Self-Tuning Tunable Mass Damper with Adjustable Flexures
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Solution Overview
Problem
The existing tuned mass dampers (TMDs) require a tedious tuning process to determine the correct natural frequency and damping values for optimal performance, which is time-consuming and requires multiple iterations, making it desirable to have a self-tuning mechanism to reduce dynamic response in aerospace structures.
Innovation Solution
A self-tuning TMD employing a voice coil and magnet combination as both an actuator and a lossy element, with adjustable flexures and a control system to automatically adjust the frequency and damping of the TMD by changing the effective length of the flexures and resistance across the voice coil, allowing for real-time optimization of the damping response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional TMD tuning methods using finite element models and iterative adjustments are employed, then accurate frequency and damping values can be determined, but the tuning process becomes tedious and time-consuming
Solution Approach 1:
The TMD system performs self-tuning by automatically adjusting its own parameters. The control system monitors the host structure's vibration and autonomously modifies the TMD's natural frequency and damping coefficient through actuator control, eliminating the need for manual iterative tuning while achieving optimal performance
Solution Approach 2:
The system continuously monitors the host structure's dynamic response and uses this feedback to adjust the TMD parameters in real-time. Sensors detect vibration characteristics, and the control system processes this information to modify the TMD's frequency and damping, creating a closed-loop self-tuning mechanism
2Adaptability or versatility
If fixed parameter TMDs are used, then the device structure remains simple, but the TMD cannot adapt to varying dynamic conditions of the host structure
Solution Approach 1:
The TMD transitions from a static fixed-parameter system to a dynamic adjustable system. The natural frequency and damping coefficient are made variable through controllable actuators that modify the TMD's mechanical properties in real-time, allowing adaptation to changing vibration conditions while maintaining a relatively compact structure
Solution Approach 2:
The voice coil assembly serves multiple functions: it acts as both the actuator for adjusting TMD parameters and the lossy element for providing damping. This multi-functionality reduces overall system complexity while enabling adaptive behavior across different operating conditions
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 solution enables automatic tuning of the TMD, reducing the time and effort required for installation while achieving better performance in damping dynamic responses by dynamically adjusting the frequency and damping to minimize structural vibrations.
Implementation Method 1
A self-tuning TMD employing a voice coil / magnet combination as both an actuator and a lossy element
Implementation Method 2
employing a voice coil / magnet combination as both an actuator and a lossy element for measuring and adjusting the TMD and structural response
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A tunable mass damper 400 incorporates a frame 14 and a voice coil 10 supported in the frame 14. A magnet 16 concentric with the voice coil 10 is movable relative to the housing via the voice coil 10. A plurality of flexures 18a and 18b having a first end extending from the magnet 16 and an arm 19 releasably coupled to the frame 14 are adjustable to an effective length for a desired frequency of reciprocation of the magnet 16.