bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Communication Module of Communication or Automation Equipment
Authors: Yang Yi , Fu Yingfeng 
Published: January 2021

Abstract
In order to give full play to the application functions of communication or automation equipment, we need to strengthen the research work of communication modules. Especially in some production places where the environment is more complex, we must ensure that the communication module has the data collection function, only in this way can we achieve automation and intelligent operation. In the process of researching the communication module, we need to realize wireless data transmission and control. At the same time, we also need to ensure the stability of data, and realize the wireless operation function, and use the application function of communication or automation equipment to ensure the stability of information and data transmission.
Molecular dynamics simulation of water diffusion in mixed insulating oil at different temperatures
Authors: Wei Z J , Sun C H , Chen B T , Xu Y J , Wu S W , Wang D Q 
Published: January 2021

Abstract
The effects of temperature and moisture on the mixed insulating oil micro-characteristics were investigated by molecular simulation. In order to analyse the mechanism of action between insulating oil and water molecule, the mixed insulating oil model consisting of mineral oil and natural ester with different mass ratio and different moisture content was established. Through the research of hydrogen bonding, radial distribution function (RDF) of oil molecules and the diffusion coefficient of water molecules, it shows that the higher the natural ester content in the model, the more the number of hydrogen bonds, the bigger the peak value of RDF, the smaller the diffusion coefficient of water molecules. At the same time, the increase of temperature weakened the binding effect of mixed insulating oil on water molecules, and the increase of water content enhanced the ability of mixed insulating oil and water molecules to form hydrogen bonds. The final results showed that different natural ester content enhanced the thermal stability and insulation characteristics of the mixed insulating oil.
Research on Signal Processing in φ-OTDR System Based on Single Frequency IIR Trap
Authors: Yu Jinghua , Tian Tian 
Published: January 2021

Abstract
In the traditional phase sensitive optical time domain reflectometer (φ-OTDR) system, after locating of the vibration source, the spectrum diagram of the vibration signal can be obtained through the non-uniform Discrete Fourier Transform (NDFT) by extracting the data at this position. However, spectral aliasing noise included in the spectrum of the obtained vibration signal at this time. Because spectrum aliasing noise is generated in the process of NDFT transformation, traditional noise reduction methods have little effect on it. Therefore, this paper proposes a kind of IIR notch device based on single frequency for use in φ-OTDR. The change of standard deviation in discrete frequency domain is used to locate the vibration source, the large frequency components are filtered out from the time domain to solve the small signal components. The performance of IIR notch filter is verified by simulation. The results show that the notch filter can be used to calculate the small signal components of non-uniformly sampled signals successfully. It is convenient for φ-OTDR to use time-frequency images of different vibration types to identify vibration signals, so as to improve the recognition efficiency and monitoring ability of the system.
Robot-based incremental sheet forming – the tool path planning
Authors: Bârsan A , Popp M O , Rusu G P , Maroșan A I 
Published: January 2021

Abstract
To achieve a 3D shape with certain degree of complexity from metal sheets that are flat in the beginning, especially for prototype development or small series production, that is also cost efficient by avoiding high-end dies or expensive tooling, the incremental sheet forming process can represent the ideal choice due to its flexibility, reduced forming forces and increased formability. The process is performed with a round tool that follows a predefined path to deform the flat metal sheet into its final shape. The proper selection of the toolpaths affects the productivity and the accuracy of each part. The process having to focus on forming each single point in increments. For cost-effective production, the incremental sheet forming process is performed by an industrial robot. This paper aims to showcase the superior kinematic potential of the robot for complex tool paths by means of simulation. Singularity issues and robot joints limitation is checked through DELMIA software platform. After the design, simulation, and generation of the tool path, the software code can be generated and also used to steer the robot.
Using critical path method for a new project scheduling - the case of a new product launch in production
Authors: Blaga F S , Pop A , Hule V , Karczis A , Buzdugan D 
Published: January 2021

Abstract
The assimilation process must take place in the shortest possible time and with the lowest costs. These desires are achievable through the most efficient procedures. The paper proposes a procedure for managing the assimilation process of a new product, based on the critical path method. The procedure is intended for a company producing plastic products. In the first phase there was a critical analysis of the existing procedure for assimilating a new product. In the following the study presents how the activities carried out for the assimilation of a new product were organized into a project. To implement this project it was used the Microsoft Project software. This is a tool that allows project management to use the critical path method. By applying this method, it can identify the critical activities within the project. In order to minimize the execution time of the project, the execution time of the critical activities must be reduced. The duration of an activity can be reduced by allocating additional resources. Using the Microsoft Project software in the analyzed case, provides to decision makers information that allows them to make decisions that will reduce the duration of the assimilation process of a new product.
Fused deposition modelling process: a literature review
Authors: Blaj M , Oancea G 
Published: January 2021

