Design and Control of a Trapezoidal Piezoelectric Bimorph Actuator for Optical Fiber Alignment

To align a pair of optical fibers, it is required that the micro actuators used be small and have the characteristics of high accuracy and fast response time. A trapezoidal piezoelectric bimorph actuator was proposed for pushing and pulling an optical fiber. Based on a mathematical model and finite...

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Bibliographic Details
Published inMaterials Vol. 16; no. 17; p. 5811
Main Authors Wang, Xinjie, Li, Jianhui, Lu, Xingfan
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 24.08.2023
MDPI
Subjects
Actuators
Bimorphs
control
Control methods
Design
Equipment and supplies
Feedforward control
Fiber optics
Finite element method
Fuzzy control
Geometry
Hysteresis
Mathematical models
Microactuators
optical fiber alignment
Optical fibers
Parameter identification
Particle swarm optimization
piezoelectric actuator
Piezoelectric actuators
Pneumatics
Proportional integral derivative
Response time
Shear strain
simulation analysis
structural design
Temperature effects
Tracking control
Tracking errors
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Summary:To align a pair of optical fibers, it is required that the micro actuators used be small and have the characteristics of high accuracy and fast response time. A trapezoidal piezoelectric bimorph actuator was proposed for pushing and pulling an optical fiber. Based on a mathematical model and finite element model established in this paper, we analyzed the output displacement and output force of the proposed trapezoidal piezoelectric actuator under the influence of structural parameters. Since the piezoelectric bimorph actuator had a hysteresis effect, we applied particle swarm optimization to establish a Prandtl–Ishlinskii (PI) model for actuator and parameter identification. Then, two control methods, namely feedforward control considering hysteresis effects and fuzzy proportional-integral-derivative (PID) control employing feedback, were proposed. Finally, a composite control model combining the two control methods with fewer tracking errors was designed. The results show that the output displacement of this actuator is larger than that of a rectangular one. Additionally, the fuzzy PID control has a lower response time (15 ms) and an overshoot (5%).
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma16175811