scholarly journals PROBLEMS, DIRECTIONS, AND HORIZONS IN THE CREATION AND MODERNIZATION OF SPECIALIZED CONTINUOUSLY OPERATING EARTHMOVING MACHINES

2021 ◽  
Vol 1 (48) ◽  
pp. 223-232
Author(s):  
Musiiko V ◽  
◽  
Koval A ◽  
Lazaruk Y ◽  
◽  
...  
Keyword(s):  
Energy Intensity ◽  
Vertical Axis ◽  
Physical Models ◽  
Potential Productivity ◽  
Power Efficient ◽  
Full Size ◽  
Power Load ◽  
The Creation ◽  
Earthmoving Machines ◽  
Motion Amplitude

The article addresses directions and horizons in the creation of highly efficient specialized continuously operating earthmoving machines and provided a technical proposal for the multipurpose earthmoving machine. Study subject: continuously operating earthmoving machines. Objective: To create a power-efficient special-purpose earthmoving machine. Study method: experimental. Existing dimension-types of trenching excavators allow digging lengthy excavations of the assigned profile with minor deviations from their nominal width and depth. Creating of excavations of different profiles is being achieved via machine re-equipment with different implements. A sustainable solution is to create multipurpose earthmoving machines that are capable to perform lengthy excavations of various widths and depths with the same implement and without constructional alterations. There are known machine designs for trenching on the basis of a wheeled tractor with a mounted chain-bucket implement that is able to perform the lateral oscillatory displacements in relation to the vertical axis on the hull back of the tractor. Alteration of the implements oscilative motion amplitude allows to excavate the tranches of differnt width. This is the essence of the multipurpose earthmoving machine. The existing kinematics chain sections of the implement in relation to the tractore can't ensure the consistency of the machine load due to inconsistency of the borings along the width of excavation. This leads to significant pulsation of the load on the implement, loss of the longitudinal stability and, in the end, reduces the potential productivity of the machine by half. We have performed a set of studies in creating of the multipurpose earthmoving machines (MEM). As the experimental study objects we've used physical models of the MEM implements and full-size prototypes of the machines. Results of the study experimentally confirm the possibility to create a highly productive MEM with rotary implement, which efficiently performs trenches as well as wide construction pits in the mode of reciprocating approach of the rotary implement to excavation by means of equalization and minimization of power load parameters values. KEYWORDS: EARTHMOVING MACHINE, ENERGY INTENSITY, KINEMATICS, PRODUCTIVITY, SOIL

Nature and prospects of the EURATOM fusion programme

1987 ◽  
Vol 322 (1563) ◽  
pp. 199-211 ◽  
Keyword(s):  
International Cooperation ◽  
World Wide ◽  
Nuclear Fusion ◽  
Environmentally Friendly ◽  
Research Area ◽  
Energy Problem ◽  
Full Size ◽  
Joint Construction ◽  
The Creation

The seriousness of the energy problem and the attractiveness of providing mankind, through the use of nuclear fusion, with a potentially inexhaustible and environmentally friendly new fuel, was already obvious in the 1950s. We were aware of the formidable scientific and technological difficulties that lay ahead and that a long-term effort would have to be sustained through all possible fluctuations of an economic and political nature; this is what motivated us to establish a common European Fusion Programme more than 25 years ago. This programme designed, in conformity with reiterated Council decisions, to lead to the joint construction of prototype reactors (provided that they appeared feasible) has absorbed the fusion activities of the member countries and has even attracted two non-member countries to join. The main results obtained in the associated European Laboratories will be briefly reviewed. A full-size test of the efficiency of the programme is the creation of JET. In fulfilment of our task we are now operating JET and preparing the Next Step, NET, two strictly linked activities, with support to both from a number of associated laboratories. For the reasons listed above there is hardly another research area that is more suited than fusion for world-wide international cooperation, and in this respect the EURATOM programme is particularly attractive mainly because of JET. The suitability of such a cooperation could become even more manifest for the Next Step, which is a much more sophisticated and expensive device than JET.

Accommodating Thickness in Origami-Based Deployable Arrays1

2013 ◽  
Vol 135 (11) ◽  
Author(s):  
Shannon A. Zirbel ◽  
Robert J. Lang ◽  
Mark W. Thomson ◽  
Deborah A. Sigel ◽  
Phillip E. Walkemeyer ◽  
...  
Keyword(s):  
Mathematical Model ◽  
High Ratio ◽  
Physical Models ◽  
Solar Array ◽  
Outer Diameter ◽  
Space Applications ◽  
The Creation ◽  
The Mathematical Model

The purpose of this work is to develop approaches to accommodate thickness in origami-based deployable arrays with a high ratio of deployed-to-stowed diameter. The origami flasher model serves as a basis for demonstrating the approach. A thickness-accommodating mathematical model is developed to describe the flasher. Practical modifications are presented for the creation of physical models and two options are proposed: allowing the panels to fold along their diagonals or applying a membrane backing with specified widths at fold-lines. The mathematical model and hardware modifications are employed to create several physical models. The results are general and apply to a range of applications. An example is provided by the application that motivated the work: a deployable solar array for space applications. The model is demonstrated in hardware as a 1/20th scale prototype with a ratio of deployed-to-stowed diameter of 9.2 (or 1.25 m deployed outer diameter to 0.136 m stowed outer diameter).

