scholarly journals Smyslova Simulation modeling of logistic system for liquid iron transportation at metallurgical plant

2020 ◽  
Vol 63 (1) ◽  
pp. 71-77
Author(s):  
K. O. Vinogradov ◽  
A. L. Smyslova
Keyword(s):  
Simulation Model ◽  
Liquid Iron ◽  
Metallurgical Plant ◽  
Converter Shop ◽  
Operation Mode ◽  
Real Data ◽  
Blast Furnace Smelting ◽  
Logistics System ◽  
Short Period ◽  
Main Production

During the study of technological data of the process of liquid iron transportation, it was found that the number of locomotives and mixers depending on the duration of operations and especially on the inter-operational downtime does not always ensure normal rhythm of the main production. It leads to significant production losses, therefore, the work of the producing and transport complex is not effective enough. The authors have developed a simulation model of a logistics system for transporting liquid iron at a metallurgical plant. The study and construction of the model was performed using AnyLogic. Real data from production, namely the schedule of blast furnace smelting for a three-week period, was used as the initial data. To prove adequacy of the model, the results were compared with the actual tact of the mixers movement, as well as with the theoretical need of the converter shop. Values of the liquid iron weight delivered to the converter shop were obtained during the simulation and were related to the theoretical ones. Efficiency of the model is achieved by automatically collecting in real time of statistical values of the parameters of simulation objects. The system analyzes the collected data and makes decisions based on them for a short period of time (less than one second). In default operation mode of the simulation model, motion of the mixers is controlled automatically without participation of the dispatcher, which improves efficiency, as well as decision-making speed. Such model provides simulation of failures in operation of the converter shop. According to the simulation results, it can be concluded that the system delivers less liquid iron to a converter shop, but retains its rhythm. After resuming the operation of all converters, the tact of transportation reaches the required level.

scholarly journals Rapid Deployment and Application Exploration of the Mobile Shelter Laboratories Under T He Outbreak of COVID-19 Epidemic

2021 ◽  
Author(s):  
Yi Luan ◽  
Rui Ding ◽  
Wenshen Gu ◽  
Xiaofan Zhang ◽  
Xinliang Chen ◽  
...  
Keyword(s):  
Large Scale ◽  
Mainland China ◽  
Reference Value ◽  
Guangdong Province ◽  
Real Data ◽  
Practical Experience ◽  
Rapid Expansion ◽  
Nucleic Acid Detection ◽  
Short Period ◽  
Detection Capabilities

Abstract Since the end of 2019, the COVID-19 epidemic has swept the world. With the widespread spread of the COVID-19 and the continuous emergence of mutated strains, the situation for the prevention and control of the COVID-19 epidemic remains severe. On May 21, 2021, Guangzhou City, Guangdong Province, notified the discovery of a new locally confirmed case. Guangzhou became the first city in mainland China to compete with the delta mutant strain. As a local hospital with strong nucleic acid detection capabilities, Sun Yat-sen University Sun Yat-sen Memorial Hospital took the lead in launching the construction and deployment of the Mobile Shelter Laboratories and large-scale screening work in Foshan and Zhanjiang, Guangdong Province. Through summarizing "practical" experience, observation and comparison data analysis, we use real data to verify a feasible solution for rapid expansion of detection capabilities in a short period of time. We hope that these experiences will have certain reference value for other countries or regions, especially the underdeveloped areas of medical and health care.

The Influence of Measured Trajectory Based Model Parameters Correcting on Simulation Precision of Power System Dynamic Frequency

2013 ◽  
Vol 448-453 ◽  
pp. 2545-2550
Author(s):  
Gang Mu ◽  
Ming Li ◽  
Jun An ◽  
Xing Wei Xu ◽  
Shuai Shao
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Process Simulation ◽  
Northeast China ◽  
Operation Mode ◽  
Measured Data ◽  
Model Parameters ◽  
Conservative Operation ◽  
Generator Frequency ◽  
Dynamic Frequency

Although numerical simulation is an important method of researching dynamic frequency process, obvious deviations have been found between numerical simulation and the measured trajectory in many accidents. And the existing simulation model and parameters cannot describe the actual dynamic process of frequency accurately. Research was carried out on the influence of four parameters to the dynamic frequency process, which based on the WSCC system. The four parameters include the inertia constant of generator, generator frequency coefficient, dead band and turbine intermediate superheating coefficient. Northeast China power grid and measured data are used to verify the above research conclusion. Checking the dynamic frequency process simulation model and parameters can improve the accuracy of dynamic frequency process simulation on the base of the measured trajectory and the physical characteristics of the parameters. It can also give efficient foundation for the setting work of UFLS, overcoming the previous conservative operation mode and so on.

