Accelerometer data Flashcards
Define posture
the position in which an animal or human holds their body when standing or sitting
Define motion
A change in position
Define acceleration
It is a change in velocity over time
So an object accelerates if it speeds up, slows down or changes the direction it is moving in
What does an accelerometer do?
It measures linear acceleration.
What are many accelerometers based on?
The mass-spring principle.
Explain the following body translation axes:
1) heave
2) Surge
3) Sway
1) Heave = up or down change of position
2) Surge = forward-backward position change
3) Sway = left-right translation
Explain the following body rotation axes:
1) Pitch
2) Roll
3) Yaw
1) Pitch = rotation around the side to side axis (nose up or down)
2) Roll = rotation around the front-back axis
3) Yaw = rotation around the vertical axis
Explain shock in terms of inertial sensing
Detection of a sudden impact
Explain tilt in terms of inertial sensing
Measure of the inclination or angle of change
Explain vibration in terms of inertial sensing
Detect acceleration and deceleration occurring in a specific manner
Explain rotation in terms of inertial sensing
Measure the angular rate–how quickly an object turns.
The rotation is typically measured in degrees per second of change and in reference to one of three axes: yaw, pitch, or roll.
What does OBDA stand for?
Overall Dynamic Body Acceleration?
OBDA =
OBDA = x + Y + z (after subtracting static components)
Define speed
How fast something is moving (speed is always a positive number)
What is a scalar?
A quantity that can be described by a single number
