KEYWORDS: Actuators, Control systems, Sensors, Vibration control, Active vibration control, Analog electronics, Passive elements, Finite element methods
In this paper the application of an inerter to a control system based on inertial actuators is investigated. Since the dynamics of this kind of actuators affects the stability of the controlled system, the application of the inerter aims to limit instability problems by shifting down the resonance frequency of the actuator. The interaction of this passive element with the other vibration modes of the structure under control is not negligible. The inerter should be physically placed in parallel with the elastic suspension of the actuator and the transducer; in this paper, the inerter behavior is simulated by the inertial actuator through an acceleration feedback. First, the study is carried out on a two degrees-of-freedom model and stability considerations are made; then, the approach is implemented on the Finite Element model of a clamped-clamped beam which is also used as experimental test rig. Finally, the proposed solution is validated with experimental results.
In this work the use of many stand-alone devices is considered for active vibration control. A stand-alone device represents a control unit which is able to independently perform the vibration control task, since it is embedded with sensors, an inertial actuator and a microcontroller, in which the control algorithm is implemented. The developed active controller is also embedded with a wireless module, in order to share information with other devices within the network. The proposed solution aims to improve the performance a decentralized control architecture and it is based on the optimal control theory. The Linear Quadratic Regulator works with the fullstate of the system, which is provided through a state estimation. A state recovery algorithm is then adopted to improve the quality of the estimation without placing a hefty burden on the wireless channel. Numerical analysis is made in order to study the advantages of this method. Finally, the proposed solution is validated with experimental results from a clamped-clamped beam.
Inertial actuators are widely used in active vibration control, since they don’t need to react off the base structure. Then, unlike reactive actuators, they can be used as modules that can be directly installed on a vibrating structure. In many cases, inertial actuators are used to develop some stand-alone active dampers. Such devices are embedded with sensors and a microcontroller, in order to independently perform the vibration control task. This kind of control unit is commonly adopted to implement decentralized architectures. In this work, the main goal was to limit instability phenomena related to the dynamics of inertial actuators. The proposed solution also aims to improve the performance of a decentralized control strategy through a partial sharing of data between devices, without the use of cables. First, the formulation of the modified Negative Derivative Feedback resonant controller is derived; then, the steps of the control strategy are explained, which are based on a preliminary modal identification of the structure and the assignment of a compensator for each resonance frequency to be controlled. Finally, the proposed method is validated with experimental results from a clamped-clamped beam.
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