bluuebunny/crossref_metadata_2025 huggingface dataset:
The Development of active capacitive voltage divider based on current transformer with compensation circuit
Authors: Shuai GAO , Shuo ZHANG , Zhanhe XU , Lin ZHAO , Xiaokun YANG
Published: January 2021

In order to solve the test of the frequency response characteristics of the DC voltage divider, this paper proposed an active voltage divider based on an electronically compensated current transformer. By setting different current transformer primary and secondary turns ratios, the voltage divider ratio could be changed. Through the three-winding design on a single iron core, the active compensation of the current transformer is realized and the linearity of the current transformer is improved obviously. The notch circuit is used to improve the measurement accuracy of the secondary current sampling circuit of the current transformer. Tests indicates that the voltage divider ratio varies with frequency not more than 20ppm, and phase shift is not more than 200μrad within 2500Hz.
Research on Wheelchair Design for the Disabled Elderly Based on QFD/TRIZ
Authors: Xi Zeng , Meng-di Yi
Published: January 2021

Objective This research proposes a wheelchair design method for the elderly with disabilities based on the combination of QFD theory and TRIZ theory to improve the satisfaction of the needs of elderly users and the feasibility of implementing related product technologies. Methods Starting from the needs of disabled elderly people, this research analyzes the shortcomings of QFD theory and TRIZ theory, and builds a framework model that combines TRIZ and QFD theory. Conclusion Through the redesign of the wheelchair, the various problems encountered by the disabled elderly in the process of using the wheelchair are solved, and their needs in the wheelchair are met. At the same time, through the analysis of the design process and results, the QFD/TRIZ integrated model is proposed and verified The feasibility of functional product design that can be applied to disabled elderly people.
Research on fault warning of marine diesel engine cooling system based on Deep Belief Network
Authors: Yao Qian , Liu Yunsheng , Guo Chaoyou , Ao Chenyang , Guan Tao , Xu Zhe
Published: January 2021

With the development of artificial intelligence and big data technology, deep learning has been applied to fault warning and diagnosis. In this paper, the typical failure modes of marine diesel engine cooling system are analyzed, and the characteristic parameters are selected. The fault warning model is established based on the deep belief neural network (DBN). The training and testing of the model are carried out by using the experiment data of a marine diesel engine. The results show that the deep belief neural network can effectively realize the fault warning of marine diesel engine cooling system.
Transformer fault diagnosis based on Improved Particle Swarm Optimization to support Vector Machine
Authors: Wu Yuhan , Sun Xianbo , Yang Pengfei , Wang Zhihao
Published: January 2021

Power transformer fault diagnosis exerts a vital part in the safe operation of power system. The PSO-SVM based on transformer fault diagnosis still has some shortcomings, such as slow convergence speed and easy to fall into local optimization. This dissertation proposes a transformer diagnosis method based on Improve Particle Swarm Optimization to support Vector Machine (MPSO-SVM). Adding disturbance to Particle swarm optimization (PSO) to disturb the position of such precocious particles, so as to get rid of local optimum. The case analysis represents that the diagnostic accuracy of MPSO-SVM is higher than that of PSO-SVM and Generalized Regression Neural Network (GRNN), and MPSO-SVM can effectively promote the fault diagnosis performance of transformer.
Research on Communication Module of Communication or Automation Equipment
Authors: Yang Yi , Fu Yingfeng
Published: January 2021

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Computational design technologies for interior designers: a case study
Authors: Manavis A , Minaoglou P , Tzetzis D , Efkolidis N , Kyratsis P
Published: January 2021

Traditionally interior design is based on the inspiration generated by the designer who acts as an artist and engineer at the same time. Today, a number of digitally developed forms can be used with an aim to offer unusual geometries. Computational design technologies can be used in order to fully automate the generation of a design based on a series of parameters that can be altered within specific limits. In such a way, families of forms and proposals are made available and more opportunities for products dealing with interior design can be produced. These forms require the use of modern 3D printing technologies for their construction due to their geometrical complexity and their digital development. In the present paper, computational design will be presented together with a case study in the area of interior design.
Progressive screw shaft manufacturing technology
Authors: Matejic M , Dragoi M V , Blagojevic M , Filip A C , Miletic I
Published: January 2021

