Impulse Tuned Mass Damper for Tall Structure Assembly Vibration
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Solution Overview
Problem
Existing impulse dampers are not optimally effective in reducing large vibration amplitudes during the assembly or disassembly of tall, slim structures like wind turbines, particularly due to limited damping capacity and mobility issues.
Innovation Solution
A mobile impulse damper device with a star-shaped support structure, a movable mass, sliding/friction device, and stop elements that allow for effective impulse damping by preventing rotational movements and utilizing resilient or hydraulic elements for adjustable damping, ensuring strong damping effects and ease of handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional impulse damper is used, then the structure provides some damping effect, but the damping capacity is insufficient for large vibration amplitudes during assembly or disassembly
Solution Approach 1:
The damper mass is made movable relative to the support structure through sliding/friction devices, allowing it to dynamically respond to vibration amplitudes. The mass can move freely within certain limits to maximize damping effectiveness during large vibrations, then return to a neutral position when vibrations subside.
Solution Approach 2:
The damper is divided into separate functional components: a movable damper mass, a support structure with arms, sliding/friction devices for controlled movement, and stop elements for limiting displacement. This segmentation allows each component to be optimized independently for its specific function.
2Reliability
If the damper mass is made larger to increase damping capacity, then damping effectiveness improves, but mobility and ease of handling during assembly deteriorate
Solution Approach 1:
The damper is designed as a modular assembly of separate components (support structure, damper mass, sliding devices, stop elements) that can be independently handled and assembled. This allows the system to achieve high damping capacity through the combined mass of multiple components rather than requiring a single large, difficult-to-handle mass.
Solution Approach 2:
The movable damper mass design allows the damping system to be installed in a compact, manageable configuration that can be easily positioned and assembled, yet provides large effective mass for damping when in operation. The mass moves into position during vibrations rather than requiring permanent large-scale installation.
3Stability of the object's composition
If the damper is designed for permanent use, then structural stability improves, but adaptability to changing natural frequencies during assembly/disassembly deteriorates
Solution Approach 1:
The movable damper mass design inherently provides adaptability to changing frequencies. As the structure's natural frequency changes during assembly or disassembly, the damper mass automatically adjusts its movement characteristics and operating range, maintaining effective damping without requiring manual reconfiguration or permanent fixed installation.
4Reliability
If stop elements are added to prevent rotational movement, then damping effectiveness in tangential direction improves, but device complexity increases
Solution Approach 1:
The stop elements are implemented as discrete, simple components attached to the support arms rather than complex rotational constraints. This segmentation allows the system to achieve the necessary anti-rotation functionality through simple geometric arrangements of basic elements, minimizing added complexity while maintaining damping effectiveness.
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 impulse damper effectively reduces uncontrolled vibrations during construction or disassembly of wind turbines, providing strong damping and mobility, making it suitable for both temporary and permanent use, while preventing damage from excessive vibrations.
Implementation Method 1
at least one sliding/friction or rolling device (4) which is arranged and designed so as to allow relative movement between the support device (2) and the movable, vibratable mass (3)
Implementation Method 2
The stop elements can comprise purely resilient elements (7.1), which are designed, for example, as per se known layer elements made of resilient material and metal sheets (7.1.0)
Implementation Method 3
The stop elements can, however, also comprise resilient elements (7.2) which consist of corresponding layer elements (7.2.0) that are provided with hydraulic means (7.2.1) (7.2.2) (7.2.3) (7.2.4)
Implementation Method 4
The impulse damper according to the invention prevents or reduces uncontrolled vibrations, in particular large harmful vibration amplitudes, which occur more strongly in particular during the construction or disassembly of the structure
Data Source
AI summary
An impulse damper device, which is specifically provided for the construction or the dismantling of tall, slim constructions, in particular towers and preferably towers of wind turbines, in order to minimize or eliminate undesired vibration states, which often occur during the construction or taking apart and lead to large increases in the vibration amplitudes of the vibration system. The impulse tuned mass dampers are preferably provided for temporary mobile use, but, in principle, are also suitable for permanent use.