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Modeling and Optimization of Energy Harvesting System by Means of Magnetic Shape Memory Alloy

Rostami Najafabadi, Hossein | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48733 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Sayyadi, Hassan
  7. Abstract:
  8. Among different mechanisems for ambient energy harvesters, energy harvesting systems by means of magnetic shape memory alloys are noted due to their long life time, large strain amplitudes and the ability to operate at low frequencies. Strain change in these systems, changes the MSMA magnetization resulting change in the magnetic flux leading to inducing voltage by means of pickup coil. in the commercial systems, magnetic flux path is created by inserting an MSMA specimen in the air gap of ferromagnetic core and generation of bias magnetic field by means of the permanent magnet or electromagnet. In this proposed research, a thermodynamic based constitutive model is selected for the mdeling of the magnetic shape memory alloy under different conditions of strain, and then the model is coupled with the magnetic and electric circuit of energy harvesting system. Validation of the proposed model has shown a good convergance with the reference experimental data. Furtheremore, the proposed model can predict system behavior when parameters change. Simulations of proposed model by changing parameters such as MSMA dimensions, bias magnetic field, dimensions and material of ferromagnetic core, electrical elements etc. shows their influence on the harvested energy thus the obtained results can be used in optimization for different situations
  9. Keywords:
  10. Magnetic Shape Memory Alloys (MSMA) ; Energy Harvesting ; Magnetic Circuit ; Electronic Circuits ; Demagnetization Factor

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