- #1

Navid T

- 5

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I have a projectile project. we throw an object with variable speed but about 80 mps and about 90 degrees from Earth level. our goal is to find maximum height that is usually between 250 to 350 meters by means of 3 axis accelerometer and 3axis gyro ( MEMS technology ). In fact we use start of free falling of object to detect maximum height of throw. when object rotation is very low our detection is good, we find place that 3 axis of accelerometer give zero g to detect free fall and start of free fall is our maximum height. our problem is when object has more rotation speed, z axis of accelerometer gives another values instead of zero g because of centrifugal force of rotation. we tried to correct these values by means of gyro angular speed but that was not so good too. now I'm looking for some formulaor relation between accelerometer and gyro values to find maximum height or free fall of rotating object without using throwing initial speed.

In simple form I'm looking for some way or formula to find maximum height of throwing object that rotates around random axis with angular speed more than 100 rpm, and i have just 3 axis accelerometer and 3 axis gyroscope data not initial velocity.

I have some graph of sensor outputs if it can help

Regards