Active vibration control

About: Active vibration control is a research topic. Over the lifetime, 6770 publications have been published within this topic receiving 76599 citations. The topic is also known as: active vibration damping.

Active vibration control of flexible cantilever beam using piezo actuator and Filtered-X LMS algorithm

Abstract: This paper presents the active vibration control of a flexible cantilever beam. The cantilever beam was excited by steady-state sinusoidal and white noise point forces. The vibrational control system was implemented using one piezo ceramic actuator bonded on the beam and the adaptive controller based on the Filtered-X LMS algorithm. Control results indicated that a considerable vibrational reduction could be achieved in a few seconds. Experimental results, demonstrate the feasibility of active vibration control of the flexible cantilever beam based on piezo ceramic actuator and the Filtered-X LMS algorithm.

Vibration isolation device with load dependent stiffness

Abstract: A vibration isolation device is disclosed. More specifically the vibration isolation device of the present invention comprises means for decreasing the mount stiffness when loads above a threshold load value are applied to the device. The means for decreasing the mount stiffness comprises a shear pin (30) with shear locations that comprise annular grooves with semielliptical cross sections.

Active Vibration Control of Flexible Structures Using Genetic Optimisation

Abstract: This paper presents an investigation into the development of an adaptive control mechanism for vibration suppression of flexible beam structures using genetic algorithms (GAs). The global search technique of GA is used to estimate the controller transfer function, based on one-step-ahead prediction. An active vibration control (AVC) system is designed utilizing a single-input single-output (SISO) control structure to yield optimum cancellation of broadband vibration at an observation point along the beam. The mean-squared error of observed deflection is adopted as the fitness function and randomly selected controller parameters are optimised for different, arbitrarily chosen order to fit to the system by applying the working mechanism of GA. The global search technique of the GA is utilised to obtain the best parameters among all attempted orders for the controller. The GA-AVC algorithm thus developed is implemented within the simulation environment of a flexible beam structure and simulation results are presented to assess the performance of the system, with different types of excitation namely pseudo-random binary sequence, uniform random and finite duration step signals. It is noted that, the system performance is satisfactory and significant amount of vibration reduction over a broad range of frequencies of the input signal is achieved.

Non-probabilistic time-variant reliability assessment (NTRA) for the active control of vibration systems with convex uncertainties.

Abstract: Uncertainties, such as material dispersion, loading fluctuation and cognitive inconsistency, widely exist in active vibration control systems, and more importantly, the controller performance is generally sensitive to the parametric deviation Thus, the uncertainty-oriented safety assessment for the controlled structure is of great significance in practical engineering In view of the limitation of uncertain samples, a novel non-probabilistic time-variant reliability assessment (NTRA) approach, which combines the set-theoretical convex model and the first-passage method, is proposed for vibration suppression problems under the linear quadratic regulator (LQR) control scheme Boundary rules and the time-dependency features of the controlled responses are first determined using the space-state transformation and the convex process theory For safety reasons, a new time-variant reliability index is defined under the area-ratio principle, and its solution details are further discussed Two engineering examples and one experimental case are presented to demonstrate the validity and applicability of the developed methodology