bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of the technological process and equipment of complex profiled parts
Authors: Malea C I , Nitu E L 
Published: September 2020

Abstract
The modernization of the manufacturing industry requires the development of the manufacturing process and technological equipment, in general, but also for the realization of the complex parts. These components with complex geometries and multiple functional roles, for the most part, are safety parts manufactured from materials with superior physicochemical characteristics that have demanding technical quotas and conditions, leading to difficulties in establishing the processing methods and technological equipment used. For those considerations, it is proposed a three-stage design-optimization algorithm and an additional step, which represents a balanced and rational approach to technological process issues and in the manufacturing system. The first stage shall determine the optimal number and succession of operations based on a technological graph and the associated mathematical model, in which the objective function and the restrictions are defined concerning the purpose pursued. The second stage establishes, for each technological operation, the optimal orientation and fixation scheme (O-OFS) of the semi-finished part, which ensures the precision of machining and the technological process productivity, applying elements, of the sets theory and the global utility method to the method of optimizing of orientation and fixation of the parts. In the third step, based on the optimal orientation and fixation scheme, a mathematical model is formulated for the adapted technology chart to describe the construction variants of the orientation supports, and to provide the optimal device construction solution to the analysed operation. In situations where a reconfiguration of the technological system is desired, the fourth step of equipment optimization of the entire technological process is proposed.
The evolution of loading capacity in belt transmissions
Authors: Manolache-Rusu I C , Românu I C , Muscă I 
Published: September 2020

Abstract
Belt transmissions were one of the first ways to transfer rotational motion and torque between shafts, and are still remaining in the spotlight for a variety of applications. The paper presents some aspects regarding the efficiency of a flat belt transmission contaminated with starch powder. An original test rig was conceived and built in order to evaluate the loading capacity and efficiency of a flat belt transmission. Using this test rig the values of shafts speeds and the reaction forces generated by the transmitted torque were measured. Several tests were conducted, with and without starch powder as contaminant. The contamination level was evaluated by aid of a particle sensor. Two levels of contamination were applied and the results were compared to those obtained without contaminants. The experimental results reveal that loading capacity of the transmission increases with the concentration of the starch powder.
Technical project management for meeting high quality requirements of machined parts
Authors: Monica Z , Czupryński A 
Published: September 2020

Abstract
A project is a sequence of unique, complex and related tasks that have a common goal, and which are intended to be completed within a specified period of time without exceeding the set budget, in accordance with the previously assumed requirements. In the case of typical technical projects two situations are possible. If the parameters of the manufactured element turn out to be correct (they meet the technological requirements), then the angle of the main surface is corrected, i.e. the change in the plane’s geometry, which is supposed to improve the parameter of the element. If its parameters are not correct, it means that an error occurred during machining and its surface should be improved. This sequence is conducted to fulfill the quality requirements. In the paper is presented the results of investigation the process of improving the technological process.
Business process modeling for flexible tasks workflow
Authors: Olender M 
Published: September 2020

Abstract
Implementing new solutions in the production hall and offices, companies are looking for solutions that will support the execution of production orders and increase their competitiveness. These changes are caused by new technologies and opportunities by industrial development. These possibilities give a set of solutions that were unknown or impossible to implement in the past. As enterprises develop, they should point on aspect of decision support systems and business process modelling out to. Due to new technologies and IT development, appropriate management of the production processes and business is required. In the article focused on modelling business processes in enterprises. An algorithm for making decisions support in enterprise was also presented.
Generative design for assembly wrapping up
Authors: Pomazan V M , Sintea S R 
Published: September 2020

Abstract
Design automation is a growing trend in the CAD world that reduces the amount of time it takes to complete a design and speeds up time to market. In practice, a design method known as generative design is one of the main way CAD automation is used.
Generative design is a tool that generates designs for a given loads and constraints setup. Designers or engineers input design goals into the generative design software, along with parameters such as performance or spatial requirements, materials, manufacturing methods, and cost constraints. The paper presents a case study of an assembly to be wrapped via optimization criteria, in simpler, manufacturable product, using generative design that automatically produces variations based on automated computing.
Using Autodesk’s Fusion 360, unique variations are produced, and a lighter and stronger product is proposed, after iterations based on specific criteria. The software explores all possible variations of a solution and quickly generates design alternatives. It tests and learns from each iteration. The present work offers an insight on the criteria and user input in specific moments of the automated design process.
Data-driven digital twin model for predicting grinding force
Authors: Qi B , Park H-S 
Published: September 2020