Abstract
It is well-known that the Additive Manufacturing is a one of the key technology of the fourth industrial revolution, and Fused Deposition Modelling process is one of the most used processes with a large applicability in many domains. Based on a literature review, the paper aims to approach the topic of the main process parameters definitions which ensure the management over the printing process. The paper is also focused on the current optimized manufacturing process, presenting the latest approach from the design phase to the post processing step. Another subject is referring to the used materials, with an accent over the composite carbon filaments in the context of Fused Deposition Modelling process limitations. In order to sum up, based on the main directions and purposes of the further research, this paper aims to be a binder between the current knowledge and what will be studied regarding Fused Deposition Modelling process.
Some aspects regarding planetary precessional transmissions dynamics
Authors: Bostan I , Dulgheru V , Malcoci I 
Published: January 2021

Abstract
A mechanical system theoretically should not generate any vibrations and noise to be considered dynamically an ideal system, because vibrations mean a loss of energy. In planetary precessional reducers vibration can appear at bearings, gears, misaligned shafts, unbalanced rotors, couplings. Changes in dynamic process affects not only normal behaviors of mechanical systems but also the forces that act here. Regarding this aspects, regular vibration measurements during the operating speed provide information about any necessary repairs or maintenance. Here vibration research was made by using GUNT PT500 Machinery Diagnostic System and vibration signals was evaluated by using GUNT PT500.04 software which allow to perform correct Fast Fourier Transformation analysis. Data acquisition was made by using two piezoelectric accelerations sensor type IMI603C01 and one reference photoelectric sensor to record the shaft speed. Research concluded in this paper is made on precessional gearbox 2K-H Type. In first phase the crankshaft was installed with self-alignment on 2 radial bearings with cylindrical roller and second research phase was determination of the resonance domain and performing the spectral analysis by recording several vibrogram.
On-line linear guideway monitoring using laser mouse sensor
Authors: Cheng W N , Cheng C C , Tsai C M , Chang B C , Chen W R , Chiang T F 
Published: January 2021

Abstract
A low-cost, on-line linear guideway straightness monitoring system for machine tools is presented. The monitoring system which includes an embedded optical sensor from the optical mouse, an image display module, a displacement calculation module, an image enhancement module and a data visualization module are integrated into an edge computer. This proposed sensing system can measure the displacement in two orthogonal directions simultaneously, i.e. a two-dimensional displacement sensor based on digital image correlation, DIC. With image enhancement technique and a custom-made speckle patterns printed using a standard low-cost monochrome laser printer, results show that this two-dimensional displacement sensing system has a displacement resolution less than 5 µm in both orthogonal directions. The measuring range is 1mm for static measurement but is effectively infinite while moving at a low speed less than 0.05m/s. However, the accumulation error increases with the measuring range. A novel application of utilizing this displacement sensing system upon online monitoring the linear guideway healthy status, i.e. linear guideway straightness, of machine tools is presented. The performance and the associated advantages and disadvantages of this proposed sensor as well as the on-line monitoring system is assessed experimentally.
Automatic generation of documents and reports for educational process
Authors: Chivu C I , Chivu C 
Published: January 2021

Abstract
Management of educational process implies a large number of documents and reports that are interconnected and have high impact upon students and teachers. Coordinators of educational processes struggle with time management, correlation between implied parts and specific requirement. Present paper is focused on distance learning educational process that has specific requirement regarding students, teachers timetables and discipline management documents. Authors developed an informatic application that allows users to obtain: students’ and teachers’ timetables; reports regarding teachers from all study program; calendars of disciplines. Using this application, time invested in the process is reducing with almost 55%, proving the opportunity and efficiency of application.
Current perspectives on innovative methods used in teaching technical drawing
Authors: Clinciu M R , Clinciu R 
Published: January 2021

Abstract
This article emphasizes some innovative methods that can be used to improve the teaching of the basic concepts of technical drawing, for students of technical faculties. These methods stimulate both the learning process and personal development, ensuring the improvement and optimization of the educational process through the exchange of ideas and experiences. The innovative methods included in the case studies presented in this paper were applied in the teaching activities, at the subject technical drawing, and demonstrated both the motivation and implication of students, as well as the fact that effective results were gained by using these methods. The results of these case studies were reflected in the improved performance of students and can also be used to improve the quality of teaching and learning technical drawing.
The determination of the relation between the drill diameter and the correction coefficient of the relative thickness of the drill core when calculating the axial force
Authors: Daicu R , Diţu V 
Published: January 2021

