scholarly journals Modeling and Compensation of a Bimorph Type Piezoelectric Actuator Exhibiting Odd-Harmonic Oscillation and Frequency-Dependent, Interleaved Hysteresis

Actuators ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 36
Author(s):  
Kohei Morita ◽  
Fumitake Fujii ◽  
Kazune Hosoda
Keyword(s):  
Piezoelectric Actuator ◽  
Harmonic Oscillation ◽  
Mathematical Structure ◽  
Signal Frequency ◽  
Original Play ◽  
Frequency Dependent ◽  
Input Signal Frequency ◽  
Fitness Index ◽  
Proposed Model ◽  
Peculiar Behavior

This paper proposes an improved version of the play model for capturing the frequency-dependent hysteresis of a bimorph piezoelectric actuator that includes odd harmonic oscillation and interleaved hysteresis. The proposed model used a single mathematical structure to capture the changes in the actuator response observed with the increase in the input signal frequency. The refinements on the structure of the original play model for capturing the peculiar behavior of the bimorph piezoelectric actuator have been addressed in detail. The parameter identification has been conducted extensively for a range of 1 Hz to 110 Hz, which exceeds the resonance frequency specified by the manufacturer of the actuator. Improved modeling accuracy was confirmed as compared with our previous enhanced Bouc–Wen model based on the calculation of the fitness index. We also attempted to synthesize a hysteresis compensator based on direct inverse multiplication; the results of the experimental validation of the proposed control system are disclosed.

scholarly journals A Bouc–Wen Model-Based Compensation of the Frequency-Dependent Hysteresis of a Piezoelectric Actuator Exhibiting Odd Harmonic Oscillation

Actuators ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 37 ◽  
Author(s):  
Fumitake Fujii ◽  
Ken’ichi Tatebatake ◽  
Kohei Morita ◽  
Takehiro Shiinoki
Keyword(s):  
Piezoelectric Actuator ◽  
Harmonic Oscillation ◽  
Frequency Dependent ◽  
Model Based

Design of Control System for Hydraulically Vibrated Processing Tomato Fruit Seedling Separation Device

2014 ◽  
Vol 651-653 ◽  
pp. 693-696
Author(s):  
Li Hong Wang ◽  
Rong Qing Liang ◽  
Cheng Song Li ◽  
Za Kan ◽  
Jin Wei Qin
Keyword(s):  
Tomato Fruit ◽  
Simulation Software ◽  
Signal Frequency ◽  
System Control ◽  
Frequency Range ◽  
Hydraulic Simulation ◽  
Separation Device ◽  
Processing Tomato ◽  
Input Signal Frequency ◽  
Set Up

Eccentric style processing tomato fruit seeding separation device exist high machining and assembly precision or other issues. In order to solve this problem, the mode of vibration of hydraulic replaced the eccentric style to drive the fruit seedling separation roller to separate processing tomato effectively. To facilitate adjustment of the hydraulic system, a kind of control circuit PLC as the core was designed according to the actual production requirements. PLC and other elements were selected. The system control signal frequency was initially set up as 1~5 HZ, within the frequency range hydraulic simulation software was used to simulate and analyze the hydraulic vibration system. The result shows that the system rams steady when the input signal frequency range was 1~5HZ.

SELF-TUNING BIQUAD BAND-PASS FILTER

2013 ◽  
Vol 22 (03) ◽  
pp. 1350008 ◽  
Author(s):  
GORAN JOVANOVIĆ ◽  
DARKO MITIĆ ◽  
MILE STOJČEV ◽  
DRAGAN ANTIĆ
Keyword(s):  
Dynamic Range ◽  
Signal Frequency ◽  
Band Pass Filter ◽  
Central Frequency ◽  
Pass Filter ◽  
Input Signal Frequency ◽  
Bicmos Technology ◽  
Self Tuning ◽  
Band Pass ◽  
Constant Bandwidth

One approach to design self-tuning gm-C biquad band-pass filter is considered in this paper. The phase control loop is introduced to force filter central frequency to be equal to input signal frequency what is achieved by adjusting the amplifier transconductance gm. Thanks to that, the filter is robust to parameter perturbations and it can be used as a selective amplifier. In the full tuning range, it has a constant maximum gain at central frequency as well as a constant bandwidth. The 0.25 μm SiGe BiCMOS technology was used during design and verification of the band-pass filter. The filter has 26 dB gain, quality factor Q = 20 and central frequency up to 150 MHz. Simulation results indicate that the total in-band noise is 59 μV rms , the output third intercept point OIP3 = 4.36 dB and the dynamic range is 35 dB. Maximal power consumption at 3 V power supply is 1.115 mW.

