Strojniski Vestnik-Journal of Mechanical Engineering最新文献_第8页

Obtaining the Selected Surface Roughness by Means of Mathematical Model Based Parameter Optimization in Abrasive Waterjet Cutting 采用基于数学模型的磨料水射流切割参数优化方法获得所选表面粗糙度

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-10-10 DOI: 10.5545/SV-JME.2017.4463

A. Perec, F. Pude, Michael Kaufeld, K. Wegener

引用次数: 34

Automatable Splicing Method for Steel Cord Conveyor Belts – Evaluation of Water Jetting as a Preparation Process 钢丝绳输送带的自动拼接方法。作为制备工艺的水喷射的评价

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-10-10 DOI: 10.5545/SV-JME.2017.4363

D. Zaremba, P. Heitzmann, L. Overmeyer, Lennart Hillerns, T. Hassel

{"title":"Automatable Splicing Method for Steel Cord Conveyor Belts – Evaluation of Water Jetting as a Preparation Process","authors":"D. Zaremba, P. Heitzmann, L. Overmeyer, Lennart Hillerns, T. Hassel","doi":"10.5545/SV-JME.2017.4363","DOIUrl":"https://doi.org/10.5545/SV-JME.2017.4363","url":null,"abstract":"The increased demand of mineral resources leads to worldwide application of incessantly longer conveying systems. The length between axes can amount to 15 km and more. Owing to manageable dimensions and weight, appropriate conveyor belts are produced in segments of up to 300 m. Final assembly takes place at the conveyor system, where the multitude of segments is connected to a long conveyor belt. An important point in assembly preparation is the stripping of the steel cords, which is mainly carried out manually using rudimentary techniques. The optimization potential is high, since the adoption of automatable and application-oriented preparation methods can minimize the conveyor downtime and improve the joint quality. \u0000In this study, the application of the pure water jet is investigated, since this selective stripping method offers a lot of potential for automation and the creation of rough surfaces. The objective was to determine if an efficient, homogenous and selective removal of the rubber is possible without damaging the zinc coating of the steel cords. Following a parameter study, the generated kerf geometries and surfaces were investigated. The stripped steel cords and zinc coatings were analyzed through the preparation of micrographs. Concluding, an evaluation about the qualification of water jetting as an automatable method for joint and repair preparation is made.","PeriodicalId":49472,"journal":{"name":"Strojniski Vestnik-Journal of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79002883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 6

Influence of Variously Modified Surface of Aluminium Alloy on the Effect of Pulsating Water Jet 铝合金表面不同改性对脉动水射流效果的影响

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-10-10 DOI: 10.5545/SV-JME.2017.4356

J. Klich, Dagmar Klichová, Vladimír Foldyna, P. Hlaváček, J. Foldyna

{"title":"Influence of Variously Modified Surface of Aluminium Alloy on the Effect of Pulsating Water Jet","authors":"J. Klich, Dagmar Klichová, Vladimír Foldyna, P. Hlaváček, J. Foldyna","doi":"10.5545/SV-JME.2017.4356","DOIUrl":"https://doi.org/10.5545/SV-JME.2017.4356","url":null,"abstract":"Erosion effects of a pulsating water jet impinging the surface of aluminium alloy samples pre-treated by various techniques (rough and fine milling, planing and rolling) were studied. The influence of the initial surface topography on the final topography of the sample exposed to the pulsating water jet was investigated. Based on roughness parameter Ra erosion of surface layers was analysed and discussed in relation to the traversing speed of the jet. It was found that initial surface pre-treatment have a significant impact on the final topography of the surface affected subsequently by pulsating water jet. Surfaces, whose properties are significantly affected by the action of some machining processes (i.e. milling) show much greater resistance to pulsating water jet than unpaved surfaces (i.e. rolling) and surfaces have smaller roughness. While milled (rough or fine) or planed surface roughness has approximately the same increase of Ra parameter, only rolled surfaces are up to 150 times rougher after pulsating water jet treatment. This is due to the small hardening of the surface layers and reduced durability against pulsating water jet in comparison with others investigated techniques. The highest roughness was achieved on all pre-treated surfaces at the lowest speeds, because the pulsating water jet affects the surface for a longer time.","PeriodicalId":49472,"journal":{"name":"Strojniski Vestnik-Journal of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74780146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 16

Optimization of Hybrid Manufacturing for Surface Quality, Material Consumption and Productivity Improvement 基于表面质量、材料消耗和生产率提高的混合制造优化

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-10-10 DOI: 10.5545/SV-JME.2017.4396

D. Grguraš, D. Kramar

引用次数: 11

Effects of Continuous and Pulsating Water Jet on CNT/Concrete Composite 连续和脉动水射流对碳纳米管/混凝土复合材料的影响

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-10-10 DOI: 10.5545/SV-JME.2017.4357

Vladimír Foldyna, J. Foldyna, Dagmar Klichová, J. Klich, P. Hlaváček, L. Bodnárová, T. Jarolím, K. M. Kutláková

引用次数: 9

Low Cost Printer for DLP Stereolithography 用于DLP立体光刻的低成本打印机

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-10-10 DOI: 10.5545/SV-JME.2017.4591

