Amirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101 The Quantification of Uncertainties in Production Prediction Using Integrated Statistical and Neural Network Approaches: An Iranian Gas Field Case Study The Quantification of Uncertainties in Production Prediction Using Integrated Statistical and Neural Network Approaches: An Iranian Gas Field Case Study1723410.22060/miscj.2009.234ENA.AbdollahzadehiM.HosseiniGh.ZargariiJournal Article20140316Uncertainty in production prediction has been subject to numerous investigations. Geological and reservoir engineering data comprise a huge number of data entries to the simulation models. Thus, uncertainty of these data can largely affect the reliability of the simulation model. Due to these reasons, it is worthy to present the desired quantity with a probability distribution instead of a single sharp value. <br />For the case-study, numbers of parameters which are believed to contribute largely the uncertainty of Field Gas Production Total are recognized. A sensitivity analysis was done to find the most significant initial parameters. Screening experiments are designed in order to recognize the main factors and the significant interactions of factors that we need to certainly include in the response function. Later, experiments of response surface are designed objective to model the response surface function of Field Gas Production Total. This has been done based on applying two methods, Response Surface Methodology and Artificial Neural Networks. The probability distribution of Total Field Gas Production was then plotted using Monte Carlo simulation.https://miscj.aut.ac.ir/article_234_07aa17d182ab9c17c0021186fea49811.pdfAmirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101Design, Modeling, and Construction of a New Tactile Sensor for Measuring Contact-ForceDesign, Modeling, and Construction of a New Tactile Sensor for Measuring Contact-Force91423510.22060/miscj.2009.235ENAliTavakoli GolpayganiiSiamakNajarianiiGoldisDarb EmamiehiiiJournal Article20140316This paper presents the design, modeling, and testing of a flexible tactile sensor and its applications. This sensor is made of polymer materials and can detect the 2D surface texture image and contact-force estimation. The sensing mechanism is based on the novel contact deflection effect of a membrane. We measure the deflection of the membrane with measuring the strain in the membrane with embedded strain gauge. It consists of a chamber and a membrane. Inner radius of the sensor element is 2 cm and its outer radius is 3cm. Furthermore, the size and shape can be easily tailored to the applications requirements. The proposed sensor with the potential for further miniaturization is suitable for using in medical applications, especially in minimally invasive surgery. https://miscj.aut.ac.ir/article_235_82718b2d4e0dbf9588b5492ce50c4079.pdfAmirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101Strength-Flow Parameters of Loose Silty Sands From Piezocone TestsStrength-Flow Parameters of Loose Silty Sands From Piezocone Tests152323610.22060/miscj.2009.236ENSeyed AbolhassanNaeiniMohammad HassanBaziarJournal Article20140316Piezocone penetration tests with dissipation phases are particularly useful for geotechnical site characterization. They also provide three independent readings with depth from a single sounding as well as time-rate information. In past investigations, only silty sands with specific silt content have been tested and complete sets of tests have not been conducted to evaluate the influence of different silt contents on CPTU results. In the present research, the complimentary CPTU tests with pore pressure dissipation phase and soil laboratory tests (including consolidation, permeability and triaxial tests) are also performed on silty sand samples with different silt content. In this study, six piezocone tests are performed in saturated silty sand samples with several different silt contents ranging from zero to 50 percent. The pore pressure dissipation tests are also carried out in samples and t<sub>50</sub> (the time for 50% pore pressure dissipation) is evaluated. Laboratory tests including consolidation, permeability and triaxial tests are also performed for the soil parameter determination. Based on the obtained results, the interrelationships among “K- t<sub>50</sub>”, “C<sub>v</sub> - t<sub>50</sub>” and “f'-q<sub>c</sub>” are finally presentedhttps://miscj.aut.ac.ir/article_236_3028bb93322a0d8e2b9263ad10f7fd77.pdfAmirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101Preliminary Site Selection of Pumped Storage Hydropower Plants - A GIS-based approachPreliminary Site Selection of Pumped Storage Hydropower Plants - A GIS-based approach253223710.22060/miscj.2009.237ENHassanAhmadiiAbolfazlShamsaiiiJournal Article20140316The first stage in development and design of Pumped Storage Hydropower Plants (PSHP) is finding the optimum location. This paper presents a methodology for preliminary site selection of PSHP with the help of geospatial data analysis in a Geographic Information System (GIS) environment. The conventional method of PSHP site selection has certain limitations and is not cost and time effective. The volume of data and the criteria for the site selection of PSHP causes a lot of difficulties for decision making. However, with the help of GIS as an information technology and with its analytical ability for decision making optimization, we can overcome these difficulties. Every criterion in a GIS can be illustrated as a separate data layer and site selection can be done according to the defined criteria. Overlay is one of the spatial functions that can combine spatial data layers from different sources for the site selection applications. In the process of site selection of suitable PSHP, various factors with different importance are considered.The Zayanderud pumped storage hydropower has been investigated as a case study. Suitable sites were identified based on spatial analysis in GIS environment. The Zayanderud PSHP is located in a dry and hot zone in central Iran and uses the existing Zayanderud dam lake as the lower reservoir. During this study, sites for upper reservoir location have been defined according to the artificial upper reservoir on the bank of the zayanderud reservoir. In this case study, at first, effective criteria for PSHP site location and corresponsive data layers have been defined. Then, data layers have been classified and prepared with respect to main criteria. Finally, results of overlay have been evaluated. The main factors used in PSHP site selection