Design and Simulation of all Optical/hybrid Neural Networks

, M.Sc. Thesis Sharif University of Technology Marzban, Mahmood Reza (Author) ; Khavasi, Amin (Supervisor)

Abstract

Analog computing has emerged as a promising candidate for Neural networks' implementation due to its high Interconnectivity, high bandwidth, parallel computing, high-speed processing, and low power consumption. Artificial Neural Networks have a wide range of applications; however, the Implementation of complicated Neural Networks on traditional computers would encounter two fundamental obstacles: limited processing speed and non-optimal energy consumption. This thesis's primary focus is on designing and simulating a whole-passive planar Optical neural network(ONN) based on silicon photonics technology. Firstly, the concept of ONN is studied using some lately proposed work. The device is...

Simulation and plant wide Control of Combined Pervaporation/Distillation Process for MTBE Production

, M.Sc. Thesis Sharif University of Technology mozegar, Mostafa (Author) ; Pishvaei, Mahmood Reza (Supervisor)

Abstract

In this thesis we are about to simulate and control an MTBE production unit which use membrane instead of azeotropic distillation tower. At first an MTBE Production Unit with two distillation towers in separation part is simulated whit traditional method. One of these distillation towers is azeotropic. Then azeotropic distillation tower is replaced with membrane.After simulation the unit with best process indicators is selected. The goal is minimization of fixed and operating costs.In the next stage the best control loops in each unit is selected. The unit with best control indicators is determined. Control indicators are load rejection and set point tracking. All units have been simulated...

Comparative Study of Two PWC Methodologies on HDA Process

, M.Sc. Thesis Sharif University of Technology Poorazimi, Sina (Author) ; Pishvaie, Mahmood Reza (Supervisor)

Abstract

Plantwide control plays a significant role in both industrial and academic fields. In this work, two plantwide control methodologies, “Self-Optimiaing Control (SOC)” and “Integrated Framework of Simulation and Heuristic (IFSH)”, have been applied on toluene hydrodealkilation process. Consequently, the performance of each methodology has been evaluated and compared due to the same process disturbance scenarios.The results are as follows: Although self-optimiaing control includes lots of optimization efforts, dynamic performance of the plant dose not exhibit notable differences. Therefore, Integrated framework of simulation and heuristic methodology is preferable for hydrodealkilation...

Dynamic Simulation of Liquid Direct Methanol Fule Cell

, M.Sc. Thesis Sharif University of Technology Akbarpoor Boroojeni, Behrouz (Author) ; Pishvaei, Mahmood Reza (Supervisor)

Abstract

Cell of fuel methanol can store fuel easily, because they can suitable for resources of energy with ambulant applications. As for with the extensive of electrical haul instruments, they attention to the use of fuel cell methanol. In this project a fuel cell methanol consist of different branches such as cathode, Anode, substrates of membrane and influx, has modeled with the form of flat three dimensional. This model consist of ambulant theorems, transfer of mass, chemistry theorems and reflexes of electro chemistry in spongy environment. As for with a little knowledge that is related to the oxidation of methanol, the first research is related to this reflex and the knowledge of mathematic...

Model Predictive Control Based on Hybrid Neural Networks of a Fedbatch Yeast Production Fermenter

, M.Sc. Thesis Sharif University of Technology Faramarzi Babadi, Alireza (Author) ; Pishvaie, Mahmood Reza (Supervisor)

Abstract

Due to underlying dynamic factors, many bioprocesses operate in semi-batch or batch processes without fixed points of operation. As a result, linear model-based control is not straightforward for these processes. Additionally, optimal policy design and successful control of constrained systems depend on having an appropriate dynamic model within the process scope. In bioprocessing, synthesizing and controlling such dynamic models presents numerous challenges, as most relationships are quasi-monod and involve parameter estimation from nonlinear reactor data. One approach to addressing this issue is using black box models like neural networks. However, employing purely artificial neural...

