Active Vibration Damper for Low Frequency Oscillating Structures
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Solution Overview
Problem
Existing vibration damping systems are ineffective in minimizing the oscillation amplitude of low-frequency oscillating structures with multiple mass-spring elements, particularly in applications like mobile X-ray scanners where vibrations can disrupt the accuracy of detectors.
Innovation Solution
An active vibration damper with a springless, rigidly connected absorber mass is used, driven by a control device that utilizes a movement sensor to generate opposing forces, directly transmitting inertial forces to the carrier, thereby damping vibrations without the need for spring-based absorbers, and employing multiple control loops to target specific frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive vibration absorber with spring connection is used, then the absorber can follow the movements of the oscillating part with delay and withdraw energy, but it is ineffective in minimizing oscillation amplitude of low-frequency structures with multiple mass-spring elements
Solution Approach 1:
The patent replaces the passive mechanical spring connection with an active electromechanical drive system. The drive unit (motor-driven) actively controls the absorber mass position based on feedback from sensors, substituting the automatic spring-based energy withdrawal mechanism with an electronically controlled force application system that can effectively dampen low-frequency oscillations in complex multi-mass-spring structures.
2Device complexity
If the absorber mass is rigidly connected to the drive and the drive is rigidly connected to the fastening device, then the degree of freedom is reduced and inertial forces are transmitted directly, but the system requires complex active control
Solution Approach 1:
The patent implements a feedback control system where sensors (accelerometers, gyroscopes) detect the oscillating part's movement, and the control unit processes this information to generate control signals that adjust the drive unit's output. This closed-loop feedback mechanism enables the rigidly connected absorber mass to actively counteract oscillations by applying precisely controlled inertial forces, resolving the contradiction between rigid connection simplicity and control complexity.
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 effectively minimizes vibration amplitudes across multiple frequency modes, particularly in low-frequency ranges, enhancing the stability and accuracy of oscillating systems like mobile X-ray scanners by directly addressing the inertial forces and using broadband feedback control.
Implementation Method 1
a movement of the mass relative to the fastening device causes an inertial force caused by the movement to be transmitted via the drive directly to the fastening device
Implementation Method 2
The control device includes a movement sensor, the control device being set up to control the drive as a function of the signals from the movement sensor
Implementation Method 3
the control device being set up to control the drive as a function of the signals from the movement sensor and in this way to dampen vibrations of the carrier
Data Source
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AI summary
An active vibration damper (1) for damping the vibration of a cantilevered section of a beam, wherein the vibration damper (1) has a mass (15), wherein the mass (15) is springlessly coupled via a drive (20), which is controlled by a control device of the vibration damper (1), to a fastening device for attaching the drive (20) to a beam to be damped, such that by a movement of the mass (15) relative to the fastening device an inertial force caused by the movement is transmitted directly to the fastening device via the drive (20), and wherein the control device comprises a motion sensor (19), and the control device is configured to control the drive (20) depending on the signals of the motion sensor (19).