Статті в журналах: "Electromechanical chain"

1

Zhou, Fangyi. "Analysis of the Impact of the United States' Decoupling of Trade with China on the Global Value Chain Division of China's Mechanical and Electrical Industry." Highlights in Business, Economics and Management 28 (April 9, 2024): 453–57. http://dx.doi.org/10.54097/51c8xa43.

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This article matches the cases of China US trade frictions to various sub sectors of the electromechanical industry, considers the comparative advantage index of heterogeneous product quality, and uses regression analysis to simulate different scenarios of tariffs. It directly affects the participation of Chinese electromechanical products in the global value chain division of labor, and provides reasonable suggestions for maintaining the comparative advantage position of the electromechanical industry in the global division of labor. The conclusion of this article is as follows: 1. The decoupling and chain breaking measures taken by the United States towards China have had an impact on China's global value chain division of labor in the electromechanical industry, and overall have suppressed its comparative advantage position; 2. The decoupling and chain breaking measures have a more significant impact on the global value chain division of labor in the electromechanical industry in recent times; 3. It is suggested to timely promote measures to extend, strengthen, and supplement the supply chain, and build a unified national factor market to mitigate the negative impact of the United States' decoupling and block chain measures.

2

Zurita-Millán, Daniel, Miguel Delgado-Prieto, Juan José Saucedo-Dorantes, Jesus Adolfo Cariño-Corrales, Roque A. Osornio-Rios, Juan Antonio Ortega-Redondo, and Rene de J. Romero-Troncoso. "Vibration Signal Forecasting on Rotating Machinery by means of Signal Decomposition and Neurofuzzy Modeling." Shock and Vibration 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/2683269.

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Vibration monitoring plays a key role in the industrial machinery reliability since it allows enhancing the performance of the machinery under supervision through the detection of failure modes. Thus, vibration monitoring schemes that give information regarding future condition, that is, prognosis approaches, are of growing interest for the scientific and industrial communities. This work proposes a vibration signal prognosis methodology, applied to a rotating electromechanical system and its associated kinematic chain. The method combines the adaptability of neurofuzzy modeling with a signal decomposition strategy to model the patterns of the vibrations signal under different fault scenarios. The model tuning is performed by means of Genetic Algorithms along with a correlation based interval selection procedure. The performance and effectiveness of the proposed method are validated experimentally with an electromechanical test bench containing a kinematic chain. The results of the study indicate the suitability of the method for vibration forecasting in complex electromechanical systems and their associated kinematic chains.

3

Wang, Zhong-Xia, and Wei-Qiang Liao. "Giant electromechanical effects in polymers." Science 375, no. 6587 (March 25, 2022): 1353–54. http://dx.doi.org/10.1126/science.abn7440.

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4

Wang, Jing. "Green Supply Chain for Electromechanical Engineering of Rail Transit." IOP Conference Series: Earth and Environmental Science 576 (November 12, 2020): 012030. http://dx.doi.org/10.1088/1755-1315/576/1/012030.

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5

Ignat, Mircea, and George Zarnescu. "The Nano and Micromanipulators Based on Magnetic Bacterium." Advances in Science and Technology 58 (September 2008): 177–82. http://dx.doi.org/10.4028/www.scientific.net/ast.58.177.

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The paper present a type of nano and manipulators which are based on structure of the magnetic bacterium, which is described. There are presented a theoretical study and analisys of the micromechanic circuit with elastic and damper elements, the micromagnetic circuit ( with micromagnetic specific characteristics) and also the electromechanic analogy aspects of the magnetic bacterium. The authors propose some nano and micromanipulators based on the structure of the chain of magnetic bacterium which include the nano or micro magnetic particles. The calculus, electromechanical modeling and experiments of this nano or microstructure what work and in the fluid medium are presented. There are evidenced the possible aspects on microrobotics and application field.

6

Zhang, Genbao, and Yang Wang. "Reliability Modeling of Electromechanical System with Meta-Action Chain Methodology." Mathematical Problems in Engineering 2018 (2018): 1–14. http://dx.doi.org/10.1155/2018/8547141.

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To establish a more flexible and accurate reliability model, the reliability modeling and solving algorithm based on the meta-action chain thought are used in this thesis. Instead of estimating the reliability of the whole system only in the standard operating mode, this dissertation adopts the structure chain and the operating action chain for the system reliability modeling. The failure information and structure information for each component are integrated into the model to overcome the given factors applied in the traditional modeling. In the industrial application, there may be different operating modes for a multicomponent system. The meta-action chain methodology can estimate the system reliability under different operating modes by modeling the components with varieties of failure sensitivities. This approach has been identified by computing some electromechanical system cases. The results indicate that the process could improve the system reliability estimation. It is an effective tool to solve the reliability estimation problem in the system under various operating modes.

7

Callanan, J., C. L. Willey, V. W. Chen, J. Liu, M. Nouh, and A. T. Juhl. "Uncovering low frequency band gaps in electrically resonant metamaterials through tuned dissipation and negative impedance conversion." Smart Materials and Structures 31, no. 1 (November 16, 2021): 015002. http://dx.doi.org/10.1088/1361-665x/ac3434.

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Abstract A new class of electromechanically coupled metamaterial is presented which relies on magnetic field interactions between the host structure and a local resonator circuit to realize novel vibration control capabilities. The metamaterial chain exhibits a highly tunable vibration band gap which can be easily placed at a desired frequency using the resonant circuit parameters, providing a robust mechanism to independently alter the band gap width, depth, and frequency of maximum attenuation. In its dissipative form, the electromechanical metamaterial is shown to exhibit electrical metadamping as a function of the local resonance circuit resistance. The impact of the damping ratio as a function of the electrical resistance is characterized in frequency and time domains, and related to the infinite system dynamics. A robust experimental realization of the system is constructed which achieves electromechanical coupling through a moving coil and magnet system. The apparatus is used to show that the band gap location and depth can be readily tuned with the circuit elements. The presented metamaterial has potential for meaningful vibroacoustic practical applications in addition to revealing fundamentally new properties of damped electrically-resonant structures.

8

He, Hua Bo, and Ke Wang. "Behavioral Characteristics of Electromechanical Products and Their Representation Based on a Modified Petri Net." Applied Mechanics and Materials 37-38 (November 2010): 222–25. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.222.

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Behavioral characteristic is one of the important targets in conceptual design and re-design of electromechanical products. To summarize the knowledge of behavior characteristics of electromechanical products, this paper proposed the concepts of behavioral effect, elemental behavior and behavioral chain. It made the modification to classical Petri nets, then analyzed and expressed the behavior characteristics using the modified Petri nets. Finally, a case study of an electric nail-gun was conducted to demonstrate the feasibility of the proposed methodologies.

