Technical operation of electric ships

2020 ◽  
Author(s):  
Aleksey Burkov
Keyword(s):  
Physical Modeling ◽  
Integrated Assessment ◽  
Theory And Practice ◽  
Physical Models ◽  
Maritime Education ◽  
Electric Drives ◽  
Algorithmic Software ◽  
Mathematical And Physical Modeling ◽  
Technical Operation ◽  
Technical Solutions

The book investigates the issues related to improving the efficiency of technical operation of ship electric drives, developed their classification. Identified ship's drives, having low reliability, designed and implemented technical solutions to increase their reliability. The appropriateness of the integrated assessment within the tasks of a mathematical and physical modeling. Developed and implemented mathematical and physical models for studies of electric drives. The proposed method, an algorithmic software, and made payments of contactors for work in the proposed technical solutions. Designed for those who specializiruetsya in the field of the theory and practice of ship electric drives. Useful for the learning process in the system of higher Maritime education.

scholarly journals Physical modeling of unsteady electromagnetic processes in power transformer under sharp load fluctuations

2021 ◽  
pp. 21-30
Author(s):  
Volodymir Zinovkin ◽  
Olexander Blyzniakov ◽  
Krysan Yurij ◽  
Mykchailo Zaluzhnyi
Keyword(s):  
Physical Modeling ◽  
Power Transformer ◽  
Similarity Theory ◽  
General Purpose ◽  
Theory And Practice ◽  
Physical Models ◽  
Similarity Criteria ◽  
Power Transformers ◽  
Arc Furnaces ◽  
Electromagnetic Processes

Purpose. To develop and experimentally confirm the method of physical modeling of non-stationary electromagnetic processes in a powerful power transformer operating under variable loads by combining similarity criteria and equivalence coefficients. Methodology. Theoretical provisions of mathematical and computer modeling, theoretical electrical engineering were used in the research, as well as the theory of experiment with the application of equivalence coefficients. Findings. Methods of experimental research were developed, which include the formation and registration of a set of external and internal parameters of physical models, prototypes and real equipment. Criteria for similarity of nonstationary electromagnetic processes excited by sharply changing scattering fields in special purpose power transformers are obtained.  . Originality. The theory and practice of physical modeling, as well as the similarity theory applied to unsteady electromagnetic processes in powerful transformer equipment for special purposes were further developed. A set of distinctive features of test conditions and their registration were formed. Practical value. Application of physical modeling of unsteady electromagnetic processes at the design and manufacture stages of power transformers for power supply systems of electric arc furnaces, rolling mill drives, etc., as well as during the refinement of general-purpose power transformers.

scholarly journals Design of 3D Additively Manufactured Hybrid Structures for Cranioplasty

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 181
Author(s):  
Roberto De Santis ◽  
Teresa Russo ◽  
Julietta V. Rau ◽  
Ida Papallo ◽  
Massimo Martorelli ◽  
...  
Keyword(s):  
Physical Models ◽  
Cranial Bone ◽  
Head Model ◽  
Rigid Sphere ◽  
Element Analysis ◽  
Aliphatic Polyesters ◽  
Hybrid Device ◽  
Wide Range ◽  
Hybrid Devices ◽  
Technical Solutions

A wide range of materials has been considered to repair cranial defects. In the field of cranioplasty, poly(methyl methacrylate) (PMMA)-based bone cements and modifications through the inclusion of copper doped tricalcium phosphate (Cu-TCP) particles have been already investigated. On the other hand, aliphatic polyesters such as poly(ε-caprolactone) (PCL) and polylactic acid (PLA) have been frequently investigated to make scaffolds for cranial bone regeneration. Accordingly, the aim of the current research was to design and fabricate customized hybrid devices for the repair of large cranial defects integrating the reverse engineering approach with additive manufacturing, The hybrid device consisted of a 3D additive manufactured polyester porous structures infiltrated with PMMA/Cu-TCP (97.5/2.5 w/w) bone cement. Temperature profiles were first evaluated for 3D hybrid devices (PCL/PMMA, PLA/PMMA, PCL/PMMA/Cu-TCP and PLA/PMMA/Cu-TCP). Peak temperatures recorded for hybrid PCL/PMMA and PCL/PMMA/Cu-TCP were significantly lower than those found for the PLA-based ones. Virtual and physical models of customized devices for large cranial defect were developed to assess the feasibility of the proposed technical solutions. A theoretical analysis was preliminarily performed on the entire head model trying to simulate severe impact conditions for people with the customized hybrid device (PCL/PMMA/Cu-TCP) (i.e., a rigid sphere impacting the implant region of the head). Results from finite element analysis (FEA) provided information on the different components of the model.