scholarly journals CREATING FOREST PLANTS OF MULTI-PURPOSE RESOURCE USE BY FORESTRY METHODS

2018 ◽  
Vol 13 (4) ◽  
pp. 77-82
Author(s):  
Ирина Прока ◽  
Irina Proka ◽  
Сергей Бабынин ◽  
Sergey Babynin
Keyword(s):  
Forest Management ◽  
Forest Growth ◽  
Transport Infrastructure ◽  
Forest Plantations ◽  
Potential Productivity ◽  
The Creation ◽  
Forest Use ◽  
Rational Organization ◽  
Forest Users ◽  
Forest Plants

Based on the results of the analysis and assessment of the problem of meeting the growing needs of resource forest management in relatively densely populated areas with developed transport infrastructure, within the framework of the developed concept of ensuring the intensification of forest reproduction and use by creating forest plantations with silvicultural methods, one of the ways to solve the problem is to develop for the practical application of the target forest management systems for the creation of forest plantations of many special purpose resources, distinguished by relatively high ecological properties, potential for efficient integrated use of forest resources, which creates the possibility (due to their use) of preserving and reducing the intensity of exploitation of valuable forest ecosystems of natural and natural economic origin. To achieve this goal, based on the use of two types of technological organization of territories of different types of forests and potential productivity of cultivated plantation stands, the interrelated implementation of all activities of the forest regeneration cycle is provided. They are organically combined with a relatively intensive multi-purpose resource forest use throughout the forest reproduction cycle. In turn, effective measures for the protection and preservation of forests are ensured by integrating them into phased measures of thinning throughout all stages of forest growth, as well as by rational organization of the creation and use of forest plantations by silvicultural methods. At the same time, measures are provided for forest users to motivate the use of forest-established forest use - the creation and operation of forest plantations, taking into account the introduction of reasonable changes to the Forest Code to expand the possibilities of planted forest growing while preserving environmentally valuable forests.

Stress Analysis of Various Shaped Blade of Savonius Wind Turbine

2014 ◽  
Author(s):  
Jobaidur R. Khan ◽  
Mosfequr Rahman
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Alternative Energy ◽  
Energy Requirement ◽  
Turbine Blades ◽  
Vertical Axis ◽  
Physical Models ◽  
Vertical Axis Wind Turbine ◽  
Low Wind Speed ◽  
The World

Amidst of high demand of energy, the world is seeking alternative energy sources. Wind alone can fulfill most of the energy requirement of the world by its efficient conversion into energy. On efficiency measurement, Horizontal Axis Wind Turbines (HAWT) is the popular to the researchers, but it works best in places where the wind is not disturbed and has high wind power. The inherent advantage of facing the wind direction, design simplicity, less expensive technology for construction, lower wind start-up speeds, easier maintenance, and relatively quietness are turning the focus to Vertical Axis Wind Turbine (VAWT). The low wind speed and non-smooth wind flow regions are attracted for these machines. Savonius turbine is the simplest form of VAWT and operation is based on the difference of the drag force on its blades. The main objective of this study is to analyze a perfect mixture of new and innovative designs of Savonius turbine blades, which can make VAWT more attractive, efficient, durable and sustainable. This is studied by using blade with different numbers in operating in different wind speed. A Computational Fluid Dynamics (CFD) analysis has been used. 2D CAD models of various VAWT geometries are created and tested with CFD software ANSYS/FLUENT with a similar flow-driven motion in a wind tunnel. These simulations provided the aero-dynamic characteristics like shear stress, velocity distribution and pressure distribution. Some physical models with desired properties needed to be fabricated and tested inside tunnel to find the effect of different shapes in real.

Simulation of partial differential equations models in Java

2017 ◽  
Vol 34 (3) ◽  
pp. 800-813
Author(s):  
María José Cano ◽  
Eliseo Chacon-Vera ◽  
Francisco Esquembre
Keyword(s):  
Partial Differential Equations ◽  
Differential Equations ◽  
High Performance ◽  
Physical Models ◽  
Partial Differential ◽  
Content Type ◽  
Study Approach ◽  
The Creation ◽  
High Level ◽  
Interactive Simulations

Purpose Computer simulations improve the knowledge of physical models and are widely used in teaching and research. Key aspects are to understand their solutions and to make interactive changes to the models, observing their effects in real-time. The drawback of creating interactive simulations of physical models is the high level of programming expertise required. The purpose of this study is to facilitate this task. Design/methodology/approach Java is the perfect language for this task; it yields high-quality graphics and is widely spread in the scientific community. Because many important physical models are described by means of partial differential equations (PDEs), the combination of Java with FreeFem++, a C++ PDE solver based on the finite element method, is considered. Findings In this study, a Java library is introduced to numerically solve PDE equations via a run-time connection with FreeFem++. The solution is encapsulated into Java objects that are ready to be used in different programming tasks. The library also includes new Java visualization elements for solutions and meshes in the context of the Open Source Physics project library. Together, the connection features and the visualization elements facilitate the creation of Java simulations by programming researchers. For those with less programming capabilities, this work has been included into Easy Java Simulations, a tool to further ease the creation of interactive simulations. Originality/value The present study approach allows simulating models given PDEs. The equations are solved either in local or in remote mode (e.g. by a network accessible to a high-performance computer) and visualized locally, providing a high degree of interactivity to the end user.

