scholarly journals Experience in the formation of power elements of an aircraft wing using topological optimization approaches

2020 ◽  
pp. 88-96
Author(s):  
Yaroslav Khrebtiievskyi ◽  
Vitaliy Sukhov ◽  
Yaroslav Kozei
Keyword(s):  
Optimization Methods ◽  
Topological Optimization ◽  
Design Stage ◽  
Aircraft Wing ◽  
Aircraft Structures ◽  
Software Packages ◽  
Number Of Publications ◽  
Technical Solutions ◽  
Quantitative Indicators ◽  
Intensive Search

The process of designing aircraft structures, in most cases, involves finding solutions that will minimize weight, while maintaining the characteristics of strength and rigidity. To increase the mass efficiency of the aircraft glider, it is proposed to carry out topological optimization of structural and power elements at the initial stages of design with the help of modern software packages. Modern wings of traditional forms are close to exhausting their aerodynamic and weight characteristics, so all over the world there is an intensive search for new technical solutions. This indicates the relevance of developing new methods that use high-precision mathematical modeling in the early stages of design. Despite the significant number of publications on the topic of mass optimization, including aircraft structures, there are no quantitative indicators of the magnitude of the possible minimization of mass by topological optimization methods for the main structural and power elements of the aircraft wing. The article describes the results of the analysis of the effectiveness of the use of topological optimization methods to minimize the mass of the main structural and power elements of the aircraft wing. For a typical, typesetting structural and power scheme of a light aircraft wing, the values of possible minimization of the glider mass were determined. The use of topological optimization at the design stage of the power elements of the aircraft glider makes it possible to significantly reduce the mass of the main structural and power elements and allows to significantly reduce the takeoff mass of the aircraft. This approach using the results of optimization can be used to determine rational power schemes and predict the mass of the wings, taking into account the peculiarities of their geometric shapes and boundary conditions.

scholarly journals GENERATIVE DESIGN OF A FRAME TYPE CONSTRUCTION

2021 ◽  
Author(s):  
Ihor V. Mastenko ◽  
Nataliia V. Stelmakh
Keyword(s):  
Rational Design ◽  
Rapid Development ◽  
Optimization Methods ◽  
Geometric Constraints ◽  
Topological Optimization ◽  
Design Stage ◽  
Physical Constraints ◽  
Specific Strength ◽  
Cad Cam ◽  
Type Construction

Background. In recent years, there has been a rapid development of the domestic military industry. Reducing the mass and increasing the specific strength of military products used in the field – the most pressing challenges facing engineers and scientists today. The rapid development of adaptive production has significantly expanded the possibilities of methods of topological optimization in the design of new products or improvement of existing design and technological solutions in order to reduce weight. Objective. The purpose of the paper is to improve the efficiency of designing the technology of manufacturing a frame type construction based on the method of topological optimization, which will reduce the weight of the product, while maintaining all the specified functional parameters. Methods. The paper presents an analysis of topological optimization methods and offers the interaction of modern ADS, namely CAD, CAM, CAE modules at the stage of design and technological preparation of production, which once again demonstrated its effectiveness in solving problems to reduce product weight. Results. The main tasks of topological optimization were solved for the frame type constructions, such as the minimization of volume and mass under physical constraints, as well as the optimization of other parameters with given geometric constraints. As a result, the proposed method of reducing the weight of the product is improved, which due to rational design and technological measures ensured a 56 % reduction in the weight of the frame type structure from the original and reduced the complexity of the manufacturing process by 22 % due to its effective adaptation to new technological conditions. Conclusions. The application of methods of topological optimization and rational establishment of design and technological constraints on products at the design stage can be very effective in solving problems of reducing the weight of products and optimizing manufacturing processes.

scholarly journals A METHODOLOGY TO SUPPORT COMPANIES IN THE FIRST STEPS TOWARDS DE-MANUFACTURING

2021 ◽  
Vol 1 ◽  
pp. 131-140
Author(s):  
Federica Cappelletti ◽  
Marta Rossi ◽  
Michele Germani ◽  
Mohammad Shadman Hanif
Keyword(s):  
Environmental Impact ◽  
End Of Life ◽  
Design Stage ◽  
Life Strategies ◽  
Disassembly Sequence ◽  
The Status ◽  
The Cost ◽  
Technical Solutions ◽  
First Time ◽  
Complex Activities

