bluuebunny/crossref_metadata_2025 huggingface dataset:
Integrated approach methodology for evaluating the feed rate of mechanical disk hopper-feeding devices
Authors: Pantyukhina E V
Published: May 2020

The paper considers the methodology of the proposed integrated approach to mathematical modeling of the actual feed rate of various designs of mechanical disk pocket hopper-feeding devices. The approach allows us to estimate the actual feed rate of the device for various types of axisymmetric parts of the shape of rotation bodies with sufficient accuracy for practice at the design stage. The mathematical model of feed rate takes into account the probability of gripping axisymmetric parts of the shape of rotation bodies with different geometric parameters, as well as the design and kinematic parameters of feeding devices.
Algorithm synthesis for tertiary information processing of distance measuring channel in information and measurement system of air traffic control
Authors: Pudovkin A P , Panasyuk Yu N , Varepo L G , Sustin A I , Danilov S N , Trapeznikova O V
Published: May 2020

The issue of improving the efficiency of the information and measurement system of automated air traffic control systems on the example of the distance measuring channel algorithm synthesis for following up the aircraft is considered. The choice of state and observation models is justified, computer simulation is performed, and the results of the studied algorithm are obtained.
The automating of the quantitative analysis and characterization of the polymer based films surfaces SEM-images
Authors: Rytikov G O , Doronin F A , Nagornova I V , Varepo L G , Rudyak Yu V , Nazarov V G
Published: May 2020

It is represented a possible way to standardize and to automate the quantitative description and the analysis of the formed by the scanning electron microscope polymer based films surfaces’ images. Also there are the calculating algorithms for the topographic model forming and the degrees of planar and contour digital heterogeneities calculating and the analysis process model with the computer application interface and the corresponded results of the sulfonated and fluorinated low-density polyethylene films SEM-images’ characterization. Due to the universality of the proposed techniques for quantitative image description and simulating they can be used in quality control systems under the design and manufacture of the surface-modified polymer films.
Technical diagnostics of gear hobbing technological system on diagnostic signs of deviations of tooth profile of gears
Authors: Safarov D T , Kondrashov A G
Published: May 2020

The article reveals the main provisions of technical diagnostics of gear hobbing machine system with CNC on the diagnostic parameters of the profile of the sides of the teeth. The scheme of embedding diagnostic processes in the cycle of improving the quality of manufacture of gears. The developed scheme is universal and applicable to any gear processing operations. It consists of several successive steps – the evaluation of indicators relative to the limit values, the identification of the technological structure of the profile errors and the identification and analysis of diagnostic deviations of the profile of the lateral surface of the teeth, indicating. Each step of the improvement cycle is necessary to determine the negative factors of the process leading to a deterioration in the quality of manufacture of gears. Application of technical diagnostics profile diagnostic indicators allows to detect deviations of the technical condition of machine components, adjustment or tuning machinery. Diagnostic indicators are identified for the most significant technological components of non-conforming errors of the profile of the sides of the teeth of the gear wheel. The advantage of this quality improvement scheme is that it is more efficient than traditional methods of statistical quality management.
Intelligent information-measuring system for operational control of thermo-physical properties of heat insulating materials
Authors: Selivanova Z M , Kurenkov D S , Trapeznikova O V , Nagornova I V
Published: May 2020

The quality of materials is evaluated by non-destructive testing of their thermo-physical properties in the manufacturing process. A relevant aspect in determining the quality of products at the manufacturers is the development and application of an intelligent information and measurement system for operational control in the quality properties of heat insulating materials. The objective of the study is to improve the efficiency and accuracy of determining the thermo-physical properties of the test materials by solving the problem of reconfiguring the system structure in accordance with the specified algorithm of operation, making decisions on the choice of a method for non-destructive testing of thermo-physical properties of materials, and an approach to building the structure of an intelligent measuring system. The solution for the problem of system architecture configuration with artificial intelligence methods according to information and measurement situations in the operation of the system is proposed. Intelligent decision-making procedures are presented when choosing a method for controlling the thermo-physical properties of materials as a result of identifying the measuring situation. An approach to the construction of the intellectual information-measuring system structure for operational control of material quality properties based on the selection of system structure and control method for thermo-physical properties of materials adaptive to the class of test materials by thermal conductivity to improve the efficiency and accuracy of thermal measurements is created. The results of experiments to determine the thermo-physical properties of heat insulating materials using an intelligent information and measurement system are presented. The analysis of the obtained results confirms the control accuracy increase in the thermal properties of materials.
Acousto-optic method of electronic laser phase control for laser interferometry
Authors: Teleshevsky V I , Bushuev S V , Grishin S G
Published: May 2020

The paper describes a method of electronic control of laser phase for laser interferometry. The method utilizes acousto-optic interaction and ultrasonic wave diffraction. The article presents an opto-electronical scheme for phase shift control with high resolution in reference and object beam without using high voltage.
Generation of the surfaces via quasi-rotation of higher order
Authors: Beglov I A
Published: May 2020

