Adjustable Damper with Sliding Cantilevers for Frequency Matching
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Solution Overview
Problem
Conventional tuned mass dampers (TMDs) are ineffective when the natural vibration frequency does not match the vibration frequency of the main structure, as they can only exert damping effect when frequencies align, leading to reduced or failed vibration control.
Innovation Solution
An adjustable damper system with sliding members and cantilevers that adjust stiffness and natural frequency to match the main structure's vibration frequency, using motors to move slidable members along rails and cantilevers, allowing for independent adjustment of stiffness in multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional TMD with fixed stiffness is used, then the structure is simple and requires no power input, but the damping effect is lost when vibration frequency varies
Solution Approach 1:
The patent applies the dynamics principle by making the stiffness of the TMD adjustable through movable slidable members that can change the effective length of cantilevers. This allows the natural frequency of the TMD to be dynamically adjusted to match varying vibration frequencies of the main structure, resolving the contradiction between fixed simplicity and frequency adaptability.
Solution Approach 2:
The patent changes the physical parameter of stiffness by allowing slidable members to move along cantilevers, thereby altering the effective length and stiffness characteristics. This parameter change enables the TMD to adapt to different vibration frequencies while maintaining a relatively simple overall structure.
2Adaptability or versatility
If adjustable stiffness mechanism is added to TMD, then frequency matching capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the TMD into independent components: base, movable seat, slidable members, and cantilevers. Each component performs a specific function, and the modular design allows for independent adjustment of stiffness parameters without requiring complete system redesign, thus managing complexity while improving frequency matching capability.
3Reliability
If slidable members are made movable to adjust stiffness, then natural frequency can be adjusted to match main structure, but the mechanism requires additional components and control
Solution Approach 1:
The patent implements self-service by enabling the TMD to automatically adjust its own stiffness parameters through the movable slidable members in response to detected vibration frequencies. The system monitors its own performance and self-regulates to maintain optimal frequency matching, improving reliability while minimizing the need for external control intervention.
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 adjustable damper effectively suppresses multidirectional vibrations by automatically matching its natural frequency to the main structure's frequency, enhancing vibration control and tool lifespan by adapting to varying vibration frequencies.
Implementation Method 1
The first cantilever is fixed to a first connecting member and extending in the first direction... The first slidable member movably is disposed on the first cantilever so as to be moved close to or away from the first connecting member along the first cantilever
Implementation Method 2
capturing a vibration signal of the main structure by a vibration signal capturing unit of the adjustable damper
Data Source
AI summary
An adjustable damper includes a base, a first and second slidable members, a movable seat, a mass unit, and a first and second cantilevers. The first slidable member is slidably disposed on the base in a first direction. The movable seat is slidably disposed on the base in a second direction orthogonal to the first direction. The second slidable member is slidably disposed on the movable seat in the second direction. The mass unit is slidably disposed on the movable seat in the first direction. The first cantilever is fixed to a first connecting member. The first connecting member is connected to the movable seat. The first slidable member movably is disposed on the first cantilever. The second cantilever is fixed to a second connecting member. The second connecting member is connected to the mass unit. The second slidable member is movably disposed on the second cantilever.