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Evaluation of skull bone structures in CT imaging 颅骨结构的CT成像评价
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2019.126373
Andrzej Ryniewicz, Wojciech Ryniewicz, Stanisław Wyrąbek, Łukasz Bojko
{"title":"Evaluation of skull bone structures in CT imaging","authors":"Andrzej Ryniewicz, Wojciech Ryniewicz, Stanisław Wyrąbek, Łukasz Bojko","doi":"10.24425/ame.2019.126373","DOIUrl":"https://doi.org/10.24425/ame.2019.126373","url":null,"abstract":"At the current stage of diagnostics and therapy, it is necessary to perform a geometric evaluation of facial skull bone structures basing upon virtually reconstructed objects or replicated objects with reverse engineering. The objective hereof is an analysis of imaging precision for cranial bone structures basing upon spiral tomography and in relation to the reference model with the use of laser scanning. Evaluated was the precision of skull reconstruction in 3D printing, and it was compared with the real object, topography model and reference model. The performed investigations allowed identifying the CT imaging accuracy for cranial bone structures the development of and 3D models as well as replicating its shape in printed models. The execution of the project permits one to determine the uncertainty of components in the following procedures: CT imaging, development of numerical models and 3D printing of objects, which allows one to determine the complex uncertainty in medical applications.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135584386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
131708 131708
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2020.131708
{"title":"131708","authors":"","doi":"10.24425/ame.2020.131708","DOIUrl":"https://doi.org/10.24425/ame.2020.131708","url":null,"abstract":"","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135633925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wear and surface characteristics on tool performance with CVD coating of Al2O3/TiCN inserts during machining of Inconel 718 alloys Al2O3/TiCN CVD涂层加工Inconel 718合金时刀具磨损及表面特征
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.139647
{"title":"Wear and surface characteristics on tool performance with CVD coating of Al2O3/TiCN inserts during machining of Inconel 718 alloys","authors":"","doi":"10.24425/ame.2021.139647","DOIUrl":"https://doi.org/10.24425/ame.2021.139647","url":null,"abstract":"The Inconel 718 alloys, which are primarily temperature resistant, are widely used in aviation, aerospace and nuclear industries. The study on dry cutting processes for this alloy becomes difficult due to its high hardness and low thermal conductivity, wherein,mostoftheheattransfersduetofrictionareaccumulatedoverthetoolsurface. Further,severalchallengeslikeincreasedcuttingforce,developinghightemperature andrapidtoolwearareobservedduringitsmachiningprocess.Toovercomethese, thecoatedtoolinsertsareusedformachiningthesuperalloys.Inthepresentwork, thecementedcarbidetooliscoatedwithchemicalvapordepositionmulti-layering Al 2 O 3 /TiCN under the dry cutting environment. The machining processes are carried out with varying cutting speeds: 65, 81, 95","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135635309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Hybrid nano improved phase change material for latent thermal energy storage system: Numerical study 用于潜热储能系统的混合纳米改进相变材料:数值研究
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2022.140410
{"title":"Hybrid nano improved phase change material for latent thermal energy storage system: Numerical study","authors":"","doi":"10.24425/ame.2022.140410","DOIUrl":"https://doi.org/10.24425/ame.2022.140410","url":null,"abstract":"The phase change materials (PCM) are widely used in several applications, especially in the latent heat thermal energy storage system (LHTESS). Due to the very low thermal conductivity of PCMs. A small mass fraction of hybrid nanoparticles TiO 2 –CuO (50%–50%) is dispersed in PCM with five mass concentrations of 0%, 0.25%, 0.5%, 0.75% and 1 mass % to improve its thermal conductivity. This article is focused on thermal performance of the hybrid nano-PCM (HNPCM) used for the LHTESS. A numerical model based on the enthalpy-porosity technique is developed to solve the Navier-Stocks and energy equations. The computations were conducted for the melting and solidification processes of the HNPCM in a shell and tube latent heat storage (LHS). The developed numerical model was validated successfully with experimental data from the literature. The results showed that the dispersed hybrid nanoparticles improved the effective thermal conductivity and density of the HNPCM. Accordingly, when the mass fraction of a HNPCM increases by 0.25%, 0.5%, 0.75% and 1 mass %, the average charging time improves by 12.04 %, 19.9 %, 23.55%, and 27.33 %, respectively. Besides, the stored energy is reduced by 0.83%, 1.67%, 2.83% and 3.88%, respectively","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135636096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Numerical analysis of structure, stability and entropy generation in biogas coflow diffusion flames 沼气共流扩散火焰结构、稳定性及熵产的数值分析
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.139648
{"title":"Numerical analysis of structure, stability and entropy generation in biogas coflow diffusion flames","authors":"","doi":"10.24425/ame.2021.139648","DOIUrl":"https://doi.org/10.24425/ame.2021.139648","url":null,"abstract":"Biogas is a gaseous biofuel predominantly composed of methane and carbon-dioxide. Stability of biogas flames strongly depend upon the amount of carbon-dioxide present in biogas, which varies with the source of biomass and reactor. In this paper, a comprehensive study on the stability and flame characteristics of coflow biogas diffusion flames is reported. Numerical simulations are carried out using reactive flow module in OpenFOAM, incorporated with variable thermophysical properties, Fick’s and Soret diffusion, and short chemical kinetics mechanism. Effects of carbon-dioxide content in the biogas, temperatures of the fuel or coflowing air streams (preheated reactant) and hydrogen addition to fuel or air streams are analyzed. Entropy generation in these flames is also predicted. Results show that the flame temperature increases with the degree of preheat of reactants and the flames show better stability with the preheated air stream. Preheating the air contributes to increased flame stability and also to a significant decrease in entropy generation. Hydrogen addition, contributing to the same power rating, is seen to be relatively more effective in increasing the flame stability when added to the fuel stream. Results in terms of flow, temperature, species and entropy fields, are used to describe the stability and flame characteristics.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135636328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of thermal performance factor for solar air heaters with artificially roughened channels 人工粗糙通道太阳能空气加热器的热性能系数评价