AbstractDe-manufacturing and re-manufacturing are fundamental technical solutions to efficiently recover value from post-use products. Disassembly in one of the most complex activities in de-manufacturing because i) the more manual it is the higher is its cost, ii) disassembly times are variable due to uncertainty of conditions of products reaching their EoL, and iii) because it is necessary to know which components to disassemble to balance the cost of disassembly. The paper proposes a methodology that finds ways of applications: it can be applied at the design stage to detect space for product design improvements, and it also represents a baseline from organizations approaching de-manufacturing for the first time. The methodology consists of four main steps, in which firstly targets components are identified, according to their environmental impact; secondly their disassembly sequence is qualitatively evaluated, and successively it is quantitatively determined via disassembly times, predicting also the status of the component at their End of Life. The aim of the methodology is reached at the fourth phase when alternative, eco-friendlier End of Life strategies are proposed, verified, and chosen.

scholarly journals A Comprehensive Study on the Optimal Design of Magnetorheological Dampers for Improved Damping Capacity and Dynamical Adjustability

Actuators ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 64
Author(s):  
Liankang Wei ◽  
Hongzhan Lv ◽  
Kehang Yang ◽  
Weiguang Ma ◽  
Junzheng Wang ◽  
...  
Keyword(s):  
Optimal Design ◽  
Optimization Methods ◽  
Design Stage ◽  
Damping Capacity ◽  
Damping Force ◽  
Simulation And Optimization ◽  
Damping Characteristics ◽  
Hysteretic Characteristics ◽  
Gap Width ◽  
Comprehensive Study

Purpose: We aim to provide a systematic methodology for the optimal design of MRD for improved damping capacity and dynamical adjustability in performing its damping function. Methods: A modified Bingham model is employed to model and simulate the MRD considering the MR fluid’s compressibility. The parameters that describe the structure of MRD and the property of the fluid are systematically examined for their contributions to the damping capacity and dynamically adjustability. A response surface method is employed to optimize the damping force and dynamically adjustable coefficient for a more practical setting related to the parameters. Results: The simulation system effectively shows the hysteretic characteristics of MRDs and shows our common sense understanding that the damping gap width and yoke diameter have significant effects on the damping characteristics of MRD. By taking a typical MRD device setup, optimal design shows an increase of the damping force by 33% and an increase of the dynamically adjustable coefficient by 17%. It is also shown that the methodology is applicable to other types of MDR devices. Conclusion: The compressibility of MR fluid is one of the main reasons for the hysteretic characteristics of MRD. The proposed simulation and optimization methods can effectively improve the MRD’s damping performance in the design stage.

scholarly journals Оптимизация алюминиевой крышки люкового закрытия сухогрузного судна

2020 ◽  
Author(s):  
G.B. Kryzhevich ◽  
A.R. Filatov
Keyword(s):  
Shape Optimization ◽  
Parametric Optimization ◽  
Optimization Methods ◽  
Topological Optimization ◽  
Design And Technology ◽  
Bulk Carrier ◽  
Material Consumption ◽  
Considerable Decrease ◽  
Bulk Carriers ◽  
Cargo Transportation

