Journal of applied mechanical engineering最新文献_第6页

Reshaping the future of aircraft design 重塑飞机设计的未来

Journal of applied mechanical engineering Pub Date : 2017-11-02 DOI: 10.4172/2168-9873-C1-011

E. Costa

引用次数: 1

The Noise Dipole Source Prediction of Far-Field Acoustic Pressure for Marine Propeller using Inverse Method 舰船螺旋桨远场声压噪声偶极声源反演方法研究

Journal of applied mechanical engineering Pub Date : 2017-10-28 DOI: 10.4172/2168-9873.1000290

M. Bagheri, H. Mehdigholi, Seif Ms, H. Rajabnia

{"title":"The Noise Dipole Source Prediction of Far-Field Acoustic Pressure for Marine Propeller using Inverse Method","authors":"M. Bagheri, H. Mehdigholi, Seif Ms, H. Rajabnia","doi":"10.4172/2168-9873.1000290","DOIUrl":"https://doi.org/10.4172/2168-9873.1000290","url":null,"abstract":"The unsteady rotating force or dipole strength distribution, acting by the fan or propeller on the fluid, is predicted by inverse method. In this method, the far-field acoustic pressures are used in non-cavitating condition. In this paper, the far-field acoustic pressures are obtained from Ffowcs Williams and Hawkings (FW-H) equations using computational fluid dynamic (CFD) in specific hydrophone array and then the unsteady rotating force, acting by the propeller on the fluid, is obtained as the most important sound source in non-cavitating condition. The unsteady rotating forces are extracted using inverse method by analytical code in Matlab. The correct solution is independence to the optimum select of regularization parameter from transfer function; the transfer function represents relationship between the force coefficients and the far-field acoustic pressure. Therefore, the appropriate range of regularization parameter should be choice in order to an ill-conditioned problem from transfer function is solve. The analytical code is solved for different regularization parameters and then the unsteady rotating forces are obtained for three sections on the blade surface. The inverse method could be used for dipole strength distribution calculation as the most important sound source in non-cavitating condition in order to design the noiseless of marine propeller.","PeriodicalId":90573,"journal":{"name":"Journal of applied mechanical engineering","volume":" ","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2017-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4172/2168-9873.1000290","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45913742","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

Effect of Strain Rate and Relative Density on the Compressive Deformation of Open Cell Ti6Al Alloy Foam through P/M Route 应变速率和相对密度对开孔泡沫Ti6Al合金P/M压缩变形的影响

Journal of applied mechanical engineering Pub Date : 2017-10-27 DOI: 10.4172/2168-9873.1000291

Mondal Dp, Barnwal Ak, Diwakar

{"title":"Effect of Strain Rate and Relative Density on the Compressive Deformation of Open Cell Ti6Al Alloy Foam through P/M Route","authors":"Mondal Dp, Barnwal Ak, Diwakar","doi":"10.4172/2168-9873.1000291","DOIUrl":"https://doi.org/10.4172/2168-9873.1000291","url":null,"abstract":"Open cell Ti6Al alloy foams of varying porosity fractions have been made using ammonium bicarbonate as space holder through powder metallurgy route. In order to provide the sufficient strength in green compacts 2% of wt.% PVA solution was mixed with elemental metal powder and NH4(HCO3) particle prior to cold compaction. Green pallets were sintered at three stages at three different temperatures 600°C, 800°C and 1100°C. XRD and EDX analyses confirmed that no residue of space holder remained in the sintered foam samples. The compressive deformation behavior of Ti6Al alloy foams with varying relative densities was conducted under different strain rates (0.01, 0.1, and 1.0 s-1). The plateau stress, the Young’s modulus and the energy absorption of the foam increase with increase in the relative density following power law relationships. But the densification strain decreases with increases in relative density following a linear relationship. The strain rate sensitivity and the strain rate sensitivity parameter of these foams were also examined, and it was found that the strain rate sensitivity parameters were varying in the range 0.034 to 0.078.","PeriodicalId":90573,"journal":{"name":"Journal of applied mechanical engineering","volume":"6 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2017-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4172/2168-9873.1000291","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43745338","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: 5

