Adaptive Tuned Vibration Absorber With Movable Mass Control
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Solution Overview
Problem
Existing tuned vibration absorbers require multiple sensors and complex setups, leading to increased costs and potential sensor fatigue, and often require precise tuning for specific frequencies, limiting their adaptability to varying vibration levels.
Innovation Solution
An adaptive tuned vibration absorber system that uses a single sensor to detect vibrations and adjusts a mass on a beam to optimal positions based on detected frequencies, eliminating the need for multiple sensors and allowing for adaptive frequency response without exact tuning, using a processor, motor controller, and actuator to adjust the mass position effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to detect vibrations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sensing functions into a single sensor system. The single sensor captures vibration signals across multiple frequencies, and the processor analyzes these signals to extract information about different vibration modes, effectively merging what would traditionally require multiple sensors into one integrated system.
Solution Approach 2:
The single sensor is designed to perform multiple measurement functions simultaneously. It detects vibrations across a broad frequency range and provides data that the processor uses to identify multiple vibration modes and determine optimal mass positions for attenuating different frequencies, making the sensor universal rather than specialized for a single function.
2Reliability
If precise tuning is performed for specific frequencies, then vibration attenuation effectiveness is improved, but adaptability to varying vibration levels deteriorates
Solution Approach 1:
The system transitions from static, pre-tuned vibration absorbers to a dynamic system that continuously adapts. The processor dynamically identifies the current vibration frequency and mode in real-time, and the actuator dynamically adjusts the mass position on the beam to match the optimal position for the detected frequency, enabling the system to adapt to varying vibration conditions.
Solution Approach 2:
The system implements a feedback loop where the single sensor continuously monitors vibration characteristics, the processor analyzes the feedback signals to identify current vibration modes and frequencies, and the actuator adjusts the mass position based on this feedback. This closed-loop feedback mechanism enables both precise attenuation for the current frequency and adaptability to frequency changes.
3Reliability
If multiple sensors and complex setups are used, then measurement reliability is improved, but system cost increases
Solution Approach 1:
The patent merges multiple sensing, processing, and actuation functions into a single integrated system. One sensor replaces multiple sensors, one processor handles all signal analysis and control decisions, and one actuator performs all mass positioning adjustments, significantly reducing system complexity and cost while maintaining measurement reliability through sophisticated signal processing.
Solution Approach 2:
The system replaces complex mechanical arrangements of multiple sensors and tuned absorbers with an electronically controlled system. The processor uses signal processing algorithms to extract vibration mode information from a single sensor's output, substituting what would traditionally require multiple mechanical sensors with electronic analysis and control.
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 reduces system complexity and cost, enhances adaptability to different vibration frequencies, and continuously improves efficiency by learning optimal mass positions for vibration attenuation, allowing for effective vibration reduction across various frequencies without the need for precise tuning.
Implementation Method 1
detecting a vibration of a structure
Implementation Method 2
tuned vibration absorber may attenuate vibration levels experienced by, for example, a rotorcraft, at a specific frequency
Implementation Method 3
The motion of the TVA may counteract a vibration input by applying forces out of phase with the vibration input
Data Source
AI summary
A system may detect a vibration being applied to a tuned vibration absorber. The tuned vibration absorber may include a beam, a mass, springs, a sensor, and an actuator. The mass may be disposed on the beam at a current position. The actuator may be configured to adjust a position of the mass on the beam. The system may identify a target position of the mass on the beam based on the detected vibration. The system may generate a drive signal, based on the target position, to control the actuator to adjust the position of the mass on the beam. The system may control the actuator to adjust the position of the mass from the current position on the beam to the target position on the beam to attenuate the vibration.