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Статті в журналах з теми "Electromechanical performance"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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1

Schlegel, Holger, Arvid Hellmich, Kevin Hipp, Johannes Quellmalz, and Reimund Neugebauer. "Improved Controller Performance for Electromechanical Axes." Solid State Phenomena 251 (July 2016): 113–19. http://dx.doi.org/10.4028/www.scientific.net/ssp.251.113.

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Анотація:

The cascaded position control structure is state of the art in modern production machines and machine tools. Since an adequate controller performance of the electromechanical axes is still a key aspect for a resource efficient and high-quality production, this topic is addressed by the paper. An overall approach/framework to monitor and ensure an improved controller performance over time, comprising five tangible approaches is presented. All methodologies were developed in the department for control and feedback control technologies of the Technische Universitaet Chemnitz. They will be demonstrated and also be discussed based on experimental results.

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2

Rogers, Geoffrey W., and Jefferson Z. Liu. "High-Performance Graphene Oxide Electromechanical Actuators." Journal of the American Chemical Society 134, no. 2 (December 23, 2011): 1250–55. http://dx.doi.org/10.1021/ja2096199.

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3

Zheng, Shicheng, Yongling Fu, Deyi Wang, Wensen Zhang, and Junlin Pan. "Investigations on system integration method and dynamic performance of electromechanical actuator." Science Progress 103, no. 3 (July 2020): 003685042094092. http://dx.doi.org/10.1177/0036850420940923.

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Анотація:

A highly integrated electromechanical actuator was developed in this article, which aims at fulfilling the requirements of high power-to-weight ratio, high efficiency, high integration and low volume in military equipment. Three different transmission schemes were proposed for the integrated electromechanical actuator according to the differences in integration methods. Comparative analysis was conducted on the specific structures of the integrated electromechanical actuator and the categories and performance of the planetary roller screw, which is the key unit of the integrated electromechanical actuator. An integrated electromechanical actuator was designed based on the project requirements. A mathematical model was established and the system transfer function was derived. Based on this, a simulation model of the position loop system was established using the AMESim software and the effects of some related parameters, such as friction, backlash and stiffness, on the dynamic performance of the system were investigated. The related theory and simulation results were experimentally validated by a self-developed integrated electromechanical actuator research prototype combined with the related test system. The data obtained from the step response tests, sinusoidal response tests and repeat locating accuracy tests indicated that the developed integrated electromechanical actuator prototype is of rapid, accurate and stable position tracking capability.

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4

Zhang, Kai, Wu Zhao, and Chun Sheng Zhou. "Knowledge Support Technology of Creative Design for Electromechanical Products." Advanced Materials Research 139-141 (October 2010): 1148–53. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1148.

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Анотація:

It has been discussed in this paper that the necessity of knowledge support technology used in creative design of electromechanical products. In order to apply knowledge support technology to creative design of electromechanical products, a relation matrix has been constructed by QFD (Quality Function Deployment) technology between the various performances of electromechanical products and the involved knowledge of them. Thus, the HOQ (House of Quality) about the knowledge–performance of electromechanical products is built. Then, the further demand tracking has been made as well. After that, it has been established that the knowledge model and knowledge application process used in creative design of electromechanical products. Finally, a new method has been proposed which can guide designers to do product creative design by knowledge demand.

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5

Ismagilov, F., V. Vavilov, and D. Farrakhov. "Research the Properties of Temperature High-Coercivity Permanent Magnets NdFeB." Materials Science Forum 870 (September 2016): 8–12. http://dx.doi.org/10.4028/www.scientific.net/msf.870.8.

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The article addresses the issue of improving the accuracy of power electromechanical systems design. The performance of power electromechanical systems relies on the performance of permanent magnets used, which is nonlinearly dependent on temperature. It is shown that the calculation error introduced by this nonlinearity cannot be described accurately enough with one equation. It is also shown that the performance of thermally unstable magnets can degrade abruptly at a certain temperature, which causes additional and unpredictable decrease in electromechanical system’s performance.

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6

Zakladnyi, Oleh Oleksandrovych, and Yevhenii Hennadiiovych Bryzhitskyi. "RESEARCH IMPACTS ON ENERGY PERFORMANCE ELECTROMECHANICAL SYSTEMS." POWER ENGINEERING: economics, technique, ecology, no. 1 (May 13, 2016): 89–96. http://dx.doi.org/10.20535/1813-5420.1.2016.68828.

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7

Cui, Han Jing, Chuan Zheng Zhu, and Lei Wang. "Performance Assessment Model for Highway Electromechanical System." Advanced Materials Research 706-708 (June 2013): 892–96. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.892.

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Анотація:

Based on the research of the law of performance of electrical and mechanical equipments, the characteristics of highway electromechanical system is studied. According to current quality inspection and evaluation standards, the hierarchy criteria system is deduced, and the importance degree of each criterion is calculated according to the responses on the question form by Delphi method. By membership functions, each criterion is given the weight which is normalized as the importance degree for the hierarchy level. Then, the fuzzy comprehensive assessment model is established with judgment matrix.

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8

Lu, Chao, Quanzhang Huang, and Xi Chen. "High-performance silicon nanocomposite based ionic actuators." Journal of Materials Chemistry A 8, no. 18 (2020): 9228–38. http://dx.doi.org/10.1039/d0ta01604g.

