bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of asphalt concrete strength properties on energy intensity of milling
Authors: Furmanov D V , Lysakov N E , Shamahov L M 
Published: May 2021

Abstract
Asphalt removal is a complex, energy-intensive technological operation. The paper is devoted to the research of power and energy properties of cutting by the cutting elements of road milling machines. We have analyzed works devoted to the development of different road-building materials; based on the analysis, we deem it possible for the correlation to exist between the strength properties of asphalt concrete and the cutting resistance forces produced by the working units of road milling machines. The most suitable strength property is the contact strength of asphalt concrete determined by the static penetration method. The paper describes the methodology of experimental research in this area and presents the results of experimental studies. We prove a direct correlation between the tangential component of the cutting resistance force and limit contact stresses for three types of asphalt concrete. This makes it possible to quickly and reasonably determine the cutting resistance forces when milling asphalt concrete of different grades at different temperatures without having to conduct complex, expensive research. The established relationship between the asphalt concrete contact strength property and the tangential component of the cutting resistance force suggests that the asphalt concrete strength properties previously determined by temperature, composition, and structure can be replaced by one, namely, its contact strength. This can replace the huge list of existing materials with a single parameter — contact destruction strength.
Effect of the acrylonitrile content in nitrile-butadiene rubber on the relative residual deformation of vulcanizate
Authors: Ilyicheva T M , Eremin E N 
Published: May 2021

Abstract
The paper presents the results of a study of rubbers based on butadiene-nitrile rubbers (NBR) grades BNKS-40 and BNKS-18. The influence of the content of acrylonitrile (NAC) on the rheological and physico-mechanical properties of vulcanizates has been evaluated. It is shown that the content of NAC in the NBR composition significantly affects the relative residual compression deformation of the vulcanizate both under normal conditions and at elevated temperatures. The dependencies revealed in the work make it possible to make the correct choice of the rubber grade in the development of rubber resistant to compression deformation.
Study of magnetically active elastomers resonance and damping properties
Authors: Minaev A Ja , Korovkin Ju V , Stepanov G V , Valiev H H 
Published: May 2021

Abstract
The dynamic properties of magnetically active elastomers based on silicone polymer matrix with various ferromagnetic fillers under the external magnetic fields influence using a vibration-testing complex have been studied. The amplitude-frequency characteristics and the investigated composites resonance frequencies changes under such influences are established. Calculated dependences for determination tested samples damping properties are given. Analysis of the obtained data revealed a damping coefficients decrease in the investigated materials with an magnetic forces increase acting on the investigated magnetoactive elastomers.
Features of laser shock processing application to titanium alloys with shape memory
Authors: Sakhvadze G Zh , Splavskiy I S 
Published: May 2021

Abstract
The paper presents the features of applying the methods of dimension analysis and finite element simulation in relation to the processes occurring during laser shock processing (LSP) of titanium alloys with the shape memory effect (SME). It is found out that the main dimensionless parameters that control the depth of the plastic zone that occurs during LSP are the dimensionless duration of the laser pulse and the peak pressure in the shock wave. A comparative assessment is made between the simulated dependence of the dimensionless depth of the plastic zone on the dimensionless peak pressure in the shock wave and the corresponding experimental studies from the existing publications.
Computer simulation of substrate effect on 2D ferromagnetic film state
Authors: Belim S V , Tikhomirov I V 
Published: May 2021

Abstract
In the article computer simulation of ground state for two-dimensional film on the substrate is performed. The influence of the substrate is modeled using a periodic potential. The potential contains a parameter defining the width of the maxima and minima. The film has a simple square crystal lattice. The substrate potential structure models a square lattice. We consider the case of different film coating ratio ratios. The lattice and substrate periods are also different. If the coating coefficient is different from one, mechanical stresses are present in the film. The case with one fixed edge for the film and periodic boundary conditions was investigated. The film atoms do not form a square lattice in this case. The displacements of atoms are periodic. The period depends on the coating factor. A superlattice is present in such film.
Influence of thickness nonuniformity of piezoelectric zinc oxide layer on parameters of microelectronic BAW solidly mounted resonator
Authors: Torgash T N , Kozlov A G 
Published: May 2021

