scholarly journals Actuating Voltage Waveform Optimization of Piezoelectric Inkjet Printhead for Suppression of Residual Vibrations

Micromachines ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 900
Author(s):  
Muhammad Ali Shah ◽  
Duck-Gyu Lee ◽  
Bo Yeon Lee ◽  
Nam Woon Kim ◽  
Hyojin An ◽  
...  
Keyword(s):  
Dwell Time ◽  
Voltage Amplitude ◽  
Optimal Parameters ◽  
Voltage Waveform ◽  
Tuning Time ◽  
Waveform Optimization ◽  
Lumped Element ◽  
Bipolar Voltage ◽  
Inkjet Printhead ◽  
Rising Time

After a piezoelectric inkjet printhead jets the first droplet, the actuating membrane still vibrates, creating residual vibrations in the ink channel, which can degrade the inkjet printhead performance. For suppressing these vibrations, an optimized actuating voltage waveform with two pulses must be obtained, of which the first pulse is used for jetting and the second pulse is used to suppress the residual vibrations. In this study, the pressure history within the ink channel of a recirculating piezoelectric inkjet printhead was first acquired using lumped element modeling. Then, for suppressing residual vibrations, a bipolar voltage waveform was optimized via analysis of the tuning time (tt ), dwell time (td2), rising time (tr2), falling time (tf2), and voltage amplitude of the second pulse. Two voltage waveforms, Waveform 01 and Waveform 02, were optimized thereafter. In Waveform 01, tt=2 μs, td2=2 μs, and tr2 and tf2=1 μs were finalized as the optimal parameters; in the case of another waveform, the optimal parameters of td2, tr2, and tf2 were found to be 4, 1, and 1 μs, respectively. The optimal voltage amplitude of the second pulse was found to be 1/3 the amplitude of the first pulse. On the basis of our analysis, the tuning time in Waveform 01 is the most sensitive parameter, and the performance yielded is even poorer than that yielded by standard waveform, if not optimized. Therefore, the other waveform is recommended for the suppression of residual vibrations.

scholarly journals B-PO02-094 QUANTIFYING THE VARIABILITY OF BIPOLAR VOLTAGE AMPLITUDE WITH SENSING ANGLE IN RESIDUAL CONDUCTION ISTHMUSES IN ATRIAL SCAR

Heart Rhythm ◽  
2021 ◽  
Vol 18 (8) ◽  
pp. S134-S135
Author(s):  
Jose L. Merino ◽  
Steven Kim ◽  
Jatin Relan ◽  
Margarita Sanroman ◽  
Sergio Castrejon ◽  
...  
Keyword(s):  
Voltage Amplitude ◽  
Bipolar Voltage

Modeling and Optimizing Industrial Inkjet Printhead for Printable Electronics Fabrication

2015 ◽  
Vol 748 ◽  
pp. 15-19
Author(s):  
Lian Bo Ma ◽  
Mao Wei He ◽  
Kun Yuan Hu ◽  
Yun Long Zhu
Keyword(s):  
Experimental Studies ◽  
Element Model ◽  
Printable Electronics ◽  
Lumped Element ◽  
Drop On Demand ◽  
Printing Quality ◽  
Lumped Element Model ◽  
Driving Waveform ◽  
Nonlinear Behaviors ◽  
Inkjet Printhead

The most significant issues in printable electronics fabrication are the printing quality and efficiency delivered by drop-on-demand (DOD) industrial inkjet printhead. Aiming to characterize the nonlinear behaviors of piezoelectric inkjet printhead, the dynamic lumped element model (DLEM) is proposed to cast the original LEM into a time-varying and nonlinear fashion. At the same time , the PSO-based optimization for paramenters is incorporated in DLEM. Due to new characteristics, DLEM can accurately simulate the inkjet-printed nanosilver droplet formation process and effectively predicate optimal combinations of high-frequency driving waveform with high printing quality. From extensive experimental studies, the effectiveness and efficiency of the proposed DLEM is validated.

Waveform optimization of a two-axis smooth impact drive mechanism actuator

2020 ◽  
pp. 1045389X2095126 ◽  
Author(s):  
Jianxiang Wang ◽  
Yuxi Chen ◽  
Yuxin Peng ◽  
Xian Song ◽  
Yangkun Zhang ◽  
...  
Keyword(s):  
Short Term Memory ◽  
Maximum Velocity ◽  
Input Voltage ◽  
Data Driven ◽  
Voltage Waveform ◽  
Drive Mechanism ◽  
Waveform Optimization ◽  
Piezoelectric Elements ◽  
Long Short Term Memory ◽  
Optimum Input

This paper presents a data-driven method for waveform optimization of a two-axis smooth impact drive mechanism (SIDM) actuator. The actuator was constructed by two piezoelectric elements (PZTs) perpendicularly fixed to an L-shaped base for two-axis positioning. An XY stage was designed and constructed by assembling the two-axis SIDM actuator. The XY stage could position long motion ranges of several millimeters with nanometer-level resolution, and the size was confined to be 20 mm (X) × 20 mm (Y) × 4.5 mm (H). The data-driven method based on the long short-term memory (LSTM) neural networks was used to predict the optimum input voltage waveform of the actuator. With the optimized input voltage waveform, it was verified that the maximum velocity of the stage could be improved about two times.