Design of a Sliding Mode Observer to Estimate the Charge of Vanadium Redox Flow Batteries

, M.Sc. Thesis Sharif University of Technology Kharazmi, Amir Arsalan (Author) ; Pishvaie, Mahmood Reza (Supervisor)

Abstract

One of the main challenges in managing flow batteries usage is estimating their state of charge. Since The concentration of ions in the battery indicates the battery's charge and, on the other hand, the sensors for measuring the concentration are expensive, observers should be used to estimate the concentrations of the ions in the battery. This work is done by measuring the cell voltage, and finally, using the mathematical model of the battery, the amount of concentrations and state of charge is calculated. In this work, a vanadium flow battery was initially modeled accurately and mechanistically using COMSOL software to replace an actual flow battery in subsequent studies. Also, two...

Positioning and tracking control of an amphibious single wheel robot

, Article 2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008, Boston, MA, 31 October 2008 through 6 November 2008 ; Volume 11 , 2009 , Pages 545-551 ; 9780791848722 (ISBN) Marzban, M ; Alizadeh, D ; Sharif University of Technology

2009

Abstract

Amphibious single wheel robot consists of a sharp-edged wheel actuated by a spinning flywheel for steering and a drive motor for propulsion. The spinning flywheel acts as a gyroscope to stabilize the robot and also can be tilted to achieve steering. In this paper, the kinematics of a single wheel robot in water, Gyrover, is analyzed and then a simple mechanism for driving it is proposed. In previous studies, Lagrange approach is used for hydrodynamic modeling of the robot. A nonlinear position controller is designed to bring the robot to any desired position. Based on the designed controller, a tracking controller is augmented to the robot. For simplicity the added mass effect has been...

Stability control of an Amphibious single wheel robot

, Article ASME International Mechanical Engineering Congress and Exposition, IMECE 2007, Seattle, WA, 11 November 2007 through 15 November 2007 ; Volume 9 PART B , 2008 , Pages 1465-1472 ; 0791843033 (ISBN); 9780791843031 (ISBN) Marzban, M ; Alasty, A ; Sharif University of Technology

2008

Abstract

Single wheel robots are typically those kinds of robots which contain all the necessary mechanizations, namely the stabilization and driving mechanizations, within a shell-liked housing appearing analogous to a wheel. These robots have proved to be useful in various fields of industry due to their advantages of giving high instant acceleration and maintaining high cruise speeds for considerable amount of time in addition to being compact and small. It is a sharp-edged wheel actuated by a spinning flywheel for steering and a drive motor for propulsion. The spinning flywheel acts as a gyroscope to stabilize the robot and it can be tilted to achieve steering. In this paper first the kinematics...

Dynamic anlysis of an amphibious single wheel robot part1: Moving in straight path

, Article 31st Mechanisms and Robotics Conference, presented at - 2007 ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2007, Las Vegas, NV, 4 September 2007 through 7 September 2007 ; Volume 8 PART B , 2008 , Pages 927-932 ; 0791848027 (ISBN); 9780791848029 (ISBN); 0791848094 (ISBN); 9780791848098 (ISBN) Marzban, M ; Alasty, A ; Sharif University of Technology

2008

Abstract

A single wheel, gyroscopically stabilized robot is a sharpedged wheel actuated by a spinning flywheel for steering and a drive motor for propulsion. The spinning flywheel acts as a gyroscope to stabilize the robot and it can be tilted to achieve steering. In this paper first the kinematics of a single wheel robot, like Gyrover, in water is considered and then a simple mechanism for its movement in water is proposed. After hydrodynamic analysis of the robot a complete dynamics model is designed with Lagrange energy method. The only simplification used here is neglecting the added mass effect in hydrodynamic analysis. This complete model can be used for examining the behavior of the robot in...

Optimization and Implementation of Detection and Control Algorithms in an APF

, M.Sc. Thesis Sharif University of Technology Marzban, Mohammad (Author) ; Mokhtari, Hossein (Supervisor)

Abstract

Today, with the increasing use of non-linear loads in the power grid, power quality problems such as current harmonics, unbalance and reactive power have intensified. It is common to use active power filters to solve these problems. In order to justify the use of active filter, two approaches can be adopted. On the one hand, by increasing the active filter capability such as simultaneous harmonic compensation, umbalance and reactive power by one device, the filter capabilities increased. On the other hand, it reduced the final cost of the active filter. In this research, firstly, a comprehensive hardware structure for various compensation applications is presented. This is done with the aim...

