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    Effect of cyclic loading on the temporomandibular joint

    , Article Lecture Notes in Engineering and Computer Science ; Volume 1 , 2014 , Pages 655-658 ; ISSN: 20780958 ; ISBN: 9789881925275 Muhandiram, J ; Wang, B ; Chizari, M ; Sharif University of Technology
    This research is aiming to investigate the mechanical behaviour of the temporomandibular joint (TMJ), in response to kinematics/cyclical loading caused through actions of speech and mastication. A set of in-vitro experimental tests has been performed in three different groups on a fresh sheep jaw bone to examine the hypothesis of the study. No failure was monitored during the cyclical test. The study was concluded that the amount of loading is effective on the displacement of the TMJ  

    A 3-D inductive powering approach dedicated to implantable/wearable biomedical microsystems

    , Article IEEE 2014 Biomedical Circuits and Systems Conference, BioCAS 2014 - Proceedings ; oct , 2014 , p. 424-427 Sendi, M. S. E ; Nasiri, S ; Mousavi, N ; Sharifkhani, M ; Sodagar, A. M ; Sharif University of Technology
    This paper proposes a new coil structure for inductive powering to wearable/implantable biomedical devices. This structure is virtually independent from the direction (and alignment) of the receiving coil relative to the transmitting coil. In addition to conducting experimental tests and characterizations, the proposed coil structure (energized by a transmitting coil) has been used to power up a real test system designed for wireless neural recording, operating at 1.2V and drawing 48 mW  

    Impulse waves effects on coastlines and onshore industrial structures

    , Article Proceedings of the 5th International Conference on Asian and Pacific Coasts, APAC 2009, 13 October 2009 through 16 October 2009 ; Volume 4 , 2010 , Pages 29-36 ; 9789814466561 (ISBN) Najafi Jilani, A ; Ataie Ashtiani, B ; Sharif University of Technology
    Laboratory investigations have been performed on impulse wave's effects near the coastlines such as shoaling effects and run-up. Wave run-up over on smooth impermeable slope are studied in over than 100 experimental tests. The influences of the bed slope angle, incident impulse wave height and still water depth are investigated. The available empirical equations for impulsive wave run-up have been examined by comparison with the collected experimental data. A new equation has been presented for run-up estimation based on the laboratory measurements. It has been compared with others empirical equations and the differences have been discussed. The shoaling effects on the impulse wave feature... 

    Design, Construction and Testing of a Turbojet Engine by Using a Turbocharger

    , M.Sc. Thesis Sharif University of Technology Beyrami, Mehdi (Author) ; Hajilouy Benisi , Ali (Supervisor)
    Turbojet engines are used widely in the aviation industry due to very high specific thrust. The design and manufacture of turbojet components are complex procedures and needs high technology. In this M. S.c Thesis, the structur and function of a turbojet engine are described. then all stages of design,manufacture ,test and control of a small turbojet engine which is developed by use of a turbocharger are specified. the design and construction of combustion chamber, exhaust nozzle, lubrication system, thrust measurement system, data acquisition system, fuel and ignition system ,control system and etc are carried out at Sharif University of Technology gas turbine laboratory. The one... 

    The wide-open three-legged parallel robot for long-bone fracture reduction

    , Article Journal of Mechanisms and Robotics ; Volume 9, Issue 1 , 2017 ; 19424302 (ISSN) Abedinnasab, M. H ; Farahmand, F ; Gallardo Alvarado, J ; Sharif University of Technology
    American Society of Mechanical Engineers (ASME)  2017
    Robotic reduction of long bones is associated with the need for considerable force and high precision. To balance the accuracy, payload, and workspace, we have designed a new six degrees-offreedom three-legged wide-open robotic system for long-bone fracture reduction. Thanks to the low number of legs and their nonsymmetrical configuration, the mechanism enjoys a unique architecture with a frontally open half-plane. This facilitates positioning the leg inside the mechanism and provides a large workspace for surgical maneuvers, as shown and compared to the well-known Gough-Stewart platform. The experimental tests on a phantom reveal that the mechanism is well capable of applying the desired... 

