Formation of Surfaces Under Kinetic Displaying

2018 ◽  
Vol 6 (1) ◽  
pp. 20-33 ◽  
Author(s):  
Николай Сальков ◽  
Nikolay Sal'kov
Keyword(s):  
Kinetic Theory ◽  
Mechanical Engineering ◽  
Mining Industry ◽  
Rotational Movement ◽  
Complicated Problem ◽  
Space Navigation ◽  
Geometric Figures ◽  
Engineering Problems ◽  
Cyclic Surfaces ◽  
First Time

This work is the development of previously published ones in the journal "Geometry and Graphics" as follows: "Kinematic Correspondence of Rotating Spaces" (№ 1, 2013) and "Formation of Cyclic Surfaces in Kinetic Geometry" (№ 4, 2017). Many of mechanisms make rotational movement, wherein rotating parts of one mechanism "invade" into the zone of rotation for another rotating mechanism’s parts. At the same time, in addition to rotation, they can make other movements, both translational and rotational nature. The theory of kinetic geometry, of which this work is an integral part, is developed in order to avoid collisions of two or more parts of different mechanisms with each other. This is a rather complicated problem in mechanical engineering, in the mining industry, in metallurgy, and in space navigation, where there are no objects that are at rest. Therefore, the kinetic theory of matching for rotating spaces R1 3 and R23 when they are independent from each other movement is quite relevant. In this work have been considered cases for mapping of geometric figures of one space to another one when these figures are moving inside their space R13 . A theory which is presented has been called kinetic geometry, as it relates to engineering problems associated with gearings. These problems were addressed for the first time and drew-up as inventions. A monograph entitled "Introduction to Kinetic Geometry" is currently being prepared for publication.

Formation of Cyclic Surfaces in Kinetic Geometry

2017 ◽  
Vol 5 (4) ◽  
pp. 24-36 ◽  
Author(s):  
Николай Сальков ◽  
Nikolay Sal'kov
Keyword(s):  
Machine Tool ◽  
General Position ◽  
Space Curve ◽  
Rotational Movement ◽  
Space Navigation ◽  
Straight Line ◽  
Cyclic Surfaces ◽  
Made In

This paper is an evolution of the "Kinematic Compliance of Rotating Spaces" paper, previously published in the "Geometry and Graphics" journal №1, 2013. A great many of mechanisms are making rotational movement, wherein rotating parts of one mechanism are "invading" into a rotation zone belonging to parts of another rotating mechanism. The challenge is to prevent the collision of rotating parts belonging to two or more details with each other. This problem is particularly sensitive for machine engineering. In space navigation, where, in principle, there are no objects that are at rest, the problem of satellites collision with astronomical bodies rotating around their axes is also the urgent one. Therefore, the theory of kinematic matching for rotating spaces R31 and R32 when they are moving independently from each other is urgent too. Each of two considered spaces may have a uniform or non-uniform movement in a given direction, a curved movement or a rotational movement around the axis specified for each space. In this paper has been considered the formation of cyclic surfaces obtained by rotation of one space relative to another one and different orientations of the generating line relative to the axes. Has been considered one of the options for rotating spaces, when their axes are parallel. In such a case the generating line is located in the following positions: it is straight and parallel to the axis; it is straight and intersects the axis; the rectilinear generator is in a plane that is parallel to the plane of the axes; the generating line is a straight line of general position; the generating line is a space curve. Has been demonstrated application of the rotating spaces theory in mining, chemical and machine tool industries, made in the form of inventions, confirmed by copyright certificates of the USSR.

Analysis of professional incidence of workers of the mining industry of the Orenburg region

2020 ◽  
pp. 650-650
Author(s):  
B. L. Kolesnikov ◽  
E. M. Egorova ◽  
O. S. Redina
Keyword(s):  
Occupational Diseases ◽  
Mining Industry ◽  
Orenburg Region ◽  
Clinical Hospital ◽  
Regional Center ◽  
Mining Enterprise ◽  
First Time

The analysis for the first time of the established occupational diseases to employees of the mining enterprise of the Orenburg region in the regional center of professional pathology of Orenburg Regional Clinical Hospital during 2016-2018 is carried out.