Объектом исследования является крышка люкового закрытия сухогрузного судна, служащая для обеспечения непроницаемости грузовых помещений и перевозки на ней грузов и обеспечивающая безопасность сухогрузных судов и осуществляемой на них морской перевозки грузов. Большая материалоемкость крышек снижает экономическую эффективность судна, ведет к необходимости использования мощных и массогабаритных средств подъема крышек (для съемных люковых закрытий), либо поворота и передвижения крышек (для шарнирно-откидных закрытий). Целью статьи является существенное снижение материалоемкости крышек люкового закрытия за счет рационального выбора их материала и конструктивного оформления при одновременном обеспечении требуемого уровня их надежности. Параметрическая оптимизация традиционной стальной крышки люкового закрытия сухогрузного судна проекта RSD59 может привести к снижению ее массы не более чем на 15-17. Поэтому для достижения цели работы решается задача оптимизации конструкции алюминиевой крышки на основе комплексного подхода, состоящего в последовательном использовании топологических и параметрических оптимизационных методов и выполнении на последней стадии работы снижения уровня концентрации напряжений путем оптимизации формы узлов крышки. При этом на стадии выбора конструктивно-силовой схемы крышки применяются приёмы топологической оптимизации, на стадии выбора толщин и параметров силовых элементов способы параметрической оптимизации, а на стадии конструктивно-технологического оформления узлов методы оптимизации формы. Выполненные расчетные исследования привели к следующим основным результатам: к выявлению прогрессивных конструктивно-силовых схем и конструктивно-технологических решений, обеспечивающих значительное снижению массы крышек люковых закрытий при умеренных затратах на их изготовление к высоким оценкам эффективности использования современных алюминиевых сплавов для изготовления люковых закрытий, способствующим существенному снижению их материалоемкости (примерно двукратному и более по сравнению с использованием стали), улучшению условий их функционирования и проведения погрузочно-разгрузочных работ на сухогрузных судах к выводу об эффективности использования разработанных конструкторских решений для крышек люковых закрытий при создании перспективных сухогрузных судов.A bulk carrier hatch cover, which provides cargo compartments impermeability and cargo transportation on the cover, as well as safety of bulk carriers and sea cargo transportation in them, is studied. Cover high material consumption decreases vessel profitability, causes the necessity to use either powerful and mass-dimensional cover lifting devices (for removable hatch covers) or covers rotation and movement (for hinged covers). The purpose of this paper consists in considerable decrease of hatch cover material consumption through rational selection of covers material and design at provision of the required covers reliability level. Parametric optimization of a conventional steel cover of RSD59 project bulk carrier could result in cover mass decrease by more than 15 to 17. Therefore, to achieve the work purpose, a problem of aluminum cover structural optimization was solved based on a comprehensive approach that consisted in successive use of topologic and parametric optimization methods and decrease of the stress concentration level at the last step via cover assemblies shape optimization. At that topological optimization methods were applied at the stage of selecting cover structural arrangement parametric optimization methods were applied at the stage of selecting load-carrying elements thickness and parameters, and shape optimization methods were used at the stage of structural and technology design of assemblies. The performed calculation studies resulted in the following: revealing the advanced structural arrangements and design and technology solutions that provide considerable hatch covers mass decrease at reasonable costs for their manufacture high assessment of using advanced aluminum alloys for manufacturing hatch covers that promote considerable decrease of their material consumption (approximately up to twofold or greater in comparison with steel), improving conditions of cover functioning and handling operation in bulk carriers conclusion on effectiveness of using developed design solutions for hatch covers when creating prospective bulk carriers.

ARAMID ORGANOPLASTICS FOR INCREASING THE BIRD RESISTANCE OF ELEMENTS OF AIRCRAFT STRUCTURES

2021 ◽  
pp. 77-84
Author(s):  
A.Ch. Kan ◽  
◽  
G.F. Zhelezina ◽  
N.A. Solovieva ◽  
◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Aircraft Wing ◽  
Aircraft Structures ◽  
Optimal Ratio ◽  
External Contour ◽  
Impact Tests ◽  
Protective Screen

The possibility of using protective screens made of aramid organoplastics to ensure the bird resistance of carbon fiber wing flaps is investigated. Aramid organoplastics were selected for the production of a protective screen, taking into account the main requirements for the materials of external contour of the aircraft wing. The result of impact tests simulating the collision of a bird with carbon fiber flaps that are not protected and protected by organoplastics are presented. The optimal ratio of aramid organoplastics as part of the protective screen for carbon fiber wing flaps is presented.

Application of Stochastic Optimization Methods in the Gas Turbine Projection Problems

2010 ◽  
Author(s):  
V. E. Afanasjevska ◽  
A. A. Tronchuk ◽  
M. L. Ugryumov
Keyword(s):  
Stochastic Optimization ◽  
Gas Turbine ◽  
Optimization Problems ◽  
Optimization Methods ◽  
Operating Conditions ◽  
Technical System ◽  
Design Stage ◽  
Problem Solution ◽  
Operating Characteristics ◽  
Stochastic Optimization Problem

When projecting the gas turbine an important problem is an ensuring the high values of gas turbine parameters and required gas turbine operating characteristics on the different operating conditions. These requirements can be reached by engine function units system perfecting on base of multicriterion stochastic optimization problems solution. Three stochastic optimization problems definitions were formulated. Each problem has own features and can be used for different application solution. These applied problems are: M-problem can be used on the technical system unit conceptual design stage; V-problem can be used for the problem solution of tolerancing during the technical system unit production; P-problem can be used for interval analysis of technical system functional unit. The multicriterion stochastic optimization problem rational decision is realized by the evolutional method. This method makes it possible to find the solution with given accuracy by attraction the less information recourses than standard methods. In the stochastic optimization problems definitions the input data random character is taken into account. It makes it possible to find the optimal values of desired parameters. These parameters ensure the maximal probability of finding the objective function in given range.

scholarly journals PUBLICATION ACTIVITY OF S. RUSOVA AS A GUARANTEE OF POPULARIZATION OF PROGRESSIVE IDEAS LATE XIX – EARLY XX CENTURIES

