Vibration Absorber With Rotating Flywheel for Low-Frequency Damping
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Solution Overview
Problem
Existing vibration absorbers for tall and slim structures like wind turbines face challenges in efficiently damping low-frequency vibrations, particularly below 1 Hz, due to space constraints and the need for complex and difficult frequency adjustments, especially when dealing with heavy absorber masses and varied operational conditions.
Innovation Solution
A vibration absorber system featuring a concave, circular running device with a rotating flywheel mass that can be adjusted in size and position to change the resonant frequency, allowing for precise tuning and adaptation to different vibration conditions, using a combination of wheels, rollers, and magnetic systems for efficient torque transmission and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heavy absorber mass is used to dampen low-frequency vibrations, then the damping effectiveness is improved, but the space required and device complexity increase
Solution Approach 1:
The patent applies the dynamics principle by introducing a rotating mass component that can change its moment of inertia during operation. The rotating mass is connected to the absorber mass and can rotate about an axis perpendicular to the movement direction, allowing dynamic adjustment of the system's resonant frequency without changing the physical size of the absorber assembly.
Solution Approach 2:
The patent implements parameter changes by varying the moment of inertia of the rotating mass component. By adjusting the distribution of mass in the rotating component (changing its radius of gyration), the system can tune its resonant frequency to match different vibration frequencies, thereby maintaining effective damping with a compact design.
2Adaptability or versatility
If the resonant frequency is adjusted to match different vibration frequencies, then the adaptability is improved, but the device complexity and difficulty of adjustment increase
Solution Approach 1:
The rotating mass component provides a dynamic means of frequency adjustment. By rotating the mass to different positions or changing its rotational speed, the moment of inertia varies, thereby adjusting the resonant frequency of the absorber to match different vibration frequencies without requiring complex mechanical reconfiguration.
Solution Approach 2:
The system can automatically adjust its frequency characteristics through the natural rotation of the rotating mass component. The rotation may be driven by the vibration forces themselves, allowing the absorber to self-tune to the dominant vibration frequency without external control mechanisms.
3Reliability
If a large absorber mass is used, then the damping effect is improved, but the weight and space requirements worsen
Solution Approach 1:
The rotating mass component adds dynamic characteristics to the absorber system. The rotation of this mass creates additional inertial effects that enhance the damping capability without requiring a proportional increase in the main absorber mass, thereby improving the damping effect while controlling the overall weight.
Solution Approach 2:
The patent employs a composite mass system consisting of the absorber mass and the rotating mass component. This composite structure leverages the combined inertial properties of both masses, where the rotating component contributes to the damping effect through its rotational inertia, allowing for more efficient use of total mass.
4Ease of operation
If frequency adjustment is made easier, then the ease of operation is improved, but the manufacturing precision and control accuracy may worsen
Solution Approach 1:
The rotating mass provides a continuous range of moment of inertia values through its rotation, enabling smooth and continuous frequency adjustment. This dynamic adjustment mechanism is easier to operate than discrete mechanical changes while maintaining sufficient precision through the continuous variability of the rotational parameter.
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 effectively dampens vibrations by allowing up to 30% frequency adjustment, reducing the required mass by a tenth while maintaining effective damping across various directions, making it suitable for wind turbines and similar structures with improved space efficiency and ease of installation.
Implementation Method 1
the at least one rotation mass component (1.6) has a variable rotating mass (1.6) which corresponds to 1%-30% of the absorber main mass (1.1), depending on the diameter of the rotating mass or on the diameter of the mass centre of gravity of the mass part
Implementation Method 2
the running gear (1) or the absorber main mass (1.1) can be moved and displaced out of a central position or vertex position on the concave side of this running device by means of wheels or rollers or in a non-contact manner in accordance with the vibration forces initiating the movements
Data Source
AI summary
A novel vibration absorber for damping vibrations of a building or a machine installation having an inherent frequency of preferably below 1 Hz, preferably below 0.5 Hz, in particular, <0.25 Hz, as may occur, for example, in wind turbines or also other tall slim buildings or installations. The vibration absorber which, besides a main mass which is fixed per se and is moved along a track analogous or similar to a pendulum mass, has a substantially smaller, variably adjustable rotating flywheel mass, which can be moved with the main mass on the track thereof and with the aid of which the frequency of the absorber can be finely adjusted or adapted.