9

Cohen, Noy, and Gal deBotton. "The electromechanical response of polymer networks with long-chain molecules." Mathematics and Mechanics of Solids 20, no. 6 (September 19, 2014): 721–28. http://dx.doi.org/10.1177/1081286514550574.

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10

Yusuf, Yusril, Shigehiro Hashimoto, P. E. Cladis, Helmut R. Brand, Simon Krause, Heino Finkelmann, and Shoichi Kai. "Main Chain Liquid-Crystalline Elastomers: Swelling Dynamics and Electromechanical Effects." Molecular Crystals and Liquid Crystals 508, no. 1 (September 11, 2009): 367/[729]—379/[741]. http://dx.doi.org/10.1080/15421400903065903.

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11

Grasinger, Matthew, and Kaushik Dayal. "Statistical mechanical analysis of the electromechanical coupling in an electrically-responsive polymer chain." Soft Matter 16, no. 27 (2020): 6265–84. http://dx.doi.org/10.1039/d0sm00845a.

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Polymers that couple deformation and electrostatics have potential application in soft sensors and actuators for robotics and biomedical technologies. This paper applies statistical mechanics to study their coupled electromechanical response.

12

Hegedűs, György, and Sándor Apáti. "Investigation and simulation of a scotch yoke mechanism." Multidiszciplináris Tudományok 13, no. 2 (December 15, 2023): 144–52. http://dx.doi.org/10.35925/j.multi.2023.2.13.

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This paper studies the electromechanical model of a jigsaw mechanism. The jigsaw is powered by a battery, which drives a DC motor. The rotational motion is converted into linear motion through a Scotch Yoke mechanism. The electromechanical equations are based on energy approach using the Lagrange-equation. The Lagrange function contains the energies of the model, i.e., the kinetic co-energy of the kinematic chain and the magnetic co-energy of the inductance. As regard the non-conservative elements their virtual works are written. The formulated equations of the jigsaw model allow us to examine this force-energy relationship.

13

Füvesi, V., and E. Kovács. "Separation of faults of electromechanical drive chain using artificial intelligence methods." International Review of Applied Sciences and Engineering 4, no. 1 (June 1, 2013): 35–41. http://dx.doi.org/10.1556/irase.4.2013.1.5.

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Abstract In this paper a complex drive chain is modelled with Local Linear Neuro-Fuzzy Model (LLNF). The developed models were used for detecting different faults that may occur in the system. The models were developed based on measurements carried out on the real system. Using feed-forward neural networks with perceptron neuron structure, model-based fault diagnosis of the analysed system was developed to separate the different faults. The performance and efficiency of the developed different types of artificial neural network's structures were compared using gradient based edge detection method.

14

Chaibet, Ahmed, Cherif Larouci, and Moussa Boukhnifer. "A Hybrid Electric Vehicle Transmission Chain Simulator Based on Electromechanical Actuators." Journal of Asian Electric Vehicles 9, no. 2 (2011): 1537–42. http://dx.doi.org/10.4130/jaev.9.1537.

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15

Maré, Jean-Charles. "Practical Considerations in the Modelling and Simulation of Electromechanical Actuators." Actuators 9, no. 4 (September 25, 2020): 94. http://dx.doi.org/10.3390/act9040094.

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The work reported here was aimed at improving the practical efficiency of the model-based development and integration of electromechanical actuators. Models are proposed to serve as preliminary design, virtual prototyping, and validation. The first part focuses on the early phases of a project in order to facilitate the identification of modelling needs and constraints, and to build a top-level electromechanical actuator model for preliminary studies and sub-specification. Detailed modelling and simulation are then addressed with a mixed view on the control, power capability, and thermal balance. Models for the power chain are firstly considered by focusing on the key practical issues in modelling the electric motor, power electronics, and mechanical power transmission. The same logic is applied to the signal and control chain with practical considerations concerning the parameters of the controller, its digital implementation, the sensors, and their signal conditioning. Numerous orders of magnitude are provided to justify the choices made and to facilitate decision-making for and through simulation activities.

16

Gendvilienė, Vida, Irma Martišienė, Danguolė Zablockaitė, and Jonas Jurevičius. "Effect of inhibitors of mitochondrial respiratory chain complexes on the electromechanical activity in human myocardium." Medicina 46, no. 10 (October 11, 2010): 679. http://dx.doi.org/10.3390/medicina46100096.

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The aim of the study was to investigate the effect of inhibitors of mitochondrial respiratory chain complexes I, III, and IV on the electromechanical activity in human myocardium. Material and methods. The experiments were performed on the human myocardial strips obtained from patients with heart failure (NYHA class III or IV) using a conventional method of registration of myocardial electromechanical activity. Under the perfusion with physiological Tyrode solution (control), contraction force (P) was 0.94±0.12 mN (n=16), relaxation time (t50) was 173.38±5.03 ms (n=15), action potential durations measured at 50% (AP50) and 90% (AP90) repolarization were 248.96±13.38 ms and 398.59±17.93 ms, respectively (n=13). Results. The inhibition of respiratory chain complex I by rotenone (3×10–5 M, the highest concentration applied) decreased contraction force of human myocardium to 48.99%±14.74% (n=3) (P<0.05); AP50, to 81.34%±15.81%; and AP90, to 87.28%±7.25% (n=3) (P>0.05) of control level, while relaxation time and resting tension remained almost unchanged. Antimycin A, an inhibitor of complex III, applied at the highest concentration (3×10–4 M) reduced P to 41.66%±8.8% (n=5) (P<0.001) and marginally increased t50 and decreased the durations of AP. Anoxia (3 mM Na2S2O4) that inhibits the activity of complex IV reduced the contraction force to 9.23%±3.56% (n=6) (P<0.001), AP50 and AP90 to 65.46%±9.95% and 71.07%±8.39% (n=5) (P<0.05) of control level, respectively; furthermore, the resting tension augmented (contracture developed). Conclusions. Our results show that the inhibition of respiratory chain complex IV had the strongest inhibitory effect on the electromechanical activity of failing human myocardium.

17

Liu, Canchang, Chicheng Ma, Zhichang Qin, and Changcheng Zhou. "Lateral vibration analysis of monatomic chains considering atomic longitudinal displacement." Journal of Low Frequency Noise, Vibration and Active Control 38, no. 2 (February 12, 2019): 457–72. http://dx.doi.org/10.1177/1461348419828606.

