Modeling and Optimization of a Voltage-Induction Electrostatic Motor (original) (raw)
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مهندسی مکانیک و ارتعاشات, 2014
The purpose of this research was to develop a thermodynamic model for engine via changing the form of regenerator. In conventional betatype Stirling the working fluid passes between the compression and expansion space via the bypass of the main cylinder. In the present study a new form of regenerator was proposed for the beta-type Stirling engine. In this new form successive homogeneous layers of sguare wire meshes filled the space of displacer piston so that the displacer piston took the role of regenerator and displacer simultaneously. To this end modeling was done using MATLAB software and the obtained results were compared with the published values.
Design and Manufacturing Magnetic Damper and Active Control of Beam Vibrations using Eddy current
There is different methods to damp the vibration. However, the numbers of contactless methods are limited. Eddy current dampers are of these procedures. Eddy current is produced in a nonmagnetic conductive material when it is subjected to a time varying magnetic field. In this research, active and semi-active types of eddy current dampers are manufactured and input impulse responses for different damping modes are determined experimentally and numerically. The Aluminium cantilevered beam is stimulated by an eddy current impact. The stiffness and damping coefficient are derived by a reduced logarithmic method according to the time response. The response to impulse is simulated by Simulink of MATLAB and the outcomes are compared with experimental results. Both results show significant decrease in the peak of frequency responses. The results of modal semi-active experiments show the effective suppress of vibration by more than 10 dB. Experiments on the active damper demonstrate a remarkable decrease in the first and second peak of frequency spectrum and increase in bandwidth over previously used eddy current methods.
Analysis and Optimization of Reducing Steady State Time for Heating Systems
Majlesi Journal of …, 2011
يور ﺮﺑ ﻖﻴﻘﺤﺗ ﻪﺠﻴﺘﻧ ﺮﺿﺎﺣ ﻪﻟﺎﻘﻣ يﺎﻳﺎﭘ ﺖﻟﺎﺣ ﻪﺑ نﺪﻴﺳر نﺎﻣز ﺶﻫﺎﻛ ﻢﺘﺴﻴﺳ ﻫ ﻲﺗراﺮﺣ يﺎ ﺖﺳا . ﺗﺮﺗ ﻦﻳا ﻪﺑ ﺎـﺑ يزﺮـﻣ ﻂﻳاﺮـﺷ ﻪـﻛ ﺐﻴ ﻲﻣ راﺮﻗ لﺮﺘﻨﻛ ﺖﺤﺗ ﻢﺋاد ﺖﻟﺎﺣ ﻪﺑ لﻮﺻو ﺎﺗ ﻪﻧﺎﻣﺎﺳ ﻲﻜﻳﺰﻴﻓ تﺎﺼﺨﺸﻣ ﻪﺑ ﻪﺟﻮﺗ دﺮﻴﮔ . ﺶﻫوﮋﭘ ﻦﻳا رد ﻲﻫﺎﮕﺸـﻳﺎﻣزآ ﻲـﺗراﺮﺣ ﻪﻧﺎﻣﺎﺳ ﻚﻳ ... هﺪﺷ ﻲﺳرﺮﺑ يدﺪﻋ يزﺎﺳ ﻪﻴﺒﺷ زا هدﺎﻔﺘﺳا ﺎﺑ ﺞﻳﺎﺘﻧ ﺎﺑ يدﺪﻋ ﻞﺣ ﺞﻳﺎﺘﻧ و ﻪﺴﻳﺎﻘﻣ ﻲﺑﺮﺠﺗ ﺶﻳﺎﻣزآ ﺪﻨﭼ ياﺮﺟا مﺎﺠﻧا ﺖﺳا هﺪﺷ ...
2016
Dynamic economic emission dispatch (DEED) is a multi-objective optimization problem by which the generators power output are scheduled over the whole dispatch period in order to minimize the fuel cost and emission. This multi-objective optimization problem should meet the load demand constraint and some non-linear constraints such as the valve-point loading effect, prohibited operating zones, and spinning reserve requirements. In this paper an integrated model of the DEED problem and the emergency demand response program (EDRP) has been presented. In the integrated model, the fuel cost and emission are minimized and the optimal incentive is determined simultaneously. In EDRP which is one of the incentive-based demand response programs, incentives are paid to the customers to motivate them reduce their consumption during peak hours or shift it to off-peak hours. The proposed model (DEED-EDRP) is a non-linear complicated optimization problem which may not be solved by the conventional methods. So, four different population-based meta-heuristic algorithms have been used to solve the combined problem. The proposed model has been applied on a ten units test system. Results show that the proposed model is so effective in reducing the total cost and emission and improving the load curve characteristics.
Identification of Underwater Vehicle Hydrodynamic Coefficients Using Model Tests
Volume 8: Dynamic Systems and Control, Parts A and B, 2010
Predicting the hydrodynamic coefficients of an autonomous underwater vehicle (AUV) is important during vehicle design. SUT-2 is an AUV, being developed by the Marine Engineering Research Center of Sharif University of Technology in Iran (MERC). Model tests are done in the marine engineering laboratory towing tank. In this research, hydrodynamic coefficients are calculated using model test results of an autonomous underwater vehicle. Hydrodynamic forces are also analyzed. These coefficients are used for dynamic modeling and autonomous controller design.
2015 7th International IEEE/EMBS Conference on Neural Engineering (NER), 2015
During the last decade, functional neuromuscular stimulation (FNS) has been proposed as a potential technique for restoring motor function in paralyzed limbs. A major challenge to restoring a desired functional limb movement through the use of intramuscular stimulation is the development of a robust control strategy for determining the stimulation patterns. A major impediment to stimulating the paralyzed limbs and determining the stimulation pattern has been the highly non-linear, time-varying properties of electrically stimulated muscle, muscle fatigue, large latency and time constant which limit the utility of pre-specified stimulation pattern and open-loop FES control system. In this paper we present a robust strategy for multi-joint control through intramuscular stimulation in which the system parameters are adapted online and the controller requires no offline training phase. The method is based on the combination of sliding mode control with fuzzy logic and neural control. Extensive experiments on three rats are provided to demonstrate the robustness, stability, and tracking accuracy of the proposed method. The results show that the proposed strategy can provide accurate tracking control with fast convergence.
ریختهگری دوغابی مخلوط پودرهای آلومینا-آهن تحت میدان مغناطیسی
مواد و فناوری های پیشرفته, 2017
In this study, alumina-iron composites have been prepared by slip casting in order to provide gradient iron in alumina. 5 wt.% of iron was used under the magnetic fields by the magnitude of 0.8 and 0.08T. Two dispersants were examined as the dispersing agent using 70, 75 and 80 wt.% of solid loading in slips. Samples were sintered in a microwave oven at the temperature of 1350˚C and 1450˚C for 30 minutes, at 1500˚C for 1 minute, and in a conventional tube oven at the temperature of 1485˚C for 2 hours using argon gas. The apparent and optical microscope pictures of green and sintered samples revealed that using PCN and 70 wt.% of solid loading under the mild magnetic field results in the best sample regard as density (3.7 g/cm 3), strength (82.7 MPa) and iron gradient.