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    Optimal design and fabrication of "CEDRA" rescue robot using genetic algorithm

    , Article 2004 ASME Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Salt Lake City, UT, 28 September 2004 through 2 October 2004 ; Volume 2 A , 2004 , Pages 541-548 Meghdari, A ; Pishkenari, H. N ; Gaskarimahalle, A. L ; Mahboobi, S. H ; Karimi, R ; Sharif University of Technology
    American Society of Mechanical Engineers  2004
    This article presents an overview of the mechanical design features, fabrication and control of a Rescue Robot (CEDRA) for operation in unstructured environments. As a preliminary step, the essential characteristics of a robot in damaged and unstable situations have been established. According to these features and kinematical equations of the robot, design parameters are optimized by means of Genetic Algorithm. Optimum parameters are then utilized in construction. Upon fabrication, this unit has been tested in clean laboratory environment, as well as, ill-conditioned arenas similar to earthquake zones. The obtained results have been satisfactory in all aspects, and improvements are... 

    Optimization of engine mount characteristics using experimental/numerical analysis

    , Article JVC/Journal of Vibration and Control ; Volume 9, Issue 10 , 2003 , Pages 1121-1139 ; 10775463 (ISSN) Foumani, M. S ; Khajepour, A ; Durali, M ; Sharif University of Technology
    In this paper an experimental/numerical technique is developed for engine mount optimization. The method is general and can be applied to optimize active and passive vibration isolators or absorbers in any mechanical systems or civil structures. Engine mount optimization techniques mostly rely on an accurate mathematical model of the whole vehicle, which in most cases is not available or is too difficult to develop. As a result, the current approach for selecting engine mounts for a vehicle is based upon trial and error which is very time-consuming and expensive. The proposed technique counts upon experimental data for optimization and does not require any mathematical model of the vehicle... 

    Transient modeling of dual fuel catalytic converter

    , Article Iranian Journal of Science and Technology, Transaction B: Technology ; Volume 27, Issue 2 , 2003 , Pages 291-298 ; 03601307 (ISSN) Sallamie, N ; Kazemeini, M ; Badakhshan, A ; Soltanieh, M ; Estiri, M ; Sharif University of Technology
    Exhaust gas emissions from mobile sources and its importance in urban pollution have currently attracted lots of interests towards studying on alternative fuel systems for road vehicles usage. One of the best replacements is the natural gas/diesel dual fuel, which offers an alternative to standard compression-ignition diesel engines. In the dual fuel system the primary fuel is natural gas, which may replace as much as 90% of the diesel fuel with a small amount of diesel fuel required ensuring effective ignition. Methane, the main constituent of natural gas, has high combustion efficiency. Dual fuel engines produce lower NOx emissions and fewer particulates. However, at moderate engine loads,... 

    Percolation theory in reservoir engineering

    , Book King, P. R ; Masihi, Mohsen
    World Scientific  2018

    Analysis of Value Engineering in Construction Projects with Executive Solutions - Including a Case Study

    , M.Sc. Thesis Sharif University of Technology Fatemi, Mohammad Ali (Author) ; Mostafavi, Mostafa (Supervisor)
    This research represents findings about obstacles in using value engineering in construction projects of khorasan razavi province via collection of information and views of experts of value engineering.The research shows that the value engineering in the majority of the projects is not practiced and majority of the projects are not benefited from this technique. Many experts believe that lack of required culture and motivation to save up and lack of organisational position for this technique are the main factors for non-progressive use of assessment engineering.The absence of proper understanding of the objectives and place of the value engineering is also an effective factor of on its... 

    Sensitivity analysis of gas turbine fuel consumption with respect to turbine stage efficiency

    , Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) ; Volume 1 , 2012 , Pages 419-423 ; 9780791845172 (ISBN) Zeinalpour, M ; Mazaheri, K ; Irannejad, A ; Sharif University of Technology
    In this paper, the effect of turbine stage efficiency on fuel consumption of both gas turbines and aerial engines is assessed quantitatively. At the beginning of the gas generator optimization to decrease the fuel consumption, it is necessary to analyze the sensitivity of fuel consumption to its main components efficiencies. This will guide us which component is more important to be optimized. Here a zero-dimensional analysis has been done to determine the effect of turbine stage efficiency on the fuel consumption. Results of this analysis are evaluated in the context of thermodynamic cycle of a gas turbine generator and an aerial engine. As an example, it is shown that if the efficiency of... 