scholarly journals Reducing the Impact of the Frequency Change on the Formation of Orthogonal Components of the Relay Protection Input Signals

2020 ◽  
Vol 63 (1) ◽  
pp. 42-54 ◽  
Author(s):  
E. A. Romaniuk ◽  
V. Yu. Rumiantsev ◽  
Yu. V. Rumiantsev ◽  
A. A. Dziaruhina
Keyword(s):  
Fourier Transform ◽  
Discrete Fourier Transform ◽  
Digital Filter ◽  
Input Signal ◽  
Digital Filters ◽  
Signal Frequency ◽  
Filter Model ◽  
Input Signal Frequency ◽  
Orthogonal Components ◽  
The Impact

Digital filters made with the use of discrete Fourier Transform are applied in most microprocessor protections produced both in the home country and abroad. When the input signal frequency deviates from the value to which these filters are configured, a signal is generated at their output with oscillation amplitude that is proportional to the deviation of the signal frequency from the specified one. The article proposes an algorithm for compensating the oscillations of orthogonal components of the output signals of digital filters implemented on the basis of a discrete Fourier transform, when the input signal frequency deviates from the nominal one. A mathematical model of the proposed digital filter with an algorithm for compensating the oscillations of its orthogonal components, as well as a signal model for reproducing input effects, is implemented in the MatLab-Simulink dynamic modeling environment. The digital filter model is provided with two channels, viz. a current channel and a voltage channel, which makes it possible to simulate their operation in relation to protections that use one or two input values, for example, for current and remote protection. Verification of the functioning of the digital filter model with compensation for fluctuations in its output signal was carried out with the use of two types of test effects, viz. a sinusoidal signal with a frequency of 48–51 Hz (idealized effect), and the effects that are close to the real secondary signals of measuring current transformers and voltage transformers in case of short circuits accompanied by a decrease in frequency. The conducted computational experiments with deviation of frequency from the nominal one, revealed the presence of undamped oscillations at the output of standard digital Fourier filters and their almost complete absence in the proposed digital filters. This makes us possible to recommend digital filters based on a discrete Fourier transform supplemented by an algorithm for compensation of fluctuations in the amplitudes of the output signals for the use in microprocessor protection.

Strategies to Predict E-Commerce Inventory and Order Planning

2021 ◽  
pp. 212-226
Author(s):  
Mohammad Anwar Rahman ◽  
Laura Casanovas
Keyword(s):  
Rapid Growth ◽  
Mathematical Structure ◽  
Electronic Market ◽  
Customer Expectation ◽  
Online Marketplace ◽  
Customer Order ◽  
Main Challenge ◽  
Proposed Model ◽  
Potential Demand ◽  
Demand Projection

This study examines the characteristics of a prediction model for businesses in the online marketplace by considering the market trend, prior sales and decision maker's preference on potential demand estimate. With the rapid growth of the electronic market, the main challenge for online sellers is the ability to analyze customer expectation, market data, and sales information to make the accurate procurement decision. The proposed model integrates a mathematical structure for a target season sale comprising upcoming demand projection by seller's internal team, data from past sales and the overall trend of seller's e-brand to determine the online customer demand. The study proposed a newsvendor model as a tool for sellers to make the instantaneous decision of ordering merchandise from the supplier when the quick response to the customer order is a priority for electronic market. Results of the study provide insights into the procurement dynamics and implications of the e-commerce inventory plan.

Mechanism of Re-Scaling Frequency Stochastic Resonance Based on Kramers Rate and its Application

2010 ◽  
Author(s):  
Yong-gang Leng ◽  
Yan Guo
Keyword(s):  
Fault Diagnosis ◽  
Stochastic Resonance ◽  
Signal Frequency ◽  
Frequency Range ◽  
Excellent Performance ◽  
System Parameters ◽  
Frequency Scale ◽  
Input Signal Frequency ◽  
Scale Ratio ◽  
Rate Limit

