Inertial Mass Amplification Tuned Mass Damper
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Solution Overview
Problem
Existing tuned mass dampers require large masses to achieve vibration reduction objectives, which is impractical due to installation space limitations and can adversely affect high flexible structures, making it difficult to achieve desired earthquake and wind resistance.
Innovation Solution
An inertial mass amplification type tuned mass damper with a novel structure using a hollow box, H-shaped mass block, gears, viscous dampers, and springs, where the radius ratio of gears amplifies inertial damping force, allowing for reduced mass while maintaining effective vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mass of the tuned mass damper is increased to achieve vibration reduction objectives, then the vibration reduction effect is improved, but the installation space requirement increases and the additional mass may adversely affect the structure
Solution Approach 1:
The patent changes the physical parameters of the system by introducing a gear transmission mechanism with a specific transmission ratio. This mechanical parameter change allows the damper to achieve amplified inertial force output without proportionally increasing the damper mass, thus resolving the contradiction between vibration reduction effectiveness and mass limitation
Solution Approach 2:
The gear transmission mechanism acts as an intermediary between the moving mass and the damping force generation system. By introducing this intermediate mechanical transmission device, the patent enables a small mass to generate a large inertial damping force through mechanical advantage, thereby achieving effective vibration reduction without requiring large damper mass
2Volume of moving object
If the mass of the damper is reduced to meet installation space limitations, then the installation feasibility is improved, but the vibration reduction effect deteriorates
Solution Approach 1:
The patent introduces a gear transmission ratio as a controllable parameter that decouples the relationship between damper mass and damping force magnitude. This parameter change enables the system to maintain effective vibration reduction with reduced mass by compensating through mechanical advantage in the gear transmission mechanism
3Strength
If the additional mass of the damper is reduced to avoid adverse structural effects, then the structural safety is improved, but the vibration reduction capability deteriorates
Solution Approach 1:
The patent changes the force generation mechanism by introducing gear transmission with a specific ratio. This parameter change allows the system to generate sufficient damping force with minimal additional mass, thereby maintaining both structural safety and vibration reduction capability
Solution Approach 2:
The gear transmission mechanism serves as an intermediary that amplifies the inertial force generated by the small damper mass. This intermediate mechanism enables the system to achieve adequate damping force without requiring large additional mass that would compromise structural safety
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 solution provides a significant vibration reduction effect with a smaller mass, avoiding adverse structural effects and optimizing space usage, thus enhancing the structure's earthquake and wind resistance performance.
Implementation Method 1
the ends of the viscous dampers 7 are installed on the inner wall of the hollow box 1 through the steel ring 6
Implementation Method 2
one outer side edge with the through hole in the rectangular frame 5 is provided with two springs 9, and the ends of the springs 9 are installed on an inner wall of the hollow box 1 through the steel ring 6
Implementation Method 3
two gears a 3 are arranged and are respectively engaged with the two tooth slots on the web plate of the H-shaped mass block 2; two gears b 4 are arranged, which are respectively engaged with the tooth slots on both sides of the rectangular frame 5
Implementation Method 4
a plurality of balls 11 are installed on the bottom of the H-shaped mass block 2
Data Source
AI summary
An inertial mass amplification type tuned mass damper is disclosed. The inertial mass amplification type tuned mass damper comprises a hollow box, an H-shaped mass block, gears a, gears b, a rectangular frame, a steel ring, viscous dampers, a steel sheet, springs, rotating shafts and balls. In the present invention, an inertial damping force is amplified by adjusting the radius ratio of the gears a and the gears b; and damping parameters can be conveniently changed by adjusting the mass of the mass block, the spring stiffness and the like. The present invention has the advantages that the design mass is small, which can avoid the adverse effects of excessive additional gravity on the structure and improve the performance of the structure. The present invention has reasonable design and small occupied space, can save more use area for buildings and can greatly improve the utilization efficiency of the buildings.