scholarly journals Variants of structures of the ship’s electromotive complex with common DC bus-bars

2021 ◽  
Vol 244 ◽  
pp. 08003
Author(s):  
Fedor Gelver ◽  
Alecsandr Saushev
Keyword(s):  
Mathematical Modeling ◽  
Rotation Speed ◽  
Electric Machines ◽  
Increase Energy Efficiency ◽  
Existing Structures ◽  
Operating Modes ◽  
Lower Weight ◽  
Timing Diagrams ◽  
Working Medium ◽  
Dc Bus

Schematic and algorithmic solutions for the design and construction of ship’s electromotive systems of various purposes are considered. The analysis of the existing structures of electromotive complexes, as well as the types of electrical converters used is carried out. The structure of an electromotive complex based on a transformerless structure with common DC bus-bars is proposed. The main goals of improvement are to increase energy efficiency, reliability and survivability of an electric power plant, and lower weight and size characteristics. The proposed structure of the ship’s electromotive complex allows braking the propellers without using additional braking circuits with the redistribution of energy between the propeller electric machines and the dissipation of braking energy in the working medium - water. An algorithm is proposed and mathematical modeling of braking and reverse modes of a propeller electric installation is carried out. Timing diagrams of changes in torque, rotation speed and power on each of the propellers for the proposed algorithm of braking and reverse of propeller motors are presented. It is shown that the synthesized structure of the electromotive complex makes it possible to reduce the emissions of pollutants into the environment, as well as to save fuel within the range of 10÷15%, depending on the operating modes of the ship in comparison with the existing structures of the electromotive systems.

The Tapping Machine Mathematical Modeling Simulation Study

2013 ◽  
Vol 373-375 ◽  
pp. 2073-2077
Author(s):  
Bing Hua Jiang ◽  
Li Fang ◽  
Hang Biao Guo
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Blast Furnace ◽  
Rotation Speed ◽  
Pulse Signal ◽  
Structural Features ◽  
Machine Model ◽  
Modeling Simulation ◽  
Impact Attenuation ◽  
Simulation Results

Based on the tapping machines special structural features and practices, from both directions of rotation and impact established the tapping machine mechanism rotating borer and impact dynamic mathematical model, analysed the effect of different tapping machines parameters on the model itself, simulated the model with inputting wide pulse signal, the simulation results show that: firstly, the tapping machine model established in this paper is reasonable; secondly, increase the damping coefficient of the blast furnace, the tapping machines rotating borer rotation speed and impact attenuation speed decrease.

Mathematical Modeling of Process Moving Cargo by Overhead Crane

2014 ◽  
Vol 701-702 ◽  
pp. 715-720 ◽  
Author(s):  
Vitaly Shcherbakov ◽  
Mikhail Korytov ◽  
Roman Sukharev ◽  
Elena Volf
Keyword(s):  
Mathematical Modeling ◽  
Mechanical System ◽  
Second Generation ◽  
Block Diagram ◽  
Design Stage ◽  
Bridge Crane ◽  
Overhead Crane ◽  
Operating Modes ◽  
Design Scheme ◽  
Simulink Model

According to the proposed design scheme of the overhead crane, with the use of blocks package SimMechanics Second Generation of MATLAB, a conceptual block diagram of connections was developed, according to which the was created Simulink-model of the mechanical system of the bridge crane with PID regulator. Simulink-model allows us to study the operating modes of the overhead crane on the its design stage.

scholarly journals Electroresistive method for monitoring the technical condition, quality, reliability and safety the supports of rolling of electrical machines

2022 ◽  
Vol 1211 (1) ◽  
pp. 012021
Author(s):  
K V Podmasreryev ◽  
V V Markov ◽  
V V Mishin ◽  
A V Selikhov ◽  
N V Uglova
Keyword(s):  
Mathematical Modeling ◽  
Electrical Resistance ◽  
Experimental Studies ◽  
Rolling Bearing ◽  
Technical Condition ◽  
Electric Machines ◽  
The State ◽  
Electrical Machines ◽  
Technical State ◽  
Internal Environment

Abstract The necessity of monitoring the technical condition of the rolling supports of electric machines has been substantiated. It is proposed to use the electrical resistance of the bearing as an indicator of the technical condition the rolling support. The results of mathematical modeling of electrical resistance in the form of a function of resistance from factors of the internal environment of the bearing and modes of its assembly and operation in a rolling bearing are presented. An electroresistive method for monitoring the technical state the rolling support is proposed, which differs from the known methods by original algorithms for collecting information about the state of bearing parts, experimental studies have been carried out to confirm the efficiency of this method.

scholarly journals Mathematical modeling of thermal processes in small-size DC electric machines

2019 ◽  
Vol 643 ◽  
pp. 012002
Author(s):  
Yu V Pisarevsky ◽  
A I Borisova ◽  
V L Burkovsky ◽  
A Yu Pisarevsky ◽  
V B Fursov ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Electric Machines ◽  
Thermal Processes

scholarly journals Mathematical Modeling of Microbial Fuel Cells in Wastewater Treatment - Homotopy Perturbation Method

2019 ◽  
Vol 8 (4) ◽  
pp. 5634-5640
Keyword(s):  
Mathematical Modeling ◽  
Perturbation Method ◽  
Microbial Fuel Cells ◽  
Homotopy Perturbation Method ◽  
Linear Equations ◽  
Rate Equations ◽  
Operating Modes ◽  
Homotopy Perturbation ◽  
Non Linear ◽  
Experimental Values

Mathematical modeling of Microbial Fuel Cell (MFC), which accounts for the co-existence of methanogenic and anodophilic microbial populations for different operating modes and reactor configurations, is discussed. This model based on the system of non-linear rate equations, where the non-linear term is related to the rate of the reactions. The system of non-linear equations is solved by using homotopy perturbation method. In this paper closed form of analytical expression of the concentration of substrate, anodophilic, methanogenic, and the mediator is derived. The analytical expressions are compared with simulation results for the experimental values of parameters, and satisfactory agreement is noted. The influence of parameters on the concentration profiles are discussed.

Mathematical Modeling of Asymmetrical Operating Modes of Power Autotransformers

2019 ◽  
Vol 90 (6) ◽  
pp. 428-434 ◽  
Author(s):  
A. N. Golubev ◽  
V. A. Martynov ◽  
V. A. Shuin
Keyword(s):  
Mathematical Modeling ◽  
Operating Modes
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