Rowing electric installations: overview, analysis, development prospects

2022 ◽  
Author(s):  
Aleksey Burkov ◽  
Viktor Mihanoshin
Keyword(s):  
Power Plants ◽  
Theory And Practice ◽  
Power Engineering ◽  
Educational Institutions ◽  
Propulsion Systems ◽  
Ship Propulsion ◽  
Electrical Systems ◽  
Overview Analysis ◽  
Technical Solutions ◽  
Development Prospects

The monograph provides an overview and analysis of ship's rowing electrical installations, modern scientific and technical solutions aimed at improving the theory and practice of electrical systems of ship propulsion systems are considered. Solutions of urgent problems related to the development of rowing electric installations of small-tonnage vessels based on the introduction of combined power plants, including electrochemical sources of electricity (batteries), are proposed. It is intended for scientific and educational purposes and is aimed at specialists in the field of ship power engineering, cadets and students of electromechanical specialties of educational institutions.

scholarly journals Motions models of a two-wheeled experimental sample

2021 ◽  
pp. 40-49
Author(s):  
Anatoliy Kulik ◽  
Konstantin Dergachov ◽  
Sergey Pasichnik ◽  
Sergey Yashyn
Keyword(s):  
Automatic Control ◽  
State Space ◽  
Experimental Model ◽  
Functional Properties ◽  
Angular Position ◽  
The Body ◽  
Angular Motion ◽  
Physical Models ◽  
Experimental Sample ◽  
Electric Drives

The subject of study is the physical processes of translational and angular motion of a two-wheeled experimental sample. The goal is to develop physical, mathematical, and graphic models of the translational and angular motions of a two-wheeled experimental sample as an object of automatic control. The objectives: to form physical models of a two-wheeled experimental sample; to develop a nonlinear mathematical description of the processes of translational and angular sample`s motions using the Lagrange approach; to obtain a linearized mathematical sample`s description as an object of automatic control in the state space and frequency domain; to generate graphic models in the form of structural diagrams in the time and frequency domains; to analyze the functional properties of an object of automatic control: stability, controllability, observability, structural and signal diagnosability concerning violations of the functional properties of electric drives and sensors of the angular position of the body and wheels. The methods of the study: the Lagrange method, Taylor series, state-space method, Laplace transformations, Lyapunov, Kalman criteria, and diagnosability criterion. The results: physical models of a two-wheeled experimental sample have been obtained in the form of a kinematic diagram of the mechanical part and the electric circuit of an electric drive; mathematical descriptions of translational and angular motions have been developed in nonlinear and linearized forms; structural diagrams have been developed; functional characteristics of a two-wheeled experimental model as an object of automatic control have been analyzed to solve problems of control algorithms synthesis. Conclusions. The scientific novelty lies in obtaining new models that describe the translational and angular motion of a two-wheeled experimental model as an object of automatic control. The obtained models differ from the known ones by considering the dynamic properties of sensors and electric drives, as well as the relationship of movements.

scholarly journals Mathematical and physical modeling of the coal–water fuel particle ignition with a liquid film on the surface

2020 ◽  
Vol 6 ◽  
pp. 628-643
Author(s):  
Vladimir Salomatov ◽  
Geniy Kuznetsov ◽  
Semen Syrodoy ◽  
Nadezhda Gutareva
Keyword(s):  
Liquid Film ◽  
Physical Modeling ◽  
Fuel Particle ◽  
Particle Ignition ◽  
Mathematical And Physical Modeling

An Assessment of Slag Eye Formation Using Mathematical and Physical Modeling

2016 ◽  
pp. 1127-1134
Author(s):  
Augusto Pereira de Sá ◽  
Filipe Menezes de Torres ◽  
Carlos Antonio da Silva ◽  
Itavahn Alves da Silva ◽  
Varadarajan Seshadri
Keyword(s):  
Physical Modeling ◽  
Mathematical And Physical Modeling ◽  
Eye Formation

Mathematical and Physical Modeling of the Rolling Process of Tapered Shafts for Aviation Purposes

2016 ◽  
pp. 009-016 ◽  
Author(s):  
R.Yu. Sukhorukov ◽  
◽  
A.A. Sidorov ◽  
A.I. Alimov ◽  
M.I. Nagimov ◽  
...  
Keyword(s):  
Physical Modeling ◽  
Rolling Process ◽  
Mathematical And Physical Modeling
Sign in / Sign up

Export Citation Format

Share Document