The progressive screw shaft is one of the very challenging part for machining. It might have a decisive influence on the precision of the parts processed by the machine tool. In this paper is presented a new, innovative technology of its manufacturing. The first goal is to develop a technological process for CNC milling machine. Technological process is fully described and with all parameters given and commented. Technology for progressive screw shaft manufacturing is developed in Autodesk Inventor HSM software. The second goal of the paper is a comparative analysis of the here described process for milling the different profile shapes. In the paper are given the milling examples of rectangular and circular profiles. Paper aims to emphasize the advantages and disadvantages of the proposed method. Some conclusions and directions to next research steps are given at the end of the paper.
Optimization of industrial management processes
Authors: Mărgineanu C , Lixăndroiu D
Published: January 2021

The paper aims to present a technique for optimizing industrial management processes by mathematical modeling using linear inequality systems. An issue facing an industrial enterprise regarding production costs will be presented and solved, after which the results will be interpreted to formulate the optimal solution. The main phases of solving a problem with the help of linear programming are presented as well as the detailed analysis of the obtained results. The reduction of costs due to the processes presented in the analysis is presented alternatively with the existing costs and the paper details how to save 336 euros per day, as well as an increase in profit by 1935 euros. At the same time, the paper aims to present a software product to support economic decision modeling with which to perform calculations and present the optimal decision.
Influence of DC05 deep drawing steel real material properties on numerical simulation of incremental forming process
Authors: Nasulea D , Oancea G
Published: January 2021

The finite element method is one of the most useful virtual tools in industrial engineering, which allows quick and cheap predictions and verifications. As it is expected, the FEM simulations are also integrated for incremental forming processes to anticipate different aspects as forming forces, the material stress and strain, dimensional accuracy of parts, or simply to check if the desired part can be manufactured without material failure, before to start the effective manufacturing. The FEM predictions validity is influenced by many aspects of which the most significant are the sheet metal blank material properties. Each sheet blank material has its own mechanical properties, according with material standards, considered to be the theoretical properties. In most of the situations, those theoretical material properties are not matched with the real material properties. In this paper, it is presented the experimental method of determination of the real material properties for DC05 deep drawing steel, based on the tensile strength of the sheet specimens, and the true stress-strain curve which, in fact, represents the real material characteristic curve. A comparison is made between the FEM results, obtained using both, the theoretical and the determined real material properties, and the experimental trials for parts with frustum of a cone shapes.
Designing of an original extruding system for 3D printing of parts made of plastic material in powder-state form
Authors: Păcurar R , Pascu S , Păcurar A , Stan D S , Teuţan E , Băilă D I , Sadeh A
Published: January 2021

Since their advent, various 3D printing technologies have been developed, out of which the Fused Filament Fabrication, FFF has completely revolutionized the industry in the last years. Classical FFF printers are using a thermoplastic filament, which is heated to its melting point and then extruded layer by layer to materialize a three dimensional part. One of the most important subassemblies of the 3D printer which is the most representative is the extrusion sub-assembly system and the thermal demands to which is subjected. In this article, one original constructive variant of the extruding sub-assembly system has been conceived and thermal analyses of the variant was performed by using the finite element method so as to be used not only for printing parts made of plastic materials in filament form, but also plastic materials in the powder state form at the Technical University of Cluj-Napoca, Romania.
Sustainable manufacturing systems – a simulation model
Authors: Parv A L , Deaky B A , Stasiak-Betlejewska R
Published: January 2021

