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Design and Implementing of a Mechanical Filter to Reduce the Effect of Vibrations on Gyroscopes based on a Microelectromechanical System

Zali, Abbas | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57633 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Salarieh, Hassan; Mer’aat, Kaveh
  7. Abstract:
  8. Microelectromechanical sensors are small and sensitive devices that can measure physical quantities such as pressure, temperature, speed, and acceleration. Some of these sensors, which include accelerometers and gyroscopes, are used in small navigation systems. These sensors are highly sensitive and influenced by their surrounding environment, which may malfunction under the influence of some environmental factors; In such a way that the data output from them is accompanied by a significant error. One of the factors causing malfunction of the sensor is the high frequency fluctuations of the environment. In practice, it is not possible to completely eliminate these fluctuations. A logical and practical solution is to use a vibration management plugin called an isolator or filter. Vibration isolators are a low-pass mechanical filter that protects sensitive parts from unwanted vibrations. In this research, passive vibration isolators with a flexible structure are used to improve the performance and protect the microelectromechanical sensor. The design process of the isolator is as follows: starting from a preliminary design based on presenting the expected vibration behavior of the isolator with the help of finite element simulation and trial and error method, the design and implementation process of the vibration isolator began and by presenting a method Principles in the design of vibration isolators are concluded in a parametric way. After obtaining the desired results and behavior of the vibration isolator in all three directions, the final design will enter the production and manufacturing stage using resin 3D printing technology. Finally, the manufactured isolator is placed in an electronic board package carrying a micro-electromechanical sensor and after preparing a suitable experimental setup, it is subjected to experimental and operational testing with the help of a vibrating shaking device, and its performance is checked in the environment and conditions close to reality. It can be The investigations carried out in the current research show that the process of simulating the vibration isolator system gives an acceptable performance of the vibration-absorbing, and better results can be obtained by fixing the defects and flaws in the construction of the system components and also by improving the quality of the experimental test method
  9. Keywords:
  10. Microelectromechanical Systems (MEMS) ; Vibration Isolators ; Three Dimentional Printing ; Vibratory Gyroscope ; Vibration Behaviour ; Microelectromechanical (MEMS)Accelerometers

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