Abstract
When drilling metals, the determination of the axial force is necessary for multiple applications. In the literature the algorithm for calculating the axial force is quite well presented but there is an exception, namely, the correction coefficient of the axial force in relation to the relative thickness of the drill core where several iterations are needed. To determine the relationship between the diameter of the drill and the correction coefficient of the axial force, we start from the expression of the axial force developed based on the hypothesis of polytropic compression of the material to be processed where the correction coefficients are applied when practical situations require it. From the methodology of calculating the correction coefficient in relation to the relative thickness of the drill core it is found that there are three stages. In this paper we eliminate two steps by determining the relationship between the diameter of the drill and the correction coefficient for the relative thickness of the drill core and also improves the calculation both by developing a relationship that can be easily applied and by building a graph that helps upon rapid identification of the correction coefficient.
Selecting an alternative to solve a problem from several available alternatives
Authors: Dodun O , Slătineanu L , Arcidiacono G , Coteaţă M , Nagîţ G , Hriţuc A 
Published: January 2021

Abstract
When for a certain design problem many alternative solutions could be susceptible to be used, a selection activity should be developed. If in the case of simple problems, the identification of an applicable alternative could be made very fast, in the case of the complex problems, the identification of the most convenient alternative could constitute itself a difficult problem. Over the years, simpler or more complex methods were found and applied to help the problem solver in finding the most convenient applicable alternative. The selection of a certain alternative when many such alternatives seem to exist could be made using the double input matrix method and the method of the pairwise comparison matrix and distinct evaluation criteria. The results of a applying the two selection methods in the case of necessity to establish a machining scheme for an electrical discharge machining process were presented in the paper.
Computer program for single sampling plans by variables with known lot standard deviation
Authors: Eftimie N 
Published: January 2021

Abstract
The paper presents a computer program that can be used at design and application of single sampling plans by variables when the standard deviation of the lot is known. The developed program may be applied for quality characteristics with one single or two specification limits. When the quality characteristics have two specification limits, the program determines if two separate plans with one specification limit may be applied for making the decision about the lot acceptance or rejection, and takes into account all the cases that may appear in this situation. The computer program calculates first the plan parameters and then, using the sample measurements, makes the decision about the lot acceptance or rejection. Besides the program presentation, the paper also presents several examples that cover all cases of its utilization.
Study of input parameters influence on the surface quality at laser processing of Hardox 400 steel
Authors: Girdu C C , Dragoi M V , Mileșan M , Mihail L A , Cirtina L , Radulescu C 
Published: January 2021

Abstract
The paper presents the result of the experimental research regarding the influence of the parameters of the laser cutting regime of the HARDOX 400 steel on the roughness of the processed surface. The study was carried on by means of experimental research, based on a plan developed according to the Taguchi method, a fractionated factorial one, applied for three input parameters: assistant gas pressure, laser power, and cutting speed, each having three levels. The statistical processing of the experimental data was performed by ANOM (analysis of means) and S/N indexes (signal to noise), according to Taguchi Method approach, validated by ANOVA (analysis of variation). Particularly, the paper analyses the combined influence of laser power and the pressure of the assistant gas on the roughness. The main conclusion is that among the two parameters, the most significant influence is that of the pressure of assistant gas.
Performance diagnosis of the drive unit for high speed motorized spindle based on hidden state mapping model
Authors: Jia Z W , Fan L T , Zhu C X , Si Z P , Liu J Z 
Published: January 2021

Abstract
As the key component of the motorized spindle system, the performance of drive unit will directly affect the processing quality of CNC machine tools. This paper proposed a performance diagnosis method of hidden state mapping model to prevent the motorized spindle from failure. The hidden state model was obtained by feature extraction of the parameter vectors identified from the dynamic responses to test input signals. The thresholds of performance degradation were determined by the hidden state to evaluate the performance of the drive unit in the motorized spindle system. The feasibility and effectiveness of the model can be verified by taking IGBT degradation failure as an example. The results showed that the model parameters extracted from different degradation degrees of IGBT devices can be mapped to hidden state characteristics and used for performance evaluation of the drive unit. The proposed hidden state mapping model can be used in the framework of monitoring the safety and reliability of the drive unit, and lay the foundation for the prognostic and health management of the motorized spindle system.
The heat treatment influence on microstructure and mechanical properties of TiAl6V4 parts manufactured by SLM
Authors: Lancea C , Zaharia S M , Pop M A , Buican G R 
Published: January 2021

