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In this brief, a boundary control scheme is designed to suppress the vibration for a nonlinear drilling riser system. Considering the varying length, varying tension, and varying speed of the riser, the drilling riser is modeled as a moving Euler–Bernoulli beam system, which is described by a partial differential equation and four ordinary differential equations. Employing the Lyapunov’s direct method,...
In the paper a problem of the control vibrations of the smart aluminum plate with SFSF (Supported-Free-Supported-Free) boundary conditions is considered. In order to obtain effectively control system the plate is equipped in two piezo-patch actuators and two piezo-patch sensors oriented in two perpendicular directions X and Y, respectively. Such locations and orientations of the piezo-elements allow...
Multi Positive Feedback (MPF) control is proposed in this paper for simultaneous resonant vibration displacement and velocity suppression in flexible distributed parameter structures. Two separate sets of control patches are used in the MPF control design, as one set is fed by vibration displacement and the other by vibration velocity. The aggregate applied control output using this approach is non-zero,...
This paper presents the experimental implementation of the multi-variable resonant control scheme with an integral action to compensate the vibration and the cross coupling effect between the axes of the piezoelectric tube scanner (PTS) in an atomic force microscope (AFM) for fast image scanning. The aim of the current work is to improve the high speed imaging performance of the AFM through multi-variable...
The robust vibration control of a flexible beam has been investigated by using H∞ control scheme. The finite element method and experimental modal test are applied to obtain the model of a beam with piezoelectric actuators and strain gage transducer. Taking into account the uncertain disturbance and measurement noise, the augmented closed-loop system with output weighting is presented by selecting...
Structure integrated or conformal antenna arrays consist of several spatially distributed patches. Integrated in aircraft fuselages the array is excited by inherent engine and turbulent boundary layer induced vibrations. These disturbances lead to distortions of single patch orientation and thus to unknown phase differences in the patch signals. Smart-structures technology is the key to overcome this...
Coriolis mass flowmeter (CMF) is significant in many industrial and commercial areas. The two-phase flow, external vibration or flow pulsation in a Coriolis mass flowmeter can cause errors in the meter's measurements of density and mass flow rate. Some errors may be due to the closed-loop control system. In this paper, they are investigated from analog and digital closed-loop control system by experiment...
This paper describes the development of a decoupled vibratory feeding system (DVFS), while the design and fuzzy control strategy are stressed. In DVFS, the vibration angle and the frequency and the waveform of the driving signals as well as the phase angle between the vertical vibration and horizontal vibration all can be easily adjusted, in software way, to suit agile manufacturing. The computer...
This paper describes the development of a decoupled vibratory feeding system (DVFS), while the design and commercialization issues are stressed. In DVFS, the vibration angle and the frequency and the waveform of the driving signals as well as the phase angle between the vertical vibration and horizontal vibration all can be easily adjusted, in software way, to suit agile manufacturing. The computer...
The dual-mass double-linear vibrational gyroscopes are insensitive to the environment, and their differential outputs can effectively suppress the common mode interference. A structure-decoupled dual-mass MEMS(micro-electro-mechanical system) gyroscope is studied in this paper, which can realize the full decoupling of the driving mode and sensing mode. In order to improve the performance of the dual-mass...
This paper considers the problem of controlling flexible systems, such as rotating shafts, whose dynamics is described by the wave equation. In previous works, infinite dimension transfer functions were introduced. Their special structure lead to the absolute vibration suppression (AVS) linear collocated controller that results in a low order plus delay closed loop transfer function, hence eliminates...
An articulated aerial work platform is a type of off highway vehicle with a long/flexible beam to provide temporary access to inaccessable areas. The motivation of the research is to improve productivity and safety of the work platform via advanced control schemes. In this paper, a motion control architecture is presented for trajectory tracking and vibration suppression. By using the sensors integrated...
Considerable attentions have been devoted recently to active vibration control using intelligent materials as sensors/actuators. This paper presents results on active control schemes for vibration suppression of flexible cantilever beam with bonded piezoelectric sensors and actuators. State equations which the generalized modal coordinates as variables are built. With the piezoelectric elements are...
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