Facta Universitatis-Series Mechanical Engineering最新文献_第9页

RELATION OF KINEMATICS AND CONTACT FORCES IN THREE-BODY SYSTEMS WITH A LIMITED NUMBER OF PARTICLES 有限粒子数三体系统的运动学与接触力关系

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-04-08 DOI: 10.22190/fume210310035p

Kristin M. de Payrebrune

{"title":"RELATION OF KINEMATICS AND CONTACT FORCES IN THREE-BODY SYSTEMS WITH A LIMITED NUMBER OF PARTICLES","authors":"Kristin M. de Payrebrune","doi":"10.22190/fume210310035p","DOIUrl":"https://doi.org/10.22190/fume210310035p","url":null,"abstract":"In many tribological systems, an intermediate layer of a limited number of abrasive particles exist. Thereby, the resulting wear and friction phenomena are desirable in many manufacturing processes, such as lapping or polishing, whereas in machine elements, they are unwanted due to reducing lifetime or performance.For a better understanding of the contact phenomena and the interaction of tribological systems with an intermediate layer of a limited number of particles, fundamental investigations are carried out on a tribometer test rig. For this purpose, two test scenarios are investigated, a) the kinematics and contact forces of single geometrically defined particles such as dodecahedron, icosahedron and hexahedron, and b) the contact forces and surface roughness of a layer of silicon carbide particles of different sizes.The measured ratio of tangential to normal force can be used as an indicator of the dominating kinematics of the particles and of the generated surface roughness, respectively. The higher the force ratio, the higher the tendency to slide for a given particle type and paring of particle and counter body.For one geometrically defined particle the short-time Fourier transform additionally helps to distinguish the state of motion since the excited frequencies during rolling are reduced. For a layer of silicon carbide particles, the velocity and particle size have the strongest influence on the overall motion and the surface roughness produced. Larger particles tend to slide and create more scratches, while smaller particles tend to roll and create indentations in the counter body. Furthermore, for the same particle size, an increase in velocity causes a transition from sliding to rolling, resulting in an increased surface roughness.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"5 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84052118","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: 4

RECENT IMPROVEMENTS OF THE OPTICAL AND THERMAL PERFORMANCE OF THE PARABOLIC TROUGH SOLAR COLLECTOR SYSTEMS 抛物槽太阳能集热器系统光学和热性能的最新改进

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-04-08 DOI: 10.22190/fume201106030a

A. Y. Al-Rabeeah, I. Seres, I. Farkas

{"title":"RECENT IMPROVEMENTS OF THE OPTICAL AND THERMAL PERFORMANCE OF THE PARABOLIC TROUGH SOLAR COLLECTOR SYSTEMS","authors":"A. Y. Al-Rabeeah, I. Seres, I. Farkas","doi":"10.22190/fume201106030a","DOIUrl":"https://doi.org/10.22190/fume201106030a","url":null,"abstract":"Parabolic trough solar collectors (PTSCs) are commonly used for applications that reach a temperature of up to 500 °C. Recently, improving the efficiency of PTSCs has been the focus of research because PTSCs have advantages, such as cost and size reduction and improved optical and thermal performance. This study summarizes relevant published research on the preparation, properties and experimental behavior of the optical and thermal properties of PTSCs. Analyzing of the thermal modeling method presents a steady and transient heat transfer analysis. Optical efficiency depends on material properties, such as mirror reflectance, glass cover transmittance, receiver absorption–emission, intercept factor, geometry factor and incidence angle. Also analyzed and discussed are the models used in computational fluid dynamics to study the physical properties of PTSCs. Lastly, studies on PTSC performance and enhancement, including novel designs, enhancement of passive heat transfer and laden flows of nanoparticles inside the absorber tube, are presented and examined separately. Nanofluids have illustrated their advantages and ability to increase heat transfer rates. Moreover, other works that aimed to enhance the optical and thermal efficiency of PTSCs are evaluated.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"69 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84752544","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: 12

IMPACT OF THE NUMBER OF VEHICLES ON TRAFFIC SAFETY: MULTIPHASE MODELING 车辆数量对交通安全的影响:多相建模

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-04-08 DOI: 10.22190/fume220215012d

M. Damjanović, Željko Stević, D. Stanimirović, I. Tanackov, D. Marinković

{"title":"IMPACT OF THE NUMBER OF VEHICLES ON TRAFFIC SAFETY: MULTIPHASE MODELING","authors":"M. Damjanović, Željko Stević, D. Stanimirović, I. Tanackov, D. Marinković","doi":"10.22190/fume220215012d","DOIUrl":"https://doi.org/10.22190/fume220215012d","url":null,"abstract":"Traffic safety is one of the key issues nowadays, given the fact that a large number of people lose their lives in traffic accidents every day. There are various influential factors in the occurrence of traffic accidents, the number of vehicles being one of them. This paper assesses the traffic safety in Montenegro in the period 1998-2020 by applying the multiphase modeling with a purpose to obtain comparative results which enable implementation of adequate strategies. A total of six scenarios were formed with two inputs and two outputs in a DEA (Data Envelopment Analysis) model, with the number of registered vehicles per year being an input in all scenarios. In addition, as inputs, the scenarios included AADT (Annual Average Daily Traffic), passengers in road transport, passenger-km by road transport, goods transported by road, tone-km by road, and passengers in local transport. The number of traffic accidents with casualties, the number of traffic accidents with material damage, the number of fatal cases and the number of injured persons, depending on a scenario, were observed as outputs. After the DEA model, IMF SWARA (Improved Fuzzy Stepwise Weight Assessment Ratio Analysis) was applied to determine the weights of inputs and outputs, while the final state of traffic safety by years was determined using the MARCOS (Measurement of alternatives and ranking according to COmpromise solution) method.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"47 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79736851","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: 17

