Universal Journal of Mechanical Engineering最新文献

{"title":"Grey Relational Analysis Parameter-Based Predictive Modelling of Surface Roughness","authors":"Z. Hweju, K. Abou-El-Hossein","doi":"10.13189/ujme.2021.090301","DOIUrl":"https://doi.org/10.13189/ujme.2021.090301","url":null,"abstract":"Grey relational analysis is a widely used approach for the purposes of decision making, prediction and relational investigation. This study utilizes the grey relational analysis for modelling surface roughness during the single point diamond turning of RSA-443. The utilized parameter in this study is the grey relational grade together with cutting speed, feed, and depth of cut. The Taguchi L9 orthogonal array has been utilized for designing the experiment, with three extra experimental runs being carried out for the purposes of validating the developed model. The developed model indicates that the cutting parameters are insignificant as predictors of surface roughness. Grey relational grade is the only significant predictor of surface roughness. Acoustic emission signal root mean square has been used for determining the grey relational grade in the study. The grey relational analysis-based surface roughness values have been compared to experimentally obtained values by using the Mean Absolute Percentage Error (MAPE). The accuracy levels are an exhibition of high prediction power of the model. Pair t-test results indicate the lack of statistical significance in the difference between the experimentally measured and predicted surface roughness values.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"422 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131097934","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}

{"title":"Acoustic Emission and Surface Roughness in Ultra-Precision Diamond Turning of RSA 6061 for Optics Applications","authors":"Odedeyi Peter Babatunde, Abou-El-Hossein Khaled, A. Lukman","doi":"10.13189/ujme.2021.090201","DOIUrl":"https://doi.org/10.13189/ujme.2021.090201","url":null,"abstract":"Machining Rapidly Solidified aluminium (RSA) 6061, a widely used optical material by Ultra-high precision diamond turning, has enabled high accuracy and surface integrity. However, improved quality and productivity require precision surface and machining process monitoring because the duo has a great influence on machine part performance. The study presented in this paper investigates the effects of cutting parameters (i.e., depth of cut, feed rate and cutting speed) on machining output variables (surface roughness and acoustic emission potentials) during ultra-high precision diamond turning of RSA 6061. With the aid of Box-Behnken design (BBD), a response surface methodology, and the analysis of variance (ANOVA), the correlation between cutting parameters and machining output variables were analyzed and modeled. The results showed that both surface roughness and acoustic emission potentials are greatly influenced by feed rate and cutting speed. For a better-quality surface roughness and low acoustic emission during ultra-high precision diamond turning of RSA 6061, high cutting speed and low feed rates are the right combinations and vice versa.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123718781","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}

{"title":"Effect on the Mechanical Properties of Grey Cast Iron with Variation of Molybdenum and AS – Cast Alloying Elements","authors":"Sujith Bobba, M. S. Rao, B. H. Babu, Z. Leman","doi":"10.13189/UJME.2020.080602","DOIUrl":"https://doi.org/10.13189/UJME.2020.080602","url":null,"abstract":"Metal casting is a predominant manufacturing advancement for adeptly fabricating components with complicated shapes. Many of the industrial castings produced are made from steel and iron alloys with attractive properties and less production cost. In this research work, the effect of molybdenum addition to class 30 type grey cast iron for the production of high performance cast iron (HPCI) has been carried out. Molybdenum inclusion not only refines the majority of graphite flakes but also increases the length of a small fraction of graphite flakes and improves the thermal conductivity by a percentage up to 2.2% fixed as per the research conducted, while excessive molybdenum insertion not only induces precipitation and solution reinforcement but it will also enhance the ultimate tensile strength (UTS) and hardness. According to research conducted, it was proved that molybdenum inclusion of 120 gm showed a functional way to spread HPCI with enhancing mechanical and thermal properties in grey cast iron when compared to other percentages of molybdenum used and also the average difference in the percentage of hardness in each type of molybdenum sample is about 5 to 10 %. Finally, after the tests, it was also predicted that the molybdenum's hardenability property was beneficial for white cast iron production which will rise the wear resistance property.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121107113","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}