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The lateral vibration of monatomic chains considering atomic longitudinal displacements is studied by using the string vibration theory. The modes of lateral vibration of monatomic chains are assumed as the modes of string vibration. Based on the string assumption, the equation of string vibration for monatomic chains is established. Coordinates of the vibration atoms can be calculated by utilizing boundary conditions and symmetry conditions of monatomic chains. The natural angular frequencies of transverse vibration of monatomic chains are calculated by the string vibration method. The tension of the quantum limitation is given and the value of limitation can be used to distinguish nanoelectromechanical systems from quantum-electromechanical Systems. Natural angular frequencies and resonant frequencies of the monatomic chain string are associated with the axial tension acting on the string and the length of monatomic chains, and they can be altered by changing the length of the string and the axial tension acting on the string. The nonlinear vibration of single atomic chain can be analyzed using the improved Lindstedt–Poincaré multiscale method. The study found that the stiffness of the carbon monatomic chain can be altered by changing the length of the string and the tension acting on the string.

18

Hiraoka, Kazuyuki, Toyohisa Kishimoto, Masayuki Kato, and Tohru Tashiro. "Electroclinic and electromechanical effects of a side-chain chiral smectic A elastomer." Liquid Crystals 38, no. 4 (April 15, 2011): 489–93. http://dx.doi.org/10.1080/02678292.2011.552744.

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19

Mao, Jie, Tiefeng Li, and Yingwu Luo. "Significantly improved electromechanical performance of dielectric elastomers via alkyl side-chain engineering." Journal of Materials Chemistry C 5, no. 27 (2017): 6834–41. http://dx.doi.org/10.1039/c7tc01221g.

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20

Itskov, Mikhail, Vu Ngoc Khiêm, and Sugeng Waluyo. "Electroelasticity of dielectric elastomers based on molecular chain statistics." Mathematics and Mechanics of Solids 24, no. 3 (February 21, 2018): 862–73. http://dx.doi.org/10.1177/1081286518755846.

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The mechanical response of dielectric elastomers can be influenced or even controlled by an imposed electric field. It can, for example, cause mechanical stress or strain without any applied load; this phenomenon is referred to as electrostriction. There are many purely phenomenological hyperelastic models describing this electroactive response of dielectric elastomers. In this contribution, we propose an electromechanical constitutive model based on molecular chain statistics. The model considers polarization of single polymer chain segments and takes into account their directional distribution. The latter results from non-Gaussian chain statistics, taking finite extensibility of polymer chains into account. The resulting (one-dimensional) electric potential of a single polymer chain is further generalized to the (three-dimensional) network potential. To this end, we apply directional averaging on the basis of numerical integration over a unit sphere. In a special case of the eight-direction (Arruda–Boyce) model, directional averaging is obtained analytically. This results in an invariant-based electroelastic constitutive model of dielectric elastomers. The model includes a small number of physically interpretable material constants and demonstrates good agreement with experimental data, with respect to the electroactive response and electrostriction of dielectric elastomers.

21

Tymofieieva, O. "INVESTIGATION OF THE TEMPERATURE FACTORS INFLUENCE ON OPERATING SAFETY THE SUBMERSIBLE ELECTROMECHANICAL CONVERTER." Municipal economy of cities 1, no. 161 (March 26, 2021): 328–33. http://dx.doi.org/10.33042/2522-1809-2021-1-161-328-333.

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The article presents a mathematical model of the thermal field for determining the values of temperatures during the submersible electromechanical converter operation. The influence of obtained temperature values on the safety and reliability of the submersible electromechanical converter is analyzed. In a submersible electromechanical converter the windings temperature has great importance. On the one hand, the windings temperature must be such as to transfer a sufficient amount of heat to the viscous loading environment for its processing (movement, transportation, etc.) to begin. On the other hand, the windings temperature must not exceed the limit values for the corresponding insulation class, since this can cause an emergency (fire, short circuit, etc.) The obtained results shows, that temperature on the surface of rotor's cylinders reaches 135 ° C, which provides rapid heating of a viscous substance, and therefore high performance of the pumping process. In this work, the bitumen BND 200/300 was used as the loading and cooling environment. The flash point of this brand of bitumen is 220 ° C and characterizes the degree of flammability of bitumen when it heated. Bitumen does not reach the maximum allowable temperature as a result of heating by means of submersible electromechanical converter that creates a safe temperature corridor in a technological chain at its processing. The temperature of the outer surface of the submersible electromechanical converter, with which the service technical staff may have a contact, does not exceed 20 ° C (Fig. 3), which is completely safe and does not endanger the workers health or life. Also, the obtained temperatures values are within the permissible limits of the heat resistance class of a winding electrical insulating material (H - 180 ° C), which also contributes to the safe submersible electromechanical converter operation.

22

Sood, Bhanu, and Paula M. George. "G-19 Update: Management of Testing and Inspection Data Generated from Counterfeit Parts Inspection." EDFA Technical Articles 14, no. 2 (May 1, 2012): 28–29. http://dx.doi.org/10.31399/asm.edfa.2012-2.p028.

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Abstract Counterfeit electronic parts have become a significant cause of concern in the electronics part supply chain. Several factors that contribute to the targeting of the electrical, electronic, and electromechanical (EEE) parts market by counterfeiters include parts obsolescence, extended lead times, the absence of verification tools, the availability of scrapped or salvaged parts, and the high costs associated with inspection/testing procedures. This article reports on the status of efforts by the G-19 Committee of SAE International to develop standards in response to increasing numbers of counterfeit parts in the supply chain.

23

Nuraliev, А. К., T. Amirov, and А. J. Esenbekov. "On the energy efficiency of electromechanical systems with an electromagnetic vibration exciter." E3S Web of Conferences 216 (2020): 01108. http://dx.doi.org/10.1051/e3sconf/202021601108.

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Study shake the phenomena in the electromechanical systems (EMS) are presented by permanent interest for the wide circle of researchers. The most effective source of vibrations in many cases is an electromagnetic causative vibration exciters (EMCV) in that there is transformation of electric power to energy of mechanical vibrations, that is related to the change of inductance. Electromagnetic vibration exciters have a number of significant advantages over other types of exciters. Due to the absence of rubbing parts they have high reliability and durability. They allow you to smoothly adjust the amplitude of vibrations over a wide range. EMCV are easy to integrate into production lines, they have easy maintenance, low operating costs and extensive automation capabilities. This phenomenon presents interest at development of electromechanics devices for intensive vibrotechnologies. Especially development guided on frequency of resonant EMCV promotes the economy of consumption of electric power and productivity of vibrotechnique. To the article the results of theoretical and experimental researches are driven on the increase of energy efficiency of EMCV and determination of output-input ratio. It is shown that losses of electric power in EMS with EMCV related to the origin of permanent constituents and ultra-harmonics of current, choice of magnetic chain and dynamic.

