Iran University of Science & Technology Automotive Science and Engineering 2717-2023 2717-2023 1 2 2011 6 1 Simulation of the Dynamic Behavior of the Magneto-rheological Engine Mount for Automotive Applications 1 5 EN T. Feyzi department of mechanical engineering feizi.mech@gmail.com Y M. Esfahanian department of mechanical engineering mohsen.esfahanian@gmail.com N R. Tikani department of mechanical engineering r_tikani@me.iut.ac.ir N S. Ziaei Rad department of mechanical engineering szrad@cc.iut.ac.ir N http://ase.iust.ac.ir/article-1-18-en.html http://ase.iust.ac.ir/article-1-18-en.pdf

Iran University of Science & Technology Automotive Science and Engineering 2717-2023 2717-2023 1 2 2011 6 1 A Study on Performance of Simplified Vehicle Models in Optimization of Hydraulic Engine Mounts in Comparison with Full-Vehicle Model 10 15 EN A. Ohadi Amirkabir University of Technology a_r_ohadi@aut.ac.ir Y Y. Rasekhipour Amirkabir University of Technology N http://ase.iust.ac.ir/article-1-13-en.html http://ase.iust.ac.ir/article-1-13-en.pdf

Iran University of Science & Technology Automotive Science and Engineering 2717-2023 2717-2023 1 2 2011 6 1 Design of an anti-lock regenerative braking system for a series hybrid electric vehicle 16 20 FA M. Tehrani Mechanical engineering department, University of Tehran, Tehran, Iran masih@ut.ac.ir Y R. Hairi-Yazdi Mechanical engineering department, University of Tehran, Tehran, Iran myazdi@ut.ac.ir N Ba. Haghpanah-Jahromi Mechanical and industrial engineering department, Northeastern University, Boston, Massachusetts, USA babak_haghpanah@yahoo.com N V. Esfahanian Mechanical engineering department, University of Tehran, Tehran, Iran evahid@ut.ac.ir N M. Amiri Mechanical engineering department, University of Tehran, Tehran, Iran emeisam@gmail.com N R. Jafari Mechanical engineering department, University of Tehran, Tehran, Iran sahellme@gmail.com N In this paper, an adaptive rule based controller for an anti-lock regenerative braking system (ARBS) of a series hybrid electric bus (SHEB) has been proposed. The proposed controller integrates the regenerative braking and wheel anti-lock functions by controlling the electric motor of the hybrid vehicle, without using any conventional mechanical anti-lock braking system. The performance of the proposed system is evaluated by a comprehensive vehicle dynamics model in MATLAB/Simulink. Using the designed ARBS, the braking and regenerative performances of SHEB have significantly improved in slippery roads while the slip ratios are kept between 0.15 and 0.20. Anti-Lock Regenerative Braking System, Series Hybrid Electric Vehicle, Slip Control, Adaptive Rule Based Controller http://ase.iust.ac.ir/article-1-12-en.html http://ase.iust.ac.ir/article-1-12-en.pdf

Iran University of Science & Technology Automotive Science and Engineering 2717-2023 2717-2023 1 2 2011 6 1 Performance and Emission Characteristics of Dual Fuel Engines at Part Loads Using Simultaneous Effect of Exhaust Gas Recirculation and Pre-Heating of In-let Air 21 25 FA A. Paykani a.paykani86@ms.tabrizu.ac.ir Y R. Khoshbakhti Saray r.khoshbakhti@gmail.com N M. Mohammadi Kousha m.kousha@tabrizu.ac.ir N T. Shervani Tabar sherv@tabrizu.ac.ir N In this study, a numerical simulation using the CFD software, FLUENT, has been conducted to examine the effect of various shapes of the venturi component sections in order to find the optimum venturi specifications to increase the EGR rate with minimum pressure loss at the part load operation range. The CFD results reveal that the venturi should be precisely optimized to introduce the required amount of EGR to the engine manifold. Then, the optimum venturi was manufactured, and it was installed on the engine intake system. By using the optimum Venturi EGR system instead of original system the 26% increase in EGR flow rate to the engine manifold is observed. In the second part of the paper, an experimental investigation was carried out on a “Lister 8-1” dual fuel (diesel – natural gas) engine to examine the simultaneous effect of inlet air pre-heating and EGR on performance and emission characteristics of a dual fuel engine. The use of EGR at high levels seems to be unable to improve the engine performance at part loads, however, it is shown that EGR combined with pre-heating of inlet air can slightly increase thermal efficiency, resulting in reduced levels of both UHC and NOx emissions. CO and HC emissions were reduced by 24% and 31%, respectively. The NOx emissions were decreased by 21% because of the lower combustion temperature due to the much inert gas brought by EGR and decreased oxygen concentration in the cylinder. Dual Fuel Engine, Exhaust Gas Recirculation (EGR), Emissions, Performance, Venturi EGR System http://ase.iust.ac.ir/article-1-15-en.html http://ase.iust.ac.ir/article-1-15-en.pdf

