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Energy Harvesting from Cantilever Beam Vibrations in Chaotic State

Golzari, Ali | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50540 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi
  7. Abstract:
  8. The need to supply energy of low voltage electronic circuits such as sensors and wireless systems has attracted many researchers in recent years. As a solution to this problem, the energy needed for electronic devices can be obtained from the surrounding environment. An important part of energy harvesters are the systems that use vibrating energy of mechanical devices known as vibration power generators. Most linear vibration generators are systems that operate in resonance mode. As the frequency of the environment moves away from the natural frequency of the generator, the amount of converted energy decreases significantly. For this reason, some solutions are needed to solve this problem. In this study, a model is presented that uses a piezoelectric cantilever beam and is in line with gravity acceleration. There was a concentrated mass at the end of this beam. Typically, a beam has one stable equilibrium position in its center. By adjusting the amount of mass at the end of the beam, the beam was bifurcated and its balance points increased to three points of equilibrium and in this situation, the central equilibrium point became unstable. By choosing the appropriate concentrated mass, according to the frequency range of the environment and based on the Melnikov theory, the vibrations of the beam can be chaotic and the amount of energy harvested from it can be compared to other vibrational states. After examining this model, it can be concluded that although the amount of electrical energy received from a chaotic system is greater than a linear or nonlinear monostable beam, the amount of energy harvested is lower than that of snap through vibrations. At the end, it was attempted to make the harvested energy more desirable by finding the appropriate parameters
  9. Keywords:
  10. Perturbation Method ; Energy Harvesting ; Energy Storage ; Cantilever Piezoelectric Beam ; Melnikov Theory ; Chaotic Vibrations

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