Abstract
Digital twin gives a new approach for predictive and monitoring of manufacturing machines which can consider the influence of working condition on grinding wheel and application of prediction. In this article, we a develop methodology for grinding force prediction using digital twin approach, with the vertical double side grinding machine performing the required work while connecting the PLC program. The proposed approach integrates the information obtained from sensor data, physic models, and operational of system to establish the grinding machine model. Data driven modelling and quantification of the model form uncertainties associated with the resulting reduced order models. Simulation results show the proper connection between models and communication. The digital model was programmed to exactly match the operation of the physical system.
Improvement of structures seismic response based on pendulum systems with double sliding surface
Authors: Scheaua F 
Published: September 2020

Abstract
The seismic isolation of the construction structures is of particular importance because the optimum stability premises of the structures during the seismic events are ensured. There are different isolation methods but based on the structure base isolation principle, the friction pendulum bearing systems (FPBS) have been used with good results in equipping new structures and also in rehabilitating of the old buildings that had to be consolidated. The double surface friction Pendulum (DSFP) bearing is an improved version of the well-known single concave friction pendulum bearing (FPBS). The principal benefit of the DSFP bearing is represented by its capacity to accommodate substantially larger displacements compared to a traditional FPBS of identical plan dimensions. Moreover, there is the capability to use sliding surfaces with different radius of curvature and friction coefficients, offering the designer greater flexibility to optimize the protective system performance. Through these systems good seismic isolation results are achieved for the building structures where mounted interposed between the foundation and the superstructure realizing the disconnection between the two structural elements. The disconnection is important because the insulated structure vibration period is modified in the sense of its significant increase, also with the increase of structure lateral flexibility, ultimately reducing the ground acceleration and avoiding the efforts vertical transmission to the isolated structure upper levels. The double surface friction pendulum system ensures an important modification of the isolated structure behavior materialized through the seismic response mitigation. This paper describes the double surface friction bearing (DSFP) constructive details with operation principles and also presents some numerical analysis results related to force–displacement relation considering different values of curvature radius and friction coefficients of the two friction surfaces used
Analysis of stability characteristics for modern passenger multirole boat
Authors: Scurtu I C , Poenaru V , Tsarev R 
Published: September 2020

Abstract
A modern passenger multirole boat (MPMB) is designed to serve specific requirements and missions but when it comes to pleasure crafts it has to dispose certain functional characteristics with a specific hull weight distribution, while having certain stability along with aesthetic appeal and stream lined hull. In recent years, there has been greater focus towards issues related to diversity of MPMB leading to development of newer designs and improved stability. The performance of these MPMB comprises of two distinct phases: the design analysis and the identification of the materials used for boat construction. Maximum value MPMB Righting Arm is 1.34 m was determined for 21.76 degrees. This paper will present the design analysis and stability characteristics for modern passenger multirole boat with a calculated stability for passenger use.
The two-dimensional fretting contact with a bulk stress. Part I – Similar elastic materials
Authors: Spinu S 
Published: September 2020

Abstract
Minute relative motions along the interface of contacting machine elements, brought about by cyclic tangential loading, lead to failure of many mechanical components from fretting fatigue. From the point of view of applied mechanics, the understanding of the fretting fatigue rely on the modelling of contact problems with partial slip. The experimental simulation of fretting fatigue often implies cylindrical pads in contact with a flat specimen, leading to a plane strain contact scenario requiring the solution of the two-dimensional contact problem. The numerical solution for the latter problem is achieved in this paper for similar elastic materials by employing the technique of influence functions, derived from fundamental half-plane solutions of point forces acting on the boundary. The contact model is first divided into two parts with solutions more easily to obtain. The linear systems with the normal and shear tractions as unknowns are solved with the conjugate gradient method, which can be applied for symmetric and positive definite system matrices. The most time-consuming operations are the convolutions products assessing the displacements induced by the contact tractions. A method based on the fast Fourier transform is applied for increased computational speed without sacrificing accuracy. The proposed algorithm was benchmarked by reproducing the solution of the classic two-dimensional Cattaneo-Mindlin problem. In practical situations, other loadings besides the contact itself may induce bulk stresses within one or both of the contacting bodies. New results are obtained by introducing a bulk stress, thus replicating the conditions from fretting fatigue experiments. The advanced numerical program for the two-dimensional contact with partial slip proves itself as an efficient tool for the understanding of the fretting fatigue by numerical modelling and simulation.
Experimental determination of stress and strain states of the guitar’s wood structure
Authors: Stanciu M D , Bârsănescu P , Goanță V , Savin A 
Published: September 2020

