scholarly journals A Novel Self-Moving Framed Piezoelectric Actuator

2020 ◽  
Vol 10 (19) ◽  
pp. 6682
Author(s):  
Liang Wang ◽  
Bo Hao ◽  
Ruifeng Wang ◽  
Jiamei Jin ◽  
Qingsong Xu
Keyword(s):  
Piezoelectric Actuator ◽  
Electromagnetic Interference ◽  
Maximum Load ◽  
Piezoelectric Composite ◽  
Driving Frequency ◽  
Piezoelectric Actuation ◽  
Excitation Voltage ◽  
Mean Velocity ◽  
Confinement Fusion ◽  
Elliptical Motion

Utilizing the inherent advantages of the piezoelectric driving technology, such as good adaptability to vacuum environment and no electromagnetic interference, a novel self-moving framed piezoelectric actuator is proposed, simulated, and tested in this study, holding a potential application for magnetic confinement fusion. Four piezoelectric composite beams form a framed piezoelectric actuator. Two orthogonal vibration modes are excited and coupled in the framed piezoelectric actuator, producing a microscopic elliptical motion at its driving feet. Due to the friction, the framed piezoelectric actuator can move on a rail, thereby constructing the railed carrying system. Numerical simulation is carried out to confirm the operation principle and to conduct the dimensional optimization of the proposed framed piezoelectric actuator. A prototype of the proposed framed piezoelectric actuator with a weight of 83.8 g is manufactured, assembled, and tested, to verify the piezoelectric actuation concept. The optimal driving frequency of 20.75 kHz is obtained for the proposed actuator prototype, and at the excitation voltage of 400 Vpp its maximum mean velocity of 384.9 mm/s is measured. Additionally, the maximum load weight to self-weight of the proposed actuator prototype reached up to 10.74 at the excitation voltage of 300 Vpp. These experimental results validate the feasibility of the piezoelectric actuation concept on the railed carrying system.

An Action Reversible Mechanism with Piezoelectric Actuator

2011 ◽  
Vol 105-107 ◽  
pp. 1727-1730
Author(s):  
Yu Juan Tang ◽  
Jiong Wang
Keyword(s):  
Piezoelectric Actuator ◽  
Electromagnetic Interference ◽  
Small Volume ◽  
Safety System ◽  
Stepping Motor ◽  
Compact Structure ◽  
Drive Mechanism ◽  
Independent Components ◽  
Safe State

At present, the explosion isolator of the fuze safety system using stepping motor or based on the slider continuation move realized safe state restorability, but the former is restricted by the volume of stepping motor, however, the stepping motor is vulnerable to electromagnetic interference; the latter structure is complex, with several independent components, not compact and irreversible. In view of this, an action reversible mechanism based on piezoelectric actuator is proposed, realizing the fuze safety system reversibility. The principle of the piezoelectric actuator is described and the drive mechanism is designed. The feasibility is analysed. The study shows that the mechanism has the certain practical value for compact structure, small volume and reliable actuation.

scholarly journals A Novel Traveling Wave Sandwich Piezoelectric Transducer With Single Phase Drive: Theoretical Modeling , Experimental Validation and Application Investigation

2020 ◽  
Author(s):  
Liang Wang ◽  
Fushi Bai ◽  
Viktor Hofmann ◽  
Jiamei Jin ◽  
Jens Twiefel
Keyword(s):  
Transfer Matrix ◽  
Piezoelectric Transducer ◽  
Traveling Wave ◽  
Single Phase ◽  
Longitudinal Vibration ◽  
Experimental Results ◽  
Sandwich Composite ◽  
Driving Frequency ◽  
Mobile System ◽  
Mean Velocity