We develop and further explore the mechanism of re-scaling frequency stochastic resonance (RFSR) based on the Kramers rate. We find that when the input signal frequency for stochastic resonance (SR) exceeds the half the Kramers rate limit, a frequency-scale ratio of RFSR should be selected to re-scale the larger signal frequency to a small SR frequency. Within the SR frequency range, we compare the performance of two approaches of realizing SR, the method of adjusting system parameters and the method of frequency-scale ratio. We showed that the former makes the half the Kramers rate approaching the signal frequency, while the latter makes the signal frequency approaching the half the Kramers rate. An engineering example demonstrates excellent performance of the re-scaling frequency for SR in fault diagnosis.

scholarly journals Basic Characteristics of IEC Flickermeter Processing

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Jarosław Majchrzak ◽  
Grzegorz Wiczyński
Keyword(s):  
Input Signal ◽  
Standard Test ◽  
Signal Frequency ◽  
Signal Source ◽  
Short Term ◽  
Voltage Fluctuations ◽  
Input Signal Frequency ◽  
A Value ◽  
Bandwidth Limitation ◽  
Basic Characteristics

Flickermeter is a common name for a system that measures the obnoxiousness of flicker caused by voltage fluctuations. The output of flickermeter is a value of short-term flicker severity indicator, . This paper presents the results of the numerical simulations that reconstruct the processing of flickermeter in frequency domain. With the use of standard test signals, the characteristics of flickermeter were determined for the case of amplitude modulation of input signal, frequency modulation of input signal, and for input signal with interharmonic component. For the needs of simulative research, elements of standard IEC flickermeter signal chain as well as test signal source and tools for acquisition, archiving, and presentation of the obtained results were modeled. The results were presented with a set of charts, and the specific fragments of the charts were pointed out and commented on. Some examples of the influence of input signal’s bandwidth limitation on the flickermeter measurement result were presented for the case of AM and FM modulation. In addition, the diagrams that enable the evaluation of flickermeter’s linearity were also presented.

scholarly journals The method of maximum plausibility in the problems of protection of the radio signal of unmanned aerial vehicles control

2020 ◽  
Vol 44 (4) ◽  
Author(s):  
S. I. Ganusyak ◽  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Radio Signal ◽  
Harmonic Oscillation ◽  
Radio Communication ◽  
Noise Interference ◽  
Communication Signal ◽  
Aerial Vehicles ◽  
Proposed Model ◽  
Method Of Maximum Likelihood ◽  
Aerial Vehicle

The paper considers the problem of protection of control of the radio signal of control of unmanned aerial vehicles as a task of control of signal parameters. The problem of control of a parameter of a radio signal and a problem of protection against interception by control of the unmanned aerial vehicle is formulated. The methods of estimating the parameters of the radio communication signal are analyzed and the method of estimating the parameters based on the method of maximum likelihood is proposed. This technique is demonstrated by estimating the phase of harmonic oscillation, which describes the radio signal and there are noise interference. Simulation modeling of the developed method is carried out, which confirmed the adequacy of the proposed model.

scholarly journals A computationally efficient model to capture the inertia of the piezoelectric stack in impact drive mechanism in the case of the in-pipe inspection application

2016 ◽  
Vol 7 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Jin Li ◽  
Chang Jun Liu ◽  
Xin Wen Xiong ◽  
Yi Fan Liu ◽  
Wen Jun Zhang
Keyword(s):  
Piezoelectric Actuator ◽  
Theoretical Development ◽  
Computationally Efficient ◽  
Pipe Inspection ◽  
Model Accuracy ◽  
Trade Off ◽  
Drive Mechanism ◽  
Proposed Model ◽  
Improved Performance ◽  
The Impact

Abstract. This paper presents a new model for the piezoelectric actuator (PA) in the context of in the impact drive mechanism (IDM) for the in-pipe inspection application. The feature of the model is capturing the inertia of PA stack in a distributed manner as opposed to the lumped manner in literature. The benefit arising from this feature is a balanced trade-off between computational efficiency and model accuracy. The study presented in this paper included both theoretical development (i.e. the model of the piezoelectric actuator and the model of the entire IDM which includes the actuator) and experimental verification of the model. The study has shown that (1) the inertia of the PA in such a robot will significantly affect the accuracy of the entire model of IDM and (2) the simulation of the dynamic behavior with the proposed model is sufficiently accurate by comparing with the experiment. It is thus recommended that the inertia of the PA be considered in the entire model of the IDM robot. The model is an analytical type, which has a high potential to be used for the model-based control of the IDM robot and optimization of its design for a much improved performance of the IDM system.

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