Iran University of Science & Technology Automotive Science and Engineering 2717-2023 2717-2023 1 2 2011 6 1 EFFECTS OF INLET PORT DESIGN FACTORS ON COMBUSTION CHARACTERISTICS AND EMISSION LEVELS OF DIESEL ENGINES 31 35 FA H. Shojaeefard Iran University of Science and Technology, Department of Mechanical Engineering mhshf@iust.ac.ir N Sohrabiasl Iran University of Science and Technology, Department of Mechanical Engineering sohrabiasl@gmail.com N Sarshari K. N. Toosi University of Technology, Department of Mechanical Engineering ehsan_sarshari@sina.kntu.ac.ir Y Intake system design as well as inlet ports and valves configuration is of paramount importance in the optimal performance of internal combustion engines. In the present study, the effect of inlet ports design is investigated on OM-457LA diesel engine by using a CFD analysis and the AVL-Fire code as well. A thermodynamic model of the whole engine equipped with a turbocharger and an intercooler is used to obtain the initial and boundary conditions of the inlet and outlet ports of the engine cylinder which are necessary for performing the three dimensional CFD analysis. The intake stroke as well as the compression and power strokes are included in this three dimensional CFD model. As a mean of validation the performance of the engine model with the base configuration of the inlet ports is compared to the experimental data. Two new alternative configurations for the inlet ports are then investigated with respect to the turbulence levels of the in-cylinder flow and the combustion characteristics as well. Finally it is demonstrated that applying the new configurations results in circa 75% reduction in nitric oxide formation besides increase of 32% in the in-cylinder flow swirl. Inlet ports configuration, geometry optimization, turbulence level, engine CFD model http://ase.iust.ac.ir/article-1-20-en.html http://ase.iust.ac.ir/article-1-20-en.pdf

Iran University of Science & Technology Automotive Science and Engineering 2717-2023 2717-2023 1 2 2011 6 1 Effect of Hydrogen Addition to Natural Gas on Homogeneous Charge Compression Ignition Combustion Engines Performance and Emissions Using a Thermodynamic Simulation 105 114 EN H. Askari Y M. Hoseinalipour N A. Jazayeri N Baghsheikhi N The HCCI combustion process is initiated due to auto-ignition of fuel/air mixture which is dominated by chemical kinetics and therefore fuel composition has a significant effect on engine operation and a detailed reaction mechanism is essential to analysis HCCI combustion. A single zone-model permits to have a detailed chemical kinetics modeling for practical fuels. In this study a single-zone thermodynamic model with detail chemical mechanism is developed to investigate the effect of hydrogen addition to natural gas in a homogeneous charge compression ignition combustion and to analyze the performance and emissions of the HCCI engine. The effect of five different percentage of hydrogen added to natural gas ranging from 0 to 40 on HCCI combustion is investigated in this study. The results indicate that by increasing hydrogen portion in intake mixture, start of combustion advances and maximum temperature increase, but increasing in maximum pressure is negligible. Carbon’s included emissions such as Co, Co2 and unburned hydrocarbons decreases by increasing of hydrogen, and also, specific fuel consumption decreases. The result shows that hydrogen improves combustion characteristics of natural gas in an HCCI engine and leads to better performance and less emissions. HCCI Combustion, Hydrogen, Natural Gas, Thermodynamic Simulation, http://ase.iust.ac.ir/article-1-149-en.html http://ase.iust.ac.ir/article-1-149-en.pdf

Iran University of Science & Technology Automotive Science and Engineering 2717-2023 2717-2023 1 2 2011 6 1 Determination of Optimal ValveTiming for Internal Combustion Engines Using Parameter Estimation Method 130 140 EN Kakaee Y Pishgooie N http://ase.iust.ac.ir/article-1-98-en.html http://ase.iust.ac.ir/article-1-98-en.pdf