{"title":"Determination of the Optimal Replacement Age for the Preventive Maintenance of Bearing Assemblies Involving Weibull Failure Probability Distribution Functions","authors":"E. Gutierrez-Miravete","doi":"10.13189/UJME.2020.080601","DOIUrl":"https://doi.org/10.13189/UJME.2020.080601","url":null,"abstract":"This paper describes the determination of optimal replacement age for bearing systems with failure times described by Weibull distributions. Optimal age replacement policies are determined for bearing assemblies produced two different types of steel. The parameters of the Weibull probability distribution functions for the bearings were determined by non-linear least square analysis from published data on rolling contact fatigue lives. The resulting distribution functions are used as inputs into the standard expression for the maintenance cost of an age replacement policy and manipulated symbolically using the computer program Maple. These yields closed form expressions for the policy costs that invariably exhibit the well-known vase shape characteristic of these types of problems. The resulting expressions can then be easily used to determine the optimal replacement age of the bearing components. The problem of determining the optimal age replacement policy of bearing assembles consisting of independent components arranged in series is also examined. The effect on the optimal age replacement time of using the same type steel to manufacture all the components is compared with that of building the bearing assembly using components made with different steels. As expected, the results clearly show the increased superiority of the higher-quality steel components in the form of much longer optimal replacement ages. However, replacement policy efficiencies depend on replacement time in a complex fashion. Moreover, the results also suggest that building bearing assemblies combining high quality and low quality steel components may be wasteful. Overall, computer experimentation and examination of the behavior of cost functions using symbolic manipulation with Maple can produce useful guidelines for the design of optimal age replacement policies.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126151191","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}

{"title":"Bolt Tightening Methods on the Combined Surface of Assembly Structure","authors":"L. Tseng, C. Chung, W. L. Huang","doi":"10.13189/UJME.2020.080603","DOIUrl":"https://doi.org/10.13189/UJME.2020.080603","url":null,"abstract":"Machine tools are assembled by thousands of components. The surface between two components is the mating surface. The bolt tightening methods will affect the stress and deformation of mating surface which influences the accuracy and rigidity of machine tools. In the precision machinery industry, if the structure needs to tighten in line such as linear guideway, the senior engineers will tighten the bolts from sides to the middle or middle to sides instead of tightening in order. Furthermore, engineers use two-step of tightening rather than one-step of tightening. Based on their experience, these tightening methods will reduce the stress of mating surface and increase the rigidity of entire structure. In this study, the three bolts tightening model is used to investigate these tightening methods. Three bolts tightening CAD model is created by using the SolidWorks software. The finite element analysis is used the ANSYS workbench R19 software to simulate the bolt tightening methods (tightening sequences and pre-tightening force ratio) on the mating surface and entire model. From the simulation results, the minimum stress is observed in the tightening sequence from sides to middle and maximum stress is obtained in the tightening sequence in order. The experimental results of bolt tightening sequences match the simulation results. The stresses of mating surface and entire model drastically decrease when the tightening step is two-step of tightening. In two-step tightening process, the pre-tightening force ratio 1:1 is the optimal tightening methods for reducing the stress of mating surface compared to another pre-tightening force ratio.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"30 21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116697721","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}

{"title":"Numerical Investigation of Different RANS Model on Supersonic Jet in Presence of Passive Jet Controls","authors":"D. Lohia, H. K. Paliwal","doi":"10.13189/ujme.2020.080502","DOIUrl":"https://doi.org/10.13189/ujme.2020.080502","url":null,"abstract":"","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122256812","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}

{"title":"Assessment of Geometric Accuracy of a 5-axis CNC Machine in the Context of Machining Aircraft Transmission Housings","authors":"Grzegorz Bomba, P. Gierlak","doi":"10.13189/ujme.2020.080503","DOIUrl":"https://doi.org/10.13189/ujme.2020.080503","url":null,"abstract":"This article presents a procedure whose goal was to develop an effective methodology for deploying a 5-axis milling centre in industrial conditions. The method presented in the article, based on the manufacturing of the test piece, aims to reduce the time to deploy a new machine and minimize the effort put in by technological services and maintenance during tests and the process of deploying the machine tool in production. The test piece and its position have been designed in such a way that its manufacture forces the use of complex machine movements in the extreme area of the working space. The paper presents the results of tests involving the machining of a test piece on a CNC machine, measurement of the shape and dimensional characteristics of the object using CMM and analysis of machining accuracy in the context of the use of the machine in the production of aircraft transmission bodies. The material of the test piece is the same as the material of aircraft transmission housings, i.e. aluminum alloy. The universality of presented method is due to the fact that it is independent of the size of the machine's machining space, machine kinematics and also the special functions possessed by the machine; however, it gives a representation of their operation in the form of measuring sheets from the measuring laboratory.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127607860","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}