DESIGN AND CALIBRATION OF THE SYSTEM SUPERVISING BELT TENSION AND WEAR IN AN INDUSTRIAL FEEDER 工业给料机皮带张力与磨损监测系统的设计与标定

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-04-08 DOI: 10.22190/fume201004026r

T. Ryba, M. Rucki, Z. Siemiątkowski, Damian Bzinkowski, Michał Solecki

引用次数: 2

INVESTIGATION OF INFLUENCES OF FABRICATION TOLERANCES ON OPERATIONAL CHARACTERISTICS OF PIEZO-ACTUATED STICK-SLIP MICRO-DRIVES 制造公差对压电驱动粘滑微驱动器工作特性影响的研究

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-04-08 DOI: 10.22190/fume210311036n

X. Nguyen, H. Nguyen

{"title":"INVESTIGATION OF INFLUENCES OF FABRICATION TOLERANCES ON OPERATIONAL CHARACTERISTICS OF PIEZO-ACTUATED STICK-SLIP MICRO-DRIVES","authors":"X. Nguyen, H. Nguyen","doi":"10.22190/fume210311036n","DOIUrl":"https://doi.org/10.22190/fume210311036n","url":null,"abstract":"Piezo-actuated stick-slip micro-drives (PASSMDs) are often used in microrobotic applications due to their advantages of a straightforward design and good operational characteristics. In this work, influences of fabrication tolerances on operational characteristics of PASSMDs are theoretically investigated. A dynamic model describing the whole macroscopic movement of the driver’s runner and the actuators, and the microscopic behavior of the frictional contacts using the method of dimensionality reduction, was used. Three essential parameters of the drives including the angle between working surfaces of the runner, the alignment angle between two actuator blocks on each side of the runner, and the stiffness of an individual actuator, whose values are impacted by the tolerance of the fabrication and assembly process, were considered as the input of the investigation. By performing hybrid-dynamic simulations, influences of these parameters on the drives' operational characteristics, including the repeatability of the step length, the critical amplitude phenomenon, and the maximal-achievable driving frequency/velocity, were evaluated. Simulation results show that these parameters significantly influence on the characteristics of the drives. The contribution of this work is so important that several important phenomena of PASSMDs, which are experimentally detected, are physically explained for the first time. The results of this work could help designers to optimize for better generations of PASSMDs.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"22 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86356797","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

FORCED NONLINEAR OSCILLATOR IN A FRACTAL SPACE 分形空间中的强迫非线性振子

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-04-08 DOI: 10.22190/fume220118004h

Ji-Huan He, G. Moatimid, M. Zekry

{"title":"FORCED NONLINEAR OSCILLATOR IN A FRACTAL SPACE","authors":"Ji-Huan He, G. Moatimid, M. Zekry","doi":"10.22190/fume220118004h","DOIUrl":"https://doi.org/10.22190/fume220118004h","url":null,"abstract":"A critical hurdle of a nonlinear vibration system in a fractal space is the inefficiency in modelling the system. Specifically, the differential equation models cannot elucidate the effect of porosity size and distribution of the periodic property. This paper establishes a fractal-differential model for this purpose, and a fractal Duffing-Van der Pol oscillator (DVdP) with two-scale fractal derivatives and a forced term is considered as an example to reveal the basic properties of the fractal oscillator. Utilizing the two-scale transforms and He-Laplace method, an analytic approximate solution may be attained. Unfortunately, this solution is not physically preferred. It has to be modified along with the nonlinear frequency analysis, and the stability criterion for the equation under consideration is obtained. On the other hand, the linearized stability theory is employed in the autonomous arrangement. Consequently, the phase portraits around the equilibrium points are sketched. For the non-autonomous organization, the stability criteria are analyzed via the multiple time scales technique. Numerical estimations are designed to confirm graphically the analytical approximate solutions as well as the stability configuration. It is revealed that the exciting external force parameter plays a destabilizing role. Furthermore, both of the frequency of the excited force and the stiffness parameter, execute a dual role in the stability picture.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":"54 1","pages":""},"PeriodicalIF":7.9,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87543050","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: 46

Ignition Delay in a Diesel Engine 柴油机点火延迟

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-01-01 DOI: 10.1007/978-90-481-3885-2_5

P. A. Lakshminarayanan, Y. Aghav

引用次数: 23

Particulate Matter from Direct Injection Diesel Engines 直喷柴油机的颗粒物

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-01-01 DOI: 10.1007/978-90-481-3885-2_14

P. A. Lakshminarayanan, Y. Aghav

引用次数: 1

Proposed Correlations for Laminar and Transition Friction Factors in Plain Tubes with Different Inlet Configurations 不同进口结构平面管内层流和转捩摩擦因数的相关性研究

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-01-01 DOI: 10.1007/978-3-030-87281-6_4

A. Ghajar

引用次数: 0

Heat Transfer Results in Plain Tubes with Different Inlet Configurations

IF 7.9 2区工程技术

Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-01-01 DOI: 10.1007/978-3-030-87281-6_5

A. Ghajar

引用次数: 0