scholarly journals Load switching between main power grid to the backup grid by standard automatic transfer switch

2022 ◽  
Vol 23 (5) ◽  
pp. 160-171
Author(s):  
A. P. Chervonenko ◽  
D. A. Kotin ◽  
A. V. Rozhko
Keyword(s):  
High Speed ◽  
Load Transfer ◽  
Asynchronous Motor ◽  
Time Intervals ◽  
Emergency Situations ◽  
Voltage Drops ◽  
Digital Modeling ◽  
Methods Of Synthesis ◽  
Switch System ◽  
Research Stage

PURPOSE. To develop a variant of the algorithm for the automatic input of the reserve, which consists in transferring the load in case of emergency situations, to make a simulation model in the MatLab® environment corresponding to the developed generalized electrical scheme of the system.METHODS. When solving the problem, the method of digital modeling was used, which consists in the maximum approximation of the system under study to a real object, implemented by means of MatLab.RESULTS. It is proposed to study the methods of synthesis of digital models of compensation of voltage drops by the example of a study of an automatic reserve transfer system, demonstrating an approach to modeling this system. When developing models in the MatLab environment, the parameters of real technical elements and devices and their digital analogues are taken into account. The issue of creating a digital model of an electric drive system, including a model of an asynchronous motor with a short-circuited rotor, is considered. The result, after final refinement, can be used to design a real system in production conditions.CONCLUSIONS. The developed model of the automatic transfer switch system is operable, the time indicators are satisfactory for systems that do not make excessive demands on performances and time intervals. For systems that are sensitive to current inrushes during load transfer, some improvements are required, which are reduced to the implementation of a high-speed automatic switch system. The development of this system is currently at the research stage, namely, the compilation of a load transfer logic that takes into account the phase matching of electrical circuits.

Velocities of Starch Particles in ER Fluids Measured with Laser Speckle

2011 ◽  
Vol 287-290 ◽  
pp. 2781-2784
Author(s):  
Ji Jun Fan ◽  
Nan Hui Yu
Keyword(s):  
Electric Field ◽  
High Speed ◽  
Ccd Camera ◽  
Laser Speckle ◽  
Time Intervals ◽  
Sample Concentration ◽  
Speckle Patterns ◽  
The Mean ◽  
Er Fluids ◽  
Short Time

In this paper, the principle of measuring infinitesimal displacement by laser speckle is proposed to measure the velocities of particles in ER fluids. It is verified that speckles can be formed by illuminating laser beam on the starch ER fluids. The speckle patterns was recorded with high speed CCD camera, and the speckle patterns sequences with short time intervals was obtained by intercepting laser speckle video. Displacements parallel to the direction of electric field and that perpendicular to the direction of electric field were obtained by processing the two consecutive speckle patterns. The experimental results showed that the velocities of particles decreased oscillatorily with time. There is a critical electric field and a critical sample concentration, when lower than this critical electric field (concentration), the mean particle velocity increased; otherwise, it decreased.

Progress of RSFQ High Performance Packet Switch

2006 ◽  
Vol 47 ◽  
pp. 188-194
Author(s):  
Shinichi Yorozu ◽  
Yoshihito Hashimoto ◽  
Yoshio Kameda ◽  
Toshiyuki Miyazaki
Keyword(s):  
Power Consumption ◽  
High Speed ◽  
High Performance ◽  
Semiconductor Technology ◽  
Switch Architecture ◽  
Traffic Loads ◽  
Rapid Single Flux Quantum ◽  
Switch System ◽  
Packet Switch ◽  
Switch Circuit

Internet traffic loads are increasing. Sustaining packet switching throughput of a core node will be difficult. A major reason for this is power consumption and packaging volume. As long as we use only current semiconductor technology, the switching capacity will be limited. Rapid single flux quantum (RSFQ) superconducting technology can overcome such difficulties because of high-speed operation and low-power consumption characteristics. A superconducting wiring also enables high-speed inter-chip communication. We report on progress on packet switch circuit implementation and cryo-cooled packaging for a RSFQ packet switch system. In addition, we discuss a possible packet switch architecture over 100 Tbps that uses RSFQ technology.

scholarly journals Vector Speed Regulation of an Asynchronous Motor Based on Improved First-Order Linear Active Disturbance Rejection Technology

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2168 ◽  
Author(s):  
Xuesong Zhou ◽  
Chenglong Wang ◽  
Youjie Ma
Keyword(s):  
Induction Motor ◽  
Disturbance Rejection ◽  
High Speed ◽  
Low Cost ◽  
Asynchronous Motor ◽  
State Variables ◽  
Control Effect ◽  
Speed Regulation ◽  
Active Disturbance Rejection ◽  
Static Performance

