scholarly journals Bidirectional Active Piezoelectric Actuator Based on Optimized Bridge-Type Amplifier

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1013
Author(s):  
Weiqing Huang ◽  
Junkai Lian ◽  
Mingyang Chen ◽  
Dawei An
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Piezoelectric Actuators ◽  
Displacement Curve ◽  
Structural Flexibility ◽  
The Finite Element Method ◽  
Return Stroke ◽  
Positioning Accuracy ◽  
Nonlinear Error ◽  
Bridge Type

Piezoelectric actuators based on bridge displacement amplifying mechanisms are widely used in precision driving and positioning fields. The classical bridge mechanism relies on structural flexibility to realize the return stroke, which leads to the low positioning accuracy of the actuator. In this paper, a series bridge mechanism is proposed to realize a bidirectional active drive; the return stroke is driven by a piezoelectric stack rather than by the flexibility of the structure. By analyzing the parameter sensitivity of the bridge mechanism, the series actuation of the bridge mechanism is optimized and the static and dynamic solutions are carried out by using the finite element method. Compared with the hysteresis loop of the piezoelectric stack, the displacement curve of the proposed actuator is symmetric, and the maximum nonlinear error is improved. The experimental results show that the maximum driving stroke of the actuator is 129.41 μm, and the maximum nonlinear error is 5.48%.

Spin-Off Maneuvers of Flexible Satellite Using PD Based Constant-Amplitude Inputs

2013 ◽  
Vol 465-466 ◽  
pp. 337-344
Author(s):  
Parman Setyamartana ◽  
Radzuan B. Razali ◽  
Azman Zainuddin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Steady State ◽  
Input Shaping ◽  
Structural Flexibility ◽  
Main Body ◽  
Solar Panels ◽  
The Finite Element Method ◽  
Constant Amplitude ◽  
The Earth

Spin-off maneuver of a flexible satellite using constant-amplitude thrusters is studied in this paper. The satellite consists of a rigid main body and two symmetrical solar panels. The panels are having structural flexibility and their motions are discretized following the finite element method. Under constant-amplitude thrusts, steady-state attitude angle oscillations may occur in large amplitude after the maneuvers. Since in operation the satellite should point to certain area on the earth precisely, these oscillations of course are not acceptable. To reduce the oscillations, proportional derivative (PD) based constant-amplitude input shaping logic is proposed to determine time locations of thruster switching. Then, under such inputs, spin-downs of the satellite are simulated numerically. Results of simulations indicate that the precise orientation of the satellite can be achieved.

Development of a Compact Deformable Mirror Using Push-Pull Actuators

2014 ◽  
Vol 613 ◽  
pp. 200-203
Author(s):  
Hiroki Shimizu ◽  
Keitaro Tanaka ◽  
Yuuma Tamaru
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Piezoelectric Actuators ◽  
Practical Method ◽  
Simulation Method ◽  
Deformable Mirror ◽  
The Finite Element Method ◽  
Convex Shape ◽  
Long Term Stability

A small deformable mirror which realizes concave shape as well as convex shape has been developed. In addition, this deformable mirror was developed to realize long term stability. For this purpose, a new push-pull actuator using two multilayered piezoelectric actuators aligned inline was designed. In this process, a practical method for simulating the property of piezoelectric actuator in the finite element method was proposed. From the experimental results, it was confirmed that newly developed deformable mirror has the ability to make complex profiles. Furthermore, efficiency of proposed simulation method was also confirmed.

Analysis of Hydrostatic Extrusion by the Finite Element Method

1972 ◽  
Vol 94 (2) ◽  
pp. 697-703 ◽  
Author(s):  
K. Iwata ◽  
K. Osakada ◽  
S. Fujino
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Plane Strain ◽  
Frictional Coefficient ◽  
Hydrostatic Extrusion ◽  
Displacement Curve ◽  
Element Solution ◽  
The Finite Element Method ◽  
Entry And Exit ◽  
Element Method

An elastoplastic analysis of hydrostatic extrusion is made using the finite element method. The effect of frictional coefficient on the spread of plastic zone, the pressure-displacement curve, and the stress and the strain distributions are studied for the non-steady state in plane-strain and axisymmetric extrusions. Comparisons of results between the finite element solution and slip-line solution and between plane-strain and axisymmetric extrusions are presented. Tensile stresses on the surface of the extruded part behind the die are found to exist. It is also found that the die pressure is high near the die entry and exit and that the surface of the billet in front of the die entry tends to contract.

AA5083 Aluminium Alloy Constants Identification through Inverse Analysis of the Erichsen Test

2012 ◽  
Vol 271-272 ◽  
pp. 208-211 ◽  
Author(s):  
Giuliano Gillo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aluminium Alloy ◽  
Inverse Analysis ◽  
Sheet Material ◽  
Experimental Tests ◽  
Displacement Curve ◽  
The Finite Element Method ◽  
Inner Surface ◽  
Erichsen Test

In this paper, considering an isotropic rheological law of the sheet material and the power law relationship between the stress and the plastic strain, the Erichsen test is used to identify the material constants of AA5083 aluminium alloy coupling experimental tests results with numerical ones obtained by using the finite element method. The function which is minimized by inverse analysis includes simultaneously the load-displacement curve of the punch, the normalized thickness measured at the bulge apex and the distance measured between the thinnest area of the metal sheet and the inner surface of the blankholder.

A Linear Piezomotor Integrated by a Monolithic Flexural Frame

1997 ◽  
Vol 119 (3) ◽  
pp. 414-416 ◽  
Author(s):  
Zhenqi Zhu ◽  
Bi Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Machine Tool ◽  
Design Process ◽  
Piezoelectric Actuators ◽  
Design Strategy ◽  
The Finite Element Method ◽  
Positioning Systems ◽  
High Stiffness ◽  
Mechanical Elements

A novel linear piezomotor is developed for machine tool applications. This paper presents the design strategy for this high stiffness linear piezomotor with nanometer resolution. The linear piezomotor consists of three piezoelectric actuators and one monolithic flexural frame. The design strategy is to reduce the total number of mechanical elements and interfaces and to integrate all the elements into the frame. The finite element method is used in the design process. The design strategy should also be applicable to other positioning systems where a high stiffness and high positioning resolution are required.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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