24

Kaplan, Halid, Kambiz Tehrani, and Mo Jamshidi. "A Fault Diagnosis Design Based on Deep Learning Approach for Electric Vehicle Applications." Energies 14, no. 20 (October 13, 2021): 6599. http://dx.doi.org/10.3390/en14206599.

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Diagnosing faults in electric vehicles (EVs) is a great challenge. The purpose of this paper is to demonstrate the detection of faults in an electromechanical conversion chain for conventional or autonomous EVs. The information and data coming from different sensors make it possible for EVs to recover a series of information including currents, voltages, speeds, and so on. This information is processed to detect any faults in the electromechanical conversion chain. The novelty of this study is to develop an architecture for a fault diagnosis model by means of the feature extraction technique. In this regard, the long short-term memory (LSTM) approach for the fault diagnosis is proposed. This approach has been tested for an EV prototype in practice, is superior in accuracy over other fault diagnosis techniques, and is based on machine learning. An EV in an urban context is modeled, and then the fault diagnosis approach is applied based on deep learning architectures. The EV and the fault diagnosis model is simulated in Matlab software. It is also revealed how deep learning contributes to the fault diagnosis of EVs. The simulation and practical results confirm that higher accuracy in the fault diagnosis is obtained by applying the LSTM.

25

Fan, Peng, and Hualing Chen. "Effect of crosslinks, entanglements, and chain extensibilities on dynamic electromechanical instability of dielectric elastomers." EPL (Europhysics Letters) 124, no. 3 (December 4, 2018): 37001. http://dx.doi.org/10.1209/0295-5075/124/37001.

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26

Sadroddini, Mohsen, and Mehdi Razzaghi-Kashani. "Electromechanical performance of polydimethylsiloxane containing reduced graphene oxide grafted by long-chain alkyl silane." Journal of Materials Science: Materials in Electronics 31, no. 21 (September 15, 2020): 18844–57. http://dx.doi.org/10.1007/s10854-020-04423-2.

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27

Cohen, Noy, Andreas Menzel, and Gal deBotton. "Towards a physics-based multiscale modelling of the electro-mechanical coupling in electro-active polymers." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, no. 2186 (February 2016): 20150462. http://dx.doi.org/10.1098/rspa.2015.0462.

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Owing to the increasing number of industrial applications of electro-active polymers (EAPs), there is a growing need for electromechanical models which accurately capture their behaviour. To this end, we compare the predicted behaviour of EAPs undergoing homogeneous deformations according to three electromechanical models. The first model is a phenomenological continuum-based model composed of the mechanical Gent model and a linear relationship between the electric field and the polarization. The electrical and the mechanical responses according to the second model are based on the physical structure of the polymer chain network. The third model incorporates a neo-Hookean mechanical response and a physically motivated microstructurally based long-chains model for the electrical behaviour. In the microstructural-motivated models, the integration from the microscopic to the macroscopic levels is accomplished by the micro-sphere technique. Four types of homogeneous boundary conditions are considered and the behaviours determined according to the three models are compared. For the microstructurally motivated models, these analyses are performed and compared with the widely used phenomenological model for the first time. Some of the aspects revealed in this investigation, such as the dependence of the intensity of the polarization field on the deformation, highlight the need for an in-depth investigation of the relationships between the structure and the behaviours of the EAPs at the microscopic level and their overall macroscopic response.

28

Machado, C., S. Baudon, M. Guessasma, V. Bourny, J. Fortin, R. Bouzerar, and P. Maier. "An Original DEM Bearing Model with Electromechanical Coupling." International Journal of Computational Methods 16, no. 05 (May 28, 2019): 1840006. http://dx.doi.org/10.1142/s0219876218400066.

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We have developped an original 2D modeling of bearings by Discrete Element Method (DEM). The mechanical behavior and the dynamic of a bearing is well reproduced. An electromechanical coupling is introduced to provide monitoring solutions. In practice, the mechanical state in real-time is usually unknown and existing numerical methods are restricted. Electromechanical coupling seems to be able to indirectly measure the dynamic loading of the bearing. This behavior leads to the development of a new monitoring method based on electrical signatures. The study proposes an original method of simulating the bearings to correlate dynamic mechanical state with electrical responses, over time. The bearing is seen as a polydisperse granular chain where rolling elements and cage components interact with a Hertzian contact model. Moreover, rings (and housing) are also taken into account using a cohesive model. Indeed, while many studies have been conducted on bearing simulation using FEM and multibody approaches, this discrete approach gives relevant informations on physical phenomena in the contact interface. One of our objectives is to investigate the sensitivity of the electrical measurement due to typical mounting. The ability of DEM to describe accurately the mechanical state of a bearing has been established by means of a comparison with FEM, of load distributions in a static case. In dynamic, the consequences associated with the flexibility of the bearing mounting (rigid and elastic rings) are studied with mechanical stresses acting in rings and with the load distribution. Also, by accessing dynamic stresses, this modeling opens certain possibilities on studies of damage and wear by providing the history of contact.

29

Peng, Li, Gao Zhi-gang, and Zhou Jun. "Power Loss and Heat Dissipation Characteristics of High-Power Electromechanical Actuators." MATEC Web of Conferences 153 (2018): 03003. http://dx.doi.org/10.1051/matecconf/201815303003.

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Due to serious power loss and heating caused by compact volume and high power density of high power electromechanical actuator (EMA), thermal analysis is becoming the key aspects in its design optimization. Numerical calculation method is proposed to calculate the electrical loss, iron core loss and drive chain mechanical loss in EMA. An equivalent thermal network model based on lumped parameters is established, with the acquisition of heat transfer matrix equation of all network nodes. Temperature rise of each part of the EMA is obtained by solving the equation. By comparison of simulated temperature rise in rated operating condition with test results, the accuracy of the model is verified. Then temperature rise simulation of EMA under simulated actual flight condition is carried out, with the results showing positive guidelines in the optimization design of EMA systems.

30

Zhang, Xi, Mingming Ren, Hongju Wang, and Lei Jin. "Simulation Study on Dynamic Characteristics of the Chain Drive System for Mining Scraper Conveyor Driven by the Permanent Magnet Synchronous Motor." Processes 12, no. 1 (January 10, 2024): 165. http://dx.doi.org/10.3390/pr12010165.

