Active Vibration Control via Youla Parameter Adaptation
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Solution Overview
Problem
Industrial rotary machines generate vibrations that are transmitted to physical structures, causing mechanical perturbations due to unbalance, which existing passive methods fail to adequately isolate due to limitations in damping effectiveness.
Innovation Solution
An active control method using a control law consisting of a central corrector and a Youla parameter is implemented, where an actuator counteracts vibrations by generating control signals based on measurements from sensors, with the Youla parameter adjusting coefficients in real-time to match varying vibratory frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive damping pads are used to reduce vibrations, then vibration isolation is improved, but the fixation strength is compromised because the pads cannot be made very supple without losing structural support capability
Solution Approach 1:
An active control system is introduced as an intermediary between the rotary machine and the physical structure. The system uses sensors to detect vibrations, a calculator to process the signals, and actuators to generate counteracting forces, thereby mediating the vibration transmission without requiring the fixation supports to be both strong and supple simultaneously
Solution Approach 2:
The passive mechanical damping system is replaced with an active control system that uses electronic sensing, digital signal processing, and controlled actuation. This substitution allows vibration reduction without relying on the mechanical properties of damping pads, thus maintaining fixation strength while reducing vibration transmission
2Adaptability or versatility
If the speed of rotation of the rotary machine varies, then operational flexibility is improved, but the vibration frequency changes requiring continuous adjustment of control parameters
Solution Approach 1:
The control system continuously monitors the actual vibration frequency through sensors and uses this feedback to automatically adjust the control parameters. The calculator receives vibration signals, determines the current frequency, and modifies the Youla parameter coefficients accordingly, eliminating the need for manual parameter adjustment when speed varies
Solution Approach 2:
The control system is designed to be dynamic rather than static. The Youla parameter coefficients are not fixed but are continuously adapted based on the current operating conditions and vibration frequency. This dynamic adaptation allows the system to maintain effectiveness across a range of speeds without increasing operational complexity
Data Source
AI summary
A method and a device are based on the application of an active correcting system with central corrector and Youla parameter for the attenuation of essentially monofrequency mechanical vibratory perturbations generated in a material structure by a rotating machine. Previously, a control law corresponding to a block modeling of the system is established and calculated, the blocks being, on the other hand, those of the central corrector and, on the other hand, a Youla parameter block, the modeling being such that only the Youla parameter, in the form of an infinite impulse response filter, has coefficients dependent on the vibratory perturbation frequency. During a phase of use, in real time, the frequency of the current perturbation is determined and the control law is calculated using for the Youla parameter the stored coefficients of a determined perturbation frequency corresponding to the current perturbation frequency.