scholarly journals Determination of Geometric Parameter of Cycloidal Transmission from Contact Strength Condition for Design of Heavy Loading Mechanisms

2020 ◽  
Vol 795 ◽  
pp. 012024
Author(s):  
E A Efremenkov ◽  
S K Efremenkova ◽  
I M Dyussebayev
Keyword(s):  
Geometric Parameter ◽  
Contact Strength ◽  
Strength Condition

Calculation of Speed Ratio of Two-Stage Helical Gear Reducer for Minimum Mass

2013 ◽  
Vol 274 ◽  
pp. 149-152
Author(s):  
Cheng Yi Pan
Keyword(s):  
Least Square Method ◽  
Helical Gear ◽  
Least Square ◽  
Speed Ratio ◽  
Minimum Mass ◽  
Contact Strength ◽  
Strength Condition ◽  
Total Speed ◽  
Two Stage ◽  
Optimum Speed

This paper analyses distribution of the total speed ratio of two-stage helical gear reducer. On the minimum mass and contact strength condition , the optimum speed ratio equation is derived. By means of the least square method, the fitting formula of calculating optimum speed ratio on minimum mass candition is obtained. Using this formula, the optimum speed ratio of two-stage helical gear reducer having minimum mass can be found quickly and accurately.

COMPREHENSIVE INVESTIGATION OF EXTRUSION OF П-SHAPED BRACKETS. REPORT 6. KINEMATIC AND STRESSED STATES OF BLANKET DURING RESTRICTED EXTRUSION. PART 4

2021 ◽  
pp. 51-54
Author(s):  
A. L. Vorontsov ◽  
◽  
S. M. Karpov ◽  
Keyword(s):  
Plastic Flow ◽  
Geometric Parameter ◽  
Plane Deformation ◽  
Flow Theory ◽  
Equation System ◽  
Extrusion Process ◽  
Technological Parameters ◽  
Comprehensive Investigation

On the basis of the complete equation system of the plastic flow theory, the solution of the determination problem of the kinematic and stressed states of a blanket during completely restricted extrusion of П-shaped brackets under the conditions of plane deformation in the general case of a nonaligned placement of the punch and the die is stated. The determination of the force and geometric parameter of the process was carried out. The formulae were obtained, which are required for determination of the main technological parameters of the extrusion process of П-shaped products with a relatively thin horizontal bridge.

COMPREHENSIVE INVESTIGATION OF EXTRUSION OF П-SHAPED BRACKETS. REPORT 6. KINEMATIC AND STRESSED STATES OF BLANKET DURING RESTRICTED EXTRUSION. PART 3

2021 ◽  
pp. 40-45
Author(s):  
A. L. Vorontsov ◽  
◽  
S. M. Karpov ◽  
Keyword(s):  
Plastic Flow ◽  
Geometric Parameter ◽  
Plane Deformation ◽  
Flow Theory ◽  
Equation System ◽  
Extrusion Process ◽  
Technological Parameters ◽  
Comprehensive Investigation

On the basis of the complete equation system of the plastic flow theory, the solution continuation of the determination problem of the kinematic and stressed states of a blanket during partially restricted extrusion of П-shaped brackets under the conditions of plane deformation in the general case of a nonaligned placement of the punch and the die is stated. The determination of the force and geometric parameter of the process was carried out. The formulae were obtained, which are required for identification of the main technological parameters of the extrusion process of П-shaped products with a relatively thin horizontal bridge.

Contact Strength and Cracking of Laminar Ceramics

2012 ◽  
Vol 31 (2) ◽  
Author(s):  
Lucia Hegedűsov’a ◽  
Ladislav Ceniga
Keyword(s):  
Statistical Methods ◽  
Ceramic Materials ◽  
Mechanical Tests ◽  
Bending Test ◽  
Contact Strength ◽  
Weibull Analysis ◽  
Single Cycle ◽  
Four Point Bending ◽  
Four Point Bending Test

AbstractThe paper deals with the determination of strength of laminar ceramics by mechanical tests in bending and contact modes. The bending and contact modes are simulated by the four-point bending test, and by single-cycle contact test using rollers or spheres, respectively. In general, the determination of strength of ceramic materials results from statistical methods which are usually represented by the Weibull analysis. The Weibull analysis comprises the determination of the characteristic strength

scholarly journals Modelling hydraulic mixture movement along the extraction chamber bottom in case of hydraulic washout of the tuff-stone

2020 ◽  
Vol 201 ◽  
pp. 01011 ◽  
Author(s):  
Zinovii Malanchuk ◽  
Viktor Moshynskyi ◽  
Petro Martyniuk ◽  
Sergii Stets ◽  
Daniyar Galiyev
Keyword(s):  
Process Performance ◽  
Contact Strength ◽  
Systems Of Equations ◽  
Mixture Flow ◽  
Volcanic Tuff ◽  
Hydraulic Mining ◽  
Extraction Chamber ◽  
Transportation Capacity ◽  
Chamber Bottom

This paper presents the research results of the pulp movement process along the extraction chamber bottom to the suction pipe of the pulp lifting device in case of downhole hydraulic mining the volcanic tuff-stone. The washout process and hydraulically operated transportation of the tuff-stone hydraulic mixture, when forming the extraction chamber, have been studied under various conditions and methods of exposure. As a result, the dominant parameters have been determined influencing the hydrodynamic washout technology as well as tuff-stone hydraulic mixture lifting to the alluviation map. The dependences have been substantiated of the washout process performance and transportation capacity of the hydraulic mixture flow on the determined parameters. To calculate the process of pulp flow-over along the extraction chamber bottom to the intaking hydraulic elevator headwall, the systems of equations have been determined based on the modelling the movement of tuff-stone hydraulic mixture along the extraction chamber bottom during hydraulic washout. The dependences of the contact strength of the tuff-stone samples mined by downhole method on the time spent in water are presented, resulting in determination of the tuff-stone weakening coefficient and the degree of its saturation with water.

The Angle of Pressure in the Chain-Wave Transmission and the Optimum Number of Teeth of its Sprockets

1998 ◽  
Author(s):  
Ara K. Amiryan
Keyword(s):  
Geometric Parameter ◽  
Wave Transmission ◽  
Geometrical Parameters ◽  
Optimum Number ◽  
Compression Factor ◽  
Number Of Teeth ◽  
Wave Generator ◽  
The Creation

Abstract This paper is about the chain-wave transmission (CWT), that is a new kind of harmonic drives. The objective of this work is the determination of the angle of pressure in chain-wave mechanisms and the investigation to find the constraint between the angle of pressure and geometrical parameters of the CWT. In the first part are described also objectives for the creation of the chain-wave transmission and main advantages of its construction. It is determined the angle of pressure on the basis of dynamic syntheses of the chain-wave mechanism. The compression factor of the form of the wave generator is taken as a geometric parameter, which is influence upon the angle of pressure. It is determined also that the compression factor depends on number of teeth of the interacting sprocket and on factor of multiplicity of the CWT and it is necessary to limit their values at designing of chain-wave mechanisms.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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