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9

Akyel, Ahmet, Yusuf Tavil, Abdurrahman Tufan, Cagri Yayla, Arif Kaya, Mehme Engin Tezcan, Mehmet Akif Ozturk, and Bulent Boyaci. "Atrial Electromechanical Delay and Diastolic Dysfunction in Primary Sjögren Syndrome." Clinical & Investigative Medicine 35, no. 5 (October 6, 2012): 303. http://dx.doi.org/10.25011/cim.v35i5.18703.

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Purpose: In this study we aimed to investigate myocardial function and atrial electromechanical properties by conventional and tissue doppler echocardiography in patients with primary Sjögren syndrome. Methods: Forty patients with Sjögren syndrome (SS) and 25 age- and sex-matched healthy volunteers were enrolled in the study. Using transthoracic echocardiography, myocardial performance index and atrial electromechanical properties were measured. Results: Basal characteristics were similar between two groups. Myocardial performance index values were disturbed in patients with Sjögren syndrome (0.41 vs. 0.32, p < 0.01). There was significant intraatrial (16.4±6.4, 5.0±4.5, p < 0.01) and interatrial (30.6±10.1, 15.4±5.9, p < 0.01) electromechanical delay in this patient group. Conclusion: Myocardial function is disturbed and there is significant atrial electromechanical delay in patients with primary SS. This study is the first to show altered myocardial function and atrial electromechanical properties in primary SS.

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10

Plashyansky, Leonid, and Maria Reshetnyak. "High-performance coal mining shearer loader electromechanical systems." Energy Safety and Energy Economy, no. 3 (June 2019): 17–21. http://dx.doi.org/10.18635/2071-2219-2019-3-17-21.

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11

Kondo, Noriaki. "Unique electromechanical performance of myocardium from hibernating chipmunks." Japanese Journal of Pharmacology 39 (1985): 131. http://dx.doi.org/10.1016/s0021-5198(19)63431-1.

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12

Levi, E., Z. Zabar, and L. Birenbaum. "Basic performance of flux-compression/expansion electromechanical converters." IEEE Transactions on Plasma Science 20, no. 5 (October 1992): 554–61. http://dx.doi.org/10.1109/27.163593.

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13

Zhang, Junshi, and Hualing Chen. "Electromechanical performance of a viscoelastic dielectric elastomer balloon." International Journal of Smart and Nano Materials 5, no. 2 (March 25, 2014): 76–85. http://dx.doi.org/10.1080/19475411.2014.893930.

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14

Woodburn, David, Thomas Wu, Lei Zhou, Yang Hu, Yeong-Ren Lin, Louis Chow, and Quinn Leland. "High-Performance Electromechanical Actuator Dynamic Heat Generation Modeling." IEEE Transactions on Aerospace and Electronic Systems 50, no. 1 (January 2014): 530–41. http://dx.doi.org/10.1109/taes.2013.120338.

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15

Altınkaya, Emine, Yoldaş Seki, Özgün Cem Yılmaz, Levent Çetin, Okan Özdemir, İbrahim Şen, Kutlay Sever, Barış Oğuz Gürses, and Mehmet Sarıkanat. "Electromechanical performance of chitosan-based composite electroactive actuators." Composites Science and Technology 129 (June 2016): 108–15. http://dx.doi.org/10.1016/j.compscitech.2016.04.019.

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16

Palosaari, J., J. Juuti, E. Heinonen, V. P. Moilanen, and H. Jantunen. "Electromechanical performance of structurally graded monolithic piezoelectric actuator." Journal of Electroceramics 22, no. 1-3 (March 2, 2008): 156–62. http://dx.doi.org/10.1007/s10832-008-9440-3.

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17

Pan, Dalei, Shenjie Gu, Guangyue Guo, Hongbo Kuang, Hua Zhong, and Feng Gao. "The optimization methodology research on the motion performances of the driving device of main steam and feed water isolation valves." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 6 (March 9, 2017): 1069–78. http://dx.doi.org/10.1177/0954406217698722.

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Анотація:

The driving device of the main steam and feed water isolation valves is one of the most important electromechanical equipment in nuclear power plants, and its motion performances are related to the safety of nuclear power plants. This article proposes an optimization methodology to research the motion performances. In the methodology, inputs are the motion performance indexes and the major influencing parameters with no need for complex mathematical models of the electromechanical equipment; the co-simulation model or the prototype are adopted to illustrate the influence rules of major parameters on the motion performance indexes; objective functions for optimization, which combine motion performances with weight factors, can reveal the influence rule curves. Then based on the methodology, motion performances of the equipment are analyzed and the key indexes are selected. Besides, the maximum pressure of the driving device is chosen as the major parameter and a dimensionless objective function synthesizing the motion performance indexes is proposed. Finally, the influence rule curve where the dimensionless function varies with the maximum pressure is obtained by the co-simulation and the experimental study on the prototype verifies the results, which provides references for the further research and development in the engineering application. For other electromechanical equipment, the method is an efficient tool to design, verify, and optimize the performances.

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18

Cheng, Xin, Shuang Shuang Liao, Shi Feng Huang, and Li Li Guo. "Influence of Base Thickness on Performance of 1-3-2 Piezoelectric Composite." Advanced Materials Research 123-125 (August 2010): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.121.