Abstract Most of traditional traveling wave piezoelectric transducers are driven by two phase different excitation signals, leading to a complex control system and seriously limiting their applications in industry. To overcome these issues, a novel traveling wave sandwich piezoelectric transducer with a single-phase drive is proposed in this study. Traveling waves are produced in two driving rings of the transducer while the longitudinal vibration is excited in its sandwich composite beam, due to the coupling property of the combined structure. This results in the production of elliptical motions in the two driving rings to achieve the drive function. An analytical model is firstly developed using the transfer matrix method to analyze the dynamic behavior of the proposed transducer. Its vibration characteristics are measured and compared with computational results to validate the effectiveness of the proposed transfer matrix model. Besides, the driving concept of the transducer is investigated by computing the motion trajectory of surface points of the driving ring and the quality of traveling wave of the driving ring. Additionally, application example investigations on the driving effect of the proposed transducer are carried out by constructing and assembling a tracked mobile system. Experimental results indicated that 1) the assembled tracked mobile system moved in the driving frequency of 19410 Hz corresponding to its maximum mean velocity through frequency sensitivity experiments; 2) motion characteristic and traction performance measurements of the system prototype presented its maximum mean velocity with 59 mm/s and its maximum stalling traction force with 1.65 N, at the excitation voltage of 500 V RMS . These experimental results demonstrate the feasibility of the proposed traveling wave sandwich piezoelectric transducer.

scholarly journals A Novel Impact Rotary–Linear Motor Based on Decomposed Screw-Type Motion of Piezoelectric Actuator

2018 ◽  
Vol 8 (12) ◽  
pp. 2492
Author(s):  
Liling Han ◽  
Liandong Yu ◽  
Chengliang Pan ◽  
Huining Zhao ◽  
Yizhou Jiang
Keyword(s):  
Piezoelectric Actuator ◽  
Degree Of Freedom ◽  
Rotary Motion ◽  
Maximum Diameter ◽  
Torsional Angle ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Linear Motion ◽  
Longitudinal Displacement ◽  
Two Degree Of Freedom

A novel impact two-degree-of-freedom (2-DOF) motor based on the decomposed screw-type motion of a piezoelectric actuator (PA) has been proposed. The fabricated prototype motor has a maximum diameter of 15 mm and a length of 100 mm which can produce a maximum torsional angle of about 1000 μrad and a maximum longitudinal displacement of about 1.03 μm under a saw-shaped driving voltage with 720 Vp-p (peak-to-peak driving voltage). When the axial prepressure generated by the spring is about 1N and the radial prepressure generated by the snap ring is about 14 N, the fabricated motor realizes rotary motion with the driving frequency from 200 Hz to 4 kHz. When the axial prepressure generated by the spring is about 11.7 N and the radial prepressure generated by the snap ring is about 21.1 N, the fabricated motor realizes linear motion with the driving frequency from 2 kHz to 11 kHz. In the experiments, the prototype motor can achieve 9.9 × 105 μrad/s rotary velocity at 2 kHz and it can achieve 2.4 mm/s linear velocity at 11 kHz under the driving voltage of 720 Vp-p.

Investigation of Oscillations of the Piezoelectric Actuator with Two-Directional Polarization

2013 ◽  
Vol 198 ◽  
pp. 328-333 ◽  
Author(s):  
Raimundas Lučinskis ◽  
Dalius Mažeika ◽  
Ramutis Bansevičius
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Piezoelectric Actuator ◽  
Contact Point ◽  
Piezoelectric Actuators ◽  
Excitation Voltage ◽  
Beam Type ◽  
Voltage Phase ◽  
Recent Trends ◽  
Feasible Solutions

The recent trends in robotics and mechatronics necessitate for developing small-size multi-DOF motion systems. Piezoelectric actuators are one of the feasible solutions of this problem. An investigation of the contact point multicomponent oscillations of the beam type piezoelectric actuator with two-directional polarizations under different excitation regimes is presented in the paper. Polarization of the actuator has perpendicular directions on the first and second half of the actuator. Two-directional polarization of the actuator is used to achieve flexural oscillations of the actuator in two perpendicular planes. Superposition of longitudinal and flexural modes allows achieving oscillations of contact point in different planes. Electrodes of the actuator are divided into sections, and several excitation schemes are used to control a trajectory of the contact point movement. Numerical simulation and experimental study of piezoelectric actuator oscillations were performed. Elliptical motions of the contact point were obtained in different planes. Dependencies of contact point oscillation trajectories from excitation voltage phase and amplitude are determined at different excitation regimes.

