Accelerometers and Rate Gyros

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| ME 339L | Lab 4: Measurement of the Motion of a Remote Controlled Car with Accelerometers and Rate Gyros | | By Joseph Carr Group Members (Joseph Carr, Vasile Tudoran) | 4/16/2012 | Introduction In the world today accelerometers are used in many different applications of engineering. Some of their applications are to measure vibration on cars, machines, buildings, process control systems and safety installations. They can also be used to measure seismic activity, inclination, machine vibration, dynamic distance and speed with or without the influence of gravity. Not only are accelerometers used for engineering purposes, but they are commonly used in other fields, such as, medical, navigation, biology and transport. Rate gyros are a type of gyroscope, which rather than indicating direction, indicates the rate of change of angle with time. They are used in rate integrating gyroscopes along with altitude control systems for vehicles, and in combination with other sensors to make inertial navigation systems. In this experiment two accelerometers with a rate gyro are used to show how rigid body motion measurements can be taken and then compare these results with video from a high speed camera. These devices will be attached to a remote control car which will drive through a course to acquire useful data such as position, heading, and velocity. Theory An accelerometer is electro-mechanical device in which its output voltage varies proportionally to linear acceleration and is essentially a small mass connected to a spring and damper. The type of acceleration the accelerometer measures is called apparent acceleration. For this type of acceleration the device will measure a value of 1G or 9.81m/s2 when held in the +90˚ angle and in a gravitational free fall it will measure a value of 0G because, even though it’s speed is

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