PREVENTION ISSUES OF OCCUPATIONAL AND PRODUCTION-RELATED DISEASES IN MINING INDUSTRY WORKERS

2021 ◽  
Author(s):  
G.S. Agzamova ◽  
◽  
N.U. Ibragimova ◽  
Yu.A. Abdieva ◽  
Keyword(s):  
Health Care ◽  
Metallurgical Plant ◽  
Occupational Diseases ◽  
Mining Industry ◽  
Production Environment ◽  
Cardiovascular Pathology ◽  
Dynamic Observation ◽  
High Level ◽  
Medical Examinations ◽  
First Time

Abstract: Protecting and promoting the health of workers in the mining industry is one of the most important problems of occupational pathology and health care. The structure and levels of prevention of occupational diseases are directly dependent on harmful and adverse factors of the production environment and labor process, adequately reflecting the state of production. Purpose: to study the issues of prevention of occupational and production-related diseases of mining and metallurgical plant workers. Research materials and methods: a dynamic observation of the health status of workers in the main industries of the mining and metallurgical plant (800 workers) was carried out. 92 patients with silicosis were examined. Results: Up to 92.8% of first-time occupational diseases are detected during periodic medical examinations. The prevailing sociomatic pathology is cardiovascular pathology, namely, arterial hypertension and diseases of the musculoskeletal system, mainly osteochondrosis of the spine. Prevalence of silicosis was observed in individuals with little professional experience (from 5 years old), young age and primary detection of patients in stage II silicosis, which was accompanied by respiratory failure. Conclusions: The prevention programme developed will ensure a high level of health care in terms of early diagnosis, rehabilitation and secondary prevention of both occupational and occupational diseases.

Innovations Based on PCC

2013 ◽  
Vol 687 ◽  
pp. 369-377 ◽  
Author(s):  
Andrea Dimmig-Osburg
Keyword(s):  
Mechanical Engineering ◽  
Field Tests ◽  
Innovative Development ◽  
Self Compacting Concrete ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Innovation Potential ◽  
Acrylic Ester ◽  
Bridge Building ◽  
First Time

Abstract. In this paper, three examples for the application of PCC are presented, which exceed the well established use as restoration material and show the great innovation potential of these materials. The first example shows an innovative development of a polymer-modified self-compacting concrete (SPCC) for the restoration of vertical facing concrete surfaces. In the second example PCC was for the first time applied as construction concrete to a bridge building. The last instance describes the potential of the SPCC for special applications in mechanical engineering. A styrene acrylic ester dispersion and different sorts of cement were used. The polymer/cement-ratio varied from 0.05 to 0.10. The water/cement-ratio depended on the requirements of the different PCC. The essential laboratory and field tests as well as the results are described.

Identification of Modal Parameters of an Elastic Rotor With Oil Film Bearings

1984 ◽  
Vol 106 (1) ◽  
pp. 107-112 ◽  
Author(s):  
Rainer Nordmann
Keyword(s):  
Modal Analysis ◽  
Dynamic Behavior ◽  
Design Process ◽  
Mechanical Engineering ◽  
Mechanical Systems ◽  
Rotating Machinery ◽  
Modal Parameters ◽  
Powerful Method ◽  
Oil Film ◽  
Engineering Problems

Investigations of the dynamic behavior of structures have become increasingly important in the design process of mechanical systems. To have a better understanding of the dynamic behavior of a structure, the knowledge of the modal parameters is very important. The powerful method of experimental modal analysis has been used to measure modal parameters in many mechanical engineering problems. But the method was mainly applied to nonrotating structures. This presentation shows improvements of the classical modal analysis for a successful application in rotating machinery with nonconservative effects. An example is given, investigating the modal parameters of an elastic rotor with oil film bearings.