    Predicting probabilistic distribution functions of response parameters using the endurance time method

    , Article Structural Design of Tall and Special Buildings ; 2018 ; 15417794 (ISSN) Mashayekhi, M. R ; Mirfarhadi, S. A ; Esmaeilpour Estekanchi, H ; Vafai, H ; Sharif University of Technology
    John Wiley and Sons Ltd  2018
    The main objective of this study is the development of endurance time (ET) excitations in order to take structural response uncertainty into account for use in performance-based earthquake engineering. There are several uncertainties in earthquake engineering, including earthquake occurrence, structural response, damage, and loss. In the current research, structural response uncertainty is directly included in the ET method, which is an analysis method used for performing structural behavior assessment under seismic actions. Conventional practice of the ET method does not provide any information about seismic response distribution. Despite the simplicity of the ET method, it is an accurate... 

    Experimental modeling of air temperature and velocity distribution in an engine compartment

    , Article 2006 2nd ASME Joint U.S.-European Fluids Engineering Summer Meeting, FEDSM 2006, Miami, FL, 17 July 2006 through 20 July 2006 ; Volume 2006 , 2006 ; 0791837831 (ISBN); 9780791837832 (ISBN) Mozafari, A. A ; Saidi, M. H ; Neyestani, J ; Sany, A. E ; Sharif University of Technology
    Investigation of air distribution and wind effect on a vehicle body from the point of view of underhood heat transfer effect and proper positioning of vehicle elements such cooler, condenser and engine configuration is an important area for engine researchers and manufacturers as well. In this research, the effect of air velocity distribution and wind effect around a vehicle is simulated and temperature and velocity distribution around engine block which is influenced by the wind effect is investigated. Thermal investigation of the engine compartment components is performed using results of underhood air temperature and velocity distribution. The heat transfer from engine surface is... 

    Simulation of cumulative absolute velocity consistent endurance time excitations

    , Article Journal of Earthquake Engineering ; Volume 25, Issue 5 , 2021 , Pages 892-917 ; 13632469 (ISSN) Mashayekhi, M ; Estekanchi, H. E ; Vafai, A ; Mirfarhadi, S. A ; Sharif University of Technology
    Taylor and Francis Ltd  2021
    Endurance time method is a dynamic analysis in which structures are subjected to increasing excitations. These excitations are generated to be compatible with ground motions. Conventional excitation generating processes take into consideration the dynamic characteristics related to intensity and frequency contents of ground motions; however, duration-related characteristics have never been considered directly. In this study, the existing methodology is extended to include Cumulative Absolute Velocity as a duration-related parameter in the generating process. These newly generated excitations are then employed to estimate nonlinear responses of three concrete structures as case studies.... 

    Prevascularized micro-/nano-sized spheroid/bead aggregates for vascular tissue engineering

    , Article Nano-Micro Letters ; Volume 13, Issue 1 , 2021 ; 23116706 (ISSN) Rahimnejad, M ; Nasrollahi Boroujeni, N ; Jahangiri, S ; Rabiee, N ; Rabiee, M ; Makvandi, P ; Akhavan, O ; Varma, R. S ; Sharif University of Technology
    Springer Science and Business Media B.V  2021
    Efficient strategies to promote microvascularization in vascular tissue engineering, a central priority in regenerative medicine, are still scarce; nano- and micro-sized aggregates and spheres or beads harboring primitive microvascular beds are promising methods in vascular tissue engineering. Capillaries are the smallest type and in numerous blood vessels, which are distributed densely in cardiovascular system. To mimic this microvascular network, specific cell components and proangiogenic factors are required. Herein, advanced biofabrication methods in microvascular engineering, including extrusion-based and droplet-based bioprinting, Kenzan, and biogripper approaches, are deliberated with... 