Abstract
Nowadays titanium alloys are widely used for building various parts for the aeronautical or aerospace industries, in the energy field, petroleum industry, in medicine and recently in the automotive industry, the sporting goods industry, etc. In this paper is analysed the influence of the heat treatment on the microstructure and compressive strength of the TiAl6V4 alloy samples, having a Lattice structure. The analyses results indicate differences between the as-built samples and the heat-treated samples. In this regard, heat-treated samples have a much uniform and stabile structure, a micro-structure with fewer pores and better mechanical resistance to compression stress. These results confirm that the heat treatment favourably influences the microstructure of the samples, reduces the internal stress and their mechanical characteristics too.
Parameters setting of selective laser melting machine
Authors: Le D T , Chen S L 
Published: January 2021

Abstract
Additive Manufacturing or Selective Laser Melting, in particular, has been used in industries in a vast number of applications since the 1980s. It has become common in various manufacturing processes, ranging from car engines, ships, and building constructions. In Additive Manufacturing applications, getting better accuracy and surface roughness as the main criteria with time efficient are challenging tasks that requires understanding of the fundamental Selective Laser Melting process. This study will investigate the relationship of process parameters and system parameters in Scanner Head Control, experimentally. Following the given result of this work, the machine operators will be able to understand the root of systems dynamics, the effects of process parameters, and speed up the initial setting with time efficiency.
Experimental research on dynamic thermal performance of silicon nitride all-ceramic ball bearings
Authors: Li S H , Wang Y H , Wei C , Wang Z N , Xia Z X 
Published: January 2021

Abstract
In order to verify that the silicon nitride all-ceramic ball bearings have more excellent high-speed performance, thermal rise and vibration are the two main factors that restrict the bearing to move at high speed. In this manuscript, based on the establishment of the mechanical model of bearings, the structural model of all ceramic motorized spindle-bearings is established. The temperature field of the motorized spindle-bearing system is simulated through analysis of bearing heat generation. The thermal rise of silicon nitride all-ceramic ball bearings was tested by setting up all ceramic motorized spindle-bearing test platform under the operating speeds of 6,000, 9,000, 12,000, 15,000 and 18,000 rpm respectively, the results are compared with the simulation results. Vibration characteristics of the all-ceramic ball bearings were compared with those of similar steel bearings. The test results show that the thermal rise of all-ceramic ball bearings gradually tends to be stable at different rotational speeds after the running time exceeds 15 minutes, no-load thermal rise is less than 10°C, the maximum temperature of ceramic bearing is nearly 10 °C lower than the maximum temperature of the simulated metal bearing. With the increase of rotating speed, the maximum amplitude of metal bearing without loading is 2.38 times of that of ceramic bearing. The conclusion shows that ceramic bearings have better dynamic characteristics and stable reliability than metal bearings, so they have better high-speed performance, providing reference value for the future design of the same type of all-ceramic bearings.
Overall stability analysis of combined boom with telescopic main boom and fixed flying jib
Authors: Liu S M , Qin W L , Han X Q , Meng L X 
Published: January 2021

Abstract
On the purpose of accurately analyze the overall stability of the combined boom, and it also provides calculation basis for the structural design of the crane combined boom and the revision of the Chinese Design Rules for Cranes GB3811-2008. In order to analyse the overall stability of the combined boom accurately, the deflection differential equations of combined boom is established based on the vertical and horizontal bending theory. What’s more, combining the constraint and displacement boundary condition, the precise recursive expression of the buckling characteristic equations of the combined boom is derived. Taking the combined boom of 6-section telescopic main boom and fixed flying jib as an example, the proposed method and the ANSYS simulation method are used to calculate the critical bucking force of the combined boom, and the comparison results show that: the deduced instability characteristic equation of the combined boom is correct and accurate, which is necessary to the designing analysis in engineering.
CAD based design for the jewellery industry: A case study
Authors: Manavis A , Minaoglou P , Aidinli K , Efkolidis N , Kyratsis P 
Published: January 2021

Abstract
Jewel design is performed for many years and the designers and manufacturers follow a variety of inspirations. Traditionally the designs are generated based on the artistic sense of the creator, while at the same time a number of manufacturing restrictions apply. Nowadays, a series of advanced Computer Aided Design, CAD based tools are available in order to generate impressive concepts. Although, it is possible for designers to interface a CAD system and implement their design digitally, some prefer to use the programming capabilities offered by the CAD software developers. This is the way forward, in order to create unusual geometries for the jewellery industry and at the same time to develop the capability for generating a complete family of geometries that can satisfy even the most demanding customer. In the current paper, the latest approach is presented together with a case study.