Connecting companies to the paradigm of climate change leads to the creation of sustainable production systems. In this context, new approaches to processes allow the definition of sustainable manufacturing systems. The sustainability of manufacturing systems is an important aspect in order to insure the competitive power of enterprises. In this respect, the manufacturing systems must take into account economic factors, environmental concerns and social directions. Decisions regarding manufacturing development, optimization, or reorganization are driven by many factors and are often costly, with the benefits hard to justify before implementation. This paper describes an agent-based model simulation that analyses the behaviour of a sustainable manufacturing system.
Studies on structural MWCNT/epoxy nanocomposites for EMI shielding applications
Authors: Paun C , Obreja C , Comanescu F , Tucureanu V , Tutunaru O , Romanitan C , Ionescu O , Gavrila D E , Paltanea V Manescu , Stoica V , Paltanea G
Published: January 2021

This paper presents the preparation and characterization of MWCNT - Multi-Walled Carbon Nano-Tube/epoxy nanocomposites, as materials with a good yield for shielding electromagnetic interferences - EMI. Both the precursors used, and the nanocomposites obtained were characterized by different techniques: FTIR - Fourier transform infrared spectroscopy, Raman spectroscopy, SEM - Scanning Electron Microscope and XRD - X-ray diffraction. The electrical and mechanical properties of the nanocomposites were estimated compared to the epoxy resin without addition. Electromagnetic interference shielding tests were conducted in the 2.5 - 6.4 GHz frequency band. The results were found to be promising since for the MWCNT/epoxy sample it was obtained a 20 dB attenuation when compared with the ambient air.
Influence of process parameters on the AWJ cutting of the AL-EN AW 2017A (T4) aluminium alloy
Authors: Radu M C , Schnakovszky C , Chirita B A , Tampu N C , Ciubotariu V A , Herghelegiu E
Published: January 2021

Abrasive water jet machining is an emerging non-conventional technology widely used in different industrial sectors due to its multiple economic and environmental benefits. The quality of processed surface depends on process parameters, abrasive material properties and processed material properties and is mainly expressed by surface roughness, shape and dimensional accuracy of cut, presence of striations and/or burr. The current paper aims to present the influence of water jet pressure and traverse speed on the quality of processed surfaces in the case of AL-EN AW 2017A - T4 aluminium alloy abrasive water jet cutting.
Analysis of scheduling activities in the processes of improving surface characteristics of parts
Authors: Roșu M M , Vlădăreanu L , Iliescu M
Published: January 2021

In the framework of planning and scheduling process for improving surface characteristics the laser cladding process is one of the best solutions, due to the fact that it involves deposition of high-quality material layers by laser radiation. This process is efficient whenever there is the need of improving the surface characteristics of metallic parts, component of products that usually require high cost maintenance because of their severe wear while functioning. This paper presents a time- efficiency analysis of two types of surface properties improving techniques. One is laser cladding and the other is thermal spraying and there are envisaged the work in process time and the availability of capacity in each of the required manufacturing systems. In addition to the efficiency obtained by scheduling activities, the laser cladding process with nano powders ensures a reduction in the use of expensive materials, about 80% compared to traditionally manufacturing, higher productivity and lower energy consumption, about 20% reduction, compared to metallizing. So, compared to various existing solutions, laser nano-cladding technologies are versatile and applicable to various industrial sectors as energy, automotive, mining, food, etc.
Comparison between aluminum alloys behavior in incremental sheet metal forming process of frustum pyramid shaped parts
Authors: Rusu G P , Bârsan A , Popp M O , Maroșan A
Published: January 2021

Single point incremental forming is a new emerging technology, used mainly for prototype development or small series production, with good prospects in industrial implementation. However, the parts manufactured through this process often presents low accuracy, thus the industrial implementation is yet limited. Incremental forming process can be done with the help of different technological equipment, such as industrial robots and numerically controlled machines. Since the process is still in development phase, it is a good practice to use finite element analysis software packages in order to reduce time and costs to produce accurate parts. The aim of this paper is to investigate the behavior of different aluminum alloys deformed through SPIF regarding forming forces, thickness distribution and springback effect. Based on numerical simulations performed, the material which produces the most accurate parts for the frustum cone can be chosen for further experimental research.
Robotized application of assembly and soldering – case study
Authors: Staretu I
Published: January 2021

