Dynamic Vibration Absorber Structure for Multidirectional Tuning
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Solution Overview
Problem
Existing dynamic vibration absorbers are complex to manufacture and tune, and they require a wide installation space to absorb multidirectional vibrations, necessitating multiple absorbers for different vibration directions.
Innovation Solution
A dynamic vibration absorber design comprising a first and second support part with a gap in between, and at least one vibration absorber module with a movable mass connected to cylindrical portions made of different materials, allowing for adjustable natural frequencies and reduced installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple dynamic vibration absorbers are used to absorb multidirectional vibrations, then the vibration absorption capability is improved, but the installation space requirement increases
Solution Approach 1:
The patent combines multiple vibration absorption functions into a single integrated device. The first and second dynamic vibration absorbers are mounted on the same support structure, sharing common components such as the support plate, mounting brackets, and adjustment mechanisms. This merging allows the device to absorb vibrations in multiple directions simultaneously while occupying minimal installation space.
Solution Approach 2:
The support structure serves multiple functions: it provides mechanical support for both dynamic vibration absorbers, enables adjustment of their positions and orientations, and facilitates tuning of their natural frequencies. The adjustable design allows the same structure to adapt to different vibration absorption requirements, making it a universal solution for multidirectional vibration control.
2Adaptability or versatility
If complex dynamic vibration absorbers are designed to absorb multidirectional vibrations, then the vibration absorption capability is improved, but the manufacturing and tuning complexity increases
Solution Approach 1:
The device is segmented into independent modular units - the first and second dynamic vibration absorbers are separate, self-contained modules that can be manufactured independently using standard processes. Each absorber consists of discrete components (mass, spring, damper, mounting brackets) that can be produced through conventional manufacturing methods, reducing overall manufacturing complexity.
Solution Approach 2:
The device incorporates adjustable and movable elements that allow dynamic configuration. The positions of the dynamic vibration absorbers on the support plate can be adjusted, and their orientations can be changed to match different vibration patterns. This dynamic adaptability enables the same simple structure to handle multiple vibration scenarios without requiring complex fixed designs.
3Measurement precision
If dynamic vibration absorbers are designed for specific frequencies, then the vibration absorption precision is improved, but the adaptability to different frequencies decreases
Solution Approach 1:
The natural frequencies of the dynamic vibration absorbers can be adjusted by changing physical parameters such as the mass of the oscillating weights or the stiffness of the springs. This allows the device to be tuned to different target frequencies while maintaining precise absorption at each tuned frequency. The adjustable parameters enable the same hardware to achieve high precision across multiple frequency ranges.
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 proposed dynamic vibration absorber effectively reduces vibrations in multiple directions using a compact design, simplifying manufacturing and tuning processes while minimizing space requirements.
Implementation Method 1
uses the inertia force of the mass M in order to reduce the vibration
Implementation Method 2
reduces the vibration in question by use of vibrating with an opposite phase to the vibration in question
Implementation Method 3
a spring and a mass having a characteristic frequency which is the same as the frequency of a vibration in question
Implementation Method 4
a first damping layer inserted between the first cylindrical portion and the first movable mass, and a second damping layer inserted between the second cylindrical portion and the first movable mass
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The dynamic vibration absorber (7) comprises a first support part (8), a second support part (9) separated from the first support part by a first gap, and at least a first vibration absorber module (10), the first vibration absorber module (10) comprising a first surface (8a) of the first support part, a first surface (9a) of the second support part, and a first vibration absorber cylinder (13) connecting the first surface of the first support part and the first surface of the second support part, the first vibration absorber cylinder comprising a first cylindrical portion (13a) and at least a first movable mass (13c), the first movable mass being connected to the first cylindrical portion and being configured to vibrate at a predetermined frequency.