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Sulphoaluminate cement and Lead Niobium-Magnesium Zirconate Titanate ceramic [P(MN)]ZT were used as matrix and functional phase respectively to fabricate 1-3-2 cement-based piezoelectric composites by dice and filling technique. The influences of base thickness on piezoelectric properties, electromechanical properties and acoustic impedance properties of the composites were discussed. The results show that as the base thickness increases, the piezoelectric stain factor d33 increases gradually, while the piezoelectric voltage factor g33 decreases. The planar electromechanical coupling coefficient Kp exhibits the trend of decrease, while the thickness electromechanical coupling coefficient Kt and acoustic impedance show the increasing trend. The mechanical quality factor Qm reaches the minimum (1.49) when base thickness is 2.00 mm. The results reveal that the 1-3-2 piezoelectric composite will be suitable for application by changing the base thickness.

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19

Liu, Yu Xin, and Xu Jia. "Common Problem Analysis in Electromechanical Equipments of Highway External Field." Applied Mechanics and Materials 387 (August 2013): 332–36. http://dx.doi.org/10.4028/www.scientific.net/amm.387.332.

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Electromechanical system is the main auxiliary system for expressway traffic facilities and the main tool to implement modern management. In this paper electrical safety performance and environmental adaptation performance were introduced first. Then highway external field electromechanical equipments were recommended. This may give some references to electrical and mechanical equipment design, production and construction.

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20

Ma, Baoqi, Zhenping Wan, Zhibiao Hu, Zhantong Li, Chongyang Han, Zhiheng Zeng, Zefeng Zheng, Ting Tang, and Weibin Wu. "Application of Simulation Software in Optimization of Powertrain of Pure Electric Vehicle." International Journal of Emerging Technology and Advanced Engineering 10, no. 11 (November 30, 2020): 42–55. http://dx.doi.org/10.46338/ijetae1120_05.

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— Pure electric vehicles are a research hotspot in today's new energy vehicle industry. Its core is the electromechanical coupled drive system (drive motor and gearbox), and its performance affects the overall performance of pure electric vehicles. The application of industrial software for electromagnetic design, electrothermal design, electromagnetic vibration and noise optimization of drive motors, heat transfer analysis, fatigue analysis, and noise optimization analysis of gearboxes has become important technologies for designing and manufacturing the core components of electromechanical coupling drive systems.This article analyzes the current status and existing problems of the development of simulation software for the core components (drive motor and gearbox) of the electromechanical coupling drive system of electric vehicles, and proposes solutions to key technical problems, and proposes the development direction of unified simulation of drive motor and gearbox on the electromechanical coupling platform

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21

Zhou, Liping. "Load balance control method of multi electromechanical transmission system based on dynamic programming." Journal of Physics: Conference Series 2085, no. 1 (November 1, 2021): 012005. http://dx.doi.org/10.1088/1742-6596/2085/1/012005.

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Abstract Controlling the load balance of multi electromechanical transmission system is the core and difficulty of metro vehicles. In order to effectively control the load of multi electromechanical transmission system and ensure the load balance of multi electromechanical transmission system. A load balancing control method of multi electromechanical transmission system based on dynamic programming is proposed. By designing the structure of the transmission system filter, the low DC resonant frequency of the inverter is maintained and the grid harmonics with higher order effect are suppressed. The rotor field oriented correction method based on dynamic programming can improve the torque performance of traction electric drive system, control the DC side active damping oscillation, and realize the load balance control of multi electromechanical drive system. The simulation results show that the proposed method avoids the wrong rise of multi electromechanical voltage and the saturation of regulator output caused by inaccurate magnetic field orientation, can effectively control the load of multi electromechanical transmission system, ensure the load balance of multi electromechanical transmission system, and provide an effective reference for the load balance control of multi electromechanical transmission system.

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22

Chen, Yin Jun, Qing Hua Chen, Yan Mei Li, and Wen Gang Wu. "Coupled-Field Finite Element Analysis of MEMS Compound Electrostatic Actuator by Using the ANSYS Software." Applied Mechanics and Materials 214 (November 2012): 929–34. http://dx.doi.org/10.4028/www.scientific.net/amm.214.929.

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MEMS (Microelectromechanical Systems) electrostatic actuators have been successfully applied in a number of areas, including accelerometers, gyroscopes, pressure sensors, and optical devices. In this paper, the actuator optimization of a silicon bulk-micro machined MEMS compound electrostatic actuator of an optical device is discussed. The actuator uses folded-beam structure to enhance the electromechanical performance. The movable block is connected to the compound electrostatic actuator through unequal-height folded-beam springs. The lower-height springs connect the block with parallel plates, and can convert the descending motion of the plates into out-of-plane tilting motion of the block efficiently Additionally, the block is capable of in-plane motion by applying the driving force of the comb-drive actuator through structural connection. ANSYS FEM simulation is used to extract the device electromechanical performance and resonant frequency of the device. By gradually varying the design parameters in ANSYS simulation, the relationship between the actuator electromechanical performance and various design parameters is derived. The curves of actuator electromechanical performance versus beam length and beam height are derived and they are in good agreement with theoretical prediction. From the analysis it is concluded that the actuator behavior strongly depends upon various actuator parameters. By adjusting design parameters, desired electromechanical performance can be obtained. Based on the simulation results, a set of optimized design parameters for the compound electrostatic actuator is decided. The above-proposed MEMS compound electrostatic actuator may be used for many applications, such as optical device and micro-operating.

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23

Ye, Zuo-Guang. "High-Performance Piezoelectric Single Crystals of Complex Perovskite Solid Solutions." MRS Bulletin 34, no. 4 (April 2009): 277–83. http://dx.doi.org/10.1557/mrs2009.79.