process were; development pattern (using existing lake, rivers, sea, natural and artificial pools, etc. as upper or lower reservoirs), head, conveyance length-head ratio, slope, power grid situation, roads accessibility, geology and other technical points of view. The above mentioned factors were entered in GIS as data layers. Results of this investigation indicate that by using GIS, more suitable sites can be selected and verified and the feasibility study process can be done in more precise manner. This method can save more time and cost compared to the conventional approach.https://miscj.aut.ac.ir/article_237_b4eb737aae37f83d421b6796a8922ddf.pdfAmirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101Evaluation of the Centre Manifold Method for Limit Cycle Calculations of a Nonlinear Structural WingEvaluation of the Centre Manifold Method for Limit Cycle Calculations of a Nonlinear Structural Wing334123810.22060/miscj.2009.238ENMortezaDardeliFiroozBakhtiari-NejadiiJournal Article20140316In this study the centre manifold is applied for reduction and limit cycle calculation of a highly nonlinear structural aeroelastic wing. The limit cycle is arisen from structural nonlinearity due to the large deflection of the wing. Results obtained by different orders of centre manifolds are compared with those obtained by time marching method (fourth-order Runge-Kutta method). These comparisons show zero, third and fifth order manifolds are very good approximation of this system. The aeroelastic model is a low aspect ratio rectangular cantilevered wing in a low subsonic flow which is structurally modeled by the Von Karman plate theory. A continuous time reduced order modified vortex lattice aerodynamics model is utilized in aerodynamics modeling.https://miscj.aut.ac.ir/article_238_59a430a154a5409c39ced8c2d80744da.pdfAmirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101Multiple Target Tracking With a 2-D Radar Using the JPDAF Algorithm and Combined Motion ModelMultiple Target Tracking With a 2-D Radar Using the JPDAF Algorithm and Combined Motion Model435123910.22060/miscj.2009.239ENAliakbarGorji DaronkolaeiiMohammad BagherMenhajAliDoostmohammadiJournal Article20140316Multiple target tracking (MTT) is taken into account as one of the most important topics in tracking targets with radars. In this paper, the MTT problem is used for estimating the position of multiple targets when a 2-D radar is employed to gather measurements. To do so, the Joint Probabilistic Data Association Filter (JPDAF) approach is applied to tracking the position of multiple targets. To characterize the motion of each target, two models are used. First, a simple near constant velocity model is considered and then to enhance the tracking performance, specially, when targets make maneuvering movements a variable velocity model is proposed. In addition, a combined model is also proposed to mitigate the maneuvering movements better. This new model gives an advantage to explore the movement of the maneuvering objects which is common in many tracking problems. Simulation results show the superiority of the new motion model and its effect in the tracking performance of multiple targets.https://miscj.aut.ac.ir/article_239_e2f12ceb43f684b36e991ec737cd42b5.pdfAmirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101Hybrid of Rationalized Haar Functions Method for Mixed Hammerstein Integral EquationsHybrid of Rationalized Haar Functions Method for Mixed Hammerstein Integral Equations535724010.22060/miscj.2009.240ENY.OrdokhaniiJournal Article20140316A numerical method for solving nonlinear mixed Hammerstein integral equations is presented in this paper. The method is based upon hybrid of rationalized Haar functions approximations. The properties of hybrid functions which are the combinations of block-pulse functions and rationalized Haar functions are first presented. The Newton-Cotes nodes and Newton-Cotes integration method are then utilized to reduce the nonlinear mixed Hammerstein integral equations to the solutions algebraic equations. The method is computationally attractive, and applications are demonstrated through illustrative examples.https://miscj.aut.ac.ir/article_240_c6a412aaf6b13aca66d963b4a00c6dfa.pdfAmirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101Effect of Alkali and Heat Treatment on Biomimetic HA Coating on Ti6Al4VEffect of Alkali and Heat Treatment on Biomimetic HA Coating on Ti6Al4V596324110.22060/miscj.2009.241ENK.FatehiiF.MoztarzadehiiM.Solati HashtjiniiiJournal Article20140316In this study, time of calcium phosphate formation on Ti6Al4V alloy with or without alkali and heat treatments was investigated. Specimens were soaked in 0, 5, 10 M solutions of NaOH at temperatures of 60 or 80 °C for 24, 72 h. Their surfaces were characterized using scanning electron microscopy and thin film X-ray diffraction. It was found that optimum condition is 72h soaking in 5 M NaOH in 80 °C. Specimens treated under these optimum conditions were subsequently heat-treated at 500, 600, and 700 °C for 1h in order to consolidate the sodium titanate hydrogel layer. With heat treatment at 600 °C for 1h and then soaking in simulated body fluid (SBF), apatite formed within 3 days. But there were no signs of apatite formation in control samples (without alkali and heat treatment) up to 7 days soaking in SBF. So, it was concluded that alkali-heat treatment is an effective way for accelerating apatite formation and the optimum condition is 72 h soaking in 5 M NaOH solution at 80°C and then heat treatment at 600 °C resulted for 1 h.https://miscj.aut.ac.ir/article_241_aa6183c61302d28ad6555114ac7922fd.pdfAmirkabir University of TechnologyAUT Journal of Modeling and Simulation2588-295341220091101On Infinitesimal Conformal Transformations of the Tangent Bundles with the Generalized MetricOn Infinitesimal Conformal Transformations of the Tangent Bundles with the Generalized Metric656924210.22060/miscj.2009.242ENE.PeyghaniA.TayebiiiJournal Article20140316Let be an n-dimensional Riemannian manifold, and be its tangent bundle with the lift metric. Then every infinitesimal fiber-preserving conformal transformation induces an infinitesimal homothetic transformation on . Furthermore, the correspondence gives a homomorphism of the Lie algebra of infinitesimal fiber-preserving conformal transformations on onto the Lie algebra of infinitesimal homothetic transformations on , and the kernel of this homomorphism is naturally isomorphic onto the Lie algebra of infinitesimal isometries of .https://miscj.aut.ac.ir/article_242_d586f0656d06ea7368807b15a11c19c2.pdf