    Experimental and theoretical investigation of heat transfer in vortex combustion engines

    , Article 2005 ASME International Mechanical Engineering Congress and Exposition, IMECE 2005, Orlando, FL, 5 November 2005 through 11 November 2005 ; Volume 376 HTD, Issue 1 , 2005 , Pages 319-326 ; 02725673 (ISSN); 0791842215 (ISBN); 9780791842218 (ISBN) Farvardin, E ; Saidi, M. H ; Ghafourian, A ; Sharif University of Technology
    Heat transfer phenomenon in a recently developed vortex engine has been surveyed. Cooler walls, better combustion performance and more stable relative to the other engines, make these engines very interesting. These advantages have been obtained by using a bidirectional swirl flow, containing a cool outer and a hot inner vortex, traveling upstream and downstream respectively. The most eminent benefit of these combustion chambers, having highly reduced wall temperature, is the result of convective heat release from the wall by the outer vortex. A thorough numerically and experimentally investigation has been performed on radiation and convection heat transfer to realize the exact heat... 

    Towards tool support for situational engineering of agile methodologies

    , Article Proceedings - Asia-Pacific Software Engineering Conference, APSEC, 30 November 2010 through 3 December 2010, Sydney, NSW ; 2010 , Pages 326-335 ; 15301362 (ISSN) ; 9780769542669 (ISBN) Shakeri Hossein Abad, Z ; Hasani Sadi, M ; Ramsin, R ; Sharif University of Technology
    Various agile software development methodologies, practices, and techniques have been proposed in the last decade; some present novel ideas, while many are simply made up of tasks and techniques borrowed from prominent agile methodologies. Each of these methodologies prescribes a set of practices and techniques which are deemed appropriate for application in a specific context. However, there exists no single method which fits all project situations. This has resulted in the advent of Situational Method Engineering (SME) approaches, which are used for developing software methodologies that are tailored to fit the specific circumstances of the project situation at hand. Since tool support has... 

    Design and construction of a two-phase fluid piston engine based on the structure of fluidyne

    , Article Energy ; Volume 127 , 2017 , Pages 660-670 ; 03605442 (ISSN) Moazami Goudarzi, H ; Yarahmadi, M ; Shafii, M. B ; Sharif University of Technology
    Elsevier Ltd  2017
    Engines that extract energy from low-grade heat sources, e.g., from other processes, have received considerable attention recently. The use of Fluidyne, which is a liquid piston Stirling engine, is quite popular. Herein, we explore the use of liquid-to-vapor phase change in a Fluidyne. This provides two considerable differentiators; (1) exploitation of very low temperature difference ΔT≈30 K, and (2) relatively low temperature ΔT≈330 K heat sources, for producing mechanical work, and thus electrical energy. The influence of three operating parameters, i.e., input heat flux, working fluid, and filling ratio, on the performance of the engine was characterized. Their optimum values, which yield... 

    Applying the system engineering approach to devise a master's degree program in space technology in developing countries

    , Article 60th International Astronautical Congress 2009, IAC 2009, Daejeon, 12 October 2009 through 16 October 2009 ; Volume 10 , 2009 , Pages 8365-8376 ; 9781615679089 (ISBN) Jazebizadeh, H ; Tabeshian, M ; Taheran Vernoosfaderani, M ; Sharif University of Technology
    Although more than half a century is passed since space technology was first developed, developing countries are just beginning to enter the arena, focusing mainly on educating professionals. Space technology by itself is an interdisciplinary science, is costly, and developing at a fast pace. Moreover, a fruitful education system needs to remain dynamic if the quality of education is the main concern, making it a complicated system. This paper makes use of the System Engineering Approach and the experiences of developed countries in this area while incorporating the needs of the developing countries to devise a comprehensive program in space engineering at the Master's level. The needs of... 

    Dynamic model identification and control of small turbojet engines using frequency response analysis

    , Article 2012 International Conference onAdvanced Mechatronic Systems, ICAMechS 2012 ; 2012 , Pages 553-558 ; 9780955529382 (ISBN) Banazadeh, A ; Abdollahi Gol, H ; Ramazani, H ; Sharif University of Technology
    System Identification is a key technology for the development and integration of modern engineering systems including gas turbines. These systems are highly parametric with complex dynamics and nonlinearities. Small turbojet engines are special class of gas turbines that are suitable for scientific purposes and researches in the area of stability, performance, simulation and fuel control design. The motivation behind the presented study is to improve the speed, quality and cost of engine testing and to gain insight into alternatives to traditional identification methods for gas turbines. It discusses the identification of small turbojet engine dynamics by validating the thermodynamic model... 

