scholarly journals Determination of dynamic properties of the caterpillar drive of hydraulic reclamation machines and the method of articulated attachment of the working body of the trenchless pipelayer

2021 ◽  
Vol 47 (4) ◽  
pp. 122-131
Author(s):  
T. G. Gasanov ◽  
E. Z. Batmanov ◽  
M. R. Guseynov ◽  
M. N. Nazhmudinova
Keyword(s):  
Automatic System ◽  
Dynamic Properties ◽  
Experimental Studies ◽  
System Operation ◽  
Factors Affecting ◽  
Main Factors ◽  
Working Bodies ◽  
Executive Mechanism ◽  
Earthmoving Machines

Objective. The objective of the study is to determine the requirements for various devices of hydraulic reclamation machines, which are widely used in the construction of canals and drains, to maintain a given slope, as well as the calculation of the executive mechanism that serves to eliminate the oscillating movement of the working body relative to the line of the specified slope.Methods. A mathematical description of the vibrations of the working body for caterpillar hydraulic reclamation machines with mounted working bodies is given.Results. The article presents the results of research to identify the main factors affecting the oscillations of the working body of caterpillar reclamation machines. As a result of theoretical and experimental studies, it was found that when a caterpillar machine with a rigid undercarriage crosses single and multiple irregularities, the movement of the cutting edge of the rigidly mounted working body is graphically depicted by sinusoidal curves. The obtained dependencies allow conducting calculations of the automatic system of maintaining the specified slope and establish the area of stable modes of system operation. A geometric method for optimizing the hinge linkage of the working body of trenchless pipelayer is presented.Conclusion. The proposed methods of improving the performance of caterpillar hydraulic reclamation machines with mounted working bodies when moving on uneven ground surfaces can be used to create a wide class of mounted earthmoving machines, both with passive and active working bodies.

scholarly journals THE RELIABILITY OF DETERMINING THE SHORT CIRCUIT ZONE OF THE LINES OF 6–35 kV

2018 ◽  
Vol 61 (1) ◽  
pp. 5-14 ◽  
Author(s):  
F. А. Romaniuk ◽  
E. V. Buloichyk ◽  
O. A. Huryanchyk ◽  
V. S. Kachenya
Keyword(s):  
Fault Zone ◽  
Fault Location ◽  
Dynamic Properties ◽  
Short Circuit ◽  
Correction Method ◽  
Worst Case ◽  
Factors Affecting ◽  
Definition Of ◽  
Major Factors

A method of increasing the reliability of determining the zone of short-circuit at the current step protection of the lines of 6–35 kV with unilateral power, aimed at improvement of their technical perfection, is presented in the paper. Having taken the relative simpleness of the current protection into account the authors consider the unilateral remote method of accounting the parameters of the emergency mode and the type of fault to be the most suitable for the implementation of the algorithm of its functioning as compared with the existing methods of fault location. The major factors affecting the accuracy of determining the short circuit zone based on the remote method are noted. With the use of the method of computational experiment the influence of the load currents and contact resistances of various levels on the magnitude and character of changes of errors of determination of the calculated distance of the point of fault from the protection installation location taking into account the errors of measuring transformers. It is demonstrated that in many cases of arc short circuit in a loaded line in order to define the zone of short-circuit with fair accuracy correction of the estimated distance to the fault as calculated by the parameters of the damaged loop (loops) is required. According to the results of numerical experiments corrective expressions on the basis of two relative asymmetry currents determined by the current values of the differences of the phase currents of the line for detecting a type of a short circuit have been obtained. The assessment of the efficiency of the proposed method has been performed. It is shown that the application of the proposed correction method makes it possible to increase the accuracy of fault zone detection. The dynamic properties of the proposed method applied to different modes of the line functioning have been studied. It is determined that in the worst case the definition of the fault zone for a maximum duration of 26 μsec is provided.

Total cholinesterase in plasma: biological variations and reference limits.

1985 ◽  
Vol 31 (4) ◽  
pp. 546-550 ◽  
Author(s):  
L Lepage ◽  
F Schiele ◽  
R Gueguen ◽  
G Siest
Keyword(s):  
Cholinesterase Activity ◽  
Plasma Cholinesterase ◽  
Total Plasma ◽  
Factors Affecting ◽  
Plasma Cholinesterase Activity ◽  
Genetic Status ◽  
Reference Limits ◽  
Main Factors ◽  
Apparently Healthy