Asynchronous motors are widely used in industry and agriculture because of their simple structure, low cost, and easy maintenance. However, due to the coupling and uncertain factors of the actual operation of the motor, a traditional controller cannot achieve a satisfactory control effect. A linear active disturbance rejection controller (LADRC), featuring good robustness and adaptability, was proposed to improve the control efficiency of a nonlinear, uncertain plant. A linear extended state observer (LESO) is the core part of a L. The accuracy of the observation of state variables and unknown disturbances is related to the control effect of the controller. The performance of a traditional LESO is not high enough, and thus an error differential is introduced by analyzing the principle of LESO to improve its observation performance. The improved LADRC applies to the vector speed control of the induction motor. Additionally, low-speed and high-speed no-load starting, sudden load, electromagnetic torque, and three-phase stator current of the induction motor was simulated using MATLAB (Developed by MathWorks in Natick, MA, USA, and dealt by MathWorks Software (Beijing) Co., Ltd. in Beijing, China). Theoretical analysis and simulation results show that the ADRC based on the improved linear expansion observer was better than the traditional linear ADRC in terms of the dynamic and static performance and robustness.

Experimental modeling and pathomorphological picture of dosed acute traumatic brain injury

2020 ◽  
pp. 59-69
Author(s):  
Kseniya Vyacheslavovna Kuznetsova ◽  
Nataliya Vladimirovna Zhuravskaya ◽  
Igor Valentinovich Barskov ◽  
Olga Ivanovna Slyusar ◽  
Vladimir Germanovich Taktarov
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Effective Treatment ◽  
High Speed ◽  
Medical Science ◽  
Experimental Modeling ◽  
Wide Spread ◽  
Emergency Situations ◽  
Military Conflicts ◽  
Acute Traumatic Brain Injury

In recent decades, there has been a wide spread of open traumatic brain injury (TBI) closely associated with an increase in the pace of life, rise in the number of high-speed vehicles, industrialization, as well as such phenomena as terrorism and local military conflicts. The problem of diagnostics and effective treatment of traumatic brain injury is one of the most important for ambulance doctors, doctors of the Ministry of Emergency Situations, and neurosurgeons in providing timely qualified assistance, and is also of interest for modern medical science for further studying pathological processes and preventing the development of complications in this pathology.

Study of PCBN Cutting Tools Wear in High Speed Cutting Hardened Steel GCr15

2010 ◽  
Vol 431-432 ◽  
pp. 245-248
Author(s):  
Yu Wang ◽  
Yuan Sheng Zhai ◽  
Fu Gang Yan ◽  
Xian Li Liu
Keyword(s):  
Wear Mechanisms ◽  
High Speed ◽  
Cutting Tools ◽  
Cutting Parameters ◽  
Hardened Steel ◽  
Structure Design ◽  
High Speed Cutting ◽  
Use Efficiency ◽  
Tools Wear ◽  
Research Stage

PCBN cutting tools is in high speed, high temperature and high pressure environment when high speed precision hard cutting hardened steel. Shear extrusion and slip effect in high speed cutting, cutting tools wear mechanisms are different from common cutting, even cutting tools wear mechanisms in high speed is in research stage at present. In this paper, coated PCBN cutting tools wear mechanisms in high speed cutting(v＝200~600m/min) GCr15 (HRC62-64) is studied, it is helpful to obtain cutting tools structure design, cutting parameters and improve cutting tools use efficiency.

Police Officer Interactions with In-vehicle Technologies: An On-Road Investigation

2020 ◽  
Vol 64 (1) ◽  
pp. 1976-1980
Author(s):  
Farzaneh Shahini ◽  
Maryam Zahabi ◽  
Ben Patranella ◽  
Ashiq Mohammed Abdul Razak
Keyword(s):  
Police Officers ◽  
High Speed ◽  
Motor Vehicle ◽  
Mental Workload ◽  
Short Exposure ◽  
Short Exposure Time ◽  
Emergency Situations ◽  
Simulated Environment ◽  
Vehicle Technology ◽  
Vehicle Technologies

Police motor vehicle crashes are a leading cause of officers’ fatalities in line of duty. These crashes have been attributed not only to driving at high speed in emergency situations but more importantly to interaction with different in-vehicle technologies. Prior studies in this domain have been limited to specific equipment and short exposure time and were typically conducted in laboratory settings with simulated environment or tasks which limit their generalizability to actual police operations. The objective of this study was to identify the most frequently used and cognitively demanding in-vehicle technologies for police officers while driving. Ten officers participated in a three-hour ride-along study. Findings suggested that the mobile computer terminal is the most frequently used and visually and cognitively demanding in-vehicle technology for police officers. Other factors such as work shift, duration, and average time spent in the vehicle per shift can also affect workload. The results indicated the need for improvements in in-vehicle technology design and implementation, officer training protocols, and departmental policies in order to reduce officers’ mental workload and improve safety in police operations.

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