Model-based active control of a continuous structure subjected to moving loads

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Stancioiu, D.^1 ; Ouyang, H.^2

School of Engineering, Technology and Maritime Operations, Liverpool John Moores University, Byrom Street, Liverpool

L3 3AF, United Kingdom^1

School of Engineering, Liverpool University, Brownlow Hill, Liverpool

L63 3GF, United Kingdom^2

关键词: Accurate modeling;    Continuous structures;    Feedback controller;    Model based control design;    Model-based OPC;    Positive position feedback;    Structural control;    Theoretical modelling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012001/pdf
DOI  :  10.1088/1742-6596/744/1/012001

来源: IOP

【 摘 要 】

Modelling of a structure is an important preliminary step of structural control. The main objectives of the modelling, which are almost always antagonistic are accuracy and simplicity of the model. The first part of this study focuses on the experimental and theoretical modelling of a structure subjected to the action of one or two decelerating moving carriages modelled as masses. The aim of this part is to obtain a simple but accurate model which will include not only the structure-moving load interaction but also the actuators dynamics. A small scale rig is designed to represent a four-span continuous metallic bridge structure with miniature guiding rails. A series of tests are run subjecting the structure to the action of one or two minicarriages with different loads that were launched along the structure at different initial speeds. The second part is dedicated to model based control design where a feedback controller is designed and tested against the validated model. The study shows that a positive position feedback is able to improve system dynamics but also shows some of the limitations of state- space methods for this type of system.