Abstract Factors affecting biological variation in total cholinesterase activity in plasma were studied in a population of 3372 apparently healthy subjects at least four years old. Determination of the dibucaine number, after inhibition of the activity by dibucaine, made it possible to specify the contributions of genetic and physiological characteristics to variations in the total activities by using a statistical method of segmentation. The main factors modifying plasma cholinesterase activity in males are genetic status (dibucaine number) and degree of overweight (subscapular skinfold). In females, hormonal status (puberty or menopause), genetic status (dibucaine number), and the use of oral contraceptives are the factors mainly responsible for the variations of plasma cholinesterase activity. These data allow us to propose reference limits for total plasma cholinesterase.

scholarly journals FACTORS AFFECTING THE HOUSING PREFERENCES OF HOMEBUYERS IN KUALA LUMPUR

2019 ◽  
Vol 17 (9) ◽  
Author(s):  
Puvaneswary Thanaraju ◽  
Puteri Ameera Mentaza Khan ◽  
Nur Hafizah Juhari ◽  
Sheelah Sivanathan ◽  
Nurhayati Md Khair
Keyword(s):  
Kuala Lumpur ◽  
Property Market ◽  
Cost Of Living ◽  
Housing Preferences ◽  
Factors Affecting ◽  
Market Report ◽  
Main Factors ◽  
Under Construction ◽  
The Relationship

The Malaysian Property Market Report 2016 reported that Malaysian properties transactions were down, office occupancies were down, and simultaneously unsold units were up. Almost two thirds of the total homes that developers launched remained unsold, comprising 90,491 units at the end of 2016 including of those completed, under construction, and not constructed. In recent years, the declining phenomenon in the property market is getting worse apparently. The reason behind this situation is mainly due to the rising cost of living which causes the purchasing power to be weakened; therefore, to buy a property or even goods for daily use has become difficult as the overall spending power of the Malaysians has decreased. Determining the important factors that impact upon the decision making of the house purchasing process could develop a better understanding for both buyers and home providers which eventually could avoid the ‘unsold’ properties scenario in the market. Hence, the objective of this research is to evaluate the relationship between the three main factors identified which are financial, location, and neighbourhood towards the housing preferences of homebuyers in Kuala Lumpur. A total of 100 respondents, ranged between 25 to 34 years old, responded to the survey, and the results were derived using the multiple regression analysis. The results favour the locational factors that contribute significantly to the determination of a buyer’s preferences when purchasing a house.

Study on Protective Data Flow of Intelligent Substation Based on IEC 61850

2012 ◽  
Vol 614-615 ◽  
pp. 966-970
Author(s):  
Yuan Ji ◽  
Liang Gao
Keyword(s):  
Normal State ◽  
Automatic System ◽  
Data Flow ◽  
Iec 61850 ◽  
Factors Affecting ◽  
Main Factors

This paper analyzes protective data flow in normal state and after failure with IEC 61850 D2-2 type substation. Focusing on the flow which conform to IEC 61850 Ethernet protocol by using Optimized Network Engineer Tools (OPNET) simulator, the protective data in D2-2 type substation is simulated based on IEEE 802.1Q priority-tag and VLAN technology. A sample Substation Automatic System (SAS) network is constructed, and the main factors affecting the delay of protective data is discussed in detail.

scholarly journals THE RESULTS OF THE STUDY OF THE INFLUENCE OF THE OPERATING CONDITIONS OF THE TURBOCHARGER ON ITS PERFORMANCE

2021 ◽  
pp. 70-74
Author(s):  
Aynur Galimov ◽  
Ilgiz Galiev ◽  
Bulat Ziganshin ◽  
Rail Khusainov ◽  
Al'bert Muhametshin
Keyword(s):  
Pressure Drop ◽  
Experimental Studies ◽  
The State ◽  
Operating Conditions ◽  
Lubrication System ◽  
Factors Affecting ◽  
The Matrix ◽  
Lubrication Mode ◽  
Bearing Assembly ◽  
Main Factors

The operability of the bearing assembly, which ensures the operation of the turbocharger at different speeds of its rotor, determines the reliability of the turbocharger as a whole. In this regard, the condition of the turbocharger bearing assembly determines the performance of the entire turbocharger. The purpose of the research is to justify the parameter that determines the performance of the turbocharger and a comparative assessment of changes in the state of turbochargers with a standard lubrication system and when using individual bearing assembly lubrication systems. The main factors affecting the state of the turbocharger bearing assembly, and hence the length of the rotor rotation by inertia after the engine stops, are considered to be: the increase in the clearance in the bearing assembly, the speed of rotation of the turbocharger rotor before the engine stops, and the time of pressure drop in the bearing assembly to zero after the engine stops. To obtain dependences describing the effect of the gap in the turbocharger bearing, the time of pressure drop in its lubrication system after the engine stops, and the change in the duration of rotation of the turbocharger rotor by inertia in dynamics, we conducted experimental studies. The experiment involved vehicles with a standard lubrication system and with an individual lubrication system for the turbocharger bearing assembly. The data was sample along the main diagonal of the matrix of experimental indicators. The dependences of the effect of the gap and the time of pressure drop in the bearing assembly on the duration of rotation of the rotor of the turbocharger by inertia after stopping the engine, at the speed of rotation of the rotor before stopping the engine 10000, 25000 and 40000 min-1 are obtained. A comparative analysis of this indicator is given for turbochargers with a standard and individual lubrication system of the bearing assembly, which shows that the duration of rotation of the rotor by inertia increases from 45 s (standard lubrication mode) to 90 s (with an individual lubrication system). This gives us reason to believe that the wear rate of the bearing will decrease by half during operation

