Optimization Problem of a Linear Induction Generator with a Liquid Working Fluid

2021 ◽  
Vol 64 (6) ◽  
pp. 16-21
Author(s):  
Konstantin Kim ◽  
◽  
Konstantin Kim ◽  
Andrey Vataev ◽  
◽  
...  
Keyword(s):  
Computer Technology ◽  
Optimization Problem ◽  
Magnetic System ◽  
Optimality Criteria ◽  
Working Fluid ◽  
Conducting Liquid ◽  
Calculation Algorithm ◽  
Linear Induction ◽  
Induction Generators ◽  
Calculation Results

We present the problem of optimization of cylindrical linear induction generators. The stator winding is located on the inner and outer cores of the magnetic system. The working fluid is a well-conducting liquid moving at a constant speed along the length of the channel. Since the generator is one of the elements of a complex installation the problem of optimizing it should be coordinated with a similar problem for the installation as a whole. This is done with the help the parameters common to all installation elements. Such parameters are the speed and flow rate of the working fluid. We describe the calculation algorithm with the use of computer technology. The efficiency and specific gravity of the generator are accepted as optimality criteria. The calculation results for a generator with the power of 20 MW are presented.

Optimization of a Closed-Cycle OTEC System

1990 ◽  
Vol 112 (4) ◽  
pp. 247-256 ◽  
Author(s):  
Haruo Uehara ◽  
Yasuyuki Ikegami
Keyword(s):  
Heat Exchangers ◽  
Sea Water ◽  
Working Fluid ◽  
Turbine Efficiency ◽  
Thermal Energy Conversion ◽  
Calculation Results ◽  
Change Temperature ◽  
Ocean Thermal Energy ◽  
Powell Method ◽  
Method Of Steepest Descent

Optimization of an Ocean Thermal Energy Conversion (OTEC) system is carried out by the Powell Method (the method of steepest descent). The parameters in the objective function consist of the velocities of cold sea water and warm sea water passing through the heat exchangers, the phase change temperature, and turbine configuration (specific speed, specific diameter, ratio of blade to diameter). Numerical results are shown for a 100-MW OTEC plant with plate-type heat exchangers using ammonia as working fluid, and are compared with calculation results for the case when the turbine efficiency is fixed.

scholarly journals Optimization of the truss beam. Verification of the calculation results

2018 ◽  
Vol 230 ◽  
pp. 02037 ◽  
Author(s):  
Glib Vatulia ◽  
Sophia Komagorova ◽  
Mykhailo Pavliuchenkov
Keyword(s):  
Theoretical Calculations ◽  
Optimality Criteria ◽  
Constant Load ◽  
Bending Moments ◽  
Convergence Criteria ◽  
Variable Parameters ◽  
Software Complex ◽  
Comparison Of Results ◽  
Calculation Results ◽  
Construction Optimization

The article presents a comparison of results of optimized calculation of a truss beam which was chosen as a combined construction. The results of calculation of a beam are compared using the method based on the properties of spacer systems and the calculation of the construction designed in LIRA software complex. The article is dedicated to verification of adequacy of the results of theoretical calculations of construction optimization. Values of longitudinal forces and bending moments appearing in a truss beam are chosen as convergence criteria. Two variants of construction loading are considered: a truss beam exposed to constant load only and a truss beam exposed to constant and temporary load. In the case under consideration, the minimum value (weight) of construction is an optimality criteria, variable parameters include beam panel length and camber height of a trussing rod. As a result, the construction will be considered optimal, if bearing and maximal (between the pillars) bending moments are equal in it. The result of verification of the obtained data is the value of error.

Analysis and design of a modular underactuated mechanism for robotic fingers

2011 ◽  
Vol 226 (1) ◽  
pp. 242-256 ◽  
Author(s):  
S Yao ◽  
M Ceccarelli ◽  
Q Zhan ◽  
G Carbone ◽  
Z Lu
Keyword(s):  
Optimization Problem ◽  
Modular Design ◽  
Optimality Criteria ◽  
Design Problems ◽  
Design Algorithm ◽  
Underactuated Mechanism ◽  
Analysis And Design ◽  
Design Concepts ◽  
Practical Feasibility ◽  
Robotic Fingers

This paper presents an analysis of the design problems and requirements for underactuated mechanisms for robotic fingers. The case of performing a grasping task is considered and a solution is proposed that consists of a series of linked underactuated mechanisms. Optimality criteria are analysed with the aim of formulating a general design algorithm based on a suitable optimization problem. An example of a four-phalanx modular finger is used to highlight the practical feasibility of the proposed modular design concepts and procedures.

An optimum design procedure for both serial and parallel manipulators

2007 ◽  
Vol 221 (7) ◽  
pp. 829-843 ◽  
Author(s):  
G Carbone ◽  
E Ottaviano ◽  
M Ceccarelli
Keyword(s):  
Optimization Problem ◽  
Design Procedure ◽  
Parallel Manipulators ◽  
Optimality Criteria ◽  
Design Stage ◽  
Multi Objective Optimization ◽  
Numerical Examples ◽  
Design Optimality ◽  
Basic Performance ◽  
Alternative Solutions

Serial and parallel manipulators can be used in different manipulative tasks when their peculiarities in kinematic and dynamic behaviours are properly considered from the design stage. The basic performance in workspace, mobility constraints, and stiffness makes them alternative solutions and not competitive manipulator chains. Thus, it is convenient to deduce a common design procedure that considers common design criteria, but specific numerical evaluations. In this paper, a multi-objective optimization problem has been proposed to formulate a unique design procedure that takes into account the contradicting design optimality criteria in terms of suitable general algorithms for workspace volumes, Jacobian matrices, and compliant displacements. Numerical examples are reported to show not just the feasibility but also the numerical efficiency of the proposed formulations.

