In Kinematics class we were learning about cam design, and about how you want to
minimize the 'jerk' and 'ping' of the follower on the cam. I understand jerk.
That is what I feel when I'm in a car which suddenly accelerates. I feel
I don't know what ping is, other than the derivative of the jerk. How would I
Also, does the derivative of ping have a name?
"N:dlzc D:aol T:com \(dlzc\)" wrote in
I'll go a little further than David.
When you model a mechanical system you pretty much lose interest at
acceleration, for passive systems.However, if you try and model feed-
forward, or feedback systems, you usually include both integrals and
differentials of the signal of interest.
The human proprioception demands such a feed forward device - you want
to hold your head in the same place, so you want to exert a force so
your feed forward system cares about jerk.
If a second order feedforward controller was justified, you'd worry
about d jerk/dt, but in practice that does not seem necessary.