping force and reduce vibration energy, featuring a compact structure with adjustable components for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional passive shock absorbers are used, then the structure is simple and reliable, but the low frequency isolation and ultra-low frequency vibration reduction effects are poor
Solution Approach 1:
The patent replaces traditional mechanical damping elements with a magnetic damping system based on eddy current effect. The magnetic damping element generates damping force through electromagnetic interaction between permanent magnets and conductive materials, eliminating the need for complex mechanical structures while achieving superior vibration reduction performance across all frequency ranges
Solution Approach 2:
The patent employs composite material structures including permanent magnets, conductive materials (copper or aluminum), and magnetic damping elements. This combination of materials with different properties (magnetic, conductive, elastic) creates a hybrid damping system that leverages both electromagnetic and mechanical properties to achieve high reliability and precision vibration control
2Manufacturing precision
If active control mode shock absorbers are used, then the system performance is extremely improved, but the cost is higher due to external power supply requirements
Solution Approach 1:
The magnetic damping element generates damping force autonomously through the eddy current effect when subjected to vibration, without requiring external power supply or active control systems. The system self-regulates by converting mechanical vibration energy into electrical energy (eddy currents) which then dissipates as heat, providing passive yet highly effective vibration reduction
Solution Approach 2:
The patent replaces complex active control systems with a passive magnetic damping mechanism that achieves similar or superior performance through electromagnetic principles, eliminating sensors, power supplies, and control electronics while maintaining high vibration reduction precision
3Use of energy by moving object
If semi-active control mode shock absorbers are used, then the vibration reduction effect is excellent with low energy consumption, but there are limitations in use
Solution Approach 1:
The patent incorporates adjustable parameters in the magnetic damping element, such as adjustable air gaps between magnets and conductive materials, adjustable magnet strengths, or adjustable conductive material configurations. This allows the damping characteristics to be dynamically tuned for different vibration frequencies and amplitudes, enhancing adaptability across various applications while maintaining passive operation and low energy consumption
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 SDOF magnetic damping shock absorber achieves high damping force, strong cushioning, and effective vibration reduction, improving system performance and adaptability across various environments with reduced energy consumption.
Implementation Method 1
SDOF magnetic damping shock absorber based on eddy current effect
Implementation Method 2
the ring-shaped magnet a and the ring-shaped magnet b are provided by magnetic attraction
Implementation Method 3
a coil spring is provided between an upper end of the lower plate and a lower end of the stepped shaft
Data Source
AI summary
The present disclosure provides a single-degree-of-freedom (SDOF) magnetic damping shock absorber based on an eddy current effect, comprising a lower plate, a ring-shaped magnet a, a ring-shaped magnet b, an aluminum cylinder, a bottom copper sheet, a copper sheet, a top copper sheet, a bearing seat, a linear bearing, a bearing end cap, a load, a piston shaft, a stepped shaft, a fixed collar, a coil spring, a lower clamping shaft, and fixing screws. When the shock absorber is working, the ring-shaped magnet a keeps stationary at the lower end and the ring-shaped magnet b reciprocates in the vertical direction. Both magnets are arranged in a mutual attraction manner. Under the action of a time-varying electromagnetic field generated by the relative movement of the ring-shaped magnet b, the copper sheet arranged between the two ring-shaped magnets generates eddy current damping. The movement of the ring-shaped magnet b is inhibited.