In this study we report a change in the geometry of space during its quasi-rotation relative to an ellipse. Symmetric interrelation, generated by the quasi-rotation around the elliptic axis is considered. The possibility of an arbitrary point quasi-rotation in the R
3 space around the elliptic axis is confirmed and discussed. Further, we analyze the properties of quasi-rotation surfaces. In the considered examples, a circle within the quasi-rotation axis’s plane is adopted as a generatrix. The algorithm used to build 3D graphs is based on a mathematical description of the method of rotation of a point around a second-order axis curve. A symmetry interrelation with respect to the elliptic axis is considered. The generated images are analyzed to determine the structure of their self-intersection and self-touching. Flat intersections of the surfaces under study are generated. Geometric methods were used to determine the order of the surfaces. It was established that in the considered example that quasi-rotation of the circle that belongs to the quasi-rotational elliptic axis’ plane, a surface of the twentieth order is formed.
N-n-digit interrelations between the sets within the R
2 plane generated by quasi-rotation of R
3 space
Authors: Beglov I A
Published: May 2020

The background of description of the method for geometric objects rotation around the curved axes in the form of curves of the second order is being considered. The above-described method got the name of “quasi-rotation”. The algorithm of geometric construction of the two-two-digit interrelation on the basis of the circular axis of symmetry is provided. The described interrelation is analogous to the mirror symmetry regarding a straight linear axis. The method is suitable for construction of some well-known algebraic curves. The analogies between rotation and quasi-rotation are determined and described. The formula of the same plane preimage-to-image interrelation, generated by the quasi-rotation around the curved axis of the second-order curve is provided. The presented formula allows to derive the equations that effectively describe images of the given sets. The method for geometric construction of the images of geometrical objects lying within the plane of the second-order curve at their quasi-rotation for a given angle regarding the curve is described. The obtained results describe geometrical basics for the quasi-rotation. They serve as the basis for shape-forming of algebraic surfaces of high orders, and can be utilized as the theoretical basis for the computer-aided automated geometric projection.
Application of mixed geometric interpolants for modeling the strength characteristics of steel fiber concrete
Authors: Konopatskiy E V , Bezditnyi A A
Published: May 2020

The paper proposes an approach to modeling geometric multifactorial processes and phenomena using mixed geometrical interpolants, for example of the steel fiber concrete strength characteristics’ simulation A key role is played by the formation of the geometric model, as developed in detail in the article. Analytical description of the geometric model obtained by means of algebraic curves (that pass through the predetermined point in advance) is realized by means of the BN-calculus mathematical formalism.
Determination of catacaustics through cyclographic mapping
Authors: Lyubchinov E V
Published: May 2020

The paper presents a general algorithm of determination of catacaustics given a curvilinear source and a reflector. The algorithm is based on the method of cyclographic mapping as well as the optical property of a cyclographic projection of a spatial curve. The algorithm is consistent and universal; it is suitable for every problem where the light source is given in the form of a central, parallel or diffuse bundle of rays. Through the presented algorithm the analytic solution to the problem of determination of catacaustics is acquired. The results of the study can be utilized in applied geometric optics in design of optical systems consisting of the triad of elements: a light source, a reflector and a receiver.
Forming of contour-parallel lines family with the detection of their non-working sections
Authors: Myasoedova T M , Panchuk K L
Published: May 2020

The paper considers family of working contour-parallel lines formation used in the design of the toolpath that processes pocket surfaces. Contour-parallel working lines are the ones from which the lines-noises, i.e. non-working sections, are removed. Non-working sections include self-intersection loops and intersections of oncoming fronts in the case of multiply-connected domains. The spatial geometric model of forming contour-parallel lines is based on the cyclographic mapping. As a tool for detecting non-working sections for the case of oncoming fronts, the method of a testing ray is proposed. In case of self-intersections of contour-parallel lines, non-working sections are cut off by the parameter of these lines at the points of self-intersection. At the output of the proposed shaping algorithm of the working contour-parallel lines family, the parametric equations of these lines are formed. The algorithm successfully works for multiply-connected domains with polygonal and curved contours of the boundaries of the domain and islands in it. A comparative evaluation of the proposed method of forming a contour-parallel lines family with trimming non-working sections and the known methods that use the distance function is performed.
Geometric modeling of sheet transfer process from grippers to grippers
Authors: Serkova L B , Varepo L G , Panichkin A V , Kolozova O A , Glukhov V I , Belyaev P S
Published: May 2020

