Active Vibration Isolation System Structural Dynamics
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Solution Overview
Problem
Existing active vibration isolation systems fail to account for structural vibrations of the mass to be isolated, leading to increased or unaddressed natural frequency vibrations, as they treat the mass as a rigid body, which limits their effectiveness in reducing vibrations.
Innovation Solution
An active vibration isolation system that includes sensors to detect both position changes and structural vibrations, allowing for the calculation of compensation signals to be added to the control of actuators, which counteract both mechanical decoupling and structural vibrations, using non-contact sensors and actuators that engage without contact with the mass to be isolated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the mass to be isolated is regarded as a rigid body in the control model, then the control system is simpler to implement, but structural vibrations of the mass cannot be taken into account and may even be increased
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static rigid body model to a dynamic model that accounts for structural vibrations. The control model now includes vibrational modes of the mass, allowing the system to adapt its control strategy based on the actual dynamic behavior of the structure, thereby reducing vibrations without excessive complexity
Solution Approach 2:
The patent implements feedback by using sensors to detect structural vibrations and feeding this information back to the control system. The control model processes this feedback to generate compensation signals that actively counteract the detected vibrations, creating a closed-loop system that continuously optimizes vibration isolation
2Manufacturing precision
If additional sensors are added to detect structural vibrations, then vibration isolation precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the control system to handle multiple types of vibration data from different sensors through a unified control model. The same control architecture processes both position data from primary sensors and vibration data from additional sensors, eliminating the need for separate processing systems and minimizing additional complexity
Solution Approach 2:
The control model serves as an intermediary that integrates information from multiple sensor types. It receives raw data from various sensors, processes this information through the dynamic model, and generates coordinated compensation signals, thereby managing the complexity of multiple sensors through a centralized processing layer
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 system achieves significant vibration attenuation, with more than 3 dB at 5 Hz and more than 10 dB at 15 Hz, while maintaining high load capacity and not requiring additional hardware, allowing for easy retrofitting to existing systems.
Implementation Method 1
at least one sensor to detect changes in position, in particular vibrations of the mass to be isolated
Implementation Method 2
A change in position, in particular a vibration of the mass to be isolated, is counteracted via an actuator
Data Source
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AI summary
The invention relates to an active vibration isolation system which uses a sensor to detect the structural vibrations of the mass to be isolated and also takes these disturbances into account.