Abstract
The paper presents the experimental results of a study of the influence of the thickness nonuniformity of a piezoelectric zinc oxide films on electrical equivalent parameters of microelectronic BAW resonators: the static and dynamic capacitances, dynamic inductance, and dynamic resistance. These parameters were determined using the experimental frequency dependences of resonator impedance and the Butterworth-van Dyke model. The resonators under investigation had an operating frequency of 2.8…3.0 GHz; the frequency spread about 500 MHz. The quality factor of the resonators was 250…350 and the relative width of the resonant bandwidth of the resonators were equal to 0.2…0.4%.
Geometrically nonlinear calculation of thin shells taking into account shear deformations when using the form of interpolation of the sought quantities
Authors: Klochkov Yu V , Ishchanov T R , Andreev A S , Klochkov Yu M 
Published: May 2021

Abstract
Annotation. A finite element model for the analysis of geometrically nonlinear deformation of a thin-walled shell-type structure based on the principles of the Timoshenko type shear theory is proposed. As the basis of this model, we consider a fragment of the surface of the object under study in the form of a curved quadrilateral with nodes that coincide with its vertices. The desired unknowns at the nodes of the curved quadrilateral were the increments of the components of the displacement vector and the partial derivatives of these increments with respect to the natural coordinates of the surface of the shell object under study, as well as the increments of the components of the vector of the angles of rotation of the normal. To obtain interpolation expressions for the desired values, we implemented a fundamentally different vector form of the interpolation procedure from the standard one. The principal distinguishing feature of the above-mentioned form of interpolation is the compilation of interpolation dependencies not for each desired variable parameter as an isolated scalar value, but for the increment of the displacement vector and the increment of the vector of the angles of rotation of the normal, which act as interpolation objects. As a result, in a curved coordinate system, original interpolation dependencies were obtained for the increments of the components of the displacement vectors and the angles of rotation of the normal at an arbitrary point of the quadrilateral, which are functions of the nodal values of all the increments of the components of the above-mentioned vectors, and not just the increments of the components of one particular direction.
The effect of heat transfer on the stress-strain material state considering the final rate of heat spread
Authors: Proskuriakov N E , Lopa I V , Zverev I V 
Published: May 2021

Abstract
Calculation results of different wave tasks are analyzed. It is shown that deformation heating of material is intensive near the boundary surface and quickly decreases during insignificant removal from it. The conclusion is drawn that for obtaining exact solutions of wave tasks in nonisothermal statement it is necessary to consider redistribution of temperature in materials because of the heat transfer and its influence on the intense deformed condition of materials of different designs. Calculation results are given. The sensitivity of the decision to change of specific heat capacity and the thermal diffusivity entering wave equation of heat conductivity is noted.
Investigation of the modes of motion of a hydraulic drive with axial-piston hydraulic motors at low speeds
Authors: Syrkin V V , Galuza Y F , Abramova I A , Treyer V A 
Published: May 2021

Abstract
Technological machines for various purposes, in which hydraulic actuators are widely used, are constantly being improved in terms of power, speed and accuracy of the specified parameters. It requires making certain changes in the design of these actuators that allow them to withstand the operating modes of technological machines within the specified limits. The article considers the results of the study of the operation modes of a nonlinear hydraulic actuator with axial-piston hydraulic motors under the conditions of parametric excitation of self-oscillations due to the nonlinear nature of the friction moment in the front distributor of the hydraulic motor. The authors propose mathematical models of the modes of operation of this hydraulic drive at low speeds. They present a linearized mathematical model and the results of the study of this hydraulic drive in the form of amplitude-frequency characteristics obtained using the harmonic linearization of the dynamic equations. The results of the study allow us to estimate the parametric oscillations of the hydraulic actuator and to evaluate the minimum value of the constant component of the speed corresponding to the beginning of periodic intermittent motions, which leads to a decrease in the accuracy of performing technological movements of the actuators of technological machines.
Effect of Emulsion Powder Content in VAE Emulsion on Tensile Properties of Joint Filler
Authors: Huang Zhe , Xu Jinyu , Xia Wei , Ren Weibo , Wang Zhihang 
Published: May 2021

Abstract
The traditional joint filler used in our country is easy to be damaged by the environment. At present, polymer composite is used to form a new type of polymer joint filler (NPJF) to improve the properties of joint filler. In this paper, by comparing and testing the various indexes of the joint filler under tensile load under the condition of 5 kinds of latex powder content, the performance of the joint filler after molding was studied. The results show that the tensile strength and tensile modulus of the joint filler increase with the increase of latex powder content, the elongation at break and peak strain decrease first and then increase. The influence of the amount of latex powder on the tensile properties of the joint filler mainly lies in the improvement of the aggregate ash ratio, the formation of the film structure and the change of the overall microstructure.
Research on Urban Architecture Landscape Design Based on Virtual Reality Technology
Authors: Wang Meizhen 
Published: May 2021

