Arbitrary Blade Section Design Based on Viscous Considerations. Blade Optimization

1996 ◽  
Vol 118 (2) ◽  
pp. 364-369
Author(s):  
B. Bouras ◽  
F. Karagiannis ◽  
P. Chaviaropoulos ◽  
K. D. Papailiou
Keyword(s):  
Optimization Design ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Shear Layers ◽  
Turbulent Shear ◽  
Design And Optimization ◽  
Blade Optimization ◽  
Blade Shape ◽  
Section Design ◽  
Blade Section

A blade design and optimization procedure is presented in this work, which is based on viscous flow considerations. This procedure concerns the design of optimum rotating arbitrary compressible high subsonic compressor and turbine blade shapes. It takes into account the effects of wall curvature and Coriolis force on turbulence, while it allows the variation of stream surface radius, along which the blade shape is placed, as well as streamtube width, with meridional distance. In order to establish the inverse part of the viscous optimization procedure, aspects such as laminar stability, transition, optimum deceleration and, more generally, the behaviour of compressible attached and separated shear layers are discussed. A plane on which all the general properties of the compressible laminar and turbulent shear layers appear, is constructed and the generation of optimum shear layers for the critical side of the blade shape is established. The complete optimization (design) procedure is then described and discussed, while various designs realized by the present procedure are presented at the end of this paper.

Arbitrary Blade Section Design Based on Viscous Considerations. Background Information

1996 ◽  
Vol 118 (2) ◽  
pp. 358-363 ◽  
Author(s):  
B. Bouras ◽  
F. Karagiannis ◽  
G. Leoutsakos ◽  
K. C. Giannakoglou ◽  
K. D. Papailiou
Keyword(s):  
Viscous Flow ◽  
Design Method ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Shear Layers ◽  
Background Information ◽  
Joint Paper ◽  
Blade Optimization ◽  
Section Design ◽  
Blade Section

Background information is presented on an arbitrary blade section design method which is outlined in a joint paper. This information concerns the assumptions, the development, and the predictive capabilities of the viscous flow calculation tool used in the design procedure. General properties of laminar and turbulent, unseparated or separated compressible shear layers, necessary for the blade optimization procedure, are discussed.

scholarly journals A New Design Procedure for Rotor Laminations of Synchronous Reluctance Machines with Fluid Shaped Barriers

Electronics ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 134
Author(s):  
Federica Uberti ◽  
Lucia Frosini ◽  
Loránd Szabó
Keyword(s):  
Finite Element ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Torque Ripple ◽  
Stator Winding ◽  
Post Processing ◽  
Processing Stage ◽  
Synchronous Reluctance Machine ◽  
Design And Optimization ◽  
Reluctance Machine

A new procedure for the design and optimization of the rotor laminations of a synchronous reluctance machine is presented in this paper. The configuration of the laminations is symmetrical and contains fluid-shaped barriers. The parametrization principle is used, which executes variations in the lamination geometry by changing the position, thickness and shape of the flux barriers. Hence, the optimization procedure analyzes the various configurations through finite element simulations, by means of the communication between MATLAB and Flux 2D. In the post processing stage, the best geometry which optimizes mean torque, torque ripple, efficiency and power factor is selected. Once the best rotor configuration is defined, further investigations allow improving its performance by modifying the current angle, the stator winding and the thickness of the radial ribs.

An educational tool based on finite element method for electromagnetic study

2020 ◽  
pp. 002072092094057
Author(s):  
Nisha Prasad ◽  
Shailendra Jain ◽  
Sushma Gupta
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Magnetic Fields ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Educational Tool ◽  
Non Linear Circuit ◽  
Design And Optimization ◽  
Technical Students ◽  
Element Method

Electromagnetism forms a mandatory topic in the syllabus of undergraduate and graduate courses in electrical engineering. This topic involves many physical and mathematical concepts like curl, divergence, gradient for field determination and representation. These concepts are not only difficult to understand but also often lead to poor learning because of the imaginations and non-visualization of electric and magnetic fields. A correct understanding of fields and its distribution is necessary to understand the working, design and optimization of electrical machines. This paper presents a finite element method (FEM) based educational tool that allows the technical students to visualize electromagnetic (EM) fields inside the EM systems. This tool therefore provides a better understanding of the design and optimization of various electrical devices. This paper shows an example of a 2-pole linear machine to visualize the distribution of the magnetic field in a non-linear circuit. This machine extends to form a linear switched reluctance motor (LSRM) using step-by-step design and optimization procedure along with the user guide interface programmed in FEM based ANSYS Maxwell software. This motor is used as an example to visualize magnetic fields using FEM software in complex circuits and can be used as a good educational tool for students. The paper incorporates the validation of the design procedure through FEM simulations.

