Eddy Current Tuned Mass Damper for Multi-Directional Vibration
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Solution Overview
Problem
Traditional Tuned Mass Dampers (TMDs) are limited to controlling vibrations in a single direction, making them inadequate for multi-dimensional structural vibration control, which increases costs and complexity due to the need for multiple dampers along main axes.
Innovation Solution
A multi-dimensional eddy current tuned mass damper is developed by integrating eddy current damping technology with orthogonal bidirectional mass-stiffness-damping elements and torsional stiffness-damping elements, utilizing hollow cylinders, rolling balls, permanent magnets, and copper rings to control both horizontal and torsional vibrations within a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional TMD is used to control vibration in a certain direction, then the vibration control effectiveness in that direction is improved, but the device cannot control vibrations in multiple directions, requiring multiple dampers to be arranged along main axes, which increases cost and complexity
Solution Approach 1:
The patent combines multiple vibration control functions (bidirectional horizontal control and torsional control) into a single integrated damper device. The inner hollow cylinder can move horizontally in two directions and rotate torsionally, while the outer hollow cylinder provides structural support and additional damping, merging what would traditionally require multiple separate TMDs into one unified system.
Solution Approach 2:
The damper device is designed with multi-functional capability to control vibrations in multiple directions simultaneously. The inner hollow cylinder serves multiple purposes: it acts as a mass element for horizontal vibration control, provides torsional inertia for rotational control, and houses the eddy current damping mechanism. This universal design allows one device to replace multiple specialized dampers.
2Reliability
If multiple dampers are arranged along main axes to ensure reliability of structural vibration control, then the vibration control coverage is improved, but the cost of structural vibration control is greatly increased
Solution Approach 1:
The patent merges the functionality of multiple dampers into a single integrated device. By combining bidirectional horizontal mass-spring-damper elements and torsional mass-spring-damper elements into one unit, the design reduces the quantity of dampers needed from multiple separate units to one multi-functional damper, thereby reducing material costs, installation costs, and maintenance costs.
Solution Approach 2:
The multi-functional damper provides universal vibration control capability across multiple directions and modes, replacing the need for multiple specialized dampers. This universality reduces the overall quantity of vibration control devices required in the structure, leading to cost savings in manufacturing, installation, and long-term maintenance.
3Reliability
If eddy current damping technology is used, then the durability and ease of damping adjustment are improved, but the device complexity increases due to the integration of electromagnetic components
Solution Approach 1:
The patent replaces traditional mechanical damping mechanisms (such as friction dampers or viscous fluid dampers) with eddy current damping technology. The eddy current damper uses electromagnetic induction to generate damping forces without mechanical contact, eliminating wear and tear associated with mechanical components. This substitution improves durability and allows for easy adjustment of damping characteristics by changing magnetic field strength or conductor properties.
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 multi-dimensional eddy current tuned mass damper effectively reduces vibrations in multiple directions, allowing for adjustable parameters, long-term stability, and reduced magnetic leakage, enhancing efficiency and simplicity in structural vibration control.
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, the eddy current will interact with the original magnetic field to generate a damping force that hinders the relative motion of the conductor plate and the magnetic field
Implementation Method 3
rolling balls a 6 are installed in the ball grooves a 19, and the inner hollow cylinder 3 is rotated in the outer hollow cylinder 1 through the rolling balls a 6
Implementation Method 4
tension springs 13 and torsion springs 15
Implementation Method 5
torsional stiffness element is composed of the torsion springs 15 which are respectively fixed between the inner cover plate 18 and the outer cover plate 17
Data Source
AI summary
The present invention discloses a multi-dimensional eddy current tuned mass damper, which belongs to the technical field of structural vibration control. A main body of the multi-dimensional eddy current tuned mass damper is composed of two hollow cylinders, wherein an inner hollow cylinder is located in an outer hollow cylinder, ball grooves are formed in the opposite upper and lower walls of the inner and outer hollow cylinders, rolling balls are installed in the ball grooves, and the inner hollow cylinder is rotated in the outer hollow cylinder through the rolling balls; the inner hollow cylinder is provided with an inner cover plate, and the outer hollow cylinder is provided with an outer cover plate, forming a relatively closed box body structure; an orthogonal bidirectional mass element, a stiffness element and an eddy current damping element are arranged in the inner hollow cylinder, and a torsional stiffness element and an eddy current damping element are arranged between the inner hollow cylinder and the outer hollow cylinder. The multi-dimensional eddy current tuned mass damper of the present invention is not only convenient to adjust in terms of mass, stiffness and damping parameters, but also has regular and beautiful appearance, simple structure, and very simple connection with a main structure.