Double Pendulum Damper Assembly for Compact Vibration Damping
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Solution Overview
Problem
Existing absorber arrangements for tall, slender structures like wind turbine towers require significant space to effectively dampen low-frequency vibrations, which is a challenge for compact installations.
Innovation Solution
A double pendulum absorber arrangement with a friction element held transversely to gravity, interacting with absorber masses, and a non-rigid coupling allowing variable distance between masses, along with adjustable spring-loaded friction elements to optimize damping and natural frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pendulum arrangement is used for vibration damping, then effective damping is achieved, but the installation space requirement becomes large
Solution Approach 1:
The single pendulum is segmented into a double pendulum system with two separate damper masses connected by a coupling arrangement. This segmentation allows the system to achieve the same damping effectiveness with a significantly reduced installation height, as the vertical distance between the two masses can be optimized independently of the total pendulum length.
Solution Approach 2:
The double pendulum arrangement nests the second damper mass within the oscillation path of the first damper mass. The coupling arrangement connects the two masses such that they oscillate together, effectively nesting their functions within a compact vertical space while maintaining the required damping performance.
2Stability of the object's composition
If a rigid coupling is used between damper masses, then synchronized oscillation is achieved, but the system loses adaptability to varying conditions
Solution Approach 1:
The coupling arrangement transitions from a static rigid connection to a dynamic flexible connection that allows variable distance between the two damper masses. This dynamic coupling maintains synchronized oscillation through the oscillation range while allowing adjustment of the distance between masses, enabling adaptation to different operating conditions and frequency requirements.
Solution Approach 2:
The system allows change of the distance parameter between the two damper masses while maintaining synchronized oscillation. By adjusting this distance parameter, the natural frequency and damping characteristics can be optimized for different wind conditions and tower vibration modes, providing adaptability without sacrificing oscillation synchronization.
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
Significantly reduces installation space while maintaining effective vibration damping, with adjustable damping and natural frequency to suit varying conditions, ensuring efficient energy dissipation through frictional forces that increase with oscillation amplitude.
Implementation Method 1
During the oscillation of the damper mass, the damper mass rubs against the friction element, extracting energy from the oscillation and converting it into heat.
Implementation Method 2
the at least one friction element is biased by a spring arrangement that acts towards the at least one damping mass. The spring arrangement thus presses the friction element against the damping mass.
Implementation Method 3
A pendulum damper assembly is suspended from a supporting structure. The pendulum damper assembly comprises a first damper mass suspended at a position higher in the direction of gravity
Data Source
Figure 1
AI summary
A damper arrangement (1) with a double pendulum arrangement is described, comprising a first damper mass (2) suspended at a position (7, 8) located higher in the direction of gravity, and a second damper mass (3) supported at a position (12, 13) located lower in the direction of gravity and connected to the first damper mass (2) by a coupling arrangement (4), and a damper arrangement that interacts with at least one of the two damper masses (2, 3). Such a damper arrangement is designed to be simple and compact. For this purpose, the damper arrangement includes at least one friction element (17, 23) held transversely to the direction of gravity by a retaining arrangement (20, 26), which bears against at least one of the damper masses (2, 3).