scholarly journals Simulation of Transient Processes in a Generator-Transformer-Load System with Non-Symmetry of Phase Windings of the Stator and Saturation of the Magnetic System

2019 ◽  
pp. 939-951
Author(s):  
Gleb V. Glazyrin ◽  
Nikolay A. Mitrofanov
Keyword(s):  
Magnetic System ◽  
Synchronous Machine ◽  
Transient Processes ◽  
Stator Winding ◽  
System A ◽  
Voltage Drops ◽  
Phase Coordinates ◽  
Calculation Results ◽  
Unequal Number ◽  
Short Circuits

Transient processes of a generator-transformer-load system are considered taking into account the saturation of its magnetic system. A method is proposed for numerical simulation of the transient processes of a synchronous machine with the possibility of taking into account the asymmetry of the stator winding and the saturation of the magnetic system. The appearance of asymmetry is possible if the synchronous machine is damaged, in particular, during inter-turn short circuits in the stator winding. It is based on the direct solution of the differential equations of equilibrium of the emf and voltage drops in the windings in phase coordinates together with the equation of motion of the rotor. In this case, the contour of each phase winding of the stator is described by a separate equation, and different phase parameters can be taken into account. The mathematical model of the system is realized in the software package MATLAB. The model takes into account one of the possible types of nonsymmetry – an unequal number of turns in phase windings, which makes it possible to simulate interturn short circuits without taking into account the appearance of additional short-circuited circuits. The model was verified by comparing the transient calculation results obtained using the developed model and using the MATLAB Simulink tools. The simulation results for the idle and load modes are analyzed. The obtained results allowed to draw a conclusion about the adequacy of the realized model

scholarly journals The use of organic zeotropic mixture with high temperature glide as a working fluid in medium-temperature vapor power plant

2017 ◽  
Vol 21 (2) ◽  
pp. 1153-1160 ◽  
Author(s):  
Aleksandra Borsukiewicz
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Electrical Energy ◽  
Hot Water ◽  
Working Fluid ◽  
Large Temperature ◽  
Medium Temperature ◽  
Calculation Results ◽  
Zeotropic Mixture ◽  
Selection Of

The paper presents the idea of using organic substances as working fluids in vapor power plants, in order to convert the low and medium temperature thermal energy sources into electrical energy. The calculation results of the power plant efficiency for butane-ethane zeotropic mixtures of different mass compositions, for the power plant supplied with hot water having a temperature of 120?C. Based on the results of thermal-flow calculations it was found that the use of zeotropic mixture does not allow to increase the efficiency and output of the power plant (these values appeared as slightly lower ones). However, it was found that, through the selection of a mixture of sufficiently large temperature glide, the heat exchange surface of the condenser can be reduced or a co-generation system can be implemented.

scholarly journals Thermodynamic Analysis of a Hybrid Power System Combining Kalina Cycle with Liquid Air Energy Storage

Entropy ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 220 ◽  
Author(s):  
Tong Zhang ◽  
Xuelin Zhang ◽  
Xiaodai Xue ◽  
Guohua Wang ◽  
Shengwei Mei
Keyword(s):  
Energy Storage ◽  
Energy System ◽  
Working Fluid ◽  
Operating Pressure ◽  
Kalina Cycle ◽  
Electricity Grid ◽  
Fluid Concentration ◽  
Calculation Results ◽  
Integrated Energy System ◽  
Energetic Model

Liquid air energy storage (LAES) is a promising energy storage technology in consuming renewable energy and electricity grid management. In the baseline LAES (B-LAES), the compression heat is only utilized in heating the inlet air of turbines, and a large amount of compression heat is surplus, leading to a low round-trip efficiency (RTE). In this paper, an integrated energy system based on LAES and the Kalina cycle (KC), called KC-LAES, is proposed and analyzed. In the proposed system, the surplus compression heat is utilized to drive a KC system to generate additional electricity in the discharging process. An energetic model is developed to evaluate the performance of the KC and the KC-LAES. In the analysis of the KC subsystem, the calculation results show that the evaporating temperature has less influence on the performance of the KC-LAES system than the B-LAES system, and the optimal working fluid concentration and operating pressure are 85% and 12 MPa, respectively. For the KC-LAES, the calculation results indicate that the introduction of the KC notably improves the compression heat utilization ratio of the LAES, thereby improving the RTE. With a liquefaction pressure value of eight MPa and an expansion pressure value of four MPa, the RTE of the KC-LAES is 57.18%, while that of the B-LAES is 52.16%.

Topology Optimization With Multiple Constraints

1995 ◽  
Author(s):  
R. J. Yang
Keyword(s):  
Finite Element ◽  
Topology Optimization ◽  
Optimization Problem ◽  
Optimality Criteria ◽  
Topology Design ◽  
Structural Components ◽  
Material Density ◽  
Structural Responses ◽  
Mathematical Programming Method ◽  
General Optimization Problem

Abstract Topology optimization is used for determining the best layout of structural components to achieve predetermined performance goals. The density method which uses material density of each finite element as the design variable is employed. Unlike the most common approach which uses the optimality criteria methods, the topology design problem is formulated as a general optimization problem and is solved by the mathematical programming method. One of the major advantages of this approach is its generality; thus it can solve various problems, e.g. multi-objective and multi-constraint problems. In this study, the structural weight is chosen as the objective function and structural responses such as the compliances, displacements, and the natural frequencies are treated as the constraints. The MSC/NASTRAN finite element code is employed for response analyses. One example with four different optimization formulations was used to demonstrate this approach.

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