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The chain drive system represents a critical subsystem within the scraper conveyor. This paper proposes a joint simulation model for the drive system of the scraper conveyor, driven by the permanent magnet synchronous motor, in order to conduct a comprehensive analysis of the dynamic characteristics of the chain drive system during the operational process. Firstly, the dynamic simulation model for the mining scraper conveyor’s chain drive system was established in ADAMS, taking into account its structural characteristics. Then, the mathematical model of the permanent magnet synchronous motor was established using the coordinate transformation theory, and the speed controller based on vector control was designed by using the theory related to sliding mode control. The coupling relationship between the chain drive system of the scraper conveyor and the permanent magnet synchronous motor drive system was investigated. Finally, a joint simulation model of the mechanical system and motor control system was created using ADAMS (View 2019) and MATLAB/Simulink (2020a). The dynamic characteristics of the chain drive system were analyzed, and the three typical working conditions of no load, half load, and rated load were considered. The results show that the contact force between the flat ring and the sprocket undergoes an initial increase, followed by a decrease, and finally another increase. As the load increases from no load to full load, there is a marked increase in the contact force between the loaded side chainrings. Due to the polygon effect, both the speed curve of the permanent magnet drive motor and the contact force curve between the ring chains exhibit periodic fluctuations. The research in this paper provides an idea for the coupling analysis of the scraper conveyor electromechanical system.

31

Ivanov, Artem. "Simple in-system control of microphone sensitivities in an array." Journal of Sensors and Sensor Systems 13, no. 1 (April 30, 2024): 81–88. http://dx.doi.org/10.5194/jsss-13-81-2024.

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Abstract. A method to perform measurements of microphone responses directly in the array of a sensor system is described. It can be applied in reverberant environments and does not require high instrumentation effort. Due to the use of internal hardware of the sensor system, the whole signal chain of microphone–preamplifier–analogue-to-digital converter is characterized. The method was successfully tested for calibration of two types of planar arrays constructed with micro-electromechanical system (MEMS) microphones. Presented experimental results illustrate achieved performance, and possible application scenarios are discussed.

32

Wan, Qi, Chunyu Song, Yong Zhou, Ruiting Tong, Shangjun Ma, and Geng Liu. "Modeling and Analysis of the Flap Actuation System Considering the Nonlinear Factors of EMA, Joint Clearance and Flexibility." Aerospace 11, no. 6 (May 29, 2024): 440. http://dx.doi.org/10.3390/aerospace11060440.

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The performance of the flap actuation system directly affects the control effect and the flight quality of an aircraft. The electromechanical actuator (EMA) and the linkage mechanism are important components of the system. In order to achieve the goals of good transmission accuracy and dynamic response, the influence of nonlinear properties in the transmission chain including the EMA and linkage mechanism should be considered. A co-simulation model at the system-level of the flap actuation system was developed, which takes nonlinear factors of the EMA, the impact dynamics of the linkage mechanism with joint clearance and the rigid–flexible coupling characteristics into account. Moreover, the experiments with different command frequencies and loads were performed. The simulation and experimental results were compared to verify the effectiveness of the co-simulation model. Finally, the effects of nonlinear properties including the contact stiffness and clearance of a planetary roller screw mechanism, EMA anchorage stiffness, number of clearance joints, flexibility and load are discussed. This work can contribute to analyzing the performance of an electromechanical multibody system with nonlinear characteristics, which has crucial academic meaning and engineering application values for the development of systems with high speed, good reliability and long life.

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Ellingsen, O., A. J. Davidoff, S. K. Prasad, H. J. Berger, J. P. Springhorn, J. D. Marsh, R. A. Kelly, and T. W. Smith. "Adult rat ventricular myocytes cultured in defined medium: phenotype and electromechanical function." American Journal of Physiology-Heart and Circulatory Physiology 265, no. 2 (August 1, 1993): H747—H754. http://dx.doi.org/10.1152/ajpheart.1993.265.2.h747.

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We studied primary short-term cultures of adult rat ventricular myocytes in defined medium to determine whether phenotype and electromechanical function are maintained in rod-shaped, quiescent cells. Although > 80% of the myocytes retained their rod-shaped in vivo morphology for up to 72 h, contractile function as measured by cell edge motion declined 30-50% from 6 to 24 h, paralleling a 68% shortening of action potential duration. From 24 to 72 h, contractility remained unchanged. Ca2+ channel current density increased 55% after 24-48 h and then returned to the level of freshly isolated cells (9 +/- 1 pA/pF, mean +/- SE). Resting membrane potential (-71 +/- 1 mV) and action potential overshoot (34 +/- 3 mV) did not change. The ratio of alpha- to beta-myosin heavy chain mRNA and the level of cardiac alpha-actin mRNA were maintained for 8 days. Thus quiescent adult rat ventricular myocytes in defined medium undergo extensive phenotypic adaptation within 72 h of isolation, despite maintenance of a rod-shaped morphology and stable levels of contractile protein mRNA, which may limit their suitability for electrophysiological and contractile function studies.

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Ireta-Muñoz, Laura Alejandra, Isaías Cueva-Pérez, David Alejandro Elvira-Ortiz, Leonardo Esteban Moreno-Suárez, and Ángel Pérez-Cruz. "Study of Mechanical Response of Paper-Based Microfluidic System as a Potential Milk Tester." Micromachines 14, no. 7 (July 6, 2023): 1380. http://dx.doi.org/10.3390/mi14071380.

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Milk is considered a complete meal that requires supervision to determine its suitability for human consumption. The development of sustainable devices that evaluate food properties has gained importance due to the necessity of integrating these instruments into the production chain. However, the materials employed to develop it, such as polymers, semiconductors, and glass, lack sustainability and require specialized equipment to fabricate them. Different chemical techniques have been used to miniaturize these detection systems such as microfluidics, which have been used in milk component detection using colorimetry. In this work, a cantilever beam paper-based microfluidic system is proposed to evaluate differences in milk, according to nutritional information, using its electromechanical response. A 20-microliter milk drop is deposited in the system, which induces hygroexpansion and deflection due to liquid transport within the paper. Likewise, a conductive path is added on the beam top surface to supply a constant current that induces heat to evaporate the solution. According to the results obtained, it is possible to point out differences between trademarks with this microfluidic system. The novelty of this system relies on the paper electromechanical response that integrates the hygroexpansion-induced displacement, which can be used for further applications such as milk microtesters instead of colorimetric tests that use paper as a property-evaluation platform in combination with chemical reactions.

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Akhil, Jakkula, Jahira Banu T, Yogesh Ashok Sontakke, and Gopisankar Balaji. "Postoperative Rehabilitation of Anterior Cruciate Ligament Reconstruction." Clinical Medicine And Health Research Journal 2, no. 5 (September 4, 2022): 187–90. http://dx.doi.org/10.18535/cmhrj.v2i5.79.