One of the important processes in operation of a printing machine is the transfer of a sheet of printed material from one cylinder to another. The transfer of the sheet is carried out using special grippers attached to the printing cylinder, and quality of printing depends on their accuracy. At the stage of printing process preparation, an important step in setting up the equipment is the correct installation of the grippers. The paper presents the results of developing a geometric model of the sheet transfer process from grippers to grippers. This process is visualized using a computer simulation. The presented model makes it possible to define the trajectory of the paper movement in the transfer zone, and track the untimely opening or closing of grippers. This may lead to printing process abnormality.
Automatized determination of types and characteristics of the optical fibers state located in the laid cables
Authors: Bogachkov I V
Published: May 2020

The classification of the optical fiber types and influencing factors by using the Brillouin reflectograms are considered. The programs for automated data processing of Brillouin reflectograms are presented. The types of the optical fibers are determined by the characteristics of the frequency profile of the Mandelstam – Brillouin scattering spectrum. Based on the analysis of Brillouin multi-reflectograms, we can detect the factors that effect on the characteristics of the back-reflected Mandelstam – Brillouin scattering signal in the tested segments of the optical fibers.
The polarization effect in electro-magneto-elastic semi-bounded heterostructures
Authors: Levi M O
Published: May 2020

In this paper, we consider the effect of the polarization effect of electro-elastic and magneto-elastic parts of an electro-magneto-elastic heterostructure on its dynamic characteristics. As the studied heterostructure, a packet of layers lying on half-space was selected. It is assumed that the layers are mechanically rigidly adhered to each other. The electrical and magnetic conditions at the layer boundary can be either completely open or completely shorted. Given the variable boundary conditions, the Green’s function of the heterostructure was constructed and the phase velocities were obtained. The electromechanical coupling coefficient in the heterostructure is obtained for various geometric proportions of its constituent layers.
Volumetric Flow Observer For A Pumping Unit Without Backpressure With Induction Electric Drive
Authors: Lysenko O A , Simakov A V
Published: May 2020

The article describes the construction of a volumetric fluid supply observer in pumping systems. The electric drive of the pump unit uses an induction motor with a squirrel-cage rotor. The rotation speed of the electric motor is adjustable. A centrifugal pump is used to pressurize a pipeline. Requirements for the automation level of pumping units are growing, so the research topic is relevant. When constructing the observer, the double squirrel cage induction motor model in a fixed coordinate system is used. The impeller rotation speed and the pump resistance moment were estimated based on the Luenberger observer. The observer is used to identify the volume flow. It is based on a centrifugal pump model using approximating coefficients of a Second-Degree Polynomial function. The article provides the dynamic characteristics of the reference model and observer. As a studies result, an error in the steady state operating mode of 1% was determined.
Wear resistance of steel obtained by surfacing a flux-cored wire 30N8Kh6M3STYu
Authors: Eremin E N , Losev A S , Ponomarev I A , Borodikhin S A , Volochayev M N
Published: May 2020

The wear resistance of steel 30N8Kh6M3STYu as a result of surfacing by flux-cored wire was investigated. It was found that the average value of the relative mass wear of such a metal is 0.0002818 g/m, and the average value of the linear wear is 0.0006194 mm/m. The average value of the coefficient of friction after running in increased from 0.192 to 0.211, and the average value for the test was 0.207. The microhardness of the matrix of such a metal as a result of aging is in the range of 639–683 HV, the microhardness of the eutectic is 650–786 HV and the hardening phase is in the range of 783–882 HV. It has been shown that the steel hardening mechanism of such a system is determined by the compounds of carbides, for the most part, TiMo0.707C0.5, Cr3C2, and a small amount of TiC, SiC, intermetallic compounds, mostly Cr0.92Mo3.08, Fe0.875Mo0.125, Fe2Ti, and a small amount of Mo0984Ni0.016, Ti3Al, Ni3Ti, and Fe24N10 nitride formed as a result of aging. The established complex of dispersed phases precipitated after aging determines the wear resistance of such steel. The flux-cored wire created on the basis of 30N8Kh6M3STYu steel can be used for surfacing parts working under friction of metal on metal.
Complex study of structural state and properties of ion-plasma functional coatings
Authors: Orlov P V , Korotaev D N , Povoroznyuk S N , Poleschenko K N
Published: May 2020

Based on the justified methodological complex the study of the multilevel structural state of coatings and surface layers created by the ion-plasma modification was made. A comparative quantitative assessment of structural changes and the chemical composition of coatings by SEM, XPS, EDX methods and the physical and mechanical properties of coatings based on titanium nitride was carried out. It was found that for all variants of coating formation there is no titanium in the metallic state and, therefore, the formation of a droplet phase does not occur. Layer-by-layer XPS analysis has determined that coatings are heterogeneous in its composition in depth. It is shown that the modification of steel surfaces with a TiN-based composition can be used to form wear-resistant coatings on the working bodies of road milling machines that are actively used in the overhaul and maintenance of the highways.
Influence of low temperature on structure and impact strength of structural steels welded joints
Authors: Saraev Yu N , Golikov N I , Maksimova E M , Sidorov M M
Published: May 2020