Abstract
During the playing, the wood from guitar structure is subjected to stresses due to the strings tension. The paper aims to determine the stresses and strain states of wood from guitar structure in different stage of strings tension. So, a classical guitar made from Romanian factory was investigated. For experiment, the method of electrical resistance tensometry was used. On the top of guitar, near of bridge and sound hole were applied two stacked rosette type C2A-06-062WW-350 and two on the neck of guitar. The strings were tensioned to the specific value of producing the musical note. The signals of sensors were captured by Vishay P3 Input Strain Indicator / Recorder. Applying the elasticity theory of orthotropic materials as wood, the main strains and stresses were determined. The results emphasized that tensile and compression stresses are produced in guitar body and the higher values of strains are recorded in the bridge area and in the guitar neck, the 8th fret.
Artificial neural networks applied to prediction of surface roughness in dry drilling of some polymers
Authors: Tabacaru V 
Published: September 2020

Abstract
Polymers become more and more attractive for automotive and aerospace industries due to their remarkable mechanical, thermal and electrical properties that make these materials suitable for many industrial applications. Machining of polymers is of a great interest among researchers and engineers due to the possibility of replacing expensive materials with plastics that have similar mechanical characteristics, but of a lower cost. Drilling is the most common mechanical machining operation in manufacturing of parts. Within this context, it is essential to analyze this cutting process and find the best solution for controlling the output parameters of the process, such as surface roughness and cutting forces. The present work concerns the developing of an artificial neural model for the prediction of surface roughness in dry drilling of some polymeric materials: high density polyethylene (grade HDPE 1000), polyamide (grade PA6) and polyacetale (grade POM-C). The neural model was built based on trial-and-error method, by modifying the number of hidden layers and the number of hidden neurons on each layer. The experimental plan was designed to be suitable for artificial neural network prediction. The aim of experimental work was to study the effect of cutting parameters (spindle speed, feed rate and drill diameter) on the quality of machined surface (surface roughness). This paper proposes a neural model that is able to predict the surface roughness considering not only the cutting parameters, but the type of material. Moreover, a study concerning the accuracy of the neural model depending on the number of hidden layers and the number of hidden neurons on each hidden layer was carried out. The predicted values of roughness were compared with experimental data in order to determine the precision of the neural model.
Study on the influence of recycled material on the tensile strength of HDPE products
Authors: Teuşdea D F , Stan D V , Vodă M , Lovasz E C 
Published: September 2020

Abstract
The content of this paper concerns to the new tendency in industry, the concept of circular economy, based mainly on the decrease in plastic waste pollution by recovery and at source and on the significant optimization of production costs. The mechanical tests have been made on handles injected from several mixtures of grinded HDPE, with different melt flow rates and in different proportions, in order to establish the conformity of the final product to the imposed technical specifications regarding the breaking strength of this. For the industrial application, an important result is the validation of the recipes proposed for the preparation of raw material from recycled HDPE for which the final injected product preserves the physical-mechanical properties within the imposed limits. The study shows that in certain cases, for the preparation of the raw material, it could be used up to 100% recycled material, without affecting the technical specifications of mechanical resistance imposed on the final product.
Facilitating of knowledge transfer in a software development company
Authors: Țîrlea A V , Bădilă M I , Kifor C V 
Published: September 2020