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Anterior cruciate ligament injury is commonly seen in sports related trauma. Complete tear requires surgical reconstruction. During postoperative rehabilitation, because of arthrogenic muscle inhibition (AMI), the quadriceps muscle remains inactive and has reduced contraction. Various strategies were aimed at treating this AMI and/or improve quadriceps strength such as open chain (OKC) and closed chain kinetic (CKC) exercises, blood flow resistance training (BFRT), cryotherapy, and transcutaneous nerve stimulation (TENS). Of all these, CKC was better than OKC in improving the range of movements, weight bearing exercises provided quicker return to physical activity. Cryotherapy was found to be an effective way to counter AMI and improve knee function and reduce the pain. The BFRT and TENS were found to be ineffective. Single legged hop test at six months postoperatively was found to be reliable predictor of the quadriceps function at one year. Electromechanical dynamometry is the gold standard machine to assess the knee extension and provide exercise, handheld dynamometry is easy to use. Leg press, leg extension machine are other machines used to provide exercises.

36

Lipiński, Krzysztof, and Zbigniew Kneba. "Rigid Finite Element Modeling for Identification of Vibrations in Elastic Rod Driven by a DC-Motor Supplied from a Thyristor Rectifier." Solid State Phenomena 164 (June 2010): 297–302. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.297.

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The paper deals with the numerical analysis of electromechanical systems. The system consists of a DC motor supplied from a half-wave, single phase, thyristor rectifier, and of a flexible rod fixed to the axis of armature. Discretization of rigid segments is used to model flexibility of the rod. The discrete structure is considered as a multibody system, i.e. as a single kinematical chain of rigid bodies connected by massless joints. Significant drift rotation is included in the rod model. Numerical integration is performed in order to predict behavior of the system. Two working conditions are tested: steady-state motion and transient braking of the system. The attention in the paper is concentrated on interactions between the mechanical and electrical systems.

37

Liang, Yongri, Tongtong Cui, and Li Liu. "Effect of multi-armed chain extender on microphase morphology, stress-strain behavior and electromechanical properties of polyurethane elastomers." Polymer 235 (November 2021): 124279. http://dx.doi.org/10.1016/j.polymer.2021.124279.

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38

Abdinov, R. Sh, S. S. Nurkeev, and R. Silvestri. "Modelling of Processes of Decomposition of Organic Compounds of Municipal Solid Wastes in Cross Electromechanical Fields." Eurasian Chemico-Technological Journal 13, no. 3-4 (May 4, 2010): 235. http://dx.doi.org/10.18321/ectj89.

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At the present time, one of the most common methods of disposing the municipal solid wastes (MSW) is burial in sanitary landfills, where take place, long-term complex of physico-chemical and biochemical processes of decomposition. It was developed modeling of the natural process of decomposition of the solid Municipal wastes in cross electromechanical fields. The synthesized pellets was studied by IR spectroscopy. Residual hydrocarbons has a complex structure, represented by δ-lactones, cyclopentanone. The results of treatment of husk show there were the characteristic frequencies related to the OH group, indicating that the synthesis of dimers of branched chain alcohols (glycerides). Analysis of model shows that hydrocarbon product formed by the method of matching the external effects of the internal response of the reacting carbon-water composition.

39

Kazakov, Yu B., and I. A. Palilov. "Refined simulation and experimental study of energy efficient testing system of asynchronous machines." Vestnik IGEU, no. 6 (December 28, 2022): 18–25. http://dx.doi.org/10.17588/2072-2672.2022.6.018-025.

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When testing asynchronous machines, it is important to use energy-efficient methods, for example, the method of mutual loading of two machines with articulated shafts. One machine operates in the mode of the motor – frequency converter, the second machine operates in the mode of the generator – industrial frequency network. Both machines are simultaneously tested under load and energy costs for testing are reduced due to its recuperation. The method requires a correct loading algorithm. The modeling of the method based on chain models does not consider the implementation feature. Thus, it is advisable to refine the simulation of the asynchronous machine testing system by the mutual load method. The method is based on strict models considering the coupling of machine torque on a common shaft, the operation of machines in the mode of frequency converter, non-sinusoidal supply voltage, saturation of steel, displacement of current in conductors, for example, based on the associated analysis of electromagnetic fields in both machines. The authors have applied the packages of electromechanical units with electrical and mechanical Ansys Simplorer ports and finite element analysis of electromagnetic fields Ansys Maxwell for refined simulation of the asynchronous machine testing system by the method of mutual loading. Experimental studies of the system have been carried out on laboratory equipment using certified devices. A refined simulation of an energy-efficient testing system of asynchronous machines by the method of mutual loading has been carried out. It is based on calculations of the electromagnetic field and allows us to read the transient and steady-state modes of operation of a two-machine unit with a common shaft. An automated stand has been created that allows testing asynchronous machines by the method of mutual loading. The developed refined simulation of electromechanical processes in asynchronous machines during tests by the method of mutual loading with associated calculations of electromagnetic fields in both machines provides calculated results with an error of no more than 5–7 % in comparison with 40 % error of calculations in the transient modes of operation using chain models.

40

Jelbaoui, Yakout Khadouj, El Menzhi Lamiaà, and Abdallah Saad. "Fault diagnosis of a squirrel cage induction motor fed by an inverter using lissajous curve of an auxiliary winding voltage." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 3 (March 10, 2021): 1299. http://dx.doi.org/10.11591/ijeecs.v21.i3.pp1299-1308.

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The development of electronic power components has allowed the increase of the induction machine performance. Indeed, monitoring squirrel cage induction motors driven through rectifiers and inverters has been a major concern. This paper presents a new method to diagnose the combination inverter-machine faults. This technic considers an auxiliary winding which is a small coil inserted between two stator phases. It is based on Lissajous curve of this auxiliary winding voltage Park components. For this purpose, modeling the electromechanical conversion chain is necessary. The focus will particularly be on modeling both the squirrel cage induction machine and the inverter in a non-defected case which is a reference. Moreover, the explicit expressions developed for the inserted winding voltage and its Park components will be presented. The simulation results show the effectiveness of the proposed method.

41

Zhour, Abada, Ghoudelbourk Sihem, and DIB Djalel. "A New Approach to Fault Detection in the Power Converter in Wind Turbine Conversion Systems." International Journal of Robotics and Control Systems 1, no. 4 (October 23, 2021): 428–39. http://dx.doi.org/10.31763/ijrcs.v1i4.443.

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The detection of faults in a wind turbine chain is of prime importance in order to maintain safety, enhance reliability and improve economic performance. In addition, wind systems have to ensure a continuity of service for a considerable period of time in the event of an electrical fault in the network or a fault in one of the elements of the electromechanical conversion system. This paper presents a fault detection methodology of the power converter within a wind turbine chain, equipped with a Doubly-Fed Induction Generator (DFIG). A configurable, fast, and accurate scheme is developed, the basis of which is the reliable identification of the failed switch. The solution proposed in this work involves the deployment of a redundant arm in the event of a fault; the replacement arm is utilized while waiting for a maintenance or repair operation to be carried out. The approach developed in this paper provides continuity of service after the occurrence of a fault in the network system and fault detection time is reduced. The validity of the proposed identification methodology is assessed by means of simulation of the model of a wind turbine conversion system.