Investigation and Simulation of near Wellbore Damage Effect on Reservoir Fluid Flow

, M.Sc. Thesis Sharif University of Technology Shams, Mosayeb (Author) ; Jamshidi, Saeed (Supervisor) ; Pishvaei, Mahmood Reza (Co-Advisor)

Abstract

Many petroleum engineering operations, such as drilling, well completions, and workover, may cause an alteration in the properties of hydrocarbon-bearing formations, including porosity and permeability. Solid and fluid influx into the reservoir in an overbalanced pressure condition can cause permeability reduction from formation damage in the invaded zone. While the solid invasion is limited to a few inches away from the wellbore, the fluids will invade significantly deeper into the formation. Therefore, the invasion of fluids may be considered as the primary mechanism that causes the near-wellbore damage. Correct quantification of the damage is an important component for predicting well...

Cryptanalysis of Lightweight Primitives and Protocols

, Ph.D. Dissertation Sharif University of Technology Ahmadian, Zahra (Author) ; Salmasizadeh, Mahmood (Supervisor) ; Aref, Mohammad Reza (Supervisor)

Abstract

Lightweight cryptography is a new area in cryptography developed as a solution to the security requirements in pervasive, low cost and lightweight systems, such as RFID networks. Due to the pervasive nature of these systems, the users’ privacy is seriously threatened while severe restrictions are imposed on computational, memory and power resources. Therefore, the conventional design rules of cryptographic primitives and protocols are not accountable here and the designers have adopted innovative methods for lightweight designs. This makes the design of a lightweight primitive/protocol a very challenging and sensitive task which is not still reliable enough. Such a trust can not be made...

Wideband and multi-band frequency selective surfaces for microwave shielding

, Article 29th Iranian Conference on Electrical Engineering, ICEE 2021, 18 May 2021 through 20 May 2021 ; 2021 , Pages 836-842 ; 9781665433655 (ISBN) Marzban, M. R ; Alighanbari, A ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2021

Abstract

Monolayer band-reject frequency selective surfaces (FSS) based on curved coupled microstrip line (CCML) resonators are proposed. Each unit cell comprises a single- or multi-loop CCML resonator, featuring single-wideband or multi-band resonance, respectively. Design guidelines for achieving various responses are demonstrated and it is shown there is a great flexibility attaining desired frequency responses versus structural parameters. For instance, it is shown that the entire microwave X-band may be rejected, using a simple single-loop structure. The FSS is particularly useful for protecting buildings against parasitic microwave signals. A visual transparency factor for the FSS, when regular...

Estimation of Springback in Sheet Metal Stamping Using Inverse Finite Element Method

, M.Sc. Thesis Sharif University of Technology Marzban, Bahador (Author) ; Asempour, Ahmad (Supervisor)

Abstract

This work presents a quick method in estimation of spring back effect in sheet metal forming. In this method, the so called Inverse Finite Element Method (IFEM) has been adopted for compution of strains and also blank shape. Although the of element used is membrane, the effect of bending/ unbendiing is considered by addition of some extra forces as the bending forces to the nodal forces. The results of strain distribution obtained by IFEM are applied to another algorithm developed for computation of the spring back . this algorithm has been developed for the sections with plane starin assumption. Therefore, spring back of longitudinal parts, can be estimated by this method in a short time....

Pore Scale Simulation of the Fluid/Fluid and Fluid/Rock Interactions on the Performance of Water Injection

, M.Sc. Thesis Sharif University of Technology Mousavi, Mohammad Javad (Author) ; Fatemi, Mobin (Supervisor) ; Pishvaie, Mahmood Reza (Co-Supervisor)

Abstract

Two-phase fluid flow physics in porous media is applied in various fields. Studies have shown that wettability and surface tension, which represent fluid-rock and fluid-fluid interactions, have a significant effect on the dynamics of the immiscible displacement. Although the effects of wettability and surface tension on the macroscopic behavior of fluid flow are known, there is less understanding of it at the micro scale. Considering the essential role of wettability and surface tension in various fields, this project seeks to investigate the effects of wettability and surface tension on the movement and distribution of fluids and the dominant displacement mechanisms within the porous media...