The Task of Optimizing the Technical Parameters of Sowing Units

2021 ◽  
Vol 1 (42) ◽  
pp. 114-119
Author(s):  
Pavel Lavrukhin ◽  
◽  
Sofya Medved’ko ◽  
Keyword(s):  
Crop Production ◽  
Technology Development ◽  
Correct Choice ◽  
Research Purpose ◽  
Cultivated Plants ◽  
Agricultural Machinery ◽  
Potential Productivity ◽  
Technical Parameters ◽  
Economic Parameters ◽  
The Creation

The central problem of crop production remains the lag in the growth of the yield of cultivated crops from the growth of the costs of their production. (Research purpose) The research purpose is in developing a method for optimizing the technical and economic parameters of machine and tractor units for innovative technologies (in particular, sowing units). (Materials and methods) During the study authors used information methods, statistical methods of collecting information in the study of test reports of agricultural machinery and reporting the use of new equipment in various agrotechnologies. The article presents a review and analysis of foreign and domestic literature on the subject under consideration. (Results and discussion) The creation of agricultural machinery should be based on the developments of fundamental and applied agricultural sciences, the use of sowing machines is closely related to the development of technologies in which they are used. One of the most important indicators of technology development of crop production is the efficiency of operation of a sowing tractor unit and the level of potential productivity of cultivated plants. The correct choice of parameters and modes of sowing machines for the construction of the most productive plant placement schemes contributes to the efficiency of the operation of the sowing unit. One of the ways to optimize the processes of selecting parameters and modes can be implemented using the Harrington function. (Conclusions) The article shows that the task of optimizing the technical and economic parameters of the sowing units is designed to promote the creation of new machines that meet the technical, technological, agrotechnical, operational and technological, ergonomic requirements, reliability and safety requirements, and others. The solution to the problem of optimizing the technical and economic parameters of sowing aggregates is reduced to a compromise solution of two target functions for yield and cost.

Figuring Out the Interiors through the Geometric Tools of Representation

2017 ◽  
pp. 286-306
Author(s):  
Giuseppe Amoruso
Keyword(s):  
Interior Design ◽  
Continuous Process ◽  
Geometric Design ◽  
Physical Models ◽  
Descriptive Geometry ◽  
Interior Spaces ◽  
Mathematical Problems ◽  
The Creation ◽  
The Many

Interior design is taught to be an essential tool for envisioning and modeling the environments we live in. Representing interior spaces through drawings and physical models requires a continuous process of imagination. The chapter exploits the projective tools for illusory design describing the processes of representation to design and build interiors but also their perception as a space. Crucial is the role of perspective in designing and building interiors; techniques of perspective, distancing itself from the mathematical problems, become a projective tool to add illusory qualities and creating the perfect tuning among spaces that remind us that designing methods aim to add dimensions to the human sphere, not only in the physical one but also in the creation of material images and allegories. The research highlights the principles of projective-geometric design of illusory spaces. Descriptive geometry and disciplines of representation provide, in the many phases of design, scientific and artistic tools for practical resolutions of geometric and constructive problems.

Sensitivity of Seated Subjects to Low Frequency Random Vibrations in the Vertical Direction. Subjective Approach Using Vibrations Representative of Earthmoving Machines

1984 ◽  
Vol 3 (1) ◽  
pp. 18-27 ◽  
Author(s):  
P. Mistrot ◽  
D.G. Roley ◽  
P. Donati ◽  
L. Roure
Keyword(s):  
Low Frequency ◽  
Vertical Direction ◽  
Vertical Axis ◽  
Whole Body ◽  
Reference Stimulus ◽  
Random Vibrations ◽  
Body Sensation ◽  
Frequency Weighting ◽  
Iso 2631 ◽  
Earthmoving Machines

A study was conducted to compare various methods for evaluating complex vibrations. The two methods recommended by the Standard ISO 2631 were tested. A subjective equalization technique was used in which 10 seated subjects were asked to adjust the intensity of a test stimulus until they perceived a whole body sensation equivalent to a reference stimulus. The vibration stimuli were low frequency motions along the vertical axis and they were representative of earthmoving machines. They were compared to each other and to sinusoidal and third octave band random vibrations centred at the same frequencies. The results obtained indicate that the overall frequency weighting methods are the most appropriate for the evaluation of complex vibrations. The vertical weighting curve recommended by the Standard ISO 2631 produces suitable results.

scholarly journals Fabrication approaches for the creation of physical models from microscopy data

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Benjamin L. Cox ◽  
Nathan Schumacher ◽  
John Konieczny ◽  
Issac Reifschneider ◽  
Thomas R. Mackie ◽  
...  
Keyword(s):  
Physical Models ◽  
The Creation ◽  
Microscopy Data
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