J. Valentinčič, Matej Peroša, Marko Jerman, I. Sabotin, A. Lebar

{"title":"Low Cost Printer for DLP Stereolithography","authors":"J. Valentinčič, Matej Peroša, Marko Jerman, I. Sabotin, A. Lebar","doi":"10.5545/SV-JME.2017.4591","DOIUrl":"https://doi.org/10.5545/SV-JME.2017.4591","url":null,"abstract":"A general research direction of stereolithography based on digital light processing (DLP) is to reduce the production time and to increase manufacturing accuracy. Compared to fused deposition modelling (FDM) machines, machines for DLP stereolithography are expensive andthus not available to a broad range of users as it is the case with FDM 3D printers. Comparing technologies, DLP stereolithography offers quicker and more accurate production. In this paper, performances of a low cost DLP stereolithographic printer is presented. Three main challenges are treated: an uneven illumination of commercial DLP projectors, a direction of illumination and a selection of optimal 3D printing parameters. Uneven illumination of DLP projector results in smaller usable working area and poor printing quality. The problem is solved by implementing an appropriate software mask, thus the product quality is not influenced by its position on a working table. The direction of illumination has a key role in DLP stereolithography. It is shown that constrained surface (illumination through a transparent bottom of the vat) gives better 3D printing accuracy compared to free surface (illumination of the photopolymer surface) stereolithography. To further improve the product quality, the optimal process parameters are determined. Using the Taguchi based surface response methodology optimal process parameters are defined and by using them, the deviation of the actual dimensions from the specified dimensions is less than 80 μm.","PeriodicalId":49472,"journal":{"name":"Strojniski Vestnik-Journal of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90927371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 20

Integrative CAE-Driven Design Process in the Embodiment Design Phase of L7e Vehicle Structures L7e型汽车结构具体化设计阶段的集成cae驱动设计过程

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-09-15 DOI: 10.5545/SV-JME.2017.4489

Roman Pawel Jedrzejczyk, M. Alb, T. Jost

{"title":"Integrative CAE-Driven Design Process in the Embodiment Design Phase of L7e Vehicle Structures","authors":"Roman Pawel Jedrzejczyk, M. Alb, T. Jost","doi":"10.5545/SV-JME.2017.4489","DOIUrl":"https://doi.org/10.5545/SV-JME.2017.4489","url":null,"abstract":"In the past decade, the mechanical engineering industry has searched for a design methodology that could systematically unify the support of computer-aided engineering (CAE) tools for the design process. More recently, some propositions have been put forward for the CAE-driven design process (CDDP), but the efficiency of these design processes is questionable. We have proposed improvements and new arrangements that result in the integrative CDDP (ICDDP), which makes CDDP more reliable, efficient and predictive. The ICDDP redefines the role of CAE tools and positions the optimization technology as a fundamental driving force behind the whole design process. Consequently, the ICDDP orders design phases as: (1) conceptual design, (2) design crystallization and (3) design sophistication, which steer the design process sequentially. The accurately established linkages between the sequential design steps enhance the smooth recurrence of the ICDDP for new product executions. In addition, this work demonstrates the application of the conceptual design phase to design a new L7e (eQuad) vehicle structure. This phase of the ICDDP illustrates the specific steering methodology for the topology optimization of a new eQuad structure as well as the geometric solution derivation step that reveals the transformation of bionic shapes into rough manufacturable geometry. Additionally, the numerical verification of the simple geometric model is presented for the load cases given. Our results exemplify the fact that the ICDDP allows engineers to design new innovative and lightweight structures.","PeriodicalId":49472,"journal":{"name":"Strojniski Vestnik-Journal of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2017-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78405347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Neural Network-Based High-Accuracy Motion Control of a Class of Torque-Controlled Motor Servo Systems with Input Saturation 一类输入饱和转矩伺服系统的神经网络高精度运动控制

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-09-14 DOI: 10.5545/SV-JME.2016.4282

Lei Liu, Jianpei Hu, Yuangang Wang, Zhiwei Xie

引用次数: 2

Electric-Thermo-Mechanical Analysis of Joule Heating in Dilatometric Specimens 膨胀试样焦耳加热的电-热-力学分析

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-09-14 DOI: 10.5545/SV-JME.2017.4320

M. Herrejón-Escutia, G. Solorio‐Diaz, H. Vergara-Hernández, E. López-Martínez, G. M. Chávez-Campos, O. Vázquez–Gómez

引用次数: 6

Wall roughness influence on the efficiency characteristics of centrifugal pump. 壁面粗糙度对离心泵效率特性的影响。

IF 1.7 4区工程技术

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2017-09-14 DOI: 10.5545/SV-JME.2017.4526

A. Lipej, S. Muhič, D. Mitruševski

{"title":"Wall roughness influence on the efficiency characteristics of centrifugal pump.","authors":"A. Lipej, S. Muhič, D. Mitruševski","doi":"10.5545/SV-JME.2017.4526","DOIUrl":"https://doi.org/10.5545/SV-JME.2017.4526","url":null,"abstract":"Many different machines are developed in industry and in terms of energy conversion, their efficiency is one of the most important parameters. A lot of theoretical, experimental and numerical analyses are done in the development process in order to obtain required characteristics. Computational fluid dynamics (CFD) analyses are a very important part of the development process. To obtain accurate results it is important to pay attention to geometry definition, usage appropriate numerical model, quality of the computational grid, realistic boundary conditions and all of the other parameters regarding fluid and solid material properties. A very important issue is usually the correct selection of the turbulence model. In most CFD analyses, only smooth surface is taken into account without considering any wall roughness. Besides the usage of different physical and mathematical models and all required parameters, the wetted surface roughness can also be one of the important origins of the numerical results inaccuracy. In the paper, the analysis of the influence of different parameters such as the sandgrain equivalent parameter is presented. The influence of y+ on the accuracy of the flow analysis with different absolute roughness of the surfaces is also analyzed. For basic relations, the flow in simple geometries like flow over flat plate and flow in circular pipe has been analyzed. The conclusions of the preliminary research work are used in the case of efficiency prediction of centrifugal pump with rough walls. The final numerical results are compared with the experimental ones and show better agreement in comparison with the flow over smooth walls.","PeriodicalId":49472,"journal":{"name":"Strojniski Vestnik-Journal of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2017-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89105325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 8