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AbstractRelaxor-based single crystals of complex perovskite solid solutions, Pb(Mg1/3Nb2/3)O3–PbTiO3 [PMN–PT] and Pb(Zn1/3Nb2/3)O3–PbTiO3 [PZN–PT], exhibit extraordinary piezoelectric performance, with extremely high piezoelectric coefficients, very large electromechanical coupling factors, and exceptionally high strain levels. These materials outperform the currently used Pb(Zr1–xTix)O3 [PZT] ceramics, making them the materials of choice for the next generation of electromechanical transducers for a broad range of advanced applications. In this article, recent major advances in the development of piezocrystals are reviewed in terms of crystal growth, piezoelectric properties, crystal chemistry, domain structure, and device applications.

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24

WOO, SUNG-CHOONG, and NAM SEO GOO. "MONITORING OF FAILURE MECHANISMS IN A COMPOSITE BENDING ACTUATOR DURING CYCLIC LOADING BY ACOUSTIC EMISSION." International Journal of Modern Physics B 24, no. 15n16 (June 30, 2010): 2339–44. http://dx.doi.org/10.1142/s0217979210064897.

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The objective of this work is to investigate the influence of electromechanical cyclic loading on the performance of a bending piezoelectric composite actuator. We have analyzed the fatigue damage mechanisms in terms of the behavior of the AE event rate. It was found that whether the actuators are subjected to purely electric loading or electromechanical loading, the initial fatigue damage of the bending piezoelectric composite actuator was caused by the transgranular fracture in the PZT ceramic layer; the final failure was caused only in the case of PCAWB under electromechanical loading by a local discharge, which critically affected the performance reduction of the actuators. As the number of cycles increased, a large reduction in displacement performance coincided with a high AE event rate, which was identified via microscopic observations.

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25

Zhang, Xiaojun, Man Wang, Manhong Li, Minglu Zhang, and Chengwei Zhang. "Fabrication of Macroporous Nafion Membrane from Silica Crystal for Ionic Polymer-Metal Composite Actuator." Processes 8, no. 11 (October 31, 2020): 1389. http://dx.doi.org/10.3390/pr8111389.

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Nafion membrane with macropores is synthesized from silica crystal and composited with Pt nanoparticles to fabricate macroporous ionic polymer-metal composite (M-IPMC) actuator. M-IPMC shows highly dispersed small Pt nanoparticles on the porous walls of Nafion membrane. After the electromechanical performance test, M-IPMC actuator demonstrates a maximum displacement output of 19.8 mm and a maximum blocking force of 8.1 mN, far better than that of IPMC actuator without macroporous structure (9.6 mm and 2.8 mN) at low voltages (5.8–7.0 V). The good electromechanical performance can be attributed to interconnected macropores that can improve the charge transport during the actuation process and can allow the Pt nanoparticles to firmly adsorb, leading to a good electromechanical property.

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26

Zhang, Mingyue, Man Zhou, Hui Liu, Baiqiang Zhang, Yulian Zhang, and Hairong Chu. "Friction compensation and observer-based adaptive sliding mode control of electromechanical actuator." Advances in Mechanical Engineering 10, no. 12 (December 2018): 168781401881379. http://dx.doi.org/10.1177/1687814018813793.

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The performance of the electromechanical actuator system is usually affected by the nonlinear friction torque disturbance, model uncertainty, and unknown disturbances. In order to solve this problem, a model-based friction compensation method combined with an observer-based adaptive sliding mode controller for the speed loop of electromechanical actuator system is presented in this article. All the disturbances and model uncertainty of electromechanical actuator system are divided into two parts. One is model-based friction torque disturbance which can be identified by experiments, and the other is the residual disturbance which cannot be identified by experiments. A modified LuGre model is adopted to describe the friction torque disturbance of electromechanical actuator system. An extended state observer is designed to estimate the residual disturbance. An adaptive sliding mode controller is designed to control the system and compensate the friction torque disturbance and the residual disturbance. The stability of the electromechanical actuator system is discussed with Lyapunov stability theory and Barbalat’s lemma. Experiments are designed to validate the proposed method. The results demonstrate that the proposed control strategy not only provides better disturbance rejecting ability but also provides better steady state and dynamic performance.

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27

He, Dan, Yunchuan Xie, Xiao Wang, and Zhicheng Zhang. "Significantly Enhanced Electromechanical Performance of PDMS Crosslinked PVDF Hybrids." Polymers 10, no. 7 (June 29, 2018): 714. http://dx.doi.org/10.3390/polym10070714.

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28

Gilchrist, Kristin H., David E. Dausch, and Sonia Grego. "Electromechanical performance of piezoelectric scanning mirrors for medical endoscopy." Sensors and Actuators A: Physical 178 (May 2012): 193–201. http://dx.doi.org/10.1016/j.sna.2012.02.029.

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29

Li, Peng, Zhigang Gao, Jun Zhou, and Jiaolong Zhang. "High Fidelity Modeling Method of High Performance Electromechanical Actuator." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 36, no. 1 (February 2018): 7–12. http://dx.doi.org/10.1051/jnwpu/20183610007.