Optimization design, manufacturing and mechanical performance of box girder made by carbon fiber-reinforced epoxy composites

2018 ◽  
Vol 25 (2) ◽  
pp. 297-307 ◽  
Author(s):  
Bin Yang ◽  
Lili Tong ◽  
Cheav Por Chea
Keyword(s):  
Composite Structures ◽  
Optimization Design ◽  
High Efficiency ◽  
Mechanical Performance ◽  
Parametric Design ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Experimental Tests ◽  
Bending Test ◽  
Box Girder

AbstractOptimization design and manufacturing play an important role in obtaining successful composite structures with high efficiency and safe use of materials. In this paper, we first present the optimization design procedure for a composite box girder by ANSYS parametric design language (APDL) in the ANSYS software. The input parameters used in the simulation work were determined via fundamental experimental tests of composite specimens. Then we manufactured the designed composite box girder by mold-pressing prepreg technology according to the optimization results. The finial composite girder structure composed of arch top, web and bottom composite plate was obtained. The optimization procedure indicated that the use of stiffening plates in a girder could decrease the weight and increase the failure load. The location and ply mode of the stiffening plates in girder were suggested. The three-point-bending test was performed on the girder, and the test indicated that load-carrying capacity in unit mass of the optimized girder was as high as 107.8 N/g. Simulation and experimental results match well, and the maximum and minimum stresses in each layer were within the strength limitation of carbon material after optimized in the procedure.

High-Performance Computer-Aided Optimization of Viscous Dampers for Improving the Seismic Performance of a Tall Steel Building

2018 ◽  
Vol 763 ◽  
pp. 502-509
Author(s):  
Shan Shan Wang ◽  
Stephen Mahin
Keyword(s):  
Seismic Performance ◽  
Earthquake Engineering ◽  
High Performance ◽  
Optimization Design ◽  
Nonlinear Dynamic Analysis ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Viscous Dampers ◽  
Safety Level ◽  
Fluid Viscous Dampers

Using fluid viscous dampers (FVDs) has been demonstrated to be an effective method to improve seismic performance of new and existing buildings. In engineering applications, designs of these dampers mainly rely on trial and error, which could be repetitive and labor intensive. To improve this tedious manual process, it is beneficial to explore more formal and automated approaches that rely on recent advances in software applications for nonlinear dynamic analysis, performance-based evaluation, and workflow management and the computational power of high-performance, parallel processing computers. The optimization design procedure follows the framework of Performance Based Earthquake Engineering (PBEE) and uses an automatic tool that incorporates an optimization engine and structural analysis software: Open System for Earthquake Engineering Simulation (OpenSEES). An existing 35-story steel moment frame is selected as a case-study building for verification of this procedure. The goal of the retrofit design of FVDs is to improve the building’s seismic behavior that focuses on avoiding collapse under a basic-safety, level-2 earthquake (BSE-2E). The objective of the optimization procedure is to reduce the building’s total loss under a BSE-2E event and optimal damper patterns will be proposed. The efficiency of the optimization procedure will be demonstrated and compared with a manual refinement procedure.

An approach to the sizing of electric motors devoted to aerospace propulsion systems

2014 ◽  
Vol 33 (5) ◽  
pp. 1527-1540 ◽  
Author(s):  
Ikhlas Bouzidi ◽  
Nicola Bianchi ◽  
Ahmed Masmoudi
Keyword(s):  
Design Procedure ◽  
Optimization Procedure ◽  
Geometrical Parameters ◽  
Propulsion Systems ◽  
Permanent Magnet Synchronous Motors ◽  
Element Analysis ◽  
Content Type ◽  
Design And Optimization ◽  
Aerospace Applications ◽  
Aerospace Propulsion

Purpose – The purpose of this paper is to deal with the design and optimization of permanent magnet synchronous motors (PMSM) devoted to aeronautic applications. Design/methodology/approach – A design approach as well as a performance investigation, based on two-dimensional finite element analysis of selected electromagnetic and thermal features, are applied to chosen PM synchronous machine topologies which differ by their number of phases. Findings – It has been found that the initial set of geometrical parameters does not fulfill the torque/weight compromise required by a aeronautic applications since it leads to an average temperature rise higher than the authorized limit (class H: 155 K). Therefore, the sizing has been rethought in an attempt to meet the constraints of the considered application. Research limitations/implications – Several continuations of the developed works shall be treated in the future, such as: (i) the prototyping of the designed machines, (ii) extending the optimization procedure to the whole drive including the motor and the associated static converter, and (iii) the synthesis and implementation of a dedicated control strategy with a suitable emulation of the load. Practical implications – The studied machines could be integrated in aerospace propulsion systems. Originality/value – The paper develops a design procedure of PMSM dedicated to aerospace applications where the compromise between torque/weight/temperature represents a crucial design challenge.

scholarly journals A Two-Round Optimization Design Method for Aerostatic Spindles Considering the Fluid–Structure Interaction Effect

2021 ◽  
Vol 11 (7) ◽  
pp. 3017
Author(s):  
Qiang Gao ◽  
Siyu Gao ◽  
Lihua Lu ◽  
Min Zhu ◽  
Feihu Zhang
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Design Method ◽  
Fluid Structure Interaction ◽  
Design Procedure ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Aerostatic Spindle

The fluid–structure interaction (FSI) effect has a significant impact on the static and dynamic performance of aerostatic spindles, which should be fully considered when developing a new product. To enhance the overall performance of aerostatic spindles, a two-round optimization design method for aerostatic spindles considering the FSI effect is proposed in this article. An aerostatic spindle is optimized to elaborate the design procedure of the proposed method. In the first-round design, the geometrical parameters of the aerostatic bearing were optimized to improve its stiffness. Then, the key structural dimension of the aerostatic spindle is optimized in the second-round design to improve the natural frequency of the spindle. Finally, optimal design parameters are acquired and experimentally verified. This research guides the optimal design of aerostatic spindles considering the FSI effect.

Sign in / Sign up

Export Citation Format

Share Document