List of Articles مدلسازی دینامیکی

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  1 - Study on Status of Higher Education System in Our Country Using Dynamics Systems Modeling
  M.A. Afshar Kazemi H. Asgarian
  One of the important and determining sectors of each society is its higher education system. The highereducation of each country is the factor which creates expert workforce and resolves the various problems ofthe country in a scientific way. In our society these factor More

  One of the important and determining sectors of each society is its higher education system. The highereducation of each country is the factor which creates expert workforce and resolves the various problems ofthe country in a scientific way. In our society these factors and other various factors cause the everincreasingdemand for continuation of higher education at the university and entry to this system and create agap between the number of applicants and the existing facilities, encourage creation of new capacities(mostly with planning) because there is a delay between the beginning of capacity-creation and its fruition.At time of delivery of newly-created capacities, again there is not a harmony between the demand andcapacity. Sometimes this causes the existing capacities not to be filled and completed.In this research we have tried to model the structure of capacity-creation for applicants of entering theIranian higher-education system and execute it in the framework of systemic thought and dynamic systemtools in VENSIM software.Accordingly at first the main variables defining this system to a considerable extent are identified andrealized and their relations are codified according to casual loop diagrams. Then its technical structure iscompleted through design of the main model according to Flow & Stock diagram and assimilated in thesoftware. Through execution of model and analysis of its results the status of the higher education system infuture, derived from today's policies and planning, will be specified. At last more important, more effectiveand more principal indexes will be identified. Some variables can be added to this model. Furthermore anystrategy and solution can be tested and assessed without witnessing the probably negative consequences inreal world. Manuscript profile
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  2 - Dynamic Modeling and Simulation of Cross Flux Permanent Magnet Generator and its Application in Wind Turbines
  Mahmoud Zadehbagheri Vahdat Nazerian
  10.30486/teeges.2022.1966753.1035
  Machines with permanent magnet excitation have higher efficiency and more reliability than machines with electric excitation. Among the permanent magnet machines, the crossover machines have a higher ratio of power to volume and electric torque to volume, so that at the More

  Machines with permanent magnet excitation have higher efficiency and more reliability than machines with electric excitation. Among the permanent magnet machines, the crossover machines have a higher ratio of power to volume and electric torque to volume, so that at the same power, their size is smaller than the usual permanent magnet machines. And this is the reason why researchers have paid attention to crossover machines in recent years. Cross-phase generators can be made with a smaller pole pitch than other machines. These features make these machines have a higher power density than other permanent magnet machines. The copper winding of the crossover generators is simple, and their passive copper winding is considerably less than other machines, so the mass of active materials required to produce power and electric torque can be less than other machines. In other words, a smaller volume of active materials per unit of electric torque can be obtained by these machines. Therefore, this generator creates high power and torque by creating a large number of poles and a small pole pitch, and it can be a suitable option for use in the production of electrical energy from wind power, especially at low wind speeds.  The lack of a suitable dynamic model and the application of this generator, dynamic modeling and simulation, are necessary to analyze its performance under different conditions. Therefore, this article presents a dynamic model for this generator to be connected to the wind turbine, and then simulates the wind turbine based on this generator by simulating the turbine-generator system. Manuscript profile
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  3 - بررسی میزان کاهش مصرف سوخت در خودروی هایبرید موازی نرم به کمک مدلسازی ریاضی
  مجید قدسی علیرضا خجسته پور جواد درویشی
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