    Optimization of Centrifugal Compressor Blades with Experimental Investigation

    , M.Sc. Thesis Sharif University of Technology Poursadegh, Farzad (Author) ; Hajilouy Benisi, Ali (Supervisor)
    In this research, a novel quasi-3D design method is developed for the centrifugal compressor impeller on the blade-to-blade plane. In this method, an iterative inverse design method called Ball-Spine Algorithm (BSA) is incorporated into the quasi-3D analysis code solving the Euler equations on the blade-to-blade and meridional planes at each shape modification step. In design procedure, the difference between the target and current pressure distribution along the suction or pressure sides of the impeller causes the blade-to-blade profile to be changed and the target pressure distribution to be satisfied. In order to validate the quasi-3D analysis code, the centrifugal compressor of a gas... 

    Flexural Behavior of Concrete Beams Reinforced with High Volume Steel Fibers

    , M.Sc. Thesis Sharif University of Technology Sedaghat Jahromi, Hooman (Author) ; Khaloo, Alireza (Supervisor)
    In recent years, the use of fibers has found considerable attention in concrete structures as in spillways, basins of dams, shell structure, industrial floors, and bridge pedestrians. Fibers modify the brittle nature of concrete and make the composite behave ductile under various types of loading. Fibers have numerous advantages such as higher impact resistance, less shrinkage, smaller crack width, higher durability and low expense for repair and maintenance.
    Till now, no adequate data has been reported on concrete beams reinforced with high volume fiber. In this study, flexural behavior of concrete beams reinforced with high volume steel fibers is experimentally investigated. Concrete... 

    Dynamics Modeling and Linear Controller Design of Marin Vehicles

    , M.Sc. Thesis Sharif University of Technology Khodaei, Mohammad Javad (Author) ; Seif, Mohammad Saeed (Supervisor) ; Banazadeh, Afshin (Co-Advisor)
    In recent years, autonomous underwater vehicles have had an increasing role in underwater investigations. These vehicles are used in various fields, including military applications, commercial uses or scientific investigates and also mapping purposes. The test and the fabrication of these kind of vehicles are very costly and time-consuming because of not only the risk of losing the vehicle due to the various computerized errors, but also as a result of the costs of supporting staff, equipment and the structure of a process. As a result of the environment where these vehicles do their missions, there is a crucial need of control methods which have enough accuracy as well as robustness against... 

    Experimental Study of a Side Intake in Transonic Speed

    , M.Sc. Thesis Sharif University of Technology Dehghan, Saeed (Author) ; Farahani, Mohammad (Supervisor)
    This study aims to evaluate aerodynamic coefficients of an airplane with air breathing engine experimentally. In these experiments, an ejector is used to better simulate flying conditions and aerodynamic interferences generated in inlet and exhaust engine. Therefore, at first, an ejector was designed for simultaneous simulation of exit cold flow and inlet flow of engine. All tests were conducted at QRC Trisonic wind tunnel and at Mach number of 0.5 to 0.85, angles of -4 to 6 deg. and for various amounts of pressure ejector and control surfaces angles. Finally, for the Mach number of 0.5, effect of roughness on the aerodynamic coefficients was examined. The results showed that, drag... 

    Experimental Investigation of the Effect of the Bleed Slant Angle on the Performance and Stability of a Supersonic Air Intake

    , M.Sc. Thesis Sharif University of Technology Abedi, Mahdi (Author) ; Soltani, Mohammad Reza (Supervisor)
    In the study of supersonic air intakes, two important issues including performance and stability are considered. In these types of intakes, when inlet mass flow rate is reduced to a specified amount, a self-sustained instability called Buzz phenomenon occurs. During this phenomenon, shocks and expansion waves oscillate ahead of the intake that will degrade the performance considerably due to the periodic pressure fluctuations inside the intake. In the current study, a supersonic axisymmetric air intake with mixed compression which has designed for a free stream Mach number of 2.0 has been tested were conducted for free stream Mach numbers of 1.8, 2.0, and 2.2, and the results were analyzed... 