{"title":"Understanding Fiber-Matrix Integrity in Fiber-Reinforced Polymer Composites from Strain Rate Sensitivity Concept","authors":"J. E. Sinebe, J. Chukwuneke, S N Omenyi","doi":"10.13189/ujme.2020.080501","DOIUrl":"https://doi.org/10.13189/ujme.2020.080501","url":null,"abstract":"The understanding of fiber-matrix integrity in fiber-reinforced polymer composites from strain rate sensitivity concept was considered from interfacial energetics point-of-view. The methodology involved the preparation of plantain fibers, treatment of fibers with nine different liquids to render their surfaces hydrophobic, molding of fiber reinforced composites, measurement of contact angles on fibers and composites, composites tensile strength determination, and fiber pullout tests. The results showed that Methyl Ethyl Ketone Peroxide (MEKP) and mercerization (NaOH) rendered the fibers most hydrophobic. MEKP and NaOH treated fibers gave the lowest surface energies, maximum works of adhesion and hence better fiber-matrix bonding (increased fiber-matrix integrity) when compared with other treatments. The strain-rate sensitivity index, m, obtained ranged from 0.2264 for phosphoric acid-treated fiber in the composite to 0.2385 MEKP treatment fiber with an overall average value of m of 0.2341, while the value of m, for untreated fiber reinforced composite was 0.2321. MEKP and NaOH treated fibers were most hydrophobic gave the highest m values and therefore most desired for treatment of fibers for composite formation. The pullout tests result showed that increase in work of adhesion led to an increase in the tensile energy, showing that stronger bonding will guarantee fiber-matrix composite stability and integrity. MEKP and NaOH with maximum free energies of adhesion also exhibit maximum pullout forces which implied that the bonding between fiber and matrix was stronger for these treatments and hence higher fiber-matrix integrity in the composite. It was also shown that the pull-out force increased with the strain rate sensitivity index confirming that one would need composites with higher m-values for stronger fiber/matrix composites. The results of this work are very important in structures that are made with fiber reinforced composite materials, such as, airplane and car bodies. This work shows that the use of the adhesive energy-stress concept to determine the strain rate is valid since the values of strain rate sensitivity indices calculated are comparable with values reported in the literature and that fiber-matrix integrity can be understood from interfacial free energies and strain rate sensitivity concepts.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130631008","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}

{"title":"The Effect of Bolt Locking Sequences and Anchor Bolt Design on Machine Tool","authors":"L. Tseng, C. Y. Wu, H. Tsai, C. Chung, W. L. Huang","doi":"10.13189/ujme.2020.080505","DOIUrl":"https://doi.org/10.13189/ujme.2020.080505","url":null,"abstract":"Machine tool is an important role in the industry because the mechanical components or products are manufactured by machine tools. The machine tools are assembled by components. The surface between two components is the combined or contact surface. Different bolt locking sequences will affect the combined surface in the machine tool. In this study, the SolidWorks software is used to create the CAD model. The finite element simulation is used the ANSYS software to simulate the influence of bolt locking methods on the combined surface of column structure and guideway and the fillet radius design on the deformation of anchor bolts. From the simulation results, the minimum deformation of the column is observed in the locking sequence from middle to both sides. The stress distribution of the combined surface is slightly difference of three locking methods. The simulation results of the guideway show that the minimum displacement of combined surface is obtained by using locking sequence from outside to the middle. The maximum displacement is obtained locking sequence from right to the left order. From the simulation results of anchor bolt, increasing the fillet radius of anchor bolt decreases the deformation of anchor bolts. The deformation of anchor bolts drastically decreases with increasing the fillet radius from R8 to R60. The simulation models and results provide the reference for the bolt locking sequence and anchor bolt fillet radius design.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122571165","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}

{"title":"Performance of a Double-cantilever Dynamic Vibration Absorber (DCDVA) Oriented in Transverse and Longitudinal Directions","authors":"S. Adewusi","doi":"10.13189/ujme.2020.080504","DOIUrl":"https://doi.org/10.13189/ujme.2020.080504","url":null,"abstract":"This paper presents the vibration attenuation performance of a double-cantilever dynamic vibration absorber (DCDVA) attached to a simply-supported beam in two different orientations using theoretical and experimental methods. The results showed that the longitudinal configuration of the DCDVA yield better vibration attenuation by absorbing 80% more vibration than the transverse configuration. For the experimental results, the orientation of the DCDVA has very little effect on the resonant frequencies of the combined DCDVA and simply-supported beam system. However the damping of the second resonant frequency is higher for the transverse configuration. The lumped-mass model characterized the frequency response functions of the DCDVA oriented in the transverse direction only, the model could not reproduce the experimental response for the longitudinal orientation of the DCDVA.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116615969","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}