scholarly journals Development of a simulation model of HPPs chain operation

2020 ◽  
Vol 191 ◽  
pp. 02004
Author(s):  
Alexandra Khalyasmaa ◽  
Stanislav Eroshenko ◽  
Sergey Mitrofanov ◽  
Anastasia Rusina ◽  
Anna Arestova ◽  
...  
Keyword(s):  
Power Systems ◽  
Simulation Model ◽  
Power Plants ◽  
River Flow ◽  
Water Pressure ◽  
Operation Mode ◽  
Flow Characteristics ◽  
Time Lags ◽  
Hydroelectric Power ◽  
Hydro Power

The paper presents a simulation model of a hydroelectric power plants chain. The model allows solving the problem of hydro power plants (HPPs) operation mode planning in a unified power system, taking into account the optimization of water resources. The optimal filling and decrease of storage was performed in MATLAB Simulink software. The hydraulic properties of the river flow between the stations and the corresponding time lags in the functioning of the down-river station are taken into account. The model allows continuously monitoring changes in water pressure at hydropower plants and, as a result, uses the family of flow characteristics for various water pressures. The issues of optimizing the participation of hydroelectric power stations in the regimes of large hydrothermal power systems were also raised.

scholarly journals Simulation model of situational control of transshipment machinery fleet

2019 ◽  
Vol 135 ◽  
pp. 02028
Author(s):  
Igor Zub ◽  
Yuriy Ezhov ◽  
Viktor Shchemelev
Keyword(s):  
Simulation Model ◽  
Petri Nets ◽  
Service Time ◽  
Statistical Data ◽  
Stochastic Nature ◽  
Conflict Situations ◽  
Short Period ◽  
Situational Management ◽  
And Storage

The seaport is a place for cargo transshipment and storage. The speed of vehicle processing is one of the indicators of port’s performance. The time of vehicles being under processing depends on the performance of a fleet of transshipment machinery. The stochastic nature of vehicles’ arriving leads to the intense operation of handling facilities and formation of wait lists for vehicles to be loaded or unloaded, or to the downtime of transshipment machinery when vehicles are absent. Depending on the operational situation, transshipment machinery is brought out for maintenance operations that can be performed by unit, which provides the increase in the technical use coefficient. For maintenance of individual units, the decomposition of handling facility is performed; statistical data on the time of maintenance conduction for all units is collected. Statistical data are entered into the database. When transshipment machinery is brought out of operation for a short period, the unit is selected, the service time of which coincides with the downtime of a brought out facility. To visualize the process of situational management of maintenance and define conflict situations, a simulation model was developed with the use of the apparatus of Petri nets. The analysis of the model helped to reveal conflict situations that can be solved both during situational management of transshipment machinery fleet and by means of models nested into conflict places.

scholarly journals The dissemination of COVID-19: an expectant and preventive role in global health

2020 ◽  
Vol 30 (1) ◽  
pp. 135-140
Author(s):  
Renata Macedo Martins Pimentel ◽  
Blanca Elena Guerrero Daboin ◽  
Adriana Gonçalves de Oliveira ◽  
Hugo Macedo Jr
Keyword(s):  
Middle Eastern ◽  
Large Family ◽  
Real Data ◽  
World Population ◽  
Hygiene Practices ◽  
New Variant ◽  
Short Period ◽  
Health Care Models ◽  
Care Models ◽  
Severe Infections

Coronaviruses (CoV) make up a large family of viruses, known since the mid-1960s, which received this name due to the spikes on its surface, which resemble a crown (from the Latin corona). CoV infections can cause everything from a common cold to severe respiratory syndromes, such as severe acute respiratory syndrome (SARS-CoV) and Middle Eastern respiratory syndrome (MERS-CoV). COVID-19 is a new variant of the coronavirus, and its isolation occurred in China on January 7th, 2020. COVID-19 has stood out with a high impact on public health due to the high number of cases with infection in a short period of time. However, it is possible to observe that 17% of patients confirmed with COVID-19 have severe infections and about 2.5% of these patients die. Current studies have shown that the number of mild and asymptomatic cases may be even greater. Thus, the challenges for controlling unreported cases of patients with mild symptoms that are spreading the virus and interfering with the magnitude and real data of the cases stand out. The transmission of the coronavirus occurs between humans, and it can occur from person to person through the air, through coughing or sneezing, by touching or shaking hands or by contact with contaminated objects or surfaces, followed by contact with the mouth, nose or eyes. Given the fluctuation in the incidence and the lethality rate, it is essential to stand out the precepts of health promotion in search of reorienting hygiene practices, considering that there is validity in health care models, still with a curative approach and the current situation experienced by the world population requires a preventive stance.

scholarly journals SIMULATION MODEL OF LOGISTICS SYSTEM

2019 ◽  
pp. 553-559
Author(s):  
Svilen Stefanov ◽  
Venelin Terziev ◽  
Vanya Banabakova
Keyword(s):  
Simulation Model ◽  
Logistics System
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