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Simulation of the MEMS Vibratory Gyroscope Through Simulink
Keywords: MEMS vibratory gyroscope, Harsh Environments, Simulink
A MEMS (Microelectromechanical systems) gyroscope is a sensor that measures the rate of change in the angular position of an object. MEMS vibratory gyroscopes are increasingly used in applications ranging from consumer electronics to aerospace and are now one of the most common MEMS products after accelerometers. One such application is in inertial navigation units (INU). With advances in fabrication technologies, the low-cost MEMS gyroscope has opened up a wide variety of applications with environmental conditions ranging from medium to harsh. Despite their widespread use, the performance of MEMS gyroscopes in harsh environments is still under question. Due to the high demand for MEMS gyroscopes in consumer electronics, a majority of available commercial-off-the-shelf (COTS) gyroscopes have limited operating temperature ranges from -40˚C to +85˚C. But, in many applications, such as geological down-hole tool navigation and high-temperature industrial applications, the MEMS gyroscope sensor experiences temperatures that are beyond the manufacturer's recommended temperature range. For example, in some mission-critical high-temperature applications, such as tracking of the movement of a fire-fighter in a smoke filled indoor environment where GPS tracking is unreliable or not possible. Here, error caused by elevated temperature will significantly affect the performance of the MEMS gyroscope and compromise its reliability, endangering the life of the first responder. In such cases, it is important to quantify gyroscope behavior at elevated temperatures. This paper shows a fast and efficient way to simulate the gyroscope behavior at various temperature conditions. With a given value of mass, spring stiffness and damping coefficient, the characteristic equations of motion of the MEMS vibratory gyroscope can be easily solved by Simulink model.
Chandradip Patel, Graduate Student
University of Maryland
Hyattsville, MD

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