Frequency Tuned Damper With Cavity Elastic Element
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Solution Overview
Problem
Existing frequency tuned dampers are limited in their ability to effectively address vibrations of various frequencies across multiple dimensions, particularly low and higher frequency vibrations.
Innovation Solution
The damper features a unique elastic element with a wide and narrow portion connected by a transition portion, allowing the narrow portion to be partially inserted into the cavity of the wide portion, providing low stiffness for low-frequency vibrations and adaptable properties for different frequencies through circular symmetry or conical transition shapes, along with a tool-accessible cavity for mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the elastic element has a conventional uniform structure, then it provides sufficient stiffness for high-frequency vibrations, but it cannot effectively dampen low-frequency vibrations
Solution Approach 1:
The elastic element is divided into distinct wide and narrow portions with different cross-sectional areas, allowing each portion to contribute differently to the overall stiffness characteristics and enable effective damping across a broader frequency range including low frequencies
Solution Approach 2:
Different portions of the elastic element have different local properties (cross-sectional area), with the narrow portion providing flexibility for low-frequency damping while the wide portion maintains structural integrity and high-frequency damping capability
2Adaptability or versatility
If the elastic element is made with complex transition portions for low-frequency damping, then low-frequency vibrations are effectively dampened, but the manufacturing complexity increases
Solution Approach 1:
The transition portion uses curved or conical surfaces to smoothly connect the wide and narrow portions, providing the necessary flexibility for low-frequency damping while maintaining a relatively simple and manufacturable geometry
Solution Approach 2:
The cross-sectional area of the elastic element is gradually changed along its length through the transition portion, creating a smooth gradient that reduces stress concentrations and simplifies manufacturing while achieving the desired low-frequency damping characteristics
3Reliability
If the elastic element has orientation-dependent properties for optimized damping, then damping performance is maximized in specific directions, but the mounting becomes more complex and orientation-critical
Solution Approach 1:
The elastic element features an asymmetric cross-sectional geometry with distinct wide and narrow portions that provide optimized damping performance while maintaining rotational symmetry about the longitudinal axis, allowing flexible mounting orientations
Solution Approach 2:
The elastic element is designed to provide effective damping across multiple orientations and vibration directions simultaneously, making it universally applicable regardless of mounting orientation and eliminating the need for precise alignment during installation
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
Enables effective damping of vibrations across multiple dimensions, including low and higher frequencies, with flexible mounting and orientation-independent performance, while maintaining structural integrity and noise reduction.
Implementation Method 1
at least one elastic element (7), which is adapted to connect the vibration body (5) to the surface (3) and together provide a spring-mass system
Implementation Method 2
the vibration body is caused to oscillate at the same frequency as the surface but out of phase with the latter, such that the vibration of the surface is substantially dampened
Data Source
Figure 1~2
Figure 3~4b
Figure 5~7b
AI summary
The present disclosure relates to a frequency tuned damper having a vibration body (19) and at least one elastic element (11, 13, 15, 17) which connects the vibration body to a surface (21), the vibrations of which is to be dampened. The elastic element has a wide portion (29) and a narrow portion (31) disposed at different locations on an axis (39) which is substantially parallel with the normal of the surface. The wider portion has a cavity (41), and the wide and narrow portions are inter-connected by a transition portion (43). The part of the narrow portion that is closest to the transition portion fits inside the cavity, as seen in the direction of the axis, such that the narrow portion can be pushed at least partly into the cavity, thereby flexing the transition portion.