2020 ◽  
Vol 9.1 (85.1) ◽  
Author(s):  
Irina Yevdokymenko ◽  
Keyword(s):  
Publication Activity ◽  
Scientific Publications ◽  
Important Indicator ◽  
Public Figure ◽  
The Subject ◽  
Number Of Publications ◽  
Scientific Collections ◽  
Xix Century ◽  
Quantitative Indicators ◽  
Second Period

For more than 70 years, S. Rusova's creative legacy was kept in special repositories, as she was declared a bourgeois nationalist in the Soviet era. Today, the multifaceted pedagogical and educational activities of teachers of European level are available for study and are the subject of scientific research. In our article, using the method of content analysis, quantitative indicators of publication activity of a famous journalist and public figure are determined, because the number of publications is a very important indicator for the recognition of authors, their contribution to science, any field of creative activity. Analyzed how certain historical realities can affect the work of the author, and the productive activities of this author can affect the general state of public opinion in the late nineteenth – early twentieth century. The biobibliographic index «Sofia Rusova – teacher, statesman, teacher», published in 2010 on the occasion of the 155th anniversary of the birth of the famous Ukrainian woman, was chosen as the basis for quantitative calculations. Index created by specialists of DNPB of Ukraine named after V.O. Sukhomlinsky, and is the first biobibliographic publication about S. Rusova in Ukraine. The index contains a list of works and research on the life and multifaceted activities of an outstanding teacher. In order to fully cover the creative work of the scientist, it included bibliographic descriptions of S. Rusova's works and scientific publications devoted to her life, pedagogical and socio-cultural activities, published since the 80s of the XIX century. until 2010, as separate books and articles in scientific collections and periodicals in Ukraine and abroad. Based on the results of calculations, graphs were developed, which indicate the number of publications for each year. The chronological framework of the schedules was established within the framework of the most established periodization of S. Rusova's creative heritage, where four periods in the life of a well-known public figure and publicist are distinguished. Thus, during the first period (end of XIX-1905) 34 publications were published; for the second period (1906–1916) – 136 publications; for the third (1917–1921) – 42 materials; for the fourth period (1922–1940) – 144 publications.

A method of forming a spacecraft adapter layout to meet the requirements of dynamic compatibility by topological and parametric optimization methods

2021 ◽  
Author(s):  
A.A. Borovikov ◽  
O.N. Tushev
Keyword(s):  
Input Data ◽  
Parametric Optimization ◽  
Lower Boundary ◽  
Optimization Methods ◽  
Design Stage ◽  
Rigid Base ◽  
Launch Vehicles ◽  
Natural Vibrations ◽  
Traditional Process ◽  
Strength And Stiffness

At present, the developers of launch vehicles impose a requirement for dynamic compatibility of the spacecraft with the launch vehicle, which consists in limiting the lower boundary of the first transverse and first longitudinal fundamental (primary) frequencies of the natural vibrations of the spacecraft fitted with an adapter of relatively rigid base. One of the tasks that must be solved in order to meet this requirement is the development of the spacecraft adapter layout. The traditional process of designing the adapter consists in developing its design on the basis of analogues and carrying out verification analysis with subsequent refinement of the design to meet the strength and stiffness requirements. However, this approach takes a lot of time and is not adaptable to constant changes in the input data at the initial design stage. The article presents a technique allowing the adapter layout to be quickly designed. The layout is determined to a greater extent by calculations using the topological and parametric optimization methods. The application of the developed technique is shown on the example of the development of an adapter for a promising spacecraft. It should be applied in the early stages of design. The results obtained by the method should be used as input data and recommendations for the design of the adapter.

Design of Transverse-Plane Bulkheads in Tankers

1976 ◽  
Vol 20 (02) ◽  
pp. 67-78
Author(s):  
Carl Arne Carlsen ◽  
Dag Kavlie
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Unconstrained Minimization ◽  
Optimization Methods ◽  
Transverse Plane ◽  
Design Stage ◽  
Preliminary Design Stage ◽  
Minimization Technique ◽  
Institute Of Technology ◽  
Aided Design

A program system, INDETS, for computer-aided design of tanker structures has been developed. The system, which is the result of a joint effort of the Norwegian Institute of Technology, Trondheim, and the Aker Group, Oslo, is considered an effective tool for practical design. A design module of INDETS for tanker transverse-plane bulkheads is presented. The girder system is analyzed by a three-dimensional frame model including the surrounding structure as substructures. Two optimization methods, the Stress Ratio Technique and the Sequential Unconstrained Minimization Technique, are applied. A number of parametric variations on topology have been performed, and the depth and breadth have been varied to derive curves for estimating the weight of bulkheads at the preliminary design stage. As a conclusion, a simple-formula is presented.

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