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Анотація:

The accuracy of high performance electromechanical actuator(EMA) system model has important influence on the simulation accuracy of aircraft guidance and control loop. Aiming at solving the deficiency in the reflection of EMA characteristics using traditional second-order model, a high-fidelity global coupling modular structure modeling method is proposed. Based on the analysis of the modeling process, high-fidelity modeling research is conducted on "BLDCM/ball screw/fork" type EMA systems. The structure of high fidelity model is investigated, and modeling methods of nonlinear factors such as servo motor, transmission ratio, mechanical inertia and transmission flexibility in the system are examined in detail. Simulation results based on simulink platform show that the high fidelity model established by this method is highly consistent with the actual system performance of the input-output characteristics and the internal state characteristics, ensuring the authenticity of the system model, which plays an important effect on improving the simulation accuracy of the aircraft guidance and control loop.

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30

Meng, Qingyuan, M. Mehregany, and K. Deng. "Modeling of the electromechanical performance of piezoelectric laminated microactuators." Journal of Micromechanics and Microengineering 3, no. 1 (March 1, 1993): 18–23. http://dx.doi.org/10.1088/0960-1317/3/1/005.

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31

Lian, Yuanfeng, Yuexian Liu, Tao Jiang, Jing Shu, Huiqin Lian, and Minhua Cao. "Enhanced Electromechanical Performance of Graphite Oxide-Nafion Nanocomposite Actuator." Journal of Physical Chemistry C 114, no. 21 (May 13, 2010): 9659–63. http://dx.doi.org/10.1021/jp101337h.

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32

Van So, Pham, Jangkwen Lee, Sanghun Shin, and Jaichan Lee. "ELECTROMECHANICAL PERFORMANCE OF PIEZOELECTRIC ACTUATORS IN INKJET PRINT HEAD." Integrated Ferroelectrics 98, no. 1 (June 13, 2008): 251–58. http://dx.doi.org/10.1080/10584580802131932.

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33

Jin, Huawei, Huanyu Huo, Chuanli Wang, Shun Wang, and Huwei Xu. "Design and experimental study of electrical and mechanical brake for mine hoist." Mechanics & Industry 22 (2021): 36. http://dx.doi.org/10.1051/meca/2021033.

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Анотація:

To meet the requirement of the braking response of the coal mine hoist, a new electromechanical braking technology for mine hoists is proposed, the principle of electromechanical braking of mine hoists is demonstrated, and the detailed parameters and braking performance of electromechanical brakes are given. Index, an electromechanical brake test platform with large load and high response is developed. Experiments show that the maximum positive pressure of the designed electromechanical brake reaches 33 KN, which meets the requirement of positive pressure of mine hoist. The braking error is less than 10 %, and the braking gap elimination time is less than 0.1 s. There is a linear relationship between motor current input and brake positive pressure output, with a slope of 4.17 and an intercept of 0.62. The screw displacement output and the brake pressure output have a cubic relationship, and the zero error is small. Through research, a new idea is provided for the development of electromechanical brakes for coal mine hoist.

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34

Chen, Chao, Li Yang, Xingan Jiang, Xiaokun Huang, Xiaoyi Gao, Na Tu, Kaizheng Shu, Xiangping Jiang, Shujun Zhang, and Haosu Luo. "Ultrahigh Electromechanical Coupling and Its Thermal Stability in (Na1/2Bi1/2)TiO3-Based Lead-Free Single Crystals." Crystals 10, no. 6 (May 29, 2020): 435. http://dx.doi.org/10.3390/cryst10060435.

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In this work, we report the ultrahigh electromechanical coupling performance of NBT-6BT-KNN lead-free single crystal at room temperature. The thickness mode electromechanical coupling coefficient (kt) and the 31 mode electromechanical coupling coefficient (k31) reach 69.0% and 45.7%, respectively, which are superior to the PZT-5H lead-based ceramics of kt~60% and k31~39%. In addition, the evolution of the crystal structure and domain morphology is revealed by Raman scattering spectra, a polarizing microscope and piezoelectric force microscopy characterization.

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Lu, Guangtao, Qi Wang, Huijun Song, Zhe Liu, and Tao Wang. "Actuating Performance Analysis of a New Smart Aggregate Using Piezoceramic Stack." Applied Sciences 11, no. 20 (October 15, 2021): 9599. http://dx.doi.org/10.3390/app11209599.

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A new type of smart aggregate using piezoceramic stack (SAPS) was developed for improved output, as compared with a conventional smart aggregate with a single piezoceramic patch. Due to the better output, the proposed smart aggregate is preferred where the attenuating effect is strong. In this research, lead zirconate titanate (PZT) material in the form of discs was used due to its strong piezoelectric performance. For analysis, the proposed SAPS was simplified to a one-dimensional axial model to investigate its electromechanical and displacement output characteristics, and an experimental setup was designed to verify the simplified model. Moreover, the influence of the structural parameters, including the number of the PZT discs, the dimensions of the PZT disc, protective shell, and copper lids, and the elastic modulus of the epoxy on the electromechanical and displacement output performance of SAPSs, were numerically studied by using the one-dimensional axial model. The numerical analysis results indicate that the structural dimension of the PZT discs has a greater effect on the electromechanical performance of SAPSs than that of the protective shell and copper lids. Moreover, the results show that the number of the PZT discs and the outer diameter of the protective shell have a much greater influence on the displacement output of SAPSs than other parameters. The analysis results of SAPSs with different elastic moduli of the epoxy demonstrate that the SAPSs’ first resonance frequency, first electromechanical coupling factor, and displacement output change less than 1.79% when the epoxy’s elastic modulus changes from 1.28 GPa to 5.12 GPa, which indicates that the elastic modulus of the epoxy has a limited influence on the property of SAPSs, and it will be helpful for their fabrication. This study provides an approach to increasing the output of SAPS and also develops a method to design the structure of SAPSs.

