PROJECT TITLE :
Identification and Control of an MR Damper With Stiction Effect and its Application in Structural Vibration Mitigation
This paper presents the parameter identification and control of a magnetorheological (MR) damper with stiction result and its application to seismic protection of a model 2-story structure. This semi-active device is used to cut back the vibration of the model structure in response to earthquake excitations. 1st, changed Bingham and LuGre models which take into account the stiction result and the rate-dependent nature of the damper force are proposed. The parameters of the models are identified by solving a nonlinear optimization downside. The Bingham model is considered as a result of of its easy structure to be used in linear parameter varying (LPV) style framework. The parameter identification is performed whereas the MR damper is hooked up to the structure. These models are verified experimentally for different operating conditions showing a suitable level of accuracy. The subsequent half of the paper addresses the planning of different types of controllers to command the MR damper to suppress the structural vibrations of a model building because of earthquake excitations. Two varieties of controllers are thought of during this study: 1) an $H_infty $ inverse management based on the mixed-sensitivity design and 2) a dynamic output-feedback LPV controller. In the former one, an $H_infty $ controller is meant for the linear structure and the modified LuGre-based mostly inverse model is employed to determine the required voltage from the commanded force. The LPV controller is intended for the combined structure and MR damper based on the modified Bingham model considering the damper velocity because the scheduling parameter. Each controllers are combined with a classical anti-windup theme to compensate the result of the saturation on the control voltage. An optimal passive damping style is additionally obtained for comparison purposes. The performance of the control- ers is compared with the passive damping case and clipped-optimal controller for the El Centro and Northridge earthquake inputs with totally different intensities. The experimental results show the improved performance of the LPV controller design in terms of the maximum acceleration and also the RMS values of the structure response.
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