The paper presents an active vibration control system based on low dynamic stiness of suspension. Using a simple two degrees-of-freedom system a few basic concepts of lowering suspension dynamic stiness are presented. Through reducing the dynamic component of force between the protected subsystem and remaining part of the system, considerable vibration suppression is achieved. Linear and nonlinear algorithms are proposed. In the case of nonlinear control algorithm, the sucient link between the protected subsystem and the remaining part of the system necessary to change the position of the protected subsystem is maintained. Experiments described in the paper cover two dierent cases. In the rst case, the suspension operated as the passive suspension, while in the second case, the active reduction system was included. The results are presented graphically.
The aim of the work is to investigate power flows in the vibration reduction system equipped with a magnetorheological (MR) damper and energy regeneration. For this purpose, experiments were conducted in the test rig compound of the shaker and the vibration reduction system (electromagnetic harvester, MR damper, spring) which are attached to the sprung mass. The experimental data acquired under sine excitations enabled us to analyze instantaneous power fluxes, as well as a rate of inertial energy changes in the system.
This study investigated the self-sensing mechanism in the electromagnetic vibration-based energy harvester (EV-EH) prototype specially engineered for a commercial magnetorheological (MR) damper. The objective of the work is to demonstrate that the EV-EH unit with a specific self-powered feature can also be employed as a relative velocity sensor in the system. To do this, the self-sensing action of the unit was experimentally studied over the assumed range of working conditions. The analysis of the test results and the determined self-sensing function indicated that the EV-EH has a highly accurate monitoring capability. The EV-EH self-sensing and self-powered features confirm the potentials and applicability of the unit for MR damper control in a vibration reduction system with energy regeneration.
The paper presents an experimental study of active mass damper control strategy based on analysis of energy dissipation. The reduced model of telecommunication mast was built in laboratory. Using the special laboratory setup the verification of the proposed strategy was carried out for free and forced vibrations. Uniaxial and biaxial reduction systems were considered. Experiments confirmed that the proposed algorithm is effective. The best vibrations reduction was obtained using biaxial reduction system.
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