Dynamic Damper Assembly with Multi-Mass Segmentation
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Solution Overview
Problem
Conventional dynamic dampers mounted on vehicle drive shafts are ineffective in attenuating noise and vibration across multiple frequency bands, leading to secondary anti-resonance issues, which increase weight and cost when multiple dampers are used, and are temperature-sensitive, causing frequency shifts at low temperatures.
Innovation Solution
A dynamic damper assembly featuring multiple heavy bodies with varying masses arranged at intervals on the drive shaft, surrounded by an elastic body, with slit holes and connection portions to eliminate rotating unbalance and achieve multi-frequency attenuation, thereby controlling both primary and secondary bending modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If two dynamic dampers are mounted to reduce secondary anti-resonance, then the frequency response improves, but weight and cost increase
Solution Approach 1:
Multiple heavy bodies with different masses are integrated into a single dynamic damper assembly rather than using separate dampers. The first, second, and third heavy bodies are all mounted on the same drive shaft within one assembly, achieving multi-frequency attenuation while avoiding the weight and cost penalties of multiple separate damper units.
2Object-affected harmful factors
If materials with large loss factor are used to reduce anti-resonance, then attenuation improves, but frequency offset occurs in low-temperature regions
Solution Approach 1:
Instead of relying on a single material's loss factor, the solution segments the damping function across multiple heavy bodies with different masses positioned at different radial distances. This mechanical segmentation allows independent optimization of each heavy body's mass and position to target specific frequency bands without relying on temperature-sensitive material properties.
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 solution effectively reduces noise and vibration across multiple frequency bands, eliminates secondary anti-resonance, and decreases weight and cost by using a single damper, while maintaining performance across varying temperatures.
Implementation Method 1
an elastic body which is formed to surround each of the heavy bodies and fix the heavy body to the drive shaft
Implementation Method 2
A resultant of centrifugal forces of the heavy bodies may be set to be '0'
Implementation Method 3
a dynamic damper is mounted to the drive shaft... when the RH shaft resonates in the excitation range of an engine
Data Source
AI summary
A dynamic damper assembly may include a plurality of bodies arranged at predetermined intervals on an outer peripheral surface of a drive shaft, and an elastic body formed to surround each of the bodies and fixing each body to the drive shaft.