Segmented Damping Member Structure for High-Rigidity Vibration Control
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Solution Overview
Problem
Existing vibration damping structures face challenges in achieving high vibration damping effects without reducing the rigidity of structures, as reducing rigidity can compromise the integrity of vehicle bodies and buildings.
Innovation Solution
A vibration damping structure is designed with a second member having joined and unjoined portions, where the second member is formed to have a higher damping coefficient than the first member and a resonance frequency matching or closely aligned with the first member, allowing for efficient energy absorption without constraining resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the rigidity of the structure itself is reduced to enhance vibration damping, then the vibration damping effect is improved, but the structural integrity and rigidity are compromised
Solution Approach 1:
The second member is segmented into multiple joined portions and multiple unjoined portions, creating a distributed system where vibration damping occurs in the unjoined portions while structural support is provided by the joined portions. This segmentation allows the structure to achieve high damping without compromising overall rigidity.
Solution Approach 2:
Different portions of the second member have different properties: the unjoined portions have high damping properties for vibration absorption, while the joined portions provide structural connection and rigidity. This local differentiation allows simultaneous achievement of vibration damping and structural integrity.
2Strength
If the second member is fully joined to the first member to ensure structural integrity, then the structural rigidity is maintained, but the vibration damping effect is reduced due to constrained resonance
Solution Approach 1:
The second member is divided into joined and unjoined portions, allowing it to simultaneously maintain structural connection and enable free resonance for vibration damping. The unjoined portions can resonate without constraint from the first member, enhancing energy dissipation.
Solution Approach 2:
The unjoined portions of the second member are designed to resonate freely at frequencies matching the first member's resonance frequency. This resonance capability allows the unjoined portions to effectively absorb and dissipate vibration energy from the first member through the joined portions.
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
This approach enables a high vibration damping effect without reducing the rigidity of the structure, effectively storing strain energy in the second member and enhancing energy absorption, while maintaining structural integrity.
Implementation Method 1
the unjoined portion of the second member resonates without being constrained by the first member
Implementation Method 2
vibration is input from the first member to the second member via the joined portion
Implementation Method 3
the second member is formed such that the second member is higher in damping than the first member
Data Source
AI summary
A vibration damping structure includes a panel which is a structure and a damping member joined to the panel. The damping member has a plurality of joined portions joined to a mating surface of the panel through respective joined surfaces in the X direction, and a plurality of spacing portions recessed toward the side opposite to the panel in the Z direction between adjacent joined portions. The damping member is formed such that the damping member is higher in damping than the panel and a resonance frequency of the damping member is formed such that it is substantially the same as a primary resonance frequency of the panel.