Abstract
In an organization, knowledge transfer between its members is vital. Most studies conducted up to this date have focused on knowledge transfer in the field of industrial production. If in this branch of knowledge, where operations and processes have a certain degree of standardization and repeatability, this is done through initial and possibly periodic training, in the matter of software development things are more complicated. Tasks do not resemble with each other, most are unique and often require documentation before being resolved. Obtaining documentation from external environments often involves work on adapting to the organization’s requirements and to the project’s requirements also. In an organization without a constant direct interaction between the members, the transfer of knowledge requires much labor. In this paper, we propose the design and implementation of a software solution that will facilitate the transfer of knowledge between the developers of a software development company. This internal database will include the solutions identified, adapted, and used by programmers to solve non-familiar tasks. Also, a collection will be created with the errors encountered throughout the development and implementation process and their resolution, useful for all members of the organization. Every time a team will meet an unfamiliar functionality in an assigned task, it will consult the internal database. In this way, the solution will be easier reached and adapted from the source. External sources of documentation and research will only be used if the internal search has not returned a solution to the problem. In this case, following the solving steps, the familiar solution will be added to the internal database for future use. Finally, we will measure the benefits of the proposed and implemented solution. Ultimately, the rate of use of a solution stored in the database over a period of time will be measured, along with the average time of solving a task in the development process, when making use of the internal knowledge and solutions base.
The influence of rheological properties of diesel fuel in the pumping process for collapsible pipelines in low temperature conditions
Authors: Drozdov D A , Plotnikova K M , Seoev L V , Elkin A V 
Published: September 2020

Abstract
The results of studies of the influence of rheological properties of diesel fuels on the pumping process for collapsible pipelines in low temperature conditions. It is established that diesel fuel when they are cooled below the solidification point represent a viscoplastic medium with curves of current, which describes a universal equation of Buckley-Herschel. A refined method for hydraulic calculation of collapsible tubing to determine the head losses to reflect changes in the rheological properties of diesel fuels at low temperatures. The simulation of the processes of transfer of winter diesel fuel for collapsible pipelines in low temperature conditions and offers recommendations for their application in low-temperature conditions.
On experimental determination of the elastic and strength properties of anisotropic rocks
Authors: Karev V I , Kovalenko Yu F , Sidorin Yu V 
Published: September 2020

Abstract
Influence of anisotropy of elastic and of strength properties on the stress-strain state near wells and openings is considered. The choice of parameters characterizing both types of anisotropy is discussed. A method of experimental determination of the parameters characterising anisotropy of both elastic and strength properties from the direct measurements using true triaxial loading systems is described.
Ecological State of Technogeneous Saline Soil of Oil-Contaminated Alluvial Ecosystems and Their Remediation Techniques
Authors: Vladimirovna Nosova Mariya , Petrovna Seredina Valentina , Sergeevich Rybin Alexander 
Published: September 2020

Abstract
The article discloses the trends of technogenic salts distribution in alluvial soils contaminated with oil and petroleum products. The salt distribution was examined in the lateral direction – impact zone, oil contamination boundary, as well as radial salts distribution within the soil profile (to 100 cm depth). Specifics and chemistry of technogenic halogenesis process (freely soluble including phytotoxic salts content, qualitative composition, migration and distribution trends) has been identified for soils of different contaminated zones. It was revealed that technogenic salinization of alluvial soils (that is the end body of the cascaded geochemical systems) is an essential geoecological factor contributing to formation within oil-contaminated areas of new technogenic soil-geochemical successions – chemical-contaminated soils, showing the features of salinity not typical for humid climate. The technique of technogeneous saline soil remediation was suggested based on indigenous halophyte plants phytomelioration sowing.
Effect of heating rate during annealing on microstructure and texture evolution of AA8021 aluminum foil
Authors: Chen Wei , Chen Minghe , Jin Xiaojie , Zhang Peng 
Published: September 2020

Abstract
The microstructure and texture evolution of AA8021 aluminum foil during annealing at 270 °C with heating rates of 10 °C h−1 and 40 °C h−1 were investigated by the optical microscope (OM), microhardness tester, field emission scanning electron microscope (FE-SEM) and x-ray diffractometer (XRD). The results show that the microhardness of aluminum foil gradually decreases during the heating process, and the microhardness of aluminum foil with the heating rate of 40 °C h−1 is higher than that of 10 °C h−1. After annealing at 270 °C for 16 h, the average grain size of aluminum foil with the heating rate of 10 °C h−1 is 13.0 μm and the maximum grain size does not exceed 35 μm, while the average grain size with the heating rate of 40 °C h−1 is 14.6 μm and its fraction of the grain area of greater than or equal to 40 μm is 2.4%. The slow heating rate is beneficial to grain refinement of AA8021 aluminum foil due to the release of most deformation energy in the low temperature stage during heating, which leads to the decrease of driving force for crystal nuclei growth. Under the two heating rates, the texture components of the material after annealing are basically the same, mainly the recrystallized Cube, R textures and the residual rolling textures.