Multiscale Finite-Volume Simulation of Multi Phase Flow in Heterogeneous Porous Media

, M.Sc. Thesis Sharif University of Technology Karimyan, Erfan (Author) ; Pishvaie, Mahmood Reza (Supervisor) ; Taghizadeh Manzari, Mehrdad (Supervisor)

Abstract

Multi-Scale finite volume (MSFV) method have been developed and applied for multiphase flow in porous media. The most important advantage of MSFV method is its computational efficiency. In this thesis we apply and implement this method to porous media simulation. Then, computational parameters such as coarsening ratio, effect of threshold on adaptive computation and different boundary conditions for computing basis functions are investigated. The two difficulties of sMSFV method are problems with high permeability contrast and problems with high course grid aspect ratio which are considered. In standard MSFV (sMSFV) method reduced boundary condition is used to determine the basis and...

Gas Fermentation Development Using Flux Balance Analysis

, Ph.D. Dissertation Sharif University of Technology Sohrabi Shoabjareh, Ali (Author) ; Farhadi, Fathollah (Supervisor) ; Pishvaie, Mahmood Reza (Supervisor)

Abstract

In this thesis, a typical dynamic model of syngas fermentation, refered as hybrid method for biofuels production, coupled with a distillation column is developed in SimDFBA. The bioreactor is simulated in MATLAB/Simulink by using Clostridium ljungdahlii acetogenic micro-organism metabolic network. Bioreactor modeling is accomplished with a bubble column reactor in both liquid and gas phases, while the separator was simulated with ASPEN. PDE equiations of bioreactor modeing are dicretized to ODE equation by using QUICK scheme of finite volume method. A new econometric optimization study for outlet gas purification through a pressure swing adsorption unit to recycle relatively pure hydrogen is...

A new method for the solution of hybrid analog digital beamforming problems

, Article Optimal Control Applications and Methods ; Volume 41, Issue 5 , 2020 , Pages 1735-1748 Amini, E ; Reza Marzban, H ; Rastegari, M ; Sharif University of Technology

John Wiley and Sons Ltd 2020

Abstract

By going to millimeter wave (mmWave) we can use large scale MIMO due to short mmWave wavelength to overcome path loss by using beamforming to focus power of signal to the receiver. System structure of mmWave band is different with conventional MIMO because of large scale MIMO which is leading to use many RF-chains. For this reason Hybrid structure have been proposed for large Scale MIMO. By going to Hybrid structure a new issue has been created with phase shifter constraint. In this paper we propose a novel solution to make a hybrid precoding and combing to reach high spectral efficiency. Our problem includes a maximizing Frobenius norm of multiplying five complex matrices. As constraints,...

Static Melt Crystallizer Simulation and Design with CFD

, M.Sc. Thesis Sharif University of Technology Karimzadeh Sureshjani, Hamed (Author) ; Farhadi, Fathollah (Supervisor) ; Pishvaei, Mahmood Reza (Supervisor)

Abstract

Layer melt crystallization is one of the most attractive and productive separation methods in the chemical industry. One of the most important coal tar components, which is present in concentration between 10 to 12% is naphthalene. One of the most commonly used techniques for producing naphthalene crystallization. In this thesis, the layer melt crystallization in a mixture of naphthalene and benzothiophene has been investigated using computational fluid dynamics. The simulation of crystallization was performed in Comsol Multiphisics version 5.6 and the thickness of the crystal layer was obtained according to the time. At first, simulation results were verified with the labroratory results of...

Smart Water Optimal Injection Policy in Fractured Carbonate Reservoirs, Using Laboratory Data

, Ph.D. Dissertation Sharif University of Technology Madadi Mogharrab, Javad (Author) ; Ayatollahi, Shahaboddin (Supervisor) ; Pishvaie, Mahmood Reza (Supervisor)

Abstract

Wettability alteration is the main mechanism for enhancing oil recovery in carbonate reservoirs during low salinity or engineered water flooding (LS/EWF), though it is a complex process due to the high heterogeneity of rock. During LS/EWF, wettability alteration occurs as a result of electrochemical interactions at the interface between carbonate rock and brine. One of the most critical factors affecting these interactions, and the wettability alteration process, is the presence of anhydrite impurities in the carbonate rock. Therefore, the success of LS/EWF in carbonate reservoirs lies on understanding the role of impurities like anhydrite from both geochemical and dissolution perspectives....