No-Load Voltage Waveform Optimization of Integral Number Slots Large Hydro-Generator by Increase the Number of Damper Bars per Pole

2013 ◽  
Vol 756-759 ◽  
pp. 3909-3913
Author(s):  
Zhi Gang Zhang ◽  
Zhen Nan Fan
Keyword(s):  
Electromagnetic Field ◽  
Coupling Model ◽  
Voltage Waveform ◽  
Load Voltage ◽  
Electric Network ◽  
Design Standard ◽  
Waveform Optimization ◽  
Integral Number

In order to analyze the influence of integral-number slots large hydro-generator no-load voltage waveform by the number of damper bars per pole increase, the 2D moving electromagnetic field-circuit coupling model is established, and the no-load voltage waveforms of a 600MW integral-number slots hydro-generator are calculated and analyzed. The results show that the harmonics are weakened and the waveforms of the no-load voltage are improved observably when reasonable increase the number of the damper bars per pole. The research is helpful for improving design standard and enhancing the operation reliability of the large hydro-generator and electric network.

Standard peak-to-peak bipolar voltage amplitude criteria underestimate myocardial scar during substrate mapping with a novel microelectrode catheter

Heart Rhythm ◽  
2020 ◽  
Vol 17 (3) ◽  
pp. 476-484 ◽  
Author(s):  
Adam Lee ◽  
Tomos E. Walters ◽  
Christina Alhede ◽  
Eric Vittinghoff ◽  
Richard Sievers ◽  
...  
Keyword(s):  
Myocardial Scar ◽  
Voltage Amplitude ◽  
Bipolar Voltage

scholarly journals Design and Characteristic Analysis of a MEMS Piezo-Driven Recirculating Inkjet Printhead Using Lumped Element Modeling

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 757 ◽  
Author(s):  
Shah ◽  
Lee ◽  
Hur
Keyword(s):  
Resonance Frequency ◽  
High Performance ◽  
Fem Simulation ◽  
Pressure Chamber ◽  
Design Parameters ◽  
Characteristic Analysis ◽  
Helmholtz Resonance ◽  
Lumped Element ◽  
Lumped Element Model ◽  
Inkjet Printhead

The recirculation of ink in an inkjet printhead system keeps the ink temperature and viscosity constant, and leads to the development of a high-performance device. Herein, we propose a recirculating piezo-driven micro-electro-mechanical system (MEMS)-based inkjet printhead that has a pressure chamber, a nozzle, and double restrictors. The design and characteristic analysis are performed using a two-port lumped element model (LEM) to investigate the effect of design parameters on the system responses. Using LEM, the jetting pressure at the pressure chamber, velocity at the nozzle inlet, meniscus pressure, and Helmholtz resonance frequency are predicted and the comparative analysis of the jetting pressure and velocity between LEM and the finite element method (FEM) simulation is conducted to validate our proposed LEM method. Furthermore, the effect of a change in major design parameters on the jetting pressure, velocity, and Helmholtz resonance frequency is analyzed. On the basis of this analysis, the optimized device dimensions are finalized. From our analysis, it is also concluded that the restrictor is more sensitive than the pressure chamber in terms of their variations in depth. As the cross-talk effect can occur due to an array of hundreds or thousands of nozzles, we investigated the effect of a single activated nozzle on the non-activated neighboring nozzles, as well as the effect of multi-activated nozzles on a single central nozzle using our proposed LEM.

scholarly journals Drop-on-Demand Inkjet Printhead Performance Enhancement by Dynamic Lumped Element Modeling for Printable Electronics Fabrication

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Maowei He ◽  
Liling Sun ◽  
Kunyuan Hu ◽  
Yunlong Zhu ◽  
Lianbo Ma ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Element Model ◽  
Printable Electronics ◽  
Lumped Element ◽  
Drop On Demand ◽  
Printing Quality ◽  
Lumped Element Model ◽  
Analytic Models ◽  
Nonlinear Behaviors ◽  
Inkjet Printhead

The major challenge in printable electronics fabrication is the print resolution and accuracy. In this paper, the dynamic lumped element model (DLEM) is proposed to directly simulate an inkjet-printed nanosilver droplet formation process and used for predictively controlling jetting characteristics. The static lumped element model (LEM) previously developed by the authors is extended to dynamic model with time-varying equivalent circuits to characterize nonlinear behaviors of piezoelectric printhead. The model is then used to investigate how performance of the piezoelectric ceramic actuator influences jetting characteristics of nanosilver ink. Finally, the proposed DLEM is applied to predict the printing quality using nanosilver ink. Experimental results show that, compared to other analytic models, the proposed DLEM has a simpler structure with the sufficient simulation and prediction accuracy.

Sign in / Sign up

Export Citation Format

Share Document