Robotic assembly is increasingly encountered in various technological processes. This can also be followed by robotic operations such as soldering some components. This paper presents the robotics of two operations to which an electric contactor is subjected. The first operation is the robotic fitting of a rubber bandage. The second robotic operation is the soldering of two electrical contacts. For the transfer of the pieces, a poly-gripper is used and it consists of six grippers with jaws, each of which grasp an electric contactor. This solution was chosen due to the large number of contactors to increase the productivity of the process. The technical projects and 3D models of the gripper and the poly-gripper are shown. For each robotic operation, the structure of the robotic cell is presented and the simulation of the transfer operations of the electrical contactors from the initial positions to the workstations and then to the storage places points of view is shown too.
Stress and vibration analysis of a drone
Authors: Urdea M
Published: January 2021

This paper refers to drones. The development of drones has been extremely fast in the last few years. They can be used in many different areas of military or of civil life, for industrial and agricultural purposes. In some fields this unmanned aerial vehicles may open up new horizons. These vehicles can solve a range of problems, in law enforcement contexts. Their two basic functions are flight and navigation. The purpose of this paper is to present this device, to develop a CAD model of it using SolidWorks and to perform FE analysis study. The drone frame was simulated and analysed in various conditions such as lift and vibration.
Static and dynamic characteristics analysis of self-balancing motorized spindle
Authors: Wang Z , He W Z , Zhou H M , Du S Y
Published: January 2021

In order to effectively suppress the vibration of motorized spindle caused by unbalance fault, realize online dynamic balance control of motorized spindle unit. A self-balancing motorized spindle with dynamic balancing device is designed and the finite element analysis of self-balancing motorized spindle is carried out. The static analysis is carried out, and the static deformation diagram of spindle is obtained after constraint and load are applied. Then modal analysis and harmonic response analysis are carried out, and the first six natural frequencies, mode shapes and displacement frequency curves of spindle are obtained. The results show that: The deformation of motorized spindle is small and rigidity of spindle meets design requirements: Within the working speed range, the spindle will not resonate and work stably and reliably. The rationality and reliability of structure design of self-balancing motorized spindle are verified.
Study on vibration characteristics of motorized spindle based on multi-physics fields
Authors: Zhang K , Wang Z N , Wang Z , Wang Q Y , Ma J
Published: January 2021

Ceramic motorized spindle plays an important role on CNC machine tool. Its dynamic characteristic determines the machining quality of spindle. This paper established a dynamics model of ceramic bearing, and explored the relationship of bearing stiffness and vibration response. The temperature field model of ceramic motorized spindle was established to analyze the temperature field. The motorized spindle air gap influence on unbalanced magnetic pull was studied. The dynamic model of ceramic motorized spindle was established through considering the multiple physical fields influence factors, the changing law of dynamic characteristics was studied. It has been verified by experiments. The average error of ceramic spindle decreased from 5.1% to 2.1%. The establishment of multi-fields dynamic model provided an important guidance for spindle design.
Characteristics of wall heat transfer from impinging diesel spray flame in low oxygen concentration ambient
Authors: Mahmud R , Nishida K , Ogata Y , Kurisu T
Published: January 2021

The objective of this study is to obtain an enhanced understanding of the effect of diesel spray/flame impingement on transient heat flux to the wall. By using a constant volume vessel under engine-like condition, surface heat flux of the wall at spray/flame impingement was measured with three thin film thermocouple heat flux sensors. Fuel was injected using a single-hole injector with a 0.133 mm diameter nozzle. In order to investigate the relation between diesel flame and wall heat loss, two color-method was applied to observe flame temperature distribution. 21 % and 16 % as the various oxygen concentration were investigated at each injection pressure of pressure 80, 120, and 180 MPa. The results showed that the lower oxygen concentration was generated heat loss regardless of injection pressures. The lower flame temperature and flame contact area and period were influence factor on heat loss on the wall. Furthermore, the relation between Nusselt number (Nu) and Reynolds number (Re) were also investigated to understand the heat transfer phenomena in diesel engines.
Possibility of geothermal offshore in Sangihe archipelago, northern part of Sulawesi, Indonesia
Authors: Widiatmoko F R , Dewangga D D , Gustriandy A , Salsabila S , Anggraeni N , Infithor M , Hanifah D , Pratama R A , Kusaeri T H , Zamroni A
Published: January 2021