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.137048
{"title":"Evaluation of thermal performance factor for solar air heaters with artificially roughened channels","authors":"","doi":"10.24425/ame.2021.137048","DOIUrl":"https://doi.org/10.24425/ame.2021.137048","url":null,"abstract":"Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s ) , friction factor ratio ( f / f s ) and thermal performance factor ( η ) . Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30 ◦ , 45 ◦ , 60 ◦ and 90 ◦ trapezoidal corrugated geometries while case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45 ◦ are the best configurations for case A and B, respectively. The 45 ◦ corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s , f / f s and η respectively.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Electrical discharge machining of difficult to cut materials 电火花加工难切削材料
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2018.125437
Rafał Świercz, Dorota Oniszczuk-Świercz, Lucjan Dąbrowski
{"title":"Electrical discharge machining of difficult to cut materials","authors":"Rafał Świercz, Dorota Oniszczuk-Świercz, Lucjan Dąbrowski","doi":"10.24425/ame.2018.125437","DOIUrl":"https://doi.org/10.24425/ame.2018.125437","url":null,"abstract":"The development of industry is determined by the use of modern materials in the production of parts and equipment. In recent years, there has been a significant increase in the use of nickel-based superalloys in the aerospace, energy and space industries. Due to their properties, these alloys belong to the group of materials hard-to-machine with conventional methods. One of the non-conventional manufacturing technologies that allow the machining of geometrically complex parts from nickel-based superalloys is electrical discharge machining. The article presents the results of experimental investigations of the impact of EDM parameters on the surfaces roughness and the material removal rate. Based on the results of empirical research, mathematical models of the EDM process were developed, which allow for the selection of the most favourable processing parameters for the expected values of the surface roughness Sa and the material removal rate.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Assessment of exploitation properties of cast aluminium alloys on the basis of creep and LCF investigations 基于蠕变和LCF研究的铸铝合金开发性能评价
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132110
L. Dietrich, A. Rutecka, Z. L. Kowalewski
{"title":"Assessment of exploitation properties of cast aluminium alloys on the basis of creep and LCF investigations","authors":"L. Dietrich, A. Rutecka, Z. L. Kowalewski","doi":"10.24425/ame.2009.132110","DOIUrl":"https://doi.org/10.24425/ame.2009.132110","url":null,"abstract":"In spite of the great progress in modelling of material behaviour achieved during last decade, there is still a necessity to determine a model which would describe complex material processes more accurately. Among many problems to be solved, a proper model selection and its verification on the basis of experimental data seems to be the most important nowadays. Since the creep and fatigue mechanisms differ from each other, it is important to perform experiment on both kinds of mechanisms to be able to verify models. The paper presents the creep and LCF results of the AlSi8Cu3 and AlSi7MgCu0.5 cast aluminium alloys. For both materials, two levels of porosity were considered. Low porosity material (melt) was degassed during production to achieve the density index less than 3%. The high porosity material was not degassed in order to enlarge the density index up to a value higher than 6%. Up to now, many efforts are made to carry out investigations whose main objective is to find such a parameter, which would allow for describing a dam-","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Numerical analysis on the influence of suspended equipment on the ride comfort in railway vehicles 悬挂装置对轨道车辆平顺性影响的数值分析
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2018.125438
M. Dumitriu
{"title":"Numerical analysis on the influence of suspended equipment on the ride comfort in railway vehicles","authors":"M. Dumitriu","doi":"10.24425/ame.2018.125438","DOIUrl":"https://doi.org/10.24425/ame.2018.125438","url":null,"abstract":"To study the impact of suspended equipment on the ride comfort in a railway vehicle, a rigid flexible general model of such a vehicle is required. The numerical simulations is based on two different models, derived from the general model of the vehicle, namely a reference model of a vehicle with no equipment, and another model with six suspended elements of equipment mounted in various positions along the carbody. The objective of this paper arises from the observation that the literature does not contain any study that highlights the change in the ride comfort resulting exclusively due to the influence of equipment. The influence of the suspended equipment on the ride comfort is determined by comparing the ride comfort indices calculated in the carbody reference points, at the centre and above the two bogies, for a model with six elements of equipment and a model of the vehicle with no equipment.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Effect of surface roughness on steady performance of hydrostatic thrust bearings: Rabinowitsch fluids 表面粗糙度对静压推力轴承稳定性能的影响:Rabinowitsch流体
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.137045
Udaya P. Singh
{"title":"Effect of surface roughness on steady performance of hydrostatic thrust bearings: Rabinowitsch fluids","authors":"Udaya P. Singh","doi":"10.24425/ame.2021.137045","DOIUrl":"https://doi.org/10.24425/ame.2021.137045","url":null,"abstract":"The present theoretical study is concerned with the analysis of surface roughness effects on the steady state performance of stepped circular hydrostatic thrust bearings lubricated with non-Newtonian Rabinowitsch fluids. To take the effects of surface roughness into account, Christensen theory of rough surface has been adopted. Expression for pressure gradient has been derived by means of energy integral approach. Results for film pressure, load carrying capacity and lubricant flow rate has been plotted and analysed on the basis of numerical results. Significant variations in the theoretical results of these properties have been observed.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135584137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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