PZT actuator applied to a femto-liter droplet ejector

2007 ◽  
Vol 21 (10) ◽  
pp. 1732-1738 ◽  
Author(s):  
A. S. Yang ◽  
C. H. Cheng ◽  
F. S. Hsu
Keyword(s):  
Pzt Actuator ◽  
Droplet Ejector

scholarly journals Analysis of an annular PZT actuator for a droplet ejector

2007 ◽  
Vol 137 (2) ◽  
pp. 330-337 ◽  
Author(s):  
D.-A. Wang ◽  
C.-H. Cheng ◽  
Y.-H. Hsieh ◽  
Z.-X. Zhang
Keyword(s):  
Pzt Actuator ◽  
Droplet Ejector

Long stroke precision PZT actuator

1995 ◽  
Author(s):  
Robert Bamford ◽  
C Kuo ◽  
Robert Glaser ◽  
Ben Wada
Keyword(s):  
Pzt Actuator ◽  
Long Stroke

The dynamic micropump driven with a screen printed PZT actuator

1998 ◽  
Vol 8 (2) ◽  
pp. 119-122 ◽  
Author(s):  
M Koch ◽  
A G R Evans ◽  
A Brunnschweiler
Keyword(s):  
Pzt Actuator ◽  
Screen Printed

Pneumatic valve with a pressure regulator for bimorph type PZT actuator

2007 ◽  
Vol 20 (3-4) ◽  
pp. 215-220 ◽  
Author(s):  
S. N. Yun ◽  
Y. B. Ham ◽  
J. H. Park ◽  
H. J. So ◽  
I. Y. Lee
Keyword(s):  
Pressure Regulator ◽  
Pzt Actuator ◽  
Pneumatic Valve

Macro-Micro Dual-Drive Stages Based on Dual Switching Condition and Local Closed Loop

2015 ◽  
Author(s):  
Jiwen Fang ◽  
Zhili Long ◽  
Lufan Zhang
Keyword(s):  
Steady State ◽  
Theoretical Analysis ◽  
Closed Loop ◽  
Voice Coil Motor ◽  
Switching Control ◽  
Positioning Error ◽  
Vibration Displacement ◽  
Pzt Actuator ◽  
Output Displacement ◽  
State Error

This paper presents macro-micro dual-drive stages using the hybrid actuators composed of voice coil motor (VCM) and piezoelectric actuator (PZT actuator). The macro stage driven by voice coil motor can achieve large travel range and coarse positioning. The micro stage with an embedded flexure hinges mechanism, actuated by the PZT actuator, can realize short range but high precision positioning. To gain precise performance, the dynamic modes of macro stage and micro stage are equivalent to mass-damping-spring system in this research. According to theoretical analysis, the output displacement of micro stage is proportional to the extension of the PZT Actuator. The linear relationship will be used to the motion control of micro stage. To realize perfect performance, the variable gain PID controller is designed to control the macro stage. In order to prevent saturation and damage of PZT actuator, dual switching control, positioning error threshold and small vibration displacement, are applied to the switching control. Beyond the micro stage range, the micro stage must be kept in its equilibrium position while the VCM instead reaches a long travel. The PZT actuator controller is used to compensate for position error after switching control. When the error is less than a set thres hold value, the error signal is added into the micro control loop. So the macro-micro dual-drive stages are working together to reduce the positioning error. The relationship between PZT actuator of closed loop and input voltage is linear by theoretical analysis and experiment test. So the micro stage uses an open servo loop structure, but the PZT actuator is controlled with PI controller in local closed loop in order to eliminate the nonlinear of PZT. The experimental system used in this study is single-axis dual-driving stages. Turbo PMAC PCI-Lite is the core of the whole system and executes PLC programs with motion programs. Experiments show that the steady state error of dual-drive stage is nano level. The steady state error of dual-drive stage can be improved. So dual-drive stages can increase the positioning accuracy of the whole system and the performance is superior to the single VCM stage.

scholarly journals Active control of multiscale features in wall-bounded turbulence

2019 ◽  
Vol 36 (1) ◽  
pp. 12-21 ◽  
Author(s):  
Xiaotong Cui ◽  
Nan Jiang ◽  
Xiaobo Zheng ◽  
Zhanqi Tang
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Turbulent Energy ◽  
Streamwise Velocity ◽  
Discrete Wavelet ◽  
Wall Region ◽  
Mean Velocity ◽  
Pzt Actuator ◽  
The Impact ◽  
Near Wall

Abstract This study experimentally investigates the impact of a single piezoelectric (PZT) actuator on a turbulent boundary layer from a statistical viewpoint. The working conditions of the actuator include a range of frequencies and amplitudes. The streamwise velocity signals in the turbulent boundary layer flow are measured downstream of the actuator using a hot-wire anemometer. The mean velocity profiles and other basic parameters are reported. Spectra results obtained by discrete wavelet decomposition indicate that the PZT vibration primarily influences the near-wall region. The turbulent intensities at different scales suggest that the actuator redistributes the near-wall turbulent energy. The skewness and flatness distributions show that the actuator effectively alters the sweep events and reduces intermittency at smaller scales. Moreover, under the impact of the PZT actuator, the symmetry of vibration scales’ velocity signals is promoted and the structural composition appears in an orderly manner. Probability distribution function results indicate that perturbation causes the fluctuations in vibration scales and smaller scales with high intensity and low intermittency. Based on the flatness factor, the bursting process is also detected. The vibrations reduce the relative intensities of the burst events, indicating that the streamwise vortices in the buffer layer experience direct interference due to the PZT control.

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