Facta Universitatis-Series Mechanical Engineering最新文献_第3页

IDENTIFICATION OF CHATTER VIBRATIONS AND ACTIVE VIBRATION CONTROL BY USING THE SLIDING MODE CONTROLLER ON DRY TURNING OF TITANIUM ALLOY (TI6AL4V) 钛合金(ti6al4v)干车削颤振辨识及滑模主动控制

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-08-10 DOI: 10.22190/fume210728067g

M. Guvenc, H. H. Bilgic, S. Mistikoglu

{"title":"IDENTIFICATION OF CHATTER VIBRATIONS AND ACTIVE VIBRATION CONTROL BY USING THE SLIDING MODE CONTROLLER ON DRY TURNING OF TITANIUM ALLOY (TI6AL4V)","authors":"M. Guvenc, H. H. Bilgic, S. Mistikoglu","doi":"10.22190/fume210728067g","DOIUrl":"https://doi.org/10.22190/fume210728067g","url":null,"abstract":"In recent years, with the development of sensor technologies, communication platforms, cyber-physical systems, storage technologies, internet applications and controller infrastructures, the way has been opened to produce competitive products with high quality and low cost. In turning, which is one of the important processes of machining, chatter vibrations are among the biggest problems affecting product quality, productivity and cost. There are many techniques proposed to reduce chatter vibrations for which the exact cause cannot be determined. In this study, an active vibration control based on the Sliding Mode Control (SMC) has been implemented in order to reduce and eliminate chatter vibration, which is undesirable for the turning process. In this context, three-axis acceleration data were collected from the cutting tool during the turning of Ti6Al4V. Finite Impulse Response (FIR) filtering, Fast Fourier Transform (FFT) analysis and integral process were carried out in order to use the raw acceleration data collected over the system in control. The system is modeled mathematically and an active control block diagram is created. It is observed that chattering decreased significantly after the application of active vibration control. The surface quality formed by the amplitude of the graph obtained after active control has been compared and verified with the data obtained from the actual manufacturing result.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"130 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80425091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

FRACTURE PARAMETERS EVALUATION FOR THE CRACKED NONHOMOGENEOUS ENAMEL BASED ON THE FINITE ELEMENT METHOD AND VIRTUAL CRACK CLOSURE TECHNIQUE 基于有限元法和虚拟裂纹闭合技术的非均匀牙釉质裂纹断裂参数评估

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-08-10 DOI: 10.22190/fume210619072c

Y. Cai, Liming Zhou, Ming Li

{"title":"FRACTURE PARAMETERS EVALUATION FOR THE CRACKED NONHOMOGENEOUS ENAMEL BASED ON THE FINITE ELEMENT METHOD AND VIRTUAL CRACK CLOSURE TECHNIQUE","authors":"Y. Cai, Liming Zhou, Ming Li","doi":"10.22190/fume210619072c","DOIUrl":"https://doi.org/10.22190/fume210619072c","url":null,"abstract":"To accurately solve the fracture parameters of enamel, we have established computational nonhomogeneous enamel models and constructed the fracture element of enamel dumb nodes, based on the enamel mineral concentration, nonhomogeneous mechanical properties, and virtual crack closure technique. Through the commercial finite element software ABAQUS and the fracture element of the enamel dumb nodes, we have established the user subroutines UMAT and UEL, which enabled solving of the energy release rates of the nonhomogeneous enamel structure with cracks. The stress intensity factors of central cracks, three-point bend and compact stretched enamels, and double-edge notched stretched enamels are determined. By comparing them with analytical solutions, we have proved that the fracture element of the enamel dumb nodes is highly accurate, simple, and convenient. In addition, the cracks can be other elements rather than singular or special elements; they show versatility and other advantages. The stress intensity factor of the dental enamel can be solved more realistically. Thus, a new numerical method for prevention and treatment of dental diseases is provided.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"52 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81644167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

PULL-DOWN INSTABILITY OF THE QUADRATIC NONLINEAR OSCILLATORS 二次型非线性振子的下拉不稳定性

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-08-10 DOI: 10.22190/fume230114007h

Ji-Huan He, Qian Yang, Chun-Hui He, Abdulrahman Alsolami

引用次数: 7

NONLINEAR VIBRATION RESPONSE OF PIEZOELECTRIC NANOSENSOR: INFLUENCES OF SURFACE/INTERFACE EFFECTS 压电纳米传感器的非线性振动响应:表面/界面效应的影响