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Kuznetsova, V. N., and R. V. Romanenko. "Basic aspects of methodology for justifying the performance characteristics of a tracked machine with electromechanical transmission." Russian Automobile and Highway Industry Journal 17, no. 5 (November 11, 2020): 574–83. http://dx.doi.org/10.26518/2071-7296-2020-17-5-574-583.

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Introduction. High rates of new territories development, the development of the construction and road-transport complex, mining and transportation of minerals is impossible without machinery and equipment. The use of a caterpillar propeller as a base chassis has both advantages and disadvantages. One of the main problems is ensuring the mobility of tracked vehicles. The use of mixed-type power units and transmissions allows solving this scientific problem and ensuring the efficiency of technological operations during the operation of tracked vehicles. Modern vehicles use a variety of transmission types, including electromechanical transmission (EMT). In such a design, torque conversion and change in the speed of the drive wheels of the caterpillar propulsion device are carried out by means of traction electric motors (TEM). The aim of the use of electromechanical transmission in tracked machines is to increase the tractive-dynamic properties and fuel economy and, as a result, to improve the mobility of the machine. The combination of an internal combustion engine (ICE) and electric machines in a caterpillar machine (CM) makes it possible to maximize the advantages of the latter and compensate for the disadvantages of each. These improvements are achieved mainly through the different performance characteristics of the traction electric engine (TEE) and the energy storage device (ESD).Research methods. A system analysis served as the basis for the theoretical studies. A mathematical model of the motion of a tracked vehicle with an electromechanical transmission has been developed. The methods of the theory of algorithms were used.Results. A structural diagram of the arrangement of a series connection of elements of an electromechanical transmission of a tracked vehicle, protected by a patent of the Russian Federation, has been developed and presented. An algorithm has been developed for the interaction of its elements taking into account the movement of the machine. The main mathematical relationships included in the methodology for substantiating the operational characteristics of a tracked vehicle with an electromechanical transmission are presented.Discussion and conclusion. Using the developed approaches and methodology, it will be possible to calculate the components of the electromechanical transmission in order to ensure the required mobility of the caterpillar machine, to assess its fuel economy, as well as its maximum and average speed.

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Hanse Wampo, F. L., R. P. Lemanle Sanga, P. Maréchal, and G. E. Ntamack. "Piezocomposite transducer design and performance for high resolution ultrasound imaging transducers." International Journal of Computational Materials Science and Engineering 08, no. 03 (September 2019): 1950013. http://dx.doi.org/10.1142/s2047684119500131.

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Piezocomposite design for dedicated ultrasonic imaging applications requires precise homogenization models for predicting the electromechanical characteristics of the new material. Thus, several homogenization models have been developed. As part of this work, we applied several analytical homogenization models for piezocomposite of 2–2 and 1–3 connectivities. To validate these analytical models, a comparative study was made between various models and experimental measurements. As a result, these homogenized electromechanical properties are effectively used for the calculation and comparison of electroacoustic response for typical transducers aimed at ultrasound imaging applications. An optimal design of transducer aimed at ultrasound imaging applications is proposed as a dedicated imaging performance index, elaborated through a trade-off between sensitivity and bandwidth.

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Dimino, Ignazio, Federico Gallorini, Massimiliano Palmieri, and Giulio Pispola. "Electromechanical Actuation for Morphing Winglets." Actuators 8, no. 2 (May 15, 2019): 42. http://dx.doi.org/10.3390/act8020042.

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As a key enabler for future aviation technology, the use of servo electromechanical actuation offers new opportunities to transition innovative structural concepts, such as biomimicry morphing structures, from basic research to new commercial aircraft applications. In this paper, the authors address actuator integration aspects of a wing shape-changing flight surface capable of adaptively enhancing aircraft aerodynamic performance and reducing critical wing structural loads. The research was collocated within the Clean Sky 2 Regional Aircraft Demonstration Platform (IADP) and aimed at developing an adaptive winglet concept for green regional aircraft. Finite Element-based tools were employed for the structural design of the adaptive device characterized by two independent movable tabs completely integrated with a linear direct-drive actuation. The structural design process was addressed in compliance with the airworthiness needs posed by the implementation of regional airplanes. Such a load control system requires very demanding actuation performance and sufficient operational reliability to operate on the applicable flight load envelope. These requirements were met by a very compact direct-drive actuator design in which the ball recirculation device was integrated within the screw shaft. Focus was also given to the power-off electric brake necessary to block the structure in a certain position and dynamically brake the moveable surface to follow a certain command position during operation. Both the winglet layout static and dynamic robustness were verified by means of linear stress computations at the most critical conditions and normal mode analyses, respectively, with and without including the integrated actuator system.

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Tugui, Codrin, George T. Stiubianu, Manole S. Serbulea, and Maria Cazacu. "Silicone dielectric elastomers optimized by crosslinking pattern – a simple approach to high-performance actuators." Polymer Chemistry 11, no. 19 (2020): 3271–84. http://dx.doi.org/10.1039/d0py00223b.

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Bai, Wangfeng, Peng Zheng, Fei Wen, Jingji Zhang, Daqin Chen, Jiwei Zhai, and Zhenguo Ji. "Lead-free BNT-based composite materials: enhanced depolarization temperature and electromechanical behavior." Dalton Transactions 46, no. 44 (2017): 15340–53. http://dx.doi.org/10.1039/c7dt02846f.