Energy Analysis of Piezoelectric-Actuated Structures Driven by Linear Amplifiers

1999 ◽  
Author(s):  
Donald J. Leo
Keyword(s):  
Energy Dissipation ◽  
Piezoelectric Actuator ◽  
Supply Voltage ◽  
Mechanical Load ◽  
Minimum Energy ◽  
Electromechanical System ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Additional Energy ◽  
Energy Dissipated

Abstract Energy expressions for a piezoelectric actuator coupled to a resonant mechanical load are analyzed for the purpose of determining the energy requirements of controlled structures. The analysis illustrates that the energy dissipated within the linear amplifier is a function of four parameters: the driving frequency, the piezoelectric coupling coefficient, the relative stiffness of the actuator and load, and the amplifier supply voltage. The piezoelectric actuator and the mechanical load are assumed to be lossless to highlight the relationship between energy dissipated within the amplifier and the energy stored in the actuator. For a specific frequency, the minimum energy dissipation within the amplifier is equal to twice the stored electrical energy in the piezoelectric when the amplifier voltage is equal to the driving voltage of the actuator. Additional energy is dissipated within the amplifier when the supply voltage is greater than the driving voltage. In the case when the actuator displacement is constant as a function of frequency, the energy dissipation in the amplifier decreases near the resonance of the coupled electromechanical system and reaches a minimum when the piezoelectric charge due to the applied voltage is equal and opposite to the charge induced by the load. The steady-state amplitude of the charge, and hence the actuator current, is equal to zero at this frequency. The results illustrate that energy dissipation is minimized when the actuator is operated at near the resonance or antiresonance of the coupled electromechanical system.

Development of a Charge Estimator for Piezoelectric Actuators

2020 ◽  
Vol 10 (1) ◽  
pp. 31-44
Author(s):  
Morteza Mohammadzaheri ◽  
Mohammadreza Emadi ◽  
Mojtaba Ghodsi ◽  
Issam M. Bahadur ◽  
Musaab Zarog ◽  
...  
Keyword(s):  
Piezoelectric Actuator ◽  
Basis Function ◽  
Voltage Drop ◽  
Piezoelectric Actuators ◽  
Operating Conditions ◽  
Radial Basis Function Networks ◽  
Excitation Voltage ◽  
Design Guideline ◽  
Constant Resistance ◽  
A Charge

Charge of a piezoelectric actuator is proportional to its displacement for a wide area of operating. Hence, a charge estimator can estimate displacement for such actuators. However, existing charge estimators take a sizable portion of the excitation voltage, i.e. voltage drop. Digital charge estimators have presented the smallest voltage drop. This article first investigates digital charge estimators and suggests a design guideline to (i) maximise accuracy and (ii) minimise the voltage drop. Digital charge estimators have a sensing resistor; an estimator with a constant resistance is shown to violate the design guideline; while, all existing digital charge estimators use one or a few intuitively chosen resistors. That is, existing estimators witness unnecessarily large inaccuracy and/or voltage drop. This research develops charge estimators with varying resistors, fulfilling the design guideline. Several methods are tested to estimates the sensing resistance based on operating conditions, and radial basis function networks models excel in terms of accuracy.

Vortex shedding and lock-on of a circular cylinder in oscillatory flow

1986 ◽  
Vol 170 ◽  
pp. 527-544 ◽  
Author(s):  
C. Barbi ◽  
D. P. Favier ◽  
C. A. Maresca ◽  
D. P. Telionis
Keyword(s):  
Circular Cylinder ◽  
Vortex Shedding ◽  
Oscillatory Flow ◽  
Published Data ◽  
Bluff Bodies ◽  
Driving Frequency ◽  
Frequency Limit ◽  
Mean Velocity ◽  
Shedding Frequency ◽  
Friction Measurements

An experimental study has been made of a circular cylinder in steady and oscillatory flow with non-zero mean velocity up to a Reynolds number of 40000. The results for the stationary cylinder are in close agreement with previously published data. Skin-friction measurements revealed the amplitude of fluctuation of the boundary layer for different angular locations. It has been universally accepted that bluff bodies shed vortices at their natural frequency of shedding (Strouhal frequency), or, when synchronized with an external unsteadiness, at the frequency of the disturbance or half of it, depending of the direction of the unsteadiness. Our findings, instead, indicate that the shedding frequency may vary smoothly with the driving frequency before locking on its subharmonic. Moreover, the present results indicate that, at the lowest frequency limit of lock-on, vortices are shed simultaneously on both sides of the model. A more traditional alternate pattern of vortex shedding is then recovered at higher driving frequencies.