42

An, Junru, Yangyang Jiang, Bing Shi, Di Wu, and Wenming Wu. "Low-Cost Battery-Powered and User-Friendly Real-Time Quantitative PCR System for the Detection of Multigene." Micromachines 11, no. 4 (April 21, 2020): 435. http://dx.doi.org/10.3390/mi11040435.

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Real-time polymerase chain reaction (PCR) is the standard for nucleic acid detection and plays an important role in many fields. A new chip design is proposed in this study to avoid the use of expensive instruments for hydrophobic treatment of the surface, and a new injection method solves the issue of bubbles formed during the temperature cycle. We built a battery-powered real-time PCR device to follow polymerase chain reaction using fluorescence detection and developed an independently designed electromechanical control system and a fluorescence analysis software to control the temperature cycle, the photoelectric detection coupling, and the automatic analysis of the experimental data. The microchips and the temperature cycling system cost USD 100. All the elements of the device are available through open access, and there are no technical barriers. The simple structure and manipulation allows beginners to build instruments and perform PCR tests after only a short tutorial. The device is used for analysis of the amplification curve and the melting curve of multiple target genes to demonstrate that our instrument has the same accuracy and stability as a commercial instrument.

43

Martynov, Yurii, Oleksandr Petrenko, and Borys Liubarskyi. "Defining the Main Parameters and Performances of the Elevator Motor." NTU "KhPI" Bulletin: Power and heat engineering processes and equipment, no. 4 (December 30, 2021): 52–55. http://dx.doi.org/10.20998/2078-774x.2021.04.08.

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Contemporary tendencies relentlessly dictate the conditions for the appearance of a more qualitative, reliable and comfortable elevator chain for the rolling stock of a vertical motion. At the same time, the issues of energy saving and cost-effective use of resources gain currency against the background of rising prices for energy carriers and market prices for various elements that play an essential role in the availability of many electromechanical systems. Unfortunately, attention was paid to the availability of above problems in the elevator sector when the majority of the elevators (about 60% of them) outlived their technical service life that ensured the reliable operation. As a matter of fact, an amazingly important issue is relating to the embedment of reliable, durable and economically substantiated components of electromechanical systems into contemporary Ukrainian elevators. The purpose of the research done was to define the main parameters and performances of the asynchronous elevator motor of an ADB180M6 type. The motor is powered from the industrial network of 50 Hz and the frequency converter with the frequency of 50Hz and 16.6 Hz. This scientific paper uses the methods of physical investigations. The elevator motor test data satisfy the reliability parameters that make any elevator user feel comfortable. The main measurement data obtained for the engine No43886 of an ADB180M6 type powered from the frequency converter “Altivar” of 22kW with the motor speed of 910 rpm and 289 rpm satisfy the requirements of the regulatory documentation. The noise level is within satisfactory margins.

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Kim, Soo J., Roland R. Roy, Hui Zhong, Hideki Suzuki, Lusine Ambartsumyan, Fadia Haddad, Kenneth M. Baldwin, and V. Reggie Edgerton. "Electromechanical stimulation ameliorates inactivity-induced adaptations in the medial gastrocnemius of adult rats." Journal of Applied Physiology 103, no. 1 (July 2007): 195–205. http://dx.doi.org/10.1152/japplphysiol.01427.2006.

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The efficacy of high-load, short-duration isometric contractions, delivered as one vs. two sessions per day, on blunting inactivity-induced adaptations in the medial gastrocnemius (MG) were compared. Adult rats were assigned to a control (Con) or spinal cord-isolated (SI) group where one limb was stimulated (SI-Stim) while the other served as a SI control (SI-C). One bout of stimulation (BION microstimulator) consisted of a 100-Hz, 1-s stimulus, delivered every 30 s for 5 min with a 5-min rest period. This bout was repeated six times consecutively (SI-Stim1) or with a 9-h rest interval after the third bout (SI-Stim2) for 30 consecutive days. MG weights (relative to body weight) were 63, 72, and 79% of Con in SI-C, SI-Stim1, and SI-Stim2, respectively. Mean fiber size was 56% smaller in SI-C than in Con, and it was 19 and 31% larger in SI-Stim1 and SI-Stim2, respectively, compared with SI-C. Maximum tetanic tension was 42, 60, and 73% of Con in SI-C, SI-Stim1, and SI-Stim2, respectively. Specific tension was 77% of Con in SI-C, and at Con levels in both SI-Stim groups. SI increased the percent IIb myosin heavy chain composition (from 49 to 77%) and IIb+ fibers (from 63 to 79%): these adaptations were prevented by both Stim paradigms. These results demonstrate that 1) brief periods of high-load isometric contractions are effective in reducing inactivity-induced atrophy, functional deficits, and phenotypic adaptations in a fast hindlimb extensor, and 2) the same amount of stimulation distributed in two compared with one session per day is more effective in ameliorating inactivity-related adaptations.

45

Zhou, Zitong, Yanyang Zi, Jinglong Chen, and Tong An. "Hazard Analysis for Escalator Emergency Braking System via System Safety Analysis Method Based on STAMP." Applied Sciences 9, no. 21 (October 25, 2019): 4530. http://dx.doi.org/10.3390/app9214530.

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Due to the complex mechanical structure and control process of escalator emergency braking systems (EEBS), traditional hazard analysis based on the event chain model have limitations in exploring component interaction failure in such a complex social-technical system. Therefore, a hazard analysis framework is proposed in this paper for hazard analysis of complex electromechanical systems based on system-theoretic accident model and process (STAMP). Firstly, basic principles of STAMP are introduced and comparison with other hazard analysis methods is conducted, then the safety analysis framework is proposed. Secondly, a study case is performed to identify unsafe control actions of EEBS from control structures, and a specific control diagram is organized to recognize potential example casual scenarios. Next, comparison between fault tree analysis and STAMP for escalator’s overturned accident shows that hazards related to component damaged can be identified by both, while hazards that focus on components interaction can only be identified by STAMP. Besides, single control way and tandem operation process are found to be the obvious causal factors of accidents. Finally, some improvement measures like decibel detection or vibration monitoring of key components are suggested to help the current broken chain detection to trigger the anti-reversal device for a better safe EEBS.

46

Chen, Zhaoxiang, Yihai He, Fengdi Liu, Chunling Zhu, and Di Zhou. "Product infant failure risk modeling based on quality variation propagation and functional failure dependency." Advances in Mechanical Engineering 10, no. 12 (December 2018): 168781401881658. http://dx.doi.org/10.1177/1687814018816587.

