Recent content by kwas

Nope... that's not the solution... the motion does not approximate a heart beat because of elasticity of the layers between the person and the sensor, and the force can be applied either in phase or out of phase.

too bizarre?

There's a guy sleeping on a mattress. Under the mattress there is an air chamber connected to a pressure sensor whose signal is amplified. When the subject's heart beats the force creates an oscillatory motion due to the air compressibility and mattress elasticity. The next heart beat will...

There I have what? This system is not chaotic, it is a pendulum not a rotator, and I still need to find out the times in which force is applied.

The force is applied for a fraction of a second. The interval is approximately every second. This is for a ballistocardiograph.

When a force is applied to a pendulum, the pendulum sways back and forth until it eventually stops. In this problem however, a force is applied at uneven time intervals while the pendulum is still in motion. The force is always applied in the same direction. A data set is given containing...