The article is devoted to the study of the relationship between climatic conditions of construction, installation and repair during the operation of industrial technical systems and the structure and properties of welded joints of structural steels. It has been established that the main technological factor affecting the crystallization of the weld metal from the melt is the heat input transmitted by the heating source - an electric arc, during welding at all intervals of the formation of one-piece joints. The research results made it possible to justify the conditions under which the formation of one-piece compounds occurs. The frequency ranges of controlled heat input, that maintain a specified set of welded joints mechanical properties are determined.
Review of electric thrusters with low consumption power for corrective propulsion system of small space vehicles
Authors: Vavilov I S , Fedynin V V , Yachmenev P S , Zharikov K I , Lukyanchik A I , Stepen P V
Published: May 2020

This paper presents an overview of current world developments in the field of low-energy plasma propulsion systems for small micro - and nanoclass spacecraft. A promising direction of thrusters for devices of nanoclass are propulsion ion propulsion. The use of electrical energy and high-frequency electromagnetic radiation eliminates the problem of significant power losses, because at this level, the laws of optics (reflection and focusing of waves by metal surfaces and dielectrics) and electrical conductivity (energy transfer through metal conductors) work. This fact is an advantage of plasma installations over thermal ones.
Investigation of the characteristics of an ion engine with a microwave generator plasma
Authors: Vavilov I S , Yachmenev P S , Fedyanin V V , Stepen P V , Lukyanchik A I , Zharikov K I
Published: May 2020

This paper presents the results of an experimental study of the velocity of ionized nitrogen flowing from the working chamber of an experimental sample of the primary accelerating system of the ion engine into the vacuum space. The main method of research was chosen calorimetric method. The design of a small spacecraft jet propulsion system with ionized gas acceleration in the high-frequency gap of a microwave generator is proposed. The object of the study is a prototype of the primary ion engine accelerator system with a solid-state microwave plasma generator and an accelerating gap. The study showed that a 3-watt microwave generator together with a pulsed voltage source of an accelerating potential difference of 1 W at a nitrogen consumption of 2.5 mg/s creates an ion jet whose speed reaches 30 km/s.the Current of the ion jet was 2-2.5 mkA. The field strength of the accelerating potential difference was 4450 V / m.
The effect of stabilizers on the properties of porous rubbers
Authors: Zhansakova K S , Russkikh G S , Eremin E N
Published: May 2020

This work is devoted to identifying the patterns of influence of the Lubstab series stabilizers manufactured by LLC NPF Khiminvest on the technological, physicomechanical and thermophysical properties of porous rubbers based on styrene-butadiene rubber with the addition of azodicarbonamide as a porophore. It was found that the addition of the Lubstab 05 stabilizer allowed us to obtain vulcanizates with higher porosity as compared to other samples. A 7% decrease in apparent density as compared to the standard was achieved.
The influence of filler dispersity on radio-absorbing properties of material based on synthetic rubber
Authors: Eremin E N , Kukushina K G , Filatova T N
Published: May 2020

The article considers the features of changes in the radio-absorbing properties of an elastic absorber with a change in the dispersion of a functional filler. The technology of preparing the absorber and filling the covers of amplifiers in the microwave range is described. The results of the analysis of carbonyl iron powders by the methods of X-ray phase analysis, laser diffraction, scanning electron microscopy are presented.

It has been shown that a decrease in the particle size of carbonyl iron by mechanical activation helps to reduce the frequency unevenness.
Application of Elliptic Equations for the Study of Asymptotic Distributions of Temperature and Moisture Content During Drying by Electromagnetic Radiation
Authors: Afanas’ev Anatoliy , Bakhracheva Yulia
Published: May 2020

A new approach is proposed to study the processes of heat and moisture propagation during drying by electromagnetic radiation. It consists in the fact that transient processes preceding the constant drying speed mode are excluded from the calculations. Thus, the initial boundary value problem for two related parabolic equations can be replaced by two independently solved boundary value problems for elliptic equations. On this basis, a numerical algorithm was developed to study the temperature and moisture content fields when drying samples of arbitrary shape. It can be used in all cases where transients are not of interest.
Chaotic signal masking based on orthogonal polynoms
Authors: Belim S V , Yu Belim S
Published: May 2020

The article discusses the approach to encoding information based on families of orthogonal polynoms. The discrete signal is represented as a superposition of orthogonal polynoms. This approach allows to be transmit the useful signal in a chaotic container without matching the parameters of the noise generators. Different orthogonal functions families are considered: trigonometric functions and, Lagrange polynomials. The parameters of orthogonal polynoms families have been studied to increase the stability and stealth of the signal. The computer experiment is made. The average number of decoding errors is calculated depending on the numerical integration step. Orthogonal polynomials require significantly larger calculations to decode the message.
Mechanisms for optimization of detection and correction of text errors based on combining multilevel morphological analysis with n-gram models
Authors: Jumanov I I , Karshiev Kh B
Published: May 2020