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Product infant failure is the most crucial part of product quality risk that critically affects customer satisfaction. However, most of manufacturers lack sufficient understanding of the formation mechanism of product infant failure and quantitative infant failure risk modeling technology. These issues cause the inefficiency of warranty policy in preventing and controlling infant failure risk. Therefore, first, on the basis of the reverse mapping process of axiomatic design, an infant failure risk formation chain, that is, “process quality variation—physical defect—functional vulnerability—infant failure,” is proposed in this study by considering quality variation propagation and functional failure dependency to determine the inherent formation and dependent enlarging process of the risk. Second, on the basis of the risk formation chain, the infant failure risk is modeled from inherent risk and dependent risk. Specifically, the inherent infant failure risk is computed based on the stream of quality variation in production, whereas the dependent infant failure risk is computed by a Bayesian network by considering the functional failure dependency. Finally, a case study of an illustrative electromechanical system is introduced to verify the applicability of the proposed method. Result shows that the proposed method has a better performance in infant failure risk modeling.

47

Sun, Yao, Tao Li, Qiaomei Sun, Yuan Cheng, and Kaiyang Zeng. "Chain substitution caused sub-fibril level differences in electromechanical structure and property of wild-type and oim/oim collagen fibers." Journal of Applied Physics 128, no. 23 (December 21, 2020): 235111. http://dx.doi.org/10.1063/5.0016535.

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48

Zhukovskiy, Yuriy, Nikolay Korolev, and Yana Malkova. "Monitoring of grinding condition in drum mills based on resulting shaft torque." Записки Горного института 256 (November 10, 2022): 686–700. http://dx.doi.org/10.31897/pmi.2022.91.

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Grinding is the most energy-intensive process among all stages of raw material preparation and determines the course of subsequent ore beneficiation stages. Level of electricity consumption is determined in accordance with load characteristics forming as a result of ore destruction in the mill. Mill drum speed is one of process variables due to which it is possible to control ore destruction mechanisms when choosing speed operation mode of adjustable electric mill drive. This study on increasing energy efficiency due to using mill electric drive is based on integrated modelling of process equipment – grinding process and electromechanic equipment – electric drive of grinding process. Evaluating load torque by means of its decomposition into a spectrum, mill condition is identified by changing signs of frequency components of torque spectrum; and when studying electromagnetic torque of electric drive, grinding process is monitored. Evaluation and selection of efficient operation mode of electric drive is based on the obtained spectrum of electromagnetic torque. Research results showed that with increasing mill drum speed – increasing impact energy, load torque values are comparable for the assigned simulation parameters. From the spectra obtained, it is possible to identify mill load condition – speed and fill level. This approach allows evaluating the impact of changes in process variables of grinding process on parameters of electromechanical system. Changing speed operation mode will increase grinding productivity by reducing the time of ore grinding and will not lead to growth of energy consumption. Integration of digital models of the technological process and automated electric drive system allows forming the basis for developing integrated methods of monitoring and evaluation of energy efficiency of the entire technological chain of ore beneficiation.

49

Zhu, Qinghao, and Jianming Qi. "Abundant Exact Soliton Solutions of the ( 2 + 1 )-Dimensional Heisenberg Ferromagnetic Spin Chain Equation Based on the Jacobi Elliptic Function Ideas." Advances in Mathematical Physics 2022 (December 3, 2022): 1–21. http://dx.doi.org/10.1155/2022/7422491.

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The Heisenberg ferromagnetic spin chain equation (HFSCE) is very important in modern magnetism theory. HFSCE expounded the nonlinear long-range ferromagnetic ordering magnetism. Also, it depicts the characteristic of magnetism to many insulating crystals as well as interaction spins. Moreover, the ferromagnetism plays a fundamental role in modern technology and industry and it is principal for many electrical and electromechanical devices such as generators, electric motors, and electromagnets. In this article, the exact solutions of the nonlinear ( 2 + 1 )-dimensional HFSCE are successfully examined by an extended modified version of the Jacobi elliptic expansion method (EMVJEEM). Consequently, much more new Jacobi elliptic traveling wave solutions are found. These new solutions have not yet been reported in the studied models. For the study models, the new solutions are singular solitons not yet observed. Additionally, certain interesting 3D and 2D figures are performed on the obtained solutions. The geometrical representation of the HFSCE provides the dynamical information to explain the physical phenomena. The results will be significant to understand and study the ( 2 + 1 )-dimensional HFSCE. Therefore, further studying EMVJEEM may help researchers to seek for more soliton solutions to other nonlinear differential equations.

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Шевченко, І. С., Є. С. Руднєв, and Ю. А. Романченко. "Modeling of the electric drive of the main motion of the rolling cage as a multi-mass electromechanical system." ВІСНИК СХІДНОУКРАЇНСЬКОГО НАЦІОНАЛЬНОГО УНІВЕРСИТЕТУ імені Володимира Даля, no. 4(268) (June 10, 2021): 30–34. http://dx.doi.org/10.33216/1998-7927-2021-268-4-30-34.

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The model of rolling stand of a thick-plate rolling mill 3000 has been designed in the work in order to determine the oscillations frequencies that occur during operation, the effect of their amplitude on the dynamic deviations of the speed of the working body from the specified one.Presented results of the research dynamic to rolling cage 3000 at presentation her as seven masses electromechanic system. Shown influence clearance in mechanical issue on dynamic of the mechanism.The research by the method of mathematical modeling in the design and operation of mechanical equipment is substantiated.The design diagram of mechanical part of the electromechanical system is presented.Using the simulation results it was confirmed that the influence of internal viscous friction in shafting on the oscillation damping is not significant in relation to the damping properties of electric drive.Therefore, in the first approximation, it can be ignored. The electric drive of the rolling stand was considered as a TP-D system with speed and current regulators at their standard settings to the modular optimum. To reduce the magnitude of the elastic moments in the kinematic chain of the stand the armature current intensity generator in the electric drive is used.Simulation of the processes was carried out in Simulink of the MATLAB package.Thestand model is designed according to design scheme and reflects the branching into two channels with their combination through an elastic element – the material that is rolled.Based on real geometry and taking into account the properties of material the stiffness of shafts of mechanical transmissions were calculated.The model was set to a rolling program with a variable speed – in order to compensate the thickness difference, which corresponds to modern technological trends.Comparing the simulation results, it was found that the presence of a gap provokes the appearance of self-oscillations, the damping of which in a real mechanical system will occur due to damping properties of the shafts.The damping of oscillations takes place due to the damping properties of the electric drive. The appearance of a gap in the spindles leads to an increase in the system vibration frequency (70-80 Hz).

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