Beyond velocity and acceleration: jerk, snap and higher derivatives (2016)

Re:Beyond velocity and acceleration: jerk, snap and higher d... by soVeryTired on Wednesday June 19, 2024 @08:58AM (#40727865)

I used to work at a self-driving car company, and all the vehicle's motion was planned around how much jerk to apply.

Your muscles are pretty good at applying a constant force (or responding to a constant acceleration). Hold your arm out straight: it's no effort to keep your arm still and counteract the force of gravity. Now imagine gravity varies quickly and randomly between 0.5g and 2g. I guarantee your arm won't stay still.

The same prinicple applies on a bus or in a car, except this time the forces are smaller, and it's your neck keeping your head still!

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Re:Beyond velocity and acceleration: jerk, snap and higher d... by amelius on Wednesday June 19, 2024 @11:18AM (#40729104)

Ok, minimizing jerk makes sense, but how about snap and crackle? Because GP said:

> (...) jerk, snap and crackle. Turns out if you minimize those, you get a far more comfortable ride.

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Re:Beyond velocity and acceleration: jerk, snap and higher d... by soVeryTired on Wednesday June 19, 2024 @11:40AM (#40729296)

Snap and crackle I couldn't tell you about. But jerk is definitely important.

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