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Design and Modelling of a Piezoelectric Accelerometer and Fabricating a Single Axis Accelerometer Prototype

Ghorbani, Mohamad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46508 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Vossoughi Vahdat, Gholamreza; Movahhedy, Mohammad Reza
  7. Abstract:
  8. Nowadays, in many of industrial processes, it’s necessary to measure acceleration of a moving object. Among the different type of accelerometers, the piezoelectric type are most useful and the most widely used. These sensors come in various configurations.
    In the past, analytical and semi-empirical models have been used to design piezoelectric accelerometers. In these methods, based on some assumptions, the accelerometer nonlinear model is replaced with a linear model and the equivalent circuit model has been used to model accelerometer behavior. In these methods, the behavior of accelerometer become different from the expected one.
    Recently, with the invention of efficient computing devices, one of the most useful numerical methods is the finite element method. In general, the simulated results of this method are more accurate than other methods. Furthermore, using this method, we can predict many useful characteristics of an accelerometer.
    The output of the piezoelectric material in piezoelectric sensors is charge with high impedance. Because of the problems in transmitting this signal, an electronic preamplifier circuit usually is placed in the accelerometer to decrease its output impedance. These sensors are named Integrated Circuit Piezoelectric Transducers.
    The goal of this thesis is to design a piezoelectric accelerometer using finite element modeling. Using this method, behavior of the accelerometer is investigated. Finally, a prototype of this sensor will be fabricated. A preamplifier circuit will be used inside of the sensor to decrease its output impedance. Furthermore, after modeling the accelerometer using finite element method, its voltage sensitivity, resonance frequency, lateral sensivity and base strain sensivity will be obtained using FEM analysis. At last, the results from both the numerical and experiments on the prototype unit will be compared
  9. Keywords:
  10. Piezoelectric ; Preamplifier ; Modeling ; Finite Element Modeling ; Accelerometer

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