In the article the problem of increasing the information reliability in electronic document management systems is formulated, and mechanisms for controlling and correcting spelling and errors with semantic values are developed on the basis of a combined multilevel morphological analysis with n-gram models, a typical search, recognition, and classification tools. Mechanisms for verifying the spelling of a word on the basis of a vector representation of variables and comparison with a standard analogue are proposed according to the principles of using statistical, natural, structural, technological, semantic information redundancy. The solutions to the problems of increasing the information reliability based on a set of keywords, phrases, terms by comparing with virtual, frequency dictionaries located in the electronic document database and knowledge base are obtained. A technique has been developed to optimize control mechanisms and correct spelling errors based on the use of logical, semantic and structural - technological links, cross-relationships between individual or groups of words, phrases in the text information. The obtained tools to increase the reliability of the texts of electronic documents are tested in real condition, the results are compared with the conclusions of the system experts.
The Pareto set reduction in bicriteria customer order scheduling on a single machine with setup times
Authors: Kovalenko Yulia V. , Zakharov Aleksey O.
Published: May 2020

A bicriteria customer order scheduling problem is investigated in the context of the axiomatic approach of the Pareto set reduction proposed by V. Noghin. We construct families of the instances with various structures of the Pareto set and theoretically analyze the Pareto set reduction.
About the probability of the occurrence of binary palindromes in the computer data
Authors: Lyubimov V V
Published: May 2020

The aim of this work is to obtain expressions to calculate the probability of the occurrence of binary palindromes in a finite equally probable combination of zeros and ones. The classical definition of probability is applied in the calculation of the probability of the occurrence of binary palindromes. The key results of the study are presented in the form of two theorems. Furthermore, the consequences of these theorems and characteristic examples of calculation of the probability of the occurrence of the palindromes are considered. All formulated statements are supported by proofs. The main results of the work can be used when analyzing computer data stored in a binary code.
Transitive digraph groups
Authors: Noskov Gennady A.
Published: May 2020

In the present paper the class of digraph groups is introduced by analogy with the prominent class of “graph groups”. Digraph groups implicitly present in the previous work by the author on the automorphism groups of graph groups. The structure of transitive digraph groups is described in terms of the Levi decomposition into the semidirect product of the Steinberg groups and the nilpotent radical.
On weakly equational Noetherian direct powers of groups and semigroups
Authors: Shevlyakov A N
Published: May 2020

We study Diophantine equations over direct powers of groups and semigroups and prove that any direct power of a finite semigroup (group) with zero (resp. with the equational domain property) is weakly equationally Noetherian.
Optimization of nodes of Newton-Cotes formulas in the presence of an exponential boundary layer
Authors: Zadorin A I
Published: May 2020

The problem of numerical integration of a function of one variable with large gradients in the region of the exponential boundary layer it is studied. The problem is that the use of composite Newton-Cotes formulas on a uniform grid leads to significant errors when decreasing the small parameter ε, regardless of the number of nodes of the basic quadrature formula. In the paper it is proposed to choose nodes based on minimizing the error of the composite Newton-Cotes formula. It is proved that the minimum error is achieved on the Bakhvalov mesh, while the error of the quadrature formula becomes uniform in the small parameter ε.
Influence of scandium concentration on parameters of piezoelectric transducer based on aluminum scandium nitride
Authors: Kozlov A G , Torgash T N
Published: May 2020

An analytical approach is presented that allows one to determine the influence of the scandium concentration on the input electrical impedance of piezoelectric transducer based on aluminum scandium nitride. The scandium concentration dependences of the properties aluminum scandium nitride affecting on the transducer impedance were determined by means of the approximation of the dependences obtained from their experimental values for various Sc concentration. Based on the frequency dependences of the impedance the influence of Sc concentration in Al1-xScxN piezoelectric layer on the frequencies of the serious and parallel resonance of the unloaded and loaded transducer has been established.
Determination of optimum deposition conditions amorphous silicon thin films
Authors: Strunin V I , Khudaibergenov G Zh
Published: May 2020

The aim of the study is to increase the efficiency of solar cell elements on the basis of thin films of amorphous-nanocrystalline silicon, by incorporating silicon nanocrystals (Si-NPs) into a film of hydrogenated amorphous silicon (a-Si:H). The purpose of the operation is to work out optimum deposition modes of amorphous silicon films. An obstacle here is the occurrence of dust particles affecting the properties of the resulting films. As well as increasing the overall efficiency of photocells due to the creation of single-crystal quantum dots (nanocristalites), which will play the role of centers of flow of parasitic currents. The obtained samples were studied using physical methods of analysis (Raman light scattering, study of the band gap).
Thermal decay rates for an asymmetric cusped barrier at strong friction
Authors: Zakharov A V , Chushnyakova M V , Gontchar I I
Published: May 2020

