Determination of Critical Depth of Cutting Soil by Cutters with Building Excavators

2020 ◽  
pp. 631-640
Author(s):  
S. V. Kravets ◽  
O. P. Lukianchuk ◽  
O. V. Kosiak ◽  
O. O. Gaponov
Keyword(s):  
Critical Depth

A New Experimental Approach to Determination of Critical Depth in High Speed Machining of Soda-Lime Glass

2012 ◽  
Vol 576 ◽  
pp. 23-27
Author(s):  
M.A. Mahmud ◽  
A.K.M. Nurul Amin ◽  
M.D. Arif
Keyword(s):  
High Speed ◽  
End Milling ◽  
Soda Lime ◽  
Depth Of Cut ◽  
Soda Lime Glass ◽  
Critical Depth ◽  
Good Surface ◽  
Transition Depth ◽  
Good Surface Finish

Soda-Lime glass is a very hard and brittle material which is commonly used as window panels and many other common applications. Due to its low fracture toughness it is very difficult to machine and obtain good surface finish under nornal cutting conditions. Hence, machining has to be done in ways to avoid brittle fracture on the finished machined surface. Such machining is only possible under ductile mode machining conditions when the removal of material is performed in the plastic state. However, ductile mode machining requires that during machining the temperature generated in the cutting zone in the working temperature range of glass to avoid crack formation during machining. This makes all types of machining of glass an extremely challenging affair, given the current state and mode of mechanical machining. This research paper elucidates the results of an experimental study for determination of critical depth of cut as a function of cutting parameters in high speed end milling of soda-lime glass. The critical depth is defined as the depth of cut at which crack formation the material is initiated for a given high speed attachment. In determining the critical depth as well as the ductile brittle transition depth, machining was performed on a tapered surface. Vibration signals from an accelerometer in time domain (amplitude vs. time display) and the surface characteristics were used in identifying the critical depth of cut. The new method has been found to be useful in online determination of the critical depth, as well as the brittle-ductile transition depth, for generating crack-free surfaces with good surface finish in high speed end milling of soda lime glass.

scholarly journals Establishing the technical performance of the chain excavator with cutters working in conditions critical deep cutting of soils

2021 ◽  
pp. 78-81
Author(s):  
Alexey Goponov
Keyword(s):  
Practical Implementation ◽  
Critical Depth ◽  
Research Results ◽  
Calculated Dependence ◽  
Technical Performance ◽  
Technical Productivity

The calculated dependence for determination of technical productivity of the chain excavator with the cutters working in the conditions of critical depth cutting of soils is offered. An assessment is given for the practical implementation of the research results.

A novel and exact analytical model for determination of critical depth in trapezoidal open channels

2019 ◽  
Vol 68 ◽  
pp. 101575
Author(s):  
Seyyed Alireza Varandili ◽  
Hadi Arvanaghi ◽  
Mohammad Ali Ghorbani ◽  
Zaher Mundher Yaseen
Keyword(s):  
Analytical Model ◽  
Open Channels ◽  
Critical Depth

scholarly journals Determination of critical depth forces of cutting soils and energy consumption of chain scraper trench excavators

2021 ◽  
Vol 1 (92) ◽  
pp. 192
Author(s):  
Svyatoslav Kravets ◽  
Vladimir Suponyev ◽  
Aleksej Goponov
Keyword(s):  
Soil Mechanics ◽  
Integrated Approach ◽  
Soil Development ◽  
Practical Significance ◽  
Depth Of Cut ◽  
Critical Depth ◽  
Technical Parameters ◽  
Critical Cutting Depth ◽  
Development Processes

The presented results of scientific research are aimed at solving the problem, which is associated with an increase in the productivity of the development of trenches for laying engineering communications due to the use of new less energy-intensive soil development processes with the working equipment of chain trench excavators. The aim of the work is to establish the regularities of the interaction of the working equipment of the chain scraper excavator with the soil, in which the cutters work in the critical cutting depth mode. Among the tasks that are directed to achieve the goal, it was necessary to establish the influence of soil development processes in these conditions on the technical parameters of the machine. The methodology for solving the problem is based on the idea of the theory of soil mechanics and the provisions on the critical depth of soil cutting.Applying this knowledge to the operation of the cutters of the chain excavator for cutters guarantees the consumption of the minimum specific energy and obtaining the maximum performance of the machine. Existing studies do not give a complete picture for calculating the parameters of trench excavators in which the cutters of the working body operate in the mode of critical cutting of the soil, which in turn does not allow carrying out a comprehensive calculation of the chain trench excavator and assessing the energy efficiency of its operation. The result of the research is the obtaining of theoretical dependencies for determining the cutting forces of the soil by the working body of the excavator under the conditions of the critical depth of the work of its cutters, as well as dependencies for calculating the energy indicators of the machine. The originality of the solution to the problem lies in an integrated approach, namely, it took into account not only the influence of the work of the cutters in conditions of a critical depth of cut on the technical parameters of the machine, but also the properties of the soils that are being developed. The practical significance of the results of the research is to obtain dependencies that can be used as the basis for the engineering methodology for the integrated calculation of chain-type trench eesquators in which the cutters operate in the critical blocked and half blocked cutting mode of the soil.

scholarly journals Experimental determination of the critical depth of cutting of blocked soil cutting by cutters and the length of the ploughshare of chain excavators

2021 ◽  
pp. 43
Author(s):  
Svyatoslav Kravets ◽  
Vladimir Suponyev ◽  
Aleksei Goponov ◽  
Vitaliy Ragulin ◽  
Oleksandr Shchukin ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Power Cables ◽  
Critical Depth ◽  
Industrial Construction ◽  
Oil Pipelines ◽  
Water Mains ◽  
Excavation Work ◽  
Soil Cutting ◽  
Underground Communications

The development of civil and industrial construction and the growing trend of construction of underground communications have led to an increase in the volume of work on the laying of gas and oil pipelines, water mains, sewerage systems, power cables and communication cables. Much of the excavation work in the construction of these communications is performed by trench excavators.

scholarly journals Zone of flow separation at the upstream edge of a rectangular broad-crested weir / Oblast odtržení proudu na návodní hraně pravoúhlého přelivu se širokou korunou

2012 ◽  
Vol 60 (4) ◽  
pp. 288-298 ◽  
Author(s):  
Zbyněk Zachoval ◽  
Ivana Mistrová ◽  
Ladislav Roušar ◽  
Jan Šulc ◽  
Pavel Zubík
Keyword(s):  
Flow Separation ◽  
Water Surface ◽  
Particle Image ◽  
Pressure Head ◽  
Critical Depth ◽  
Surface Level ◽  
Image Velocimetry ◽  
Particle Image Velocimetry Method ◽  
Basic Characteristics

The paper deals with the determination of the basic characteristics of flow at the crest of a rectangular broad-crested weir and in detail with the characteristics of flow separation at the upstream edge of the weir crest. The determination of the characteristics is made on the basis of measurement of the water surface level, the pressure head and the velocity field using the Particle Image Velocimetry method. The characteristics are expressed dimensionless in relation to the energy overflow head and the critical depth.

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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