Composite TLD-TMD Damper for Steel Platform Vibration Control
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Solution Overview
Problem
Construction steel platforms face significant challenges during earthquakes and strong winds due to their large rigidity and lack of effective damping measures, leading to potential structural damage and safety risks for workers, as current damping technologies are not adequately developed for construction environments.
Innovation Solution
A composite tuned damping system combining a tuned liquid damper (TLD) and a tuned mass damper (TMD) is used, where the TLD and TMD overlap to form a composite damper, with adjustable partition plates and variable stiffness springs, allowing flexible combination in series or parallel to effectively reduce vibrations under wind and earthquake loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional TLD or TMD is used alone, then the damping effect is provided, but the damping performance is insufficient and stability is poor under large external excitations
Solution Approach 1:
The patent combines a tuned liquid damper (TLD) and a tuned mass damper (TMD) into a composite damper system. The TLD uses liquid sloshing to dissipate energy, while the TMD uses a mass-spring system with friction sliders. This merging of two different damping mechanisms creates a composite system that leverages the advantages of both approaches, achieving superior damping performance and stability under large external excitations compared to either device alone.
Solution Approach 2:
The composite damper system integrates different physical mechanisms (liquid damping and solid mass-spring damping) into a unified structure. The TLD portion utilizes fluid dynamics while the TMD portion utilizes mechanical friction and elasticity, creating a composite damping system that handles a broader range of vibration frequencies and amplitudes more effectively.
2Object-affected harmful factors
If the TLD water tank is subjected to large external excitation, then the liquid sloshes violently affecting structure function, but adding partition plates increases device complexity
Solution Approach 1:
The patent introduces partition plates within the TLD water tank to divide the liquid space into separate compartments. This segmentation prevents large-scale liquid sloshing by confining the liquid movement to smaller sections, thereby reducing the harmful effects of violent sloshing on the structure while maintaining the damping function.
3Adaptability or versatility
If the TMD spring stiffness is fixed, then the device is simple, but it cannot adapt to varying natural vibration frequencies of the structure
Solution Approach 1:
The patent employs friction sliders on the TMD springs that can move along the spring axis. These sliders provide a mechanism for dynamically adjusting the effective spring stiffness by changing the friction contact points. This allows the TMD to adapt its natural frequency to match the structure's natural vibration frequency, enhancing frequency adaptation capability while maintaining relative structural simplicity.
4Object-affected harmful factors
If the TLD partition plate hole diameter is reduced, then liquid sloshing is suppressed, but the damping force is reduced
Solution Approach 1:
The patent optimizes the hole diameter of the partition plates in the TLD to a specific range (1/20-1/30 of the tank width) to achieve the best balance. This parameter optimization allows the system to suppress liquid sloshing effectively while maintaining sufficient damping force, as the hole size controls both the liquid flow resistance and the sloshing amplitude.
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 system significantly reduces vibration responses of the steel platform, enhancing safety and comfort by improving damping performance and stability, and allowing for flexible adaptation to varying loads, thus minimizing structural damage and casualties.
Implementation Method 1
uses inertial force and viscidity energy dissipation of a liquid in a fixed container on the structures to reduce vibration response of the structures
Implementation Method 2
uses inertial force and viscidity energy dissipation of a liquid in a fixed container on the structures to reduce vibration response of the structures
Implementation Method 3
The TMD uses a small mass spring system attached to a main structure to absorb vibration energy of the main structure, so as to achieve damping
Implementation Method 4
a friction support comprising a sliding block and a support plate, wherein the sliding block can slide along the support plate
Data Source
AI summary
A construction steel platform system using a tuned liquid damper (TLD) and a tuned mass damper (TMD) for composite tuned damping is provided. According to the construction steel platform system using a TLD and a TMD for composite tuned damping, a composite damper is composed of the TLD and the TMD overlapping each other, and a construction steel platform is placed above the double dampers. By adjusting a hole diameter of a partition plate in the TLD, a liquid level in a water tank, a stiffness of a spring at an edge of a friction support and mass of materials of a top of the steel platform, the whole steel platform system can achieve composite tuned damping. The TLD and the TMD can be flexibly combined in series or in parallel according to requirements of actual wind and earthquake loads.