The thermal decay of a metastable state over an asymmetric cusped barrier in the regime of overdamping (strong friction) is considered. This seems to be of importance for the nanoscale experiments on pulling polymeric molecules. The decay process is simulated numerically through computer solving of the Langevin equation. The quasistationary rates RD
, as well as the mean lifetimes and transient times, are extracted from the numerical time-dependent rates Rn
(t). The impact of the backscattering on the value of RD
is discussed. The approximate analytical decay rate is derived for the asymmetric cusped barrier. The numerical results are confronted with this formula and with another analytical formula (the integral Kramers rate) available in the literature.
Improving energy performance of hydraulic torque converters
Authors: Antsev V Yu , Trushin N N , Plyasov A V
Published: May 2020

Torque converters are widely used in the transmissions of self-propelled vehicles for various purposes on wheeled and tracked chassis. A significant drawback of torque converters compared to mechanical transmissions is their relatively low efficiency. Therefore, the task of ensuring high efficiency values of torque converters in the entire range of gear ratios has been of importance since the invention of these hydraulic machines. Torque converters have the lowest efficiency values in the torque transformation mode among low and medium gear ratios from 0 to 0.7. In addition, the nature of the change in efficiency for an integrated torque converter in automatic transition to the fluid coupling mode also usually decreases sharply. This article discusses a number of motor and tractor torque converter designs aimed at obtaining high values of efficiency in the range of small or medium gear ratios. The considered technical solutions are associated with a reduction in energy losses when the working fluid enters the pump wheel of the torque converter.
Acceleration control in active dynamic vibration damper
Authors: Buryan Yu A , Sitnikov D V , Silkov M V
Published: May 2020

The paper deals with the planar problem of vibration isolation. The active vibration damper is mounted on an oscillating mass with a vibroactive unit at a point that does not coincide with the mass center and the action of the vibroactive force does not coincide with the mass center. An active dynamic vibration damper is an electrodynamic drive in which the translational movement of the moving mass is carried out according to information about acceleration from an accelerometer mounted on an oscillating mass with a vibroactive unit. The paper gives an assessment of the vibration isolation effectiveness, depending on the mismatch with the mass center of the vibrational force application points, the settings of the active damper and accelerometer.
Finite element modeling of a multifaceted composite lattice anisogrid payload adapter for launching several spacecrafts
Authors: Khakhlenkova A A , Moskvichev E V , Lopatin A V
Published: May 2020

The paper presents the design of an adapter to launch several spacecraft. The adapter is a multifaceted composite lattice anisogrid shell. The technique for creating a finite element model of the presented lattice adapter is developed. The influence of structure parameters on the fundamental frequency of oscillations is studied. The results of solving the stability problem for flat lattice panels of the adapter during compression and bending are presented.
Some questions of the contact interaction theory in two-roll modules
Authors: Khurramov Sh R
Published: May 2020

The study is devoted to the analysis of contact stresses distribution in a two-roll module. The results of the study of the theory of contact interaction in two-roll modules are presented: an analytical description of the curve shape of the roll contact and determination of the relationship between tangential and normal stresses. Mathematical models of the roll contact curves and the friction stress models in a generalized two-roll module are determined. The obtained models are general in the sense that they are applicable for partial cases of interaction in two-roll modules. Formulas are found for calculating the neutral angles of two-roll modules. Dependencies between the forces acting in the rolls and the stresses distributed under the influence of these forces are stated. It is revealed that these dependences do not change with a change in the angle of supply of the material layer to the line of centers and the angle of inclination of the upper roll relative to the vertical.
Study of the crawler crane stability affected by the length of compensating ropes and platform rotation angle in the mode of movement with payload
Authors: Korytov Mikhail S , Shcherbakov Vitaly S , Titenko Vladimir V , Belyakov Vitaly E
Published: May 2020

Payload uncontrolled oscillations arising during movement of a loaded self-propelled crawler crane at a construction site were reduced by equipping the crane with two additional compensating ropes equal in length and connecting the rotating platform to the load gripping device. This also increased the stability of the entire system. The stability margin moment was used to evaluate the crane stability at individual tipping axes of the crawler support contour. While moving along a random microrelief surface, under the varied length of the compensating ropes and the platform rotation angle, the length reduction increased the mathematical expectation of the stability margin moment for the most loaded lateral tipping axis. The smallest values of the stability margin moment were obtained at the platform rotation angle close to 90 degrees, with the crane stability index being most affected by the compensating rope length. At a zero platform rotation angle, the compensating rope length effect on the stability at the most loaded lateral axis was insignificant. The regression equation of the average stability margin moment affected by the compensating rope length and the platform rotation angle was obtained. The results can be used in the design of advanced self-propelled cable electric crawler cranes.
Studies on dynamic deformations of magnetorheological elastomer
Authors: Minaev A Ja , Korovkin Ju V , Stepanov G V , Valiev H H
Published: May 2020

