Affiliation:
1. Politecnico di Milano, Department of Mechanical Engineering, Via La Masa 1, 20156 Milano, Italy
Abstract
In many structures, undesired noise and vibrations generated by external sources represent a huge problem in terms of structural damage and comfort. Active vibration absorbers can be used to dynamically suppress vibrations, by increasing the damping of the system. A wireless smart active damper has been developed to perform this task and some automated functionalities have been implemented to perform the identification of the structure on which it is mounted on. The sharing of information between wireless sensors represents one of the most interesting features of this kind of control system. In this work, a procedure to estimate the nondimensional damping and modal amplitude for each wireless sensor location and each vibration mode is studied. Then, the information obtained by each sensor in the identification phase are used to implement a coordinated control strategy, which is based on a modified version of the Efficient Modal Control (EMC). Such control strategy implements the low level Selective Negative Derivative Feedback control law and modulates the control gains of each actuator and controlled mode pair in order to get an effective vibration reduction. The tuning procedure represents the next step of the algorithm, in which the evaluation of the introduced damping and the maximum applicable gains are derived; finally, the proposed solution is validated with experimental results on a simply-supported beam.
Subject
Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science
Reference21 articles.
1. Dynamic analysis of structures with multiple tuned mass dampers;Lewandowski;J. Civ. Eng. Manag.,2009
2. On the nature of the interaction between structures and proof-mass actuators;Zimmerman;J. Guid.,1989
3. Paulitsch, C., Gardonio, P., Elliott, S.J., Sas, P., and Boonen, R. (2004, January 20–24). Design of a lightweight, electrodynamic, inertial actuator with integrated velocity sensor for active vibration control of a thin lightly-damped panel. Proceedings of the 2004 International Conference on Noise and Vibration Engineering, Leuven, Belgium.
4. Winberg, M., Johansson, S., and Claesson, I. (2004, January 5–8). Inertial mass actuators, understanding and tuning. Proceedings of the 11th International Congress on Sound and Vibration (ICSV11), St. Petersburg, Russia.
5. Decentralized active vibration control in cruise ships funnels;Cinquemani;Ocean. Eng.,2017