    A novel approach on project performance monitoring and overrun probability measurement using statistical process control techniques

    , Article Proceedings, Annual Conference - Canadian Society for Civil Engineering, 14 June 2011 through 17 June 2011 ; Volume 4 , June , 2011 , Pages 2937-2946 Mobtadi, R ; Mortaheb, M. M ; Sharif University of Technology
    The earned value management (EVM) is a tool commonly used to monitor both cost and schedule performance, based on the current status of a project. However, EVM does not consider the variation rate of project performance during project execution phase, which may oscillate, causing unexpected time and cost overruns or even project failure at the end. In this research, a methodology for monitoring project time and cost adverse variation rate, by the use of statistical process control (SPC), is introduced. This methodology improves the previous investigations in this field by considering overall required conditions and circumstances. Process capability indices of SPC, as a very powerful tool for... 

    Investigation of the effect of reformer gas on PRFs HCCI combustion based on exergy analysis

    , Article International Journal of Hydrogen Energy ; Volume 41, Issue 7 , 2016 , Pages 4278-4295 ; 03603199 (ISSN) Neshat, E ; Saray, R. K ; Hosseini, V ; Sharif University of Technology
    Elsevier Ltd  2016
    Lack of a direct method to control combustion timing is one of the main disadvantages of homogeneous charge compression ignition (HCCI) engines. Fuel blending, in which two fuels with different auto-ignition characteristics are blended, can be used to control combustion timing. Utilizing different additives is another method for HCCI combustion control. The aim of this research is investigation on the effect of reformer gas addition on the availability terms in HCCI engines fueled with primary reference fuels (PRFs). A multi zone model (MZM) coupled with a semi detailed chemical kinetics mechanism is used for calculation of different terms of exergy analysis. Heat and mass transfer between... 

    Investigation of the relationship between engine valve leakage and acoustic emission measured on the cylinder head ignoring combustion effects

    , Article Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering ; Volume 230, Issue 1 , 2016 , Pages 3-9 ; 09544089 (ISSN) Jafari, S. M ; Mehdigholi, H ; Behzad, M ; Sharif University of Technology
    SAGE Publications Ltd 
    Finding leakage in valves is important to troubleshoot performance of internal combustion engines. Leakage can lead to a reduction in engine power and an increase in emissions. The main objective of the present study is to investigate relationship between valve leakage and the acoustic emission generated from the steady flow in the cylinder head of the internal combustion engine. The test rig is the cylinder head for a spark-ignited engine. The test rig simulates the valve leakage due to valve clearance. The valve clearance fault was artificially simulated by a very small lift in valve. The acoustic emission method was used to measure acoustic emission signals generated by valve flow.... 

    Investigating the effect of the heat transfer correlation on the predictability of a multi-zone combustion model of a hydrogen-fuelled spark ignition engine

    , Article Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ; Volume 230, Issue 1 , 2016 , Pages 70-81 ; 09544070 (ISSN) Tabatabaie, T ; Ehteram, M. A ; Hosseini, V ; Sharif University of Technology
    SAGE Publications Ltd 
    Research on the heat transfer in hydrogen-fuelled spark ignition engines indicates that the two most common heat transfer correlations, namely the Annand correlation and the Woschni correlation, cannot perfectly predict the heat flux during the engine cycle. This questions the accuracy of thermodynamic hydrogen engine models because the heat transfer is one of the important submodels in the development of a thermodynamic model. In addition, the Hohenberg correlation and the Shudo-Suzuki correlation have not been evaluated for hydrogen engines. In this study, a thermodynamic model of the closed cycle of a spark ignition engine is developed with a multi-zone combustion submodel to predict the... 

    An experimental study on low temperature combustion in a light duty engine fueled with diesel/CNG and biodiesel/CNG

    , Article Fuel ; Volume 262 , 2020 Ghaffarzadeh, S ; Nassiri Toosi, A ; Hosseini, V ; Sharif University of Technology
    Elsevier Ltd  2020
    Low temperature combustion potentially can improve engine efficiency coupled with the benefits of low nitrogen oxides, and particulate matter emissions, and vice versa high unburned hydrocarbon and carbon oxide emissions through in-cylinder fuel reactions. In this survey, the experiments were carried out using a modified one-cylinder reactivity controlled compression ignition engine, dual-fueled diesel/compressed natural gas and biodiesel/CNG, to investigate the effects of direct injection strategies on the engine combustion efficiency and emission characteristics. Different ratios of biodiesel blends at different premixed ratios were applied to the dual-fuel engine. The results showed that...