Oscillograms of changes in the accelerations of amplitudes, phases and oscillation frequencies under the action of specified loads at the input and output of the test sample of magnetorheological elastomer are recorded and analyzed. At the input, the sample is loaded with a smoothly increasing harmonic force arising from the imbalance of the unbalanced rotor of the electric motor. At the output, the sample is loaded with a magnetic field created by a neodymium magnet. A comparative analysis of the accelerations and oscillation phases of the test sample is given. An actively controlled damper based on a magnetorheological elastomer has been developed.
Hydroelastic response of a circular sandwich plate interacting with a liquid layer
Authors: Mogilevich L I , Popov V S , Popova A A , Christoforova A V
Published: May 2020

We considered the formulation and solution of the forced oscillations hydroelasticity problem for a three-layered circular plate contacting with a viscous incompressible fluid layer, the pressure in which varies according to the harmonic law. The plate is the bottom wall of a narrow channel completely filled with a viscous fluid. The axisymmetric coupled hydroelasticity problem consisting of the plate dynamics equation, the viscous fluid layer dynamics equation, and their corresponding boundary conditions was investigated. We obtained the plate dynamics equations taking into account inertia forces in the radial and normal directions in the framework of zigzag kinematic theory. In these equations, the load was expressed by the stresses of the viscous fluid contacting with the three-layered circular plate. The fluid dynamics equations were represented by the Navier-Stokes equations and continuity equation written for the case of creeping fluid flow in a channel. We obtained the forced radial and bending hydroelastic oscillations equations of the circular three-layered plate using the perturbation method. The solution of these equations was represented by a series of eigenfunctions of the corresponding Sturm-Liouville problem. We have also presented the numerical study results of the radial and bending vibrations amplitude dependence on the frequency for the main steady oscillations mode of the plate.
Justification of instrument parameters for the construction soil strength determination
Authors: Tarasov V N , Boyarkina I V , Boyarkin G N , Serebrennikov V S
Published: May 2020

A portable instrument has been introduced in the construction industry of the Russian Federation for the determination of soil strength grades, which is based on the free weight falling principle. Until the present the theory of such instrument hasn’t yet been completely developed and needs to be improved. In this study on the basis of the theorem on normal stresses on surfaces of a cone to be penetrated into the soil, a logically justified theory of the instrument basic parameter selection has been developed. Stresses on horizontal areas of construction soils are equal to twice the stresses on inclined areas of the cone. At the end of the working section of a rod to be penetrated into the soil there is a round flat punch, which area is A=1 cm2. During the punch penetration into the soil by an impact method, a soil compacted cone body appears before the flat punch, which is affected by normal pressure forces and tangential friction forces. For the first time the equation of normal stresses σ1 has been obtained on inclined areas of the soil cone. The mathematical model of the instrument doesn’t contain soil parameters, that allows to recommend it for any soil and media. The obtained analytical dependences allow to design similar instruments in order to measure the soil strength using any value of the falling weight mass. In this paper the instrument parameter justification has been made with the impact weight mass m
1 = 2.5 kg.
Experimental research of vertical movements and accelerations of the drum vibrations of the DM-617 vibratory roller during soil compaction
Authors: Tyuremnov I S , Morev A S , Furmanov D V
Published: May 2020

Rheological modeling of how the elements of a vibratory roller during soil compaction interact with each other allows the optimization of parameters of the roller and soil compaction modes based on the study of the obtained model, as well as the improvement of the soil compaction continuous control system, and the solution of other practically important tasks. To verify the models, it is required to compare the calculation results for the models with experimental data. The paper includes the results of experimental studies of the acceleration range for the vibratory drum of the DM-617 vibratory roller during soil compaction in the steady vibration mode, when the vibration is turned on, and when it is turned off. It is established that during the compaction of the soil in question in the range Evd = 14…25 MPa, the range of vertical movements and accelerations of the vibratory drum in the steady vibration mode does not depend on the soil density. When the vibration is turned on, the vertical movements and accelerations of the drum is 1.5…2 times higher than those of the steady mode. When the vibration is turned off, the vertical movements are increased by 1.5…2 times when passing the resonance zone, and the drum accelerations do not exceed the range of those in the steady vibration mode. The obtained results allow the mathematical models of vibratory rollers during soil compaction to be verified not only in the steady vibration modes, but also in transient modes, including passing the resonance areas when switching the vibration on and off.
Socioeconomic studies in the utilizing of livelihood capital to meet the needs of coastal communities
Authors: Darwis  , Saadah  , Amrullah A , Ibrahim T , Bulkis S , Dzulhajrah A S
Published: May 2020