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-08-10 DOI: 10.22190/fume210612064k

Sayyid H. Hashemi Kachapi

引用次数: 3

DESIGN AND OPTIMIZATION OF THE VARIABLE-DENSITY LATTICE STRUCTURE BASED ON LOAD PATHS 基于载荷路径的变密度点阵结构设计与优化

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-08-10 DOI: 10.22190/fume220108017w

Fenghe Wu, H. Lian, Guobin Pei, Baosu Guo, Zhaohua Wang

{"title":"DESIGN AND OPTIMIZATION OF THE VARIABLE-DENSITY LATTICE STRUCTURE BASED ON LOAD PATHS","authors":"Fenghe Wu, H. Lian, Guobin Pei, Baosu Guo, Zhaohua Wang","doi":"10.22190/fume220108017w","DOIUrl":"https://doi.org/10.22190/fume220108017w","url":null,"abstract":"Lattice structure is more and more widely used in engineering by replacing solid structure. But its mechanical performances are constrained by the external shape if the unit cells are directly filled in the design domain, and the traditional topology optimization methods are difficult to give the explicitly mechanical guidance for the distribution of internal unit cells. In this paper, a novel design and optimization method of variable-density lattice structure is proposed in order to simultaneously optimize the external shape and the internal unit cells. First of all, the envelope model of any given structure should be established, and the load paths need to be visualized by the theory of load path. Then, the design criteria of external shape are established based on the principle of smoother load paths in the structure. An index of load flow capacity is defined to indicate the load paths density and to control the density distribution of unit cells, and a detailed optimization strategy is given. Finally, three examples of a cantilever plate, an L-shaped bracket and a classical three-point bending beam are used to verify the method. The results show that the models designed by the proposed method have better mechanical performances, lower material usage and less printing time.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"7 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78831799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AN INVESTIGATION ON MEAN ROUGHNESS DEPTH AND MATERIAL EROSION SPEED DURING MANUFACTURING OF STAINLESS-STEEL MINIATURE RATCHET GEARS BY WIRE-EDM 不锈钢微型棘轮电火花加工过程中平均粗糙度深度和材料侵蚀速度的研究

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-08-10 DOI: 10.22190/fume221220012c

S. K. Chaubey, K. Gupta, M. Madić

{"title":"AN INVESTIGATION ON MEAN ROUGHNESS DEPTH AND MATERIAL EROSION SPEED DURING MANUFACTURING OF STAINLESS-STEEL MINIATURE RATCHET GEARS BY WIRE-EDM","authors":"S. K. Chaubey, K. Gupta, M. Madić","doi":"10.22190/fume221220012c","DOIUrl":"https://doi.org/10.22190/fume221220012c","url":null,"abstract":"This paper presents the results of an investigation conducted on wire electric discharge machining (wire-EDM) of miniature ratchet gears. Effects of three important process parameters spark duration, ‘Ton’, spark-off-duration ‘Toff’, and wire tension ‘WT’ on surface quality, i.e., mean roughness depth ‘Rz’ and productivity, i.e., material erosion speed ‘MES’, have been investigated by conducting seventeen experimental trials. Both Ton and Toff have been identified as the significant parameters. Further, an optimization of wire-EDM parameters resulted in simultaneously best compromise values of Rz 5.30 µm and MES 6.75 mm/min and is achieved the following cutting regime: Ton 1.5 µs, Toff 42.5 µs, and WT 1500 g. At the end, surface quality study has been conducted to evaluate the tribological fitness of the miniature ratchet gear machined at optimum combination of wire-EDM parameter values. It was investigated that the generation of uniform and shallow craters on the flank surfaces of ratchet gear machined at optimum values of parameters, imparted smoother bearing area curve and lower coefficient of friction. The profile and flank surface of the ratchet gear also found free from cracks, burrs, and dirt.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"70 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86188545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RESEARCH ON THE FLUID-INDUCED EXCITATION CHARACTERISTICS OF THE CENTRIFUGAL PUMP CONSIDERING THE COMPOUND WHIRL EFFECT 考虑复合旋转效应的离心泵流体激振特性研究