Precision Robotic-Assisted Implantation for Preclinical StereotacticNeurosurgery 用于临床前立体定向神经外科的精密机器人辅助植入

Journal of applied mechanical engineering Pub Date : 2017-07-08 DOI: 10.4172/2168-9873.1000279

S. Abbaszadeh, Wu Hch

引用次数: 0

Kinematics of Invisible Hinge 不可见铰链的运动学

Journal of applied mechanical engineering Pub Date : 2017-07-08 DOI: 10.4172/2168-9873.1000281

A. Toropov, Robertis Ad

引用次数: 0

Stresses of Coatings Based on a Solution of Expanded Polystyrene DuringCuring 膨胀聚苯乙烯涂料固化过程中的应力

Journal of applied mechanical engineering Pub Date : 2017-07-08 DOI: 10.4172/2168-9873.1000280

Loganina Vi, Kislitsyna Sn, Mazhitov Yb

引用次数: 0

Effect of Epoxy Functional Groups on the Properties of Carbon Fiber-EpoxyComposites 环氧官能团对碳纤维-环氧复合材料性能的影响

Journal of applied mechanical engineering Pub Date : 2017-06-16 DOI: 10.4172/2168-9873.1000276

Yoshida S

引用次数: 2

Intelligent Control System for Autonomous Underwater Robots with VisionCapabilities 具有视觉能力的自主水下机器人智能控制系统

Journal of applied mechanical engineering Pub Date : 2017-06-16 DOI: 10.4172/2168-9873.1000270

A. Jebelli, Yagoub Mce, B. Dhillon

引用次数: 1

An Experimental Study on the Effect of IS700 Coating on the CavitationInception and Development, and Noise Reduction of a Marine Propeller IS700涂层对船用螺旋桨空化产生、发展及降噪影响的实验研究

Journal of applied mechanical engineering Pub Date : 2017-06-06 DOI: 10.4172/2168-9873.1000267

M. Bagheri, Seif Ms, H. Mehdigholi

引用次数: 1

Field Study and Evaluation of Buckling Behaviour of Steel Tanks underGeometric Imperfections 几何缺陷下钢制储罐屈曲行为的现场研究与评价

Journal of applied mechanical engineering Pub Date : 2017-06-06 DOI: 10.4172/2168-9873.1000268

M. Rastgar, H. Showkati

{"title":"Field Study and Evaluation of Buckling Behaviour of Steel Tanks underGeometric Imperfections","authors":"M. Rastgar, H. Showkati","doi":"10.4172/2168-9873.1000268","DOIUrl":"https://doi.org/10.4172/2168-9873.1000268","url":null,"abstract":"Shells are among the most frequent structural components which are used in construction and industrial projects. Shell structures are composed of shell bearing elements and mainly used in oil and gas tanks, offshore marine platforms, silos, funnels, cooling towers, ship and aircraft body, etc. Despite the frequent use of steel cylindrical shells, their construction and assembling process has caused main problems. In these structures, there is no possibility for the integrated construction due to their large shell extent and they are built using a number of welded curved panel parts; hence, some geometrical imperfections emerge. Most of these imperfections are caused by the process of welding, transportation, inappropriate rolling, as well as installation and implementation problems. These imperfections have a direct impact on the structural behavior of shells during the buckling and external compressive load. Since in most shell tanks during operation, there is high possibility for the suction (vacuum) state, compressive forces in their thin wall cause buckling and failure. In this research, the imperfections made in steel cylindrical tanks being constructed in one of the refinery site are introduced and evaluated using a field study. Relying on the statistical inference, they are classified and then, by studying the effective factors and origin in their generation, the common imperfections are identified. Later, the impact of common imperfections on the buckling behavior is experimentally evaluated under uniform external pressure. Then, nonlinear numerical analysis of the test specimens is performed. Finally, experimental results, finite element and analytical relations are compared.","PeriodicalId":90573,"journal":{"name":"Journal of applied mechanical engineering","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2017-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4172/2168-9873.1000268","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43616183","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