Dynamic Modeling and Output Characteristic Analysis of a Micro Bistable Piezoelectric Generator

2015 ◽  
Vol 645-646 ◽  
pp. 995-1003
Author(s):  
Xin Hua Mao ◽  
Qing He ◽  
Ting Ting Huang
Keyword(s):  
Electromechanical Coupling ◽  
Low Frequency ◽  
Nonlinear Behavior ◽  
Output Characteristic ◽  
Electromechanical Coupling Coefficient ◽  
Transfer Model ◽  
Characteristic Analysis ◽  
System A ◽  
Low Frequency Vibration ◽  
Piezoelectric Generator

For effectively harvesting the broadband and low-frequency vibration energies in real environment, a micro bistable piezoelectric generator, without containing magnet, is designed. On the basis of analysis the nonlinear behavior of the stiffness, damping and the electromechanical coupling coefficient about the bistable vibration system, a precise mechanical-electric transfer model is built. The output characteristic of the piezoelectric generator is simulated and tested. The results showed that the piezoelectric generator can effectively harvest the broadband and low frequency vibration energies. And the output voltage can meet the electricity demand of a wireless sensor network node. The structure of the piezoelectric generator does not contain magnets, and it is easy to realize miniaturization and integration.

Low frequency vibration suppression of a moderate thick cabin structure by multiple piezoelectric patches shunted with RL-double negative capacitance circuits

2021 ◽  
Vol 263 (5) ◽  
pp. 1299-1307
Author(s):  
Zhiwei Zheng ◽  
Feng Li ◽  
Xiuchang Huang ◽  
Zhiwei Su ◽  
Hongxing Hua
Keyword(s):  
Electromechanical Coupling ◽  
Vibration Suppression ◽  
Three Dimensional ◽  
Low Frequency ◽  
Electromechanical Coupling Coefficient ◽  
Double Negative ◽  
Low Frequency Vibration ◽  
Dimensional Finite Element ◽  
Trial And Error Method ◽  
Three Dimensional Finite Element

Multiple piezoelectric patches shunted with RL-double negative capacitances circuits, which are bonded on the bulkhead, are proposed to control the resonant response of multiple low frequency modes of a moderate thick cabin structure. Dynamic modeling of the electromechanical coupling system of the cabin structure and the piezoelectric shunt circuit is established by employing the three-dimensional finite element. Optimum tuning strategy is based on the trial and error method. It is shown that the proposed approach is effective in enhancing the generalized electromechanical coupling coefficient and controlling the low frequency modes that exhibits coupled deformation of the bulkhead and cabin structure.

Piezoelectric generator with nonlinear structure

2021 ◽  
pp. 146442072110086
Author(s):  
Liming Zhou ◽  
Yanbo Liu ◽  
Long Ma ◽  
Yue Wu
Keyword(s):  
Resonance Frequency ◽  
Low Frequency ◽  
Electrical Energy ◽  
Bending Vibration ◽  
Low Frequency Vibration ◽  
Piezoelectric Cantilever ◽  
Piezoelectric Generator ◽  
Ritz Procedure ◽  
Tip Mass ◽  
Euler Bernoulli Beam

Motion in nature is usually a low-frequency vibration such as walking, running, swinging arms, and so on, but traditional piezoelectric cantilever structures are inefficient at harvesting energy from low-frequency vibrations. T in the environment. To overcome this, a novel piezoelectric generator was designed. A cantilevered bimorph with a tip mass and a pair of preloading springs were fixed on its base to form a nonlinear piezoelectric generator. The energy transmission in the structure was analyzed. The harvester was modeled as a Euler–Bernoulli beam, and the piezoelectric material was assumed to be linear. The bending vibration was calculated using the Rayleigh–Ritz procedure, and the frequency characteristics of the output voltage were analyzed under different preloading distances. It was found that changing the preloading of the spring helped reduce the natural frequency of the cantilever, which facilitated conversion of ambient low-frequency vibrations into electrical energy. Then, the characteristics of low frequency energy harvesting were investigated experimentally. The theoretical results were consistent with the experimental data; moreover, the resonance frequency, which changes with the preloading distance, reduced from 43 to 35 Hz when the preloading distance was increased from 0 to 1 mm. In this paper, an effective structure to control the resonant frequency is proposed and its motion equation stated. The structure has potential for applications in predicting the effect of preloading distance on resonance frequency.

The Characteristic Analysis of Double Vibration Isolation Model Based on MRF and Piezoceramics

2012 ◽  
Vol 246-247 ◽  
pp. 1309-1313
Author(s):  
De Sheng Zhang ◽  
Guo Tian He ◽  
Ming Li ◽  
Li Song
Keyword(s):  
High Frequency ◽  
Shear Force ◽  
Vibration Isolation ◽  
Rapid Development ◽  
Low Frequency ◽  
Process Technology ◽  
Characteristic Analysis ◽  
Ultralow Frequency ◽  
Model Based ◽  
Low Frequency Vibration

with the rapid development of ultraprecise process technology, the precision of instrument is being improved fast. Then instruments are more sensitive to the vibration of environment. This paper took advantage of the controlled character of MRF’s shear force, using actuators made of PZT,and put forward the double vibration isolation model based on MRF and piezoceramics. Through the theoretical analysis we arrival at a conclusion that the model has a good Isolation effect on both high frequency vibration and low frequency vibration especially ultralow frequency vibration.

