Self-Resetting Tuned Mass Damper Using Eddy Current and SMA Damping
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Solution Overview
Problem
Traditional tuned mass dampers have limited vibration reduction efficiency due to small design mass and require cumbersome maintenance, with low damping energy consumption and inefficient energy dissipation.
Innovation Solution
A self-resetting tuned mass damper combining eddy current and shape memory alloy technology, featuring a hollow box, cover plate, mass block, gears, copper sheets, permanent magnets, and shape memory alloys, which generates damping forces through eddy currents and strain energy dissipation, allowing for high energy consumption and low maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mass of the tuned mass damper is increased to improve vibration reduction efficiency, then the vibration reduction performance is improved, but the installation space requirement increases and the device complexity increases
Solution Approach 1:
The patent combines eddy current damping mechanism and shape memory alloy resetting mechanism into a single tuned mass damper system. The eddy current damper generates damping force through electromagnetic induction when the mass block moves, while the shape memory alloy provides automatic resetting capability, merging multiple functions into one integrated device that achieves high vibration reduction efficiency without proportionally increasing complexity
Solution Approach 2:
The patent uses shape memory alloy, a composite material with special mechanical properties including significant shape memory effect and phase transition superelasticity. This material enables the damper to automatically reset after deformation through its ability to recover large strains (6%-8%), providing high damping energy consumption capability and automatic recovery function without requiring complex external resetting mechanisms
2Ease of manufacture
If traditional damping mechanisms are used to dissipate vibration energy, then the structure is simple, but the damping energy consumption is low and maintenance is cumbersome
Solution Approach 1:
The patent replaces traditional mechanical friction-based damping mechanisms with an eddy current damping mechanism based on electromagnetic induction. When the mass block moves relative to the stator, copper sheets cut magnetic induction lines to generate eddy currents that produce damping force opposing the motion. This non-contact energy dissipation mode converts mechanical energy into electrical energy and then into thermal energy, achieving high damping energy consumption with no friction wear and simplified maintenance
Solution Approach 2:
The patent changes the damping mechanism from mechanical friction to electromagnetic eddy current by altering the physical principle of energy dissipation. The eddy current damping force can be adjusted by changing parameters such as magnetic field strength, copper sheet properties, and relative motion speed, enabling high and adjustable damping energy consumption while maintaining structural simplicity
3Loss of energy
If the damper components undergo large deformation during vibration, then the vibration absorption capacity is improved, but the component damage and repair cost increase
Solution Approach 1:
The patent utilizes the phase transition characteristics of shape memory alloy, which exhibits significant shape memory effect and phase transition superelasticity. When the damper components undergo large deformation during vibration, the shape memory alloy can recover up to 6%-8% strain through phase transition, enabling the structure to absorb large amounts of vibration energy while the material automatically returns to its original shape without permanent damage, significantly reducing repair costs
Solution Approach 2:
The patent changes the material properties by using shape memory alloy instead of conventional materials. This material has better fatigue resistance performance and can undergo large reversible deformations (6%-8% recoverable strain) through phase transitions. The damper based on shape memory alloy automatically recovers after deformation and has higher damping energy consumption capability, effectively reducing structural damage under earthquake and wind vibration effects
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 self-resetting tuned mass damper achieves enhanced vibration reduction efficiency with automatic resetting and low maintenance costs, utilizing gear amplification and shape memory alloy elongation to increase energy consumption, providing a stable and efficient vibration reduction effect.
Implementation Method 1
Eddy current damping technology is based on the law of electromagnetic induction to convert mechanical energy of object motion into electrical energy in a conductor plate, and then convert the electrical energy into thermal energy through the thermal resistance effect of the conductor plate to dissipate the vibrational energy of a system
Implementation Method 2
After the conductor plate moves in a magnetic field and generates an eddy current
Implementation Method 3
Shape memory alloy is a novel functional material with many special mechanical properties, including significant shape memory effect, phase transition superelasticity and high damping characteristics
Implementation Method 4
phase transition superelasticity and high damping characteristics
Data Source
AI summary
A self-resetting tuned mass damper is based on eddy current and shape memory alloy technology. The self-resetting tuned mass damper comprises a hollow box, a cover plate, a bolt, a mass block, gears a, gears b, gears c, copper sheets, permanent magnet groups, partition boards, balls, pins, levers, shape memory alloys, rotating shafts a, rotating shafts b, a supporting plate and rotating shafts c. The movement of the mass block causes the copper sheets to rotate and generate eddy current for energy consumption. The copper sheets are rotated and amplified by adjusting the sizes of the gears. The displacement of a small mass block can cause rotation of the copper sheets by a large angle, which greatly increases energy consumption efficiency. The elongation of the shape memory alloys is amplified by adjusting the ratio of long and short force arms of the levers.