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This paper discusses an adaptive algorithm to control a magnetorheological fluid vibration isolator operating under varying frequency of the vibration source. The algorithm provides automatic tuning of the isolator properties by controlling the viscosity of magnetorheological fluid in the throttle channels. This ensures efficient damping and vibration protection at the main harmonic of a varying vibrational...
In this paper, a novel method to control the stiffness characteristic of an oscillating system is analytically studied and experimentally assessed. The method principle consists in a controlled modification of tension or compression forces applied along the elastic column beams which support the system sprung mass. The control is achieved without contact by electromagnetic forces applied to the sprung...
As two 500kV high voltage direct current (HVDC) lines are planned to be installed in the Alberta transmission system in Canada, this work analyzes the potential low frequency oscillations in the system and designs damping controllers for the identified oscillation modes. By performing Prony analysis, oscillation modes in the power system are identified. Two oscillation modes are found in the system...
We present a study on the active control of vibrations of a flexible mechanical structure in presence of saturation affecting the closed-loop control signal. The application we consider here is a system composed of a flexible beam with one edge clamped on a movable support and the other kinematically free. Two piezoelectric patches are bonded on the beam: one of them is used as an actuator and the...
With engine developing towards high-speed, high-power and light-weight, problem of engine's vibration is becoming more and more serious. In order to reduce the engine's vibration, engine mount system must be designed. A kind of semi-active damp variable mount and its control law were introduced in the paper. By building simplified mount model, the vibration performance of a traditional passive mount,...
In this paper, a novel approach to reduce the effect of negative damping that causes brake noise is proposed by applying an active force control (AFC) based strategy to a two degree-of-freedom model of a disk brake system. At first, the disc brake model is simulated and analyzed using a closed loop pure PID controller. Later, it is integrated with AFC and simulated under similar operating environment...
In this paper, active control of flexible structures through utilization of structure mounted sensors and actuators is considered. Specifically, dynamic feedback design utilizing signals from the accelerometer mounted on the structure is discussed. Furthermore, utilization of piezoceramics for sensing and actuation to provide a higher level of control for vibration damping is investigated. The flexible...
An approach is described for designing broadband controllers for flexible structures with collocated sensors and actuators. The Statistical Energy Analysis assumptions of equipartition and incoherence, together with conservation of energy, are used to express the average value of a global H2 performance metric in terms of the power dissipation of the compensator. This power dissipation can be represented...
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