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-08-10 DOI: 10.22190/fume210528065z

Wenhao Zhou, Dongliang Yu, Yifan Wang, Junlin Shi, B. Gan

{"title":"RESEARCH ON THE FLUID-INDUCED EXCITATION CHARACTERISTICS OF THE CENTRIFUGAL PUMP CONSIDERING THE COMPOUND WHIRL EFFECT","authors":"Wenhao Zhou, Dongliang Yu, Yifan Wang, Junlin Shi, B. Gan","doi":"10.22190/fume210528065z","DOIUrl":"https://doi.org/10.22190/fume210528065z","url":null,"abstract":"In order to study the correlation mechanism between the flow characteristics and the fluid-induced force under the compound whirl motion in the centrifugal pump, the RNG k-ε model is selected in this paper to simulate a low specific speed centrifugal pump with impeller eccentricity based on the N-S equation. The changes of fluid-induced force with impeller eccentricity and the unsteady flow characteristics of the internal flow field of centrifugal pump under different flow conditions and rotation speeds are investigated, and the relationship between the fluid-induced force of the impeller and the internal flow field characteristics is discussed. The results show that the trend of fluid-induced force and the pressure coefficient is similar. When the rotation speed changes and when the flow is similar, the pressure coefficient under different rotation speeds almost coincides. With the increase of impeller speed and impeller eccentricity, the dynamic and static interferences between the impeller and the volute tongue are more significant, the uneven distribution of the pressure around the impeller makes the internal flow of centrifugal pump more disordered and increases the fluid-induced force near the volute tongue. The research results can provide important reference value for accurately grasping the internal flow excitation principle of the centrifugal pump.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"351 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80033657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

THE INFLUENCE OF DANCE CONTENTS ON THE PRESCHOOLERS MOTOR FITNESS AND THEIR POSSIBLE APPLICATION IN PRESCHOOL INSTITUTIONS CURRICULUM 舞蹈内容对学龄前儿童运动健身的影响及其在学前机构课程中的应用

2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-08-07 DOI: 10.22190/futlte230531031d

Nenad Đorđević, Predrag Stojković, Romina Herodek, Xhelal Mustafa, Slavoljub Uzunović

{"title":"THE INFLUENCE OF DANCE CONTENTS ON THE PRESCHOOLERS MOTOR FITNESS AND THEIR POSSIBLE APPLICATION IN PRESCHOOL INSTITUTIONS CURRICULUM","authors":"Nenad Đorđević, Predrag Stojković, Romina Herodek, Xhelal Mustafa, Slavoljub Uzunović","doi":"10.22190/futlte230531031d","DOIUrl":"https://doi.org/10.22190/futlte230531031d","url":null,"abstract":"This paper presents a research focused on dance contents, specific dance programs and preschool children motor fitness. The main goal of this paper was to collect and analyze studies that as an experimental treatment had the contents of dance activities and their impact on the preschool children motor fitness. The necessary literature and papers were collected through the following databases: Google Scholar, PubMed, SCI index and the available professional literature at the Faculty of Sport and Physical Education in Niš, as well as other available literature. The following keywords were used: influence, effects, preschool age, preschoolers, exercise, dance, dance activities, motor skills, motor skills and their adequate translation into English. Twelve papers that met the set criteria were selected for the final analysis. The following conclusion was drawn: there is a positive impact of dance contents on the preschool children motor fitness, therefore, they can be recommended for use as the adequate contents of the PE curricula in preschool institutions.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135999472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DESIGN OF FIRST ORDER DIFFERENTIATOR WITH PARALLEL ALL-PASS STRUCTURE 一阶并联全通结构微分器的设计

2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-07-29 DOI: 10.22190/fuacr230324004s

Goran Stančić, Ivan Krstić, Saša S. Nikolić, Ivana Kostić

引用次数: 0

TWO-PARTITION DISCRETE GLOBAL GRID SYSTEMS - A COMPARISON OF APPROACHES BASED ON ADJUSTED SPHERICAL CUBE AND CYLINDRICAL EQUIDISTANT PROJECTION 两分区离散全局网格系统——基于调整球立方和圆柱等距投影的方法比较

2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2023-07-29 DOI: 10.22190/fuacr230322002d

Aleksandar Dimitrijević

引用次数: 0