I'm trying to estimate the person's weight from some available sensors and I have an accelerometer, a gyrometer and a magnetometer.
The triaxial accelerometer is fixed in a band in the person's chest, so it can measure the body acceleration. While the person is still in its tiptoes, as the figure below, he's asked to let the body weight fall without resisting.
I think this way I can put the knee flexion aside.
I think the movement can be modulated as a mass-spring-damper system so I'll have to calculate the damping coefficient(
d), and the spring constant(
The accelerometer gives me three accelerations (
ax ay az). I remove then the gravity influence from then with an high-pass and compute its projection in the vertical axis.
That is the vertical acceleration.
The image below represents the vertical acceleration while the person's lets the body fall for 4 times.
What if I know the height of the person?
Could it help estimating the mass in the moment of the impact?
Assuming this as a mass-spring-damper system,
well, now I have to calculate both c (spring constant) and k (viscous damper),
I've calculated this equations,
e is my coeficient of restitution and
fn is my natural frequency.