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This paper presents a sensorless positioning control approach for piezo-actuated systems, using a simple external circuit. To achieve high-precision positioning with a piezoelectric actuator, a feedback control system using a high-resolution position sensor in incorporated, to cancel nonlinearities and disturbances. However, sensorless control is desirable to reduce cost and space utilization in micro-...
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,...
In model reduction and vibration control of piezoelectric flexible structures, the spatial norms is used to measure the intensity of modes to system dynamical response, and the influence of the location of piezoelectric actuators on modeling dynamic equations and designing controllers is analyzed. Compared with traditional direct modes truncation method, a dynamic output feedback H-infinity control...
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...
This work developed a novel application of piezo electric thin-film sensing technology by incorporating ZnO strain sensors into a hard disk drive (HDD) to support the high-bandwidth, nanometer-level positioning required to achieve terabit-per-square-inch data densities. First, ZnO sensors were fabricated directly onto a HDD suspension component, which was a unique and challenging process since the...
This paper presents a haptic interface actuated by a Traveling Wave Ultrasonic Motor (TWUM). First, we detail a one degree of freedom force-feedback device on which control laws are tested. Then the control strategy is presented. It relies on a modeling of the motor which is inverted in order to reach the control laws. We present a strategy to attain good behavior when the lever rotates at low rotational...
Taking the piezoelectric flexible beam as the research object, this paper proposed a FXLMS algorithm based MIMO adaptive vibration control method to attenuate the oscillations of flexible structures at low frequency. By introducing the piezoelectric constitutive equations and analyzing the multi-channel adaptive filtered feedforward control algorithm and its FXLMS algorithm process, the model parameter...
A new time-sharing self-sensing method using piezoelectric actuators for active vibration suppression is proposed and investigated. This self-sensing technique is based on the idea that one PZT can have two electrical properties, namely whether it acts as a sensor or as an actuator. The actuation characteristics of the time-sharing self-sensing piezoelectric actuators were discussed. The shift between...
In this paper, an adaptive active vibration control is proposed and implemented to a piezoelectric (PZT) stewart platform exhibiting nonlinearity. An adaptive controller based on filtered-x least mean square (LMS) algorithm is presented to attenuate vibration. The vibration control experiment is constructed using a digital signal processor (DSP) control system. Experimental results demonstrate that...
In this paper a piezoelectrically actuated microsensor for simultaneous measurement of fluids viscosity and density is presented. The sensor consist of a beam with two piezoelectric layers, which are located on the upper and lower surfaces of it and a sensing plate at the end of it which is immersed in a fluid. In the developed model, the governing coupled partial differential equations of longitudinal...
This paper demonstrates an active vibration control system of flexible structures by using piezoelectric sensors and actuators. A set of vibration control equations, sensing equations and actuating equations are derived through using the modal theory for piezoelectric flexible structures, then the model is converted into the state space form. With recent developments in sensors/actuators technologies,...
Based on the linear quadratic Gauss (LQG) optimal control method, the paper introduces an effective procedure to suppress the vibration of flexible structures with the sensors/actuators are symmetrically collocated on both sides of the same position on the host structure. The model of a piezoelectric intelligent cantilever beam is built by the application of ANSYS software. The D-optimal design principle...
A novel hybrid robust control design method is investigated for a three-axis-rotational maneuver and vibration stabilization of a spacecraft with flexible appendages. Based on the backstepping, a robust attitude control law is derived to control the attitude motion of spacecraft. For actively suppressing the induced vibration, strain rate feedback control methods are presented by using piezoelectric...
This paper addresses the dynamic modeling and active vibration control of a 3-PRR parallel manipulator with three flexible intermediate links with multiple bonded lead zirconate titanate (PZT) actuators and sensors based on strain rate feedback (SRF). Using the assumed mode method, flexible intermediate links are modeled as Euler-Bernoulli beams with pinned-pinned boundary conditions. Experimental...
Thickness shear mode (TSM) sensors are widely employed as biosensors. One of the most important operational parameters of biosensors is their sensitivity. Due to the fact that TSM sensors have maximum sensitivity at the center of the sensing electrode, there has been increased research efforts focused on the development of techniques for controlling the distribution of the measurand over the sensor...
This paper is addressed to active vibration control of a simply-supported thin plate. In order to minimize the level of vibrations, the feedforward and feedback H2 controllers are applied via a piezoelectric actuator in the case of known and unknown disturbances respectively. The first five modes of plate between 0-500 Hz are considered as in-bandwidth modes. To evaluate the performance obtained the...
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