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The development of (Bi_0.5Na_0.5)TiO₃-based solid solutions with both high depolarization temperature T_d and excellent piezoelectric and electromechanical properties for practical application is intractable because improved thermal stability is usually accompanied by a deterioration in piezoelectric and electromechanical performance.

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Xi, Yan, and Qin Xing. "Automatic Electromechanical Control System Based on PLC Technology." Journal of Physics: Conference Series 2143, no. 1 (December 1, 2021): 012037. http://dx.doi.org/10.1088/1742-6596/2143/1/012037.

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Abstract With the continuous progress of science and technology, China is transforming into the field of industrial automation, striving to contribute to the liberation of labor force and the realization of assembly line industrial automation. The operation of the traditional automatic electromechanical control system(AECS) still needs a lot of manual operation, which is difficult to realize the development of all automation of electromechanical control. The new AECS proposed at present is to realize the automation, intelligent and remote control of electromechanical control system, and truly take the control system as the center for electromechanical control production.Therefore, this paper puts forward the design and application of AECS based on PLC technology. Through research, this paper expounds the AECS based on PLC technology and its application. PLC technology can realize automation and integrated control in system control, compact structure, and can accommodate the conversion of many digital signals to realize its control function of the system, study the software design of AECS, mainly design the input interface and output interface. In order to understand the application and performance of PLC technology in automatic electromechanical system, this paper compares and analyzes the fuzzy PID control error of PLC technology and the performance of AECS based on PLC technology with traditional AECS. The experimental results show that in the comparative analysis of simulation experiments between the performance of AECS based on PLC technology and traditional AECS, the proportion coefficient of traditional AECS is 1.63, the integral time constant is -1.06, and the differential time constant is 0.29, while the proportion coefficient of AECS based on PLC technology is 0.56, the integral time constant is 0.37 and the differential time constant is 1.18. The deviation of AECS based on PLC technology is smaller than that of traditional automatic electromechanical control, and the static error is also smaller, but its response speed is faster and its performance is better.

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Qiao, Guan, Geng Liu, Zhenghong Shi, Yawen Wang, Shangjun Ma, and Teik C. Lim. "A review of electromechanical actuators for More/All Electric aircraft systems." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 22 (December 28, 2017): 4128–51. http://dx.doi.org/10.1177/0954406217749869.

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Conventional hydraulic actuators in aircraft systems are high maintenance and more vulnerable to high temperatures and pressures. This usually leads to high operating costs and low efficiency. With the rapid development of More/All Electric technology, power-by-wire actuators are being broadly employed to improve the maintainability, reliability, and manoeuvrability of future aircraft. This paper reviews the published application and development of the airborne linear electromechanical actuator. First, the general configuration, merits, and limitations of the gear-drive electromechanical actuator and the direct-drive electromechanical actuator are analysed. Second, the development state of the electromechanical actuator testing systems is elaborated in three aspects, namely the performance testing based on room temperature, testing in a thermal vacuum environment, and iron bird. Common problems and tendencies of the testing systems are summarized. Key technologies and research challenges are revealed in terms of fault-tolerant motor, high-thrust mechanical transmission, multidisciplinary modelling, thermal management, and thermal analysis. Finally, the trend for future electromechanical actuators in More/All Electric Aircraft applications is summarized, and future research on the airborne linear electromechanical actuators is discussed.

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Tao, Jin Ling, Hui Jin, Wei Song Yuan, and Hui Yan Chen. "Design on the Electromechanical Shift Mechanism of AMT." Applied Mechanics and Materials 88-89 (August 2011): 355–59. http://dx.doi.org/10.4028/www.scientific.net/amm.88-89.355.

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According to the performance characteristic of the shift system of AMT, the design requirements of electromechanical shift mechanism are developed, and the electromechanical shift mechanism of AMT for the off-road vehicle is designed. Based on the shift force and shift time, parameters of selection and shift operating mechanism are designed. The mechanism is analyzed by FEA software, affording theoretical principle for the structure improvement and its final design. The test result proves that the electromechanical shift mechanism is reasonable and feasible of the application of AMT system.

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Lokarev, Valentyn. "PERFORMANCE CHARECTERISTICS FORMULATION OF UNCONVENTIONAL MATHEMATICAL ASYNCHRONOUS ELECTRIC DRIVE." Science Journal Innovation Technologies Transfer, no. 2019-3 (July 7, 2019): 85–91. http://dx.doi.org/10.36381/iamsti.3.2019.85-91.

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A new mathematical formulation of the performance characteristics of asynchronous electric drives, mechanical ω(M) and electromechanical I(M) ones, has been considered. They are widely used in engineering practice and educational process of higher educational institutions when designing and studying industrial electromechanisms. The article aim is to increase the amount of computational tools for the formulation of motor electromagnetic properties, enhance their form and structure in order to improve the accuracy and performance of the computational process. The method of performing the work is a divergence from the conventional mathematical formulation of the performance characteristics of asynchronous electric drives, the search for new more efficient forms in terms of the objectives. The new mathematical formulation of the performance characteristics of asynchronous electric drives is obtained by bringing the known formulas of Kloss and Shubenko to the relative values, replacing the slip with a system value and performing a series of mathematical transformations. At this, the total number of formulas for calculating the performance characteristics doubled. Two groups of formulas were developed: with one independent variable ν(m) and i (m) and with two variables ν(m, i) and i (m, ν). The first group of formulas is independent and self-sufficient. Mechanical ν(m) and electromechanical i (m) characteristics are based on the motor passport data. The formulas for their calculation contain repetitive elements, do not require to involve other characteristics, that determines an effective and productive calculation. The mechanical characteristics can be constructed using the second group of formulas, if electromechanical one is known and vice versa. All the obtained formulas differ from the traditional ones by the uniformity of structure and form and close interaction, so any mechanical characteristics can be constructed by electromechanical and vice versa. As well as the original traditional formulas, the new formulas perfectly describe the working areas of characteristics, but can make significant errors in the starting ranges. In order to eliminate this disadvantage, the correction of the formulas was performed. The basic formulas are used when calculating the working areas, and the corrected ones — at starting ranges. The results of the work can be used in engineering practice and educational process of higher educational institutions when designing and studying industrial electromechanisms.