    Fabrication and Mathematical Modelling of a Novel Loop Heat Pipe for the Purpose of Operating Temperature Control

    , Ph.D. Dissertation Sharif University of Technology Khalili, Mohammad (Author) ; Shafii, Mohammad Behshad (Supervisor)
    A Loop heat pipe (LHP) is an efficient two phase heat transfer device that is widely used in cooling applications. In this research a novel LHP was designed, fabricated and its performance was investigated through various experiments. The novel LHP has a new arrangement in evaporator and reservoir configuration in comparison with conventional LHPs, which results in a different energy and fluid flow. In addition, the novel LHP has a new mechanism for active control of working temperature which was not already used. Aside from its good performance, this LHP has easier and lower cost manufacturing process compared with the conventional ones. Also the proposed temperature control method is... 

    Modeling of Turbojet Propulsion Performance and Experimental Validation

    , Ph.D. Dissertation Sharif University of Technology Pourfarzaneh, Hossein (Author) ; Hajilouy Benisi, Ali (Supervisor) ; Farshchi, Mohammad (Supervisor)
    The propulsion system plays a significant role in determining of mission and flight regime of an air craft. This system, provides the propulsion force for an air craft. A comprehensive model based on the specifications of gas turbine cycle, with acceptable accuracy, is necessary for quick estimating of the engine performance in different phases of design and development of a propulsion system. The structure and performance of the turbojet engine is elaborated in this project and the previous researches and their simulating methods of the turbojet engine are reviewed. The research plan is justified by explanation of the project’s objects and its assumptions. Then, the zero-dimensional... 

    Experimental Study the Effect of Control Surface on High speed Vessels Maneuvering in Calm Water

    , Ph.D. Dissertation Sharif University of Technology Hajizadeh, Sajjad (Author) ; Seif, Mohammad Saeed (Supervisor) ; Mehdigholi, Hamid (Supervisor)
    Design optimization of ships by taking maneuverability in account has great influence on the performance of the vessels. Thus providing a method to predict the behavior of vessel in the design process is very important. Ship maneuverability is remarkable from different aspects of view. Especially in high speed vessels of various applications and missions’ good maneuverability would be a positive rating for it. For example, military vessels in specific situations need to change the speed and direction and this is a crucial capability of them. Also in accordance to the rules of IMO all of the vessels should perform maneuvering trials and fulfil the minimum requirements. Accordingly, this issue... 

    Lifetime Prediction of Rolling Element Bearings using Adaptive Algorithms Based on their Vibration Trends

    , M.Sc. Thesis Sharif University of Technology Alandi Hallaj, Ahmad (Author) ; Behzad, Mehdi (Supervisor)
    Rolling element bearings are the most widely used components in rotating machinery and so, estimation of their remaining useful lifetime in order to increase the reliability and availability of them is a critical issue in the field of condition monitoring of these machinery. Despite numerous researches which have tried to develop a model for precise prediction of rolling element bearings’ lifetime, there is no method which can predict their remaining lifetime exactly. The failure criterion in these components is the area of defect in their races and rolling elements. Consequently, an approach which can predict the defect area of these components is susceptible to prediction of their... 

    Failure Analysis in Conical Structures Made by Tape Winding Method under Cold and Hot Thermal Load

    , M.Sc. Thesis Sharif University of Technology Karimian, Mehdi (Author) ; Hosseini Kordkheili, Ali (Supervisor) ; Parviz, Hadi (Co-Supervisor)
    The aim of this study is numerical simulation of progerasive failure in conical structures that manufactured by tape-winding proceses in various temperatures. For this purpose, flat laminates by tape-winding proceses firstly manufactured using carbon/phenolic prepreg tape. Then tensile, compression, shear and thermal expansion coefficient specimens are cut from these laminates. Tensile and compression test are done on these specemens in fiber and matrix directions in temperature range 23-200℃ and stress-strain and stress-time curves are achavied. Using these curves tensile elastic modulus in fiber and matrix directions and Poisson's ratio are obtained in room temperature. Also tensile and... 