Punaga Village is a coastal area that has great potential for proper management. The society is very pluralistic and multicultural. This study aims to determine the utilization of capital livelihood owned or easily accessed in meeting needs. Capital livelihoods are generally used by the community in socializing, networking, finding work and building trust among the community. The analysis method used in this study is a descriptive analysis. The limitation of this study is that most populous coastal communities in the village work as farmers. The results of this study indicate that socioeconomic conditions are very influential in the utilization of capital livelihood that is run by the community. Utilization of capital livelihood in socializing activities or building harmonious relationships is expected to build a sustainable economic system.
Histopathological Study of Kidney and Meat of Bungo Fish (Glossogobius sp) contaminated by Lead Metal (Pb) in Lake Tempe, Wajo Regency
Authors: Risna A , Andriani I , Ashraf A , Omar S B A , Sari D K
Published: May 2020

Bungo fish (Glossogobius sp) is one of the freshwater aquatic fish that is in great demand by the community and is endemic in Lake Tempe and is in the Wallacea region. The purpose of this study was to determine the histopathological study of the kidneys and meat in bungos exposed to heavy lead metals (Pb). The samples used were nine bungo fish with nine kidney and nine meat samples each. Measurement of heavy metal content was carried out with Atomic Absorption Spectrophotometry and obtained the lowest metal concentration of 6.52 ppm, moderate 42.02 and the highest 435.30 ppm in the kidney and in meat, the lowest 0.07 ppm, medium 1.56 ppm, and the highest 4.73 ppm. Organ preparations were analyzed using histotechnique methods and they were analized with descriptive qualitative. Based on observations obtained by damage or histopathology that occurs in the kidneys which shows inflammation of the glomerulus, hemorrhage, formation of connective tissue, vacuoles, necrosis, changes in the number of melanomacrophages and also damage to the tubules, whereas damage to the meat does not occur. The level of damage to the tissue depends on the concentration of the metal contaminated in the fish’s organs. Damages that occur are thought to be caused by exposure to heavy metals dissolved in the waters of the fish ecosystem, which have passed the threshold.
Development strategy of rice farming in coastal area of Maros Regency
Authors: Amrullah A , Saadah  , Darwis  , Ibrahim T , Busthanul N , Bulkis S , Dzulhajrah A S , Putri D A
Published: May 2020

This study aims to formularize the strategy of developing rice farming in Maros Regency. A sampling of the study area used the census method by taking the entire population into a sample of 23 farmers who were members of the Pajalayya Baru Farmer Group and key informants as many as two people consisting of village officials and extension workers. The results showed that the rice farming development strategy that could be applied in Kuri Caddi Hamlet, Maros Regency, namely utilizing labor to cultivate land given to farmers, proposed agricultural technology such as tractors, threshing machines, seeds, fertilizers with the support of farmer groups, improving the quality of human resources with become an active member of the Farmers Group, conducting comparative studies in areas with more advanced agriculture, carrying out mitigation actions such as maintaining the stability of the coastline, maintaining the balance of nature, not destroying coral reefs on the coast, making new innovations to develop farming, and cooperating with farmer shops to procurement of agricultural inputs.
Determination of birdwatching tourism locations for red-knobbed hornbill (rhyticeros cassidix) around lake Lindu, Lore Lindu National park, central Sulawesi
Authors: Ardi B , Suardi Fridollyn H.
Published: May 2020

Red-knobbed Hornbill (Rhyticeros cassidix) is a Sulawesi endemic hornbill. This bird is a species of bird that was used as a mascot by Lore Lindu National Park. Red-knobbed Hornbill population is spread in almost the entire Lore Lindu National Park area, especially around Lake Lindu. Lake Lindu is a lake located in the Enclave Lindu region, located in the utilization zone and the rehabilitation zone of the Lindu Resort, Lore Lindu National Park. The conditions around the lake are highland rainforest and settlement. Red-knobbed hornbills are generally easy to find in forest areas around lakes or settlements. Red-knobbed Hornbill has the potential as an object of natural tourist attraction, especially for special ecotourism or birdwatching, therefore it is necessary to know locations that have a high frequency of attendance. The purpose of this study was to determine the distribution of Red-knobbed Hornbills around Lake Lindu. Retrieval of data using the point count method combined in a transect line that is placed scattered around Lake Lindu. Data collection includes the number of Red-knobbed Hornbill individuals, habitat, time of attendance, and access from the settlement. Determination of birdwatching locations based on the results of scoring the number of individuals, habitats, and access from settlements. The results showed that there were eight Red-knobbed Hornbill monitoring locations around Lake Lindu. Red-knobbed Hornbill is active from 6:00 to 10:00 and 14:00 to 18:00. The presence of feed trees (Ficus sp.) Affects the level of the presence of Red-knobbed Hornbill. The research is expected to be used as input for management of birdwatching tours around Lake Lindu.