Abstract
With the continuous escalation of architectural design requirements, the continuous complexity of architectural models, and the integration of computer technology, virtual reality technology in architectural design has also emerged. The application of virtual reality technology in architectural design deepens the communication between professional architects and non-professionals, makes the architectural effect more intuitive, and effectively solves the communication barriers between architects and non-professionals. This article discusses the basic theory of virtual reality technology, and studies how to apply virtual reality technology in the landscape design of modern cities. On the premise of analyzing traditional landscape design methods, analyze the disadvantages of traditional landscape design methods; by studying the advantages of virtual reality technology, we choose to construct some scenes of urban architectural landscape design for virtual reality models. The article combines virtual reality technology with architectural design to effectively solve some of the shortcomings of traditional urban landscape design.
A data-driven method to minimize sensor use for dynamic shading control
Authors: Zhu Jiaqi 
Published: May 2021

Abstract
Dynamic facade systems are a promising strategy to balance the benefits and drawbacks of daylight penetration through the window in a built environment. A well-operated shading system should allow for sufficient daylight access while preventing glare in response to changing weather conditions. The dynamic shading system can also help with making use of daylight to reduce the lighting energy use when integrated with electric lighting control. This paper presented a data-driven approach to control the automated shading system. The control method allows the system to be responsive to outdoor weather conditions. With data from offline daylight simulation using typical meteorological year weather, three machine learning classification algorithms were applied to train predictive models for online shading control. The proposed method was validated using a climate-based simulation. It was found that all models had a satisfying prediction performance, with an accuracy of 0.85 to 0.92. The shading control could maintain the work plane illuminance for 97% to 99% of the time during the year. It was also associated with a potential of reducing electric lighting energy use by 40% to 43% compared to that of on/off lighting control.
Study on the mechanical property of low magnesia ore high strength concrete-filled steel tubular columns
Authors: Gao Huaguo , Zhang Lingxin , Xu Shilin , Wang Qingli , Wen Shuqing , Wang Yinbiao 
Published: May 2021

Abstract
The high strength low magnesia ore concrete-filled steel tubular (CFST) column under eccentric loading was studied in this paper. The experiment of seven groups of different eccentricity ratio was conducted, and the details of experiment and test methods were introduced. The experimental ultimate load of each test was compared with design loads from several domestic specifications, and the bearing capacity of specimen with different confinement index was simulated. The results of load-vertical deflection curves show that when the eccentricity is the same and the capacity is 12% higher than that of steel tube high-strength concrete eccentrically compressed short columns, the distribution of longitudinal strain along the section height of steel tube in the two types of short columns basically conforms to the assumption of flat section. According to the results of the research, it was suggested to adopt confinement index of 1.1-1.4 in the practical project with the same to the common high strengthen concrete, and the layout of small eccentric load should be used in the structural design so as to better utilize the mechanical properties of the materials.
Research on the design of the integrated wall panel of the prefabricated building in substations
Authors: Li Teng , Guo Jia , Hu Shiyao , Chai Linjie , Jing Zhipeng , Cheng Rong , Wang Zhongliang 
Published: May 2021

Abstract
In order to meet the needs of the modular construction and prefabricated construction of the State Grid Corporation of China, higher performance requirements are put forward for the wall panels of the building. Integrated wall panels have the advantages of high integration, high assembly, short construction period and good construction quality, which can effectively reduce on-site wet work and have significant economic and social benefits. This article combines the actual engineering and existing construction technology to explore the technical application of the integrated wall panel design for assembly buildings in substations, which provides a reference for the future development of assembly buildings.
Research of electric field strength on surface of conductor and its splitting type used in extra high voltage substation
Authors: Shiling Zhang 
Published: May 2021

Abstract
Extra high voltage substation is an important part of the whole project locates in high altitude area, so corona audible noise exists around the operation equipment, mainly concentrated in the bundle conductor in the power station. This research on the split form and surface electric field intensity distribution of bundle conductor has a certain degree of theoretical and practical engineering application value. In this paper, an analysis of the classic formula illuminates the conductor split form, conductor diameter, bundle spacing and other factors how to affect the largest surface electric field intensity of the conductor. On this basis, we take a typical extra high voltage substation conductor as the research object. The three-dimensional model of the actual power station has been established with application of finite element simulation method in accordance with actual structure, and a preliminary calculation of surface electric field intensity also been obtained. According to the results, we analyze the reasons cause the serious corona. Then we design three-split conductor instead of two-split one, and make a comparative analysis between the two different forms. According to the three-split form mentioned above, the conductor diameter and bundle spacing are optimized. The research on the electrical field calculation and split form of bundle conductor provides references for the design of substation, and has practical value for the reduction of corona noise.
Research on design of the prefabricated foundation in substations
Authors: Li Teng , Wang Yamin , Chai Linjie , Hu Shiyao , Rong Chunyan , Shen Yongpeng , Hao Junkui 
Published: May 2021