Nonlinear Dynamics in Drilling and Boring Operations Assisted by Low Frequency Vibration

2007 ◽  
Author(s):  
George F. Moraru
Keyword(s):  
Nonlinear Dynamics ◽  
Harmonic Balance ◽  
Low Frequency ◽  
Harmonic Balance Method ◽  
Nonlinear Behavior ◽  
Drilling Process ◽  
Process Damping ◽  
Regenerative Effect ◽  
Low Frequency Vibration ◽  
Machining System

The nonlinear dynamics of the drilling process assisted by self-excited axial vibrations is analyzed. Models are developed and discussed, including regenerative effect and various phenomena contributing to the process damping in drilling and boring operations. Stability and bifurcation analysis, using several assumptions on the damping in the cutting process, are carried out using linear analysis tools or simulations. A simple predictive model based on a harmonic balance method is presented. Behavior charts are constructed using simulations. Hypothesis on the nature of the process damping and nonlinear behavior of the machining system are proved by experiments. A possible application to the gundrilling boring process in aircraft drilling and assembly process is presented.

OPTIMIZATION OF A PIEZOELECTRIC GENERATOR OF FLEXURAL VIBRATIONS WITH AN ACTIVE PIEZOMAGNETIC LAYER BASED ON A COMBINATION OF THE FINITE ELEMENT METHOD AND A GENETIC ALGORITHM

2021 ◽  
pp. 11-17
Author(s):  
Thаnh Binh Do
Keyword(s):  
Genetic Algorithm ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Steel Substrate ◽  
Optimal Choice ◽  
Geometric Parameters ◽  
Electromechanical Coupling Coefficient ◽  
Storage Device ◽  
Piezoelectric Generator ◽  
Electromechanical Conversion

The construction of the piezoelectric generator (PEG) for the energy storage device has a significant effect on the electromechanical conversion characteristics, and the optimal choice of its geometric parameters is an important prerequisite for ensuring efficiency of the electromechanical conversion. This article discusses a PEG model based on circular three-layer plate in the ANSYS package. Two piezoactive layers, piezoelectric and piezomagnetic, are glued to a steel substrate. The program built in the MATLAB package allows to control ANSYS scripts to find the dependence of the electromechanical coupling coefficient on the geometric parameters of the object. The genetic algorithm is used to determine the maximum value of the electromechanical coupling coefficient when changing the radius and thickness of the layers within certain limits. Thus, a set of geometric dimensions is determined to achieve the best PEG energy conversion efficiency. After applying the optimization algorithm, the electromechanical coupling coefficient increases by 34% in comparison with the results of previous studies.

Modelling and validation of a seat suspension with rubber spring for off-road vehicles

2017 ◽  
Vol 24 (18) ◽  
pp. 4110-4121 ◽  
Author(s):  
Leilei Zhao ◽  
Yuewei Yu ◽  
Changcheng Zhou ◽  
Fuxing Yang
Keyword(s):  
Vibration Isolation ◽  
Ride Comfort ◽  
Low Frequency ◽  
Model Parameters ◽  
Seat Suspension ◽  
System A ◽  
Low Frequency Vibration ◽  
New Type ◽  
Suspension Model ◽  
Better Than

To improve seat performance of low-frequency vibration isolation, this paper investigates a new type of seat suspension with a hollow composite rubber spring. To better describe the real system, a nonlinear suspension model was built. Then, the model parameters were identified and validated, the results show that the model is workable and the identified parameters are acceptable. The acceleration transmissibility of the new suspension was also analyzed by test and simulation. The resonant frequencies measured are close to the simulated under different excitation amplitudes, and all the relative deviations of the resonant frequency are less than 2.0%. Finally, in order to make clear how much the new suspension is better than the traditional suspension with the coil spring, the comparison of ride comfort was conducted under different working conditions. The results show that the new suspension can more effectively attenuate the low frequency from the uneven ground, meanwhile, it can provide a more stable support so that the driver can control the vehicle effectively. The model proposed can be used to predict the performance of the new seat suspension. The new suspension and the model provide a valuable reference for broadening the type of the seat suspension and exploring the optimal performance.

A Study on the Fine Structure of the Lateral Line Organ of the Sea Eel

1973 ◽  
Vol 31 ◽  
pp. 648-649
Author(s):  
K. Hama
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Lateral Line ◽  
Low Frequency ◽  
Sensory Cells ◽  
Apical Surface ◽  
Voltage Electron ◽  
Sensory Epithelia ◽  
Low Frequency Vibration ◽  
Transmission Electron

The lateral line organs of the sea eel consist of canal and pit organs which are different in function. The former is a low frequency vibration detector whereas the latter functions as an ion receptor as well as a mechano receptor.The fine structure of the sensory epithelia of both organs were studied by means of ordinary transmission electron microscope, high voltage electron microscope and of surface scanning electron microscope.The sensory cells of the canal organ are polarized in front-caudal direction and those of the pit organ are polarized in dorso-ventral direction. The sensory epithelia of both organs have thinner surface coats compared to the surrounding ordinary epithelial cells, which have very thick fuzzy coatings on the apical surface.

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