Characterization of the Fracture Process of a Plate-Type Piezoelectric Composite Actuator under a Bending Load by Acoustic Emission Monitoring

2006 ◽  
Vol 326-328 ◽  
pp. 693-696
Author(s):  
Sung Choong Woo ◽  
Nam Seo Goo
Keyword(s):  
Acoustic Emission ◽  
Fracture Process ◽  
Fiber Composite ◽  
Maximum Load ◽  
High Amplitude ◽  
Piezoelectric Composite ◽  
Bending Load ◽  
Composite Actuator ◽  
Plate Type ◽  
Pzt Ceramic

Characteristics during the fracture process of a plate-type piezoelectric composite actuator (PCA) using acoustic emission (AE) monitoring were investigated under a bending load. The fracturing of a monolithic PZT ceramic shows typically brittle behavior; furthermore, the AE signal at the maximum load, which corresponds to the final fracture, has a high amplitude and long duration. Analysis of dominant frequency bands by a fast Fourier transform (FFT) in conjunction with AE parametric analysis expressed the characteristic changes of the fracture process in the PCA. For the PCA, a brittle fracture in a PZT ceramic layer induces the local delamination between the PZT ceramic and adjacent fiber composite layers. Based on the AE analysis and damage observations through optical microscopy, the features of AE associated with fracture process can be elucidated for the PCA.

scholarly journals A Novel Rotation-Structure Based Stick-Slip Piezoelectric Actuator with High Consistency in Forward and Reverse Motions

Actuators ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 189
Author(s):  
Jizhou Tang ◽  
Jingsong Wei ◽  
Yuming Wang ◽  
Zhi Xu ◽  
Hu Huang
Keyword(s):  
Piezoelectric Actuator ◽  
Piezoelectric Actuators ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Maximum Displacement ◽  
Stick Slip ◽  
Reverse Motion ◽  
Symmetric Structure ◽  
Deviation Rate ◽  
High Consistency

Under the same driving voltage and frequency, the forward and reverse motion inconsistency of stick-slip piezoelectric actuators would bring difficulty for subsequent control. To solve this problem, a rotation-structure based piezoelectric actuator with completely symmetric structure and two driving feet was initially proposed. By testing its output performances under various driving voltages and frequencies, it was confirmed that, although similar speeds could be achieved for forward and reverse motions, the maximum displacement and backward displacement in each step were still quite different. By analyzing the reasons leading to this difference, this actuator was further improved by using only one driving foot. The experimental results showed that the forward and reverse motion consistency of the improved actuator had been significantly improved. The deviation rate was only 1.6%, corresponding to a travel distance of 118.7 μm, obtained under the driving voltage of 100 V and driving frequency of 10 Hz. The comparison with some previously reported actuators further confirmed the advancement of this improved actuator.

scholarly journals 3D-Printed Miniature Robots with Piezoelectric Actuation for Locomotion and Steering Maneuverability Applications

Actuators ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 335
Author(s):  
Víctor Ruiz-Díez ◽  
José Luis García-Caraballo ◽  
Jorge Hernando-García ◽  
José Luis Sánchez-Rojas
Keyword(s):  
Large Scale ◽  
Driving Frequency ◽  
Piezoelectric Actuation ◽  
Miniature Robots ◽  
Differential Drive ◽  
3D Printed ◽  
Technological Impact ◽  
Hostile Environments ◽  
Complex Trajectories ◽  
Potential Use

The miniaturization of robots with locomotion abilities is a challenge of significant technological impact in many applications where large-scale robots have physical or cost restrictions. Access to hostile environments, improving microfabrication processes, or advanced instrumentation are examples of their potential use. Here, we propose a miniature 20 mm long sub-gram robot with piezoelectric actuation whose direction of motion can be controlled. A differential drive approach was implemented in an H-shaped 3D-printed motor platform featuring two plate resonators linked at their center, with built-in legs. The locomotion was driven by the generation of standing waves on each plate by means of piezoelectric patches excited with burst signals. The control of the motion trajectory of the robot, either translation or rotation, was attained by adjusting the parameters of the actuation signals such as the applied voltage, the number of applied cycles, or the driving frequency. The robot demonstrated locomotion in bidirectional straight paths as long as 65 mm at 2 mm/s speed with a voltage amplitude of only 10 V, and forward and backward precise steps as low as 1 µm. The spinning of the robot could be controlled with turns as low as 0.013 deg. and angular speeds as high as 3 deg./s under the same conditions. The proposed device was able to describe complex trajectories of more than 160 mm, while carrying 70 times its own weight.

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