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Wang, Hong Lei, Dong Xiang, and Guang Hong Duan. "Design for Saving Energy Based on Energy Flow Analysis Method and CAE Technology." Key Engineering Materials 419-420 (October 2009): 329–32. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.329.

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This paper presents the design method of electromechanical products for saving energy based on energy flow analysis. The energy transfer model and energy correlation model are built through analyzing the relation of energy flow and products performance in order to address the conflict between energy saving and performance optimization. Based on the energy transfer model, the performance pertinences and performance margins of electromechanical products are analyzed with CAE technology and value engineering theory. Finally, the split air-conditioner’s outdoor unit is studied and the design method for saving energy based on energy flow analysis is adopted to solve the conflict between air flow increasing and noise reduction.

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Sheng, Jun Jie, Yu Qing Zhang, Shu Yong Li, and Hua Ling Chen. "Temperature Influence on the Viscoelastic Electromechanical Deformation of Dielectric Elastomer." Advanced Materials Research 1052 (October 2014): 137–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1052.137.

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Temperature can significantly affect the performance of a viscoelastic dielectric elastomer (DE). In the current study, we use a thermodynamic model to characterize the influence of temperature on the viscoelastic electromechanical response undergoing a constant electric load by taking into account the temperature dependent elastic modus and dielectric constant. Due to the significant viscoelasticity in the dielectric elastomer, DE membrane creeps in time and the inelastic stretch of DE is smaller than that of the total stretch. The results show that the total stretch of the viscoelastic electromechanical deformation increases with the increasing temperature until suffering electromechanical instability at a high temperature; the actuation performance is dominated by the moduli of the elastomer. This may be used to guide the design of dielectric elastomer actuators undergoing temperature variation.

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Llaneras, Robert E., Robert W. Swezey, and John A. Allen. "Motion as an Instructional Feature in Maintenance Training." Proceedings of the Human Factors Society Annual Meeting 33, no. 19 (October 1989): 1305–9. http://dx.doi.org/10.1177/154193128903301915.

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This paper draws upon both an extensive review of the literature, and a series of experiments manipulating motion-based (videotaped) versus static (35-mm slide) presentations of instructional material across a variety of instructional conditions. Performance measures in the experiments included both hands-on tasks and conceptual knowledge tests. Results indicated that electromechanical maintenance performance did not differ significantly between statically and dynamically trained groups across a variety of types and complexities of electromechanical maintenance tasks and instructional strategy conditions.

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Zhang, Zhicheng, Xiao Wang, Shaobo Tan, and Qing Wang. "Superior electrostrictive strain achieved under low electric fields in relaxor ferroelectric polymers." Journal of Materials Chemistry A 7, no. 10 (2019): 5201–8. http://dx.doi.org/10.1039/c8ta11938d.

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A relaxor ferroelectric polymer exhibits record electromechanical performance, including the largest electrostrain of −13.4%, the highest elastic energy density of 3.1 J cm⁻³ and the best energy conversion efficiency of 0.5, among the known ferroelectric polymers. Notably, the excellent electromechanical responses are realized under much lower fields than those of ferroelectric polymers.

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Gu, Yousong, Xuhui Yang, Yilin Guan, Max A. Migliorato, and Yue Zhang. "Enhanced electromechanical performance in metal–MgO–ZnO tunneling diodes due to the insulator layers." Inorganic Chemistry Frontiers 3, no. 9 (2016): 1130–36. http://dx.doi.org/10.1039/c6qi00159a.

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Li, Chenchen, Shifu Liu, Hongduo Zhao, and Yu Tian. "Performance Assessment and Comparison of Two Piezoelectric Energy Harvesters Developed for Pavement Application: Case Study." Sustainability 14, no. 2 (January 13, 2022): 863. http://dx.doi.org/10.3390/su14020863.

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To advance the development of piezoelectric energy harvesters, this study designed and manufactured bridge-unit-based and pile-unit-based piezoelectric devices. An indoor material testing system and accelerated pavement test equipment were used to test the electrical performance, mechanical performance, and electromechanical coupling performance of the devices. The results showed that the elastic modulus of the pile structure device was relatively higher than that of the bridge structure device. However, the elastic modulus of the two devices should be improved to avoid attenuation in the service performance and fatigue life caused by the stiffness difference. Furthermore, the electromechanical conversion coefficients of the two devices were smaller than 10% and insensitive to the load magnitude and load frequency. Moreover, the two devices can harvest 3.4 mW and 2.6 mW under the wheel load simulated by the one-third scale model mobile load simulator, thus meeting the supply requirements of low-power sensors. The elastic modulus, electromechanical conversion coefficients, and electric performance of the pile structure device were more reliable than those of the bridge structure device, indicating a better application prospect in road engineering.

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