    Design and Manufacturing of Water Jet Apparatus for Cutting Soft Tissue and Interaction Analysis

    , M.Sc. Thesis Sharif University of Technology Vatani, Pouyan (Author) ; Ahmadian, Mohammad Taghi (Supervisor) ; Assempour, Ahmad (Supervisor)
    Cancer is one of the deadliest diseases of the modern era and accounts for 13% of all deaths in humans. Most cancers and lesions in the human body are related to soft tissue. Many soft-tissue cancers and lesions occur in sensitive areas of the body, such as the brain, pituitary, and intestine. The pituitary gland is located in the human head and near the optic nerves. Surgery in a typical way can result in risks such as heat loss of the optic nerve or injuries to healthy tissues due to the sharpness of the surgery tool. One of the alternatives to conventional surgery is water jet surgery. This method minimizes the risks of human error. In the present study, a water jet machine was designed... 

    Fatigue Life Investigation of Titanium Specimens Fabricated by 3D Printers

    , M.Sc. Thesis Sharif University of Technology Dehghan Manshadi, Amir (Author) ; Adibnazari, Saeed (Supervisor)
    In various industries such as aerospace, biomedicine and automobile manufacturing, they seek to manufacture light parts with complex geometry and acceptable mechanical properties. Additive manufacturing processes have gained a special place in the field of rapid prototyping, reverse engineering, mold production, etc. brought It is very important to know the mechanical properties, especially the fatigue behavior of the parts obtained by this method. In this research, the stress-fatigue life graph of parts made of Ti-6Al-4V (grade 5), which is one of the most widely used alloys in aerial structures, was extracted by selective laser melting. For this purpose, several standard fatigue test... 

    Optimization of A Centrifugal Compressor And Its Validataion With Exprimenatla And Numerical Results

    , M.Sc. Thesis Sharif University of Technology Karrabi, Hadi (Author) ; Hajilouy Benisi, Ali (Supervisor)
    The actual flow stream through compressor is 3D and fluctuated because of complicated geometry, fluid viscosity and high velocity. Therefore, more accurate analysis of this kind of flow, it is better to use 3D model. Nowadays the flow modeling software are able to model and analysis flow regime using numerical methods in three dimensions. Using these software allow us to find the ways which can reduce the energy losses to improve compressor efficiency.In current work, based on 3D numerical analysis, the flow regime in a centrifugal compressor is investigated and also the sensitivity of this analysis with mesh sizing is explored. The k-e type RNG model is used for modeling turbulent behavior... 

    Experimental and Numerical Investigation the Effect of Geometry on Hydrodynamic Performance in Surface Piercing Propeller

    , Ph.D. Dissertation Sharif University of Technology Teimouri Rabor, Mahdi (Author) ; Seif, Mohammad Saeed (Supervisor)
    Due to the suitable performance characteristics and the widespread use of Surface Piercing Propellers (SPPs) in high-speed crafts, many experiments and numerical studies have been conducted in this field. Due to the lack of a comprehensive series similar to conventional propellers in the field of SPPs, in this thesis, it has been tried to personalize the suitable basis by conducting two separate experimental tests in the National Iranian Maritime Laboratory (NIMALA) towing tank and the cavitation tunnel at Sharif University using computational fluid dynamics method and the commercial code STAR-CCM+. For this purpose, a wide range of phenomena and effective parameters on hydrodynamic... 

    Nanocar and nanotruck motion on gold surface

    , Article 1st International Conference on Manipulation, Automation and Robotics at Small Scales, MARSS 2016, 18 July 2016 through 21 July 2016 ; 2016 ; 9781509015108 (ISBN) Nemati, A. R ; Nejat Pishkenari, H ; Meghdari, A ; Shorabpour, S ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc 
    In this paper we have studied the motion of a nanocar and nanotruck on gold substrate using the classical molecular dynamics method. Analyzing the motion regime of the nanocar at different temperatures is one of the main goals of this paper. In the past years, similar molecules such as Trimmer, Z-car and nanotruck have been simulated by Konyukhov and Akimov. To increase the modeling accuracy in this paper we have used classical molecular dynamics contrary to previous works which used a rigid body molecular dynamics method. The result of our simulations were compared qualitatively to the experimental tests performed by Zhang et al. [12]. There was a good agreement between the results achieved...