scholarly journals EXPERIMENTAL STUDIES OF THE FATIGUE STRENGTH OF A500 CLASS REINFORCEMENT WITH VARIOUS TYPES OF PERIODIC PROFILE

2021 ◽  
pp. 100-107
Author(s):  
Vyacheslav TERIN ◽  
Dmitry KLIMOV ◽  
Alexander KVASNIKOV
Keyword(s):  
Experimental Data ◽  
Fatigue Strength ◽  
Experimental Studies ◽  
Deformation Characteristics ◽  
Factors Affecting ◽  
Research Results ◽  
Strength And Deformation ◽  
Main Factors ◽  
Periodic Profile

The article presents the results of studies of the fatigue strength of A500 class reinforcement by GOST 34028-2016 with various types of periodic profile. The data on the results of previously conducted experimental studies of the fatigue strength of various types of reinforcement are generalized and systematized, and the main factors affecting fatigue are established. Experimental data on strength and deformation characteristics under static and high-cycle loads of A500C class reinforcement with various types of periodic profile have been obtained. Based on the research results, proposals were made to improve the characteristics of the reinforcement and the periodic profile to increase its resistance to repeated cyclic loads and to amend the current regulatory documents. Вестник НИЦ «Строительство» • 3(30)2021 101 Ключевые слова: Арматура, периодический профиль арма- туры, предел выносливости, усталостная прочность

scholarly journals The Issues of Cryojet Technology Application for Rock Cutting

2018 ◽  
Vol 41 ◽  
pp. 03010
Author(s):  
Konstantin Golovin ◽  
Roman Kovalev ◽  
Andrey Kopylov
Keyword(s):  
High Speed ◽  
Cutting Tools ◽  
Experimental Studies ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Point Of View ◽  
Factors Affecting ◽  
Technology Application ◽  
High Cutting Speed ◽  
Main Factors

Water-jet technologies, based on the use of high-speed jets as cutting tools, are one of the promising directions of the destruction technologies for various materials. Jets’ capability to cut even very strong, anisotropic and composite materials, as well as their high cutting speed, that can be reached without workpiece reaction occurring on the tool, make them attractive from the point of view of their implementation as cutting tools. This paper outlines the methods of materials destruction by means of high-speed cryojet and discusses future areas of its application. The research reveals the main factors and criteria for evaluating the effectiveness of cryojet cutting. Experimental studies of the main factors affecting the cryojet cutting parameters were carried out using a bench unit. As a result of the experimental data analysis, we found the correspondences that can be used for calculating the cryojet cutting of various materials.

scholarly journals The tearing properties of textiles with steiner tree structure

2016 ◽  
Vol 20 (3) ◽  
pp. 823-826
Author(s):  
Ling-Ye Wu ◽  
Ping Wang ◽  
Yan Zhang ◽  
Hua Kong
Keyword(s):  
Steiner Tree ◽  
Geometrical Structure ◽  
Bulk Material ◽  
Experimental Studies ◽  
Structure Design ◽  
Tree Structure ◽  
Factors Affecting ◽  
Textile Materials ◽  
Main Factors ◽  
Geometrical Factors

Tearing properties of textiles has drawn much attention due to recent applications to bullet-proof or explosion-proof vests. However, the tearing process is very complex, which is influenced by bulk material and geometrical factors as well, and there is no a matured theory for the tearing process, which limits optimal design of the textiles. Despite many experimental studies, we still lack fully understanding of the tearing process. In this paper, tearing properties of textiles with Steiner tree structure are studied experimentally and theoretically in order to develop a reliable mathematical model. The theoretical analysis elucidates that cell size and the cell's material in a structure cell of Steiner tree are the two main factors affecting the tearing properties, which are verified experimentally. The theoretical prediction of tearing strength will be greatly benefit for geometrical structure design for textile materials in the future.

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