Mostly geothermal power plant placed around volcano on land. Sangihe Archipelago, the northern of Sulawesi Island known as volcano arc that formed by the subduction of Philippines plate beneath Micro-Sunda plate. The geothermal source is located under sea level, this condition needs some approach of remotely applied sciences. The possibility study is conducted by bathymetry, gravity, magnetic, and regional geology. The objective is searching the high value gravity at the high topography as indication of the magmatic product on the seafloor and the low value of magnetic as indication of the active heat resources. A profile section from Philippines oceanic plate to the Celebes Sea by using each data shown a sequence of subduction product, such as trench, outer-arc ridge, and volcano arc. Geological data is used to know the evidence volcano arc and outer-arc ridge. The volcano arc shows that the age is around Quarter which means it is possible for geothermal resources, the outer-arc ridge shows that the rock contents were melange complex and ultramafic rocks. Sangihe area has possibility for further research as geothermal offshores.
Simplified gasification simulation using zero-dimensional model of empty palm fruit bunch
Authors: Nugroho P N A , Torii S
Published: January 2021

As one of the most efficient biomass conversions, the gasification process is hard to understand because of its complexity. A simplified gasification process simulation using a zero-dimensional model was designed for an empty fruit bunch considering its potential in Indonesia. A stoichiometric equilibrium model was applied to simulate the whole gasification process. Global gasification reaction, mass, and energy balance with two independent chemical reactions are integrated to perform the model. Some sets of linear and nonlinear equations were solved with the Newton Raphson method in Matlab. The output of the model, like syngas composition and the heating value, was validated with available experimental data published. The zero-dimensional thermodynamic equilibrium model could be used to predict the maximum performance of the gasifier and make the gasification process more feasible.
ERP compatibility on business performance through the inventory system and internal integration
Authors: Sebayang P , Tarigan Z J H , Panjaitan T W S
Published: January 2021

The information technology used by companies today is ERP (Enterprise Resources Planning) technology. This study aims to examine the role of ERP compatibility in improving the performance of MM-2100 manufacturing companies. Data is collected at manufacturing companies that have made ERP system adjustments. Data collection was carried out through questionnaires distributed to manufacturing companies, and as many as 78 questionnaires were obtained, which could be further processed. Retrieval of data using questionnaires submitted to the relevant section that has access to company inventory data. Data analysis was performed using the SEM-PLS technique using smart PLS software version 2.0. The results of the study show that ERP compatibility can increase internal information integration and inventory system continuously. However, ERP compatibility has no direct effect on manufacturing performance. Internal integration affects inventory systems and manufacturing performance with coefficients of 0.346 and 0.378, respectively. Internal integration allows other functions to be able to access inventory in the company. The company’s inventory system that is controlled can perform efficiency and effectiveness for the company so that it has an impact on manufacturing performance with a coefficient of 0.766.
Information system planning process design based on clause 8 iso 20000-1:2018 using sysml language
Authors: Aurachman R , Sudianto Y , Utomo N S
Published: January 2021

information systems have become inseparable from current products and services. Improving information systems will add value to the quality of products and services. Some references can be used to produce a good information system. One reference that can be used is ISO 20000-1: 2018. Because of the new standards, there are not many studies that guide the implementation. This paper aims to contribute in providing references for application in aspects of information system planning based on clause 8 ISO 20000-1: 2018. The modelling process uses SysML modelling language. We find the guidance to implementation of this standard and the example of Model Based System Engineering using Block Definition Diagram.