Abstract
With the development of power engineering, higher requirements are put forward for construction period, project investment and social environment. Traditional wet operation methods restrict the rapid development of power engineering construction. The use of prefabricated foundations in the design of substations can effectively reduce on-site wet operations, reduce construction cycles, save labor costs and increase assembly rates. This article takes the prefabricated foundation design in substation as the research object, combines actual engineering and existing construction technology, explores the technical application of the prefabricated foundation design in substation and provides a reference for the future development direction of prefabricated buildings (structures).
Analytical Modeling of Modulated Rotating-Blade Noise : the Skipping Rope and the Darrieus Wind Turbine
Authors: Roger Michel , Moreau Stéphane 
Published: May 2021

Abstract
The present study is about the modulations of the aerodynamic broadband noise heard from slowly rotating rotors with few blades. It is aimed at producing a fast-running prediction tool that could be used to assess the nuisance of Vertical-Axis Wind Turbines (VAWT) in the context of urban installation. The simpler case of a skipping rope that only involves part of the modulation effect is addressed as a first step. The rope is split into segments for which an instantaneous sound-radiation model exists to yield an overall spectrogram. Finally, its time signature is reconstructed by additive synthesis. After inspection of existing databases from oscillatory-airfoil experiments, needs for data representative of the dynamic stall of VAWT blades are seen as the missing block to reconstruct a synthetic spectrogram.
Influence of cavitation on the acoustic boundary conditions in water hammer experiments
Authors: Klein Sebastian , Traudt Tobias , Oschwald Michael 
Published: May 2021

Abstract
A water hammer event is created by stopping a flow in a pipeline using a fast closing valve. The pressure is measured at three different positions upstream the valve. Cavitation occurs close to the valve and is detected by vapour pressure in the pipeline. Frequencies in the liquid part of the pipe were measured and statistically evaluated in order to analyse whether cavitation acts as a boundary condition of acoustics.
Without cavitation one side of the pipe is an open end, while the other side is a closed end. In presence of cavitation the cavity should act like an open end due to the high change of acoustic impedance from liquid to gaseous phase. Therefore it is expected that the oscillating behavior is changing from an open/close to an open/open system. The measured frequencies indeed show a change towards an open/open configuration. It is shown that cavitation acts as a boundary condition in this system.
Flow Structure within an Aggressive S-Shaped Intermediate Compressor Duct
Authors: Kasper Aaron , Hergt Alexander , Stürzebecher Thomas , Grund Sebastian , Flamm Jasmin , Nicke Eberhard 
Published: May 2021

Abstract
As part of Clean Sky 2 (Engines ITD), a working group, formed by the DLR Institute of Propulsion Technology, MTU Aero Engines and GKN Aerospace, is setting up a complete compression system module (LPC/ICD/HPC). The aim of the project is to shorten the intermediate compressor duct (ICD), which connects the low pressure compressor (LPC) and high pressure compressor (HPC). This leads to a reduction of the axial length and weight of the overall engine and thus a reduction of the specific fuel consumption. In order to identify measurement-technologies and mitigate risks for this experimental set-up, a non-rotating testrig was set up in advance to investigate two different test vehicles. In a first step an ICD demonstrator was set up, which had a reduced axial length of 25%, compared to currently operating designs. This design predicted no separation or performance losses inside of the aggressive s-shaped contour. In a second step another demonstrator was installed with an even shorter axial length of 50% axial length reduction, compared to todays state of the art configurations. In this demonstrator the design was chosen to exceed the functional limit according to today’s CFD prediction and thus explore the potential for further length reduction in the future and to create a data base for numerical tool validation. The two configurations were tested at DLR Cologne. The test channel offers the possibility to use a variety of different measurement techniques to determine the flow behavior inside the ICD. This paper presents the oil streak pattern taken on the hub area between the struts and the ones taken on the pressure and suction side of the outlet guide vanes (OGV- LPC) for both demonstrators.