Correlation between the mineral composition and strength properties of sulfate rocks

2021 ◽  
pp. qjegh2020-173
Author(s):  
Mohammad Reza Rahimi ◽  
Seyed Davoud Mohammadi ◽  
Alireza Taleb Beydokhti
Keyword(s):  
Mineral Composition ◽  
Failure Mode ◽  
Strength Properties ◽  
Shear Mode ◽  
Rock Cores ◽  
Strength Tests ◽  
Engineering Problems ◽  
Gypsum Rock ◽  
Under Construction ◽  
First Time

The literature review confirms that the effect of mineral composition on the strength properties of rocks has rarely been studied. One of the most problematic sedimentary rocks is sulfate rocks, which cause engineering problems in the infrastructure sites such as reservoir dams. In this paper, for the first time, the effect of mineral composition on the strength properties of sulfate rocks was investigated. The rock blocks were collected from the Gachsaran Formation outcrops at the four under construction reservoir dam sits in Iran. After preparing, drying and saturation the rock cores samples (329 samples), uniaxial compressive strength tests were performed in accordance with ASTM and ISRM standards. The results of this study confirmed that firstly, there is a correlation between the mineral composition and the strength properties of the sulfate rocks, but the obtained relationships do not have the necessary certainty to be used as predictive equations. Secondly, by increasing the amount of anhydrite or microcrystalline carbonates in a gypsum rock, its strength properties are increased. Thirdly, in a dry condition the dominant failure mode in gypsum and anhydrite rocks is a shear and dilatation mode, respectively, but after saturation, the failure mode tends to shear mode.

scholarly journals Relaxation methods applied to engineering problems. XI. Problems governed by the ‘quasi-plane-potential equation'

1945 ◽  
Vol 183 (994) ◽  
pp. 258-283 ◽  
Keyword(s):  
Finite Difference ◽  
Poisson Equation ◽  
String Tension ◽  
Finite Difference Approximation ◽  
Difference Approximation ◽  
Transverse Displacement ◽  
Relaxation Methods ◽  
Potential Equation ◽  
Engineering Problems ◽  
First Time

The ‘quasi-plane-potential equation’ ∂/∂x (X∂ψ/∂x) + ∂/∂y (x∂ψ/∂y) +Z = 0 is discussed in relation to problems where Z and x are known functions of x and y . It governs ( inter alia ) the small transverse displacement of a membrane in which the tension T ∝X, and its finite-difference approximation governs the small transverse displacements of nodal points of a net in which, similarly, the string tension T varies from node to node. (Equilibrium in the directions of x and y can be maintained, both in the membrane and in the net, by forces acting in those directions and accordingly having no effect on the transverse equilibrium.) The relaxational treatment, based on this mechanical (net) analogue, reduces when X is constant to the treatment developed, in earlier papers of this series, for problems governed by the ‘plane-harmonic’ (Poisson) equation, ∂ 2 ψ/∂x 2 + ∂ 2 ψ/∂ y 2 + Z = 0 Thus an opportunity is afforded for a review of various improvements which have been incorporated in the technique first propounded in Part III. In particular, this paper for the first time uses systematically the device of ‘graded nets’, i.e. nets of which the mesh-side a is smaller in some parts than in others.

Mechanical Engineering Aspects of Naval Mining

1949 ◽  
Vol 160 (1) ◽  
pp. 22-32
Author(s):  
E. C. Wadlow
Keyword(s):  
Scientific Knowledge ◽  
Mechanical Engineering ◽  
Safety Requirements ◽  
Contact Type ◽  
Engineering Problems ◽  
The Subject ◽  
Considerable Complexity

The paper outlines some of the engineering problems which arise in connexion with naval mining, and describes some of the weapons and devices used by Britain and Germany in the war of 1939–45. Although naval mining has a long history, its development is necessarily conducted under conditions of secrecy, and publication of information concerning it is possible only after a major war in which there has been a general disclosure of methods and materials employed by both sides. The popular conception of a mine is a spherical buoyant object which will explode if hit by a ship. The buoyant contact type is, however, only one of many forms now available. A number of these are illustrated here, and the variety may surprise those not familiar with the subject. Methods of laying, general principles of operation, and safety requirements are described, and the mechanical details of design of mineshells, fittings, components for control and firing circuits, and other features are mentioned. Naval mines have reached a state of considerable complexity and many fields of scientific knowledge are now called upon in making them effective weapons.

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