2 ms·
https://en.wikipedia.org/wiki/Low-pass_filter https://en.wikipedia.org/wiki/Low-pass_filter
by mam2 6y ago
https://en.wikipedia.org/wiki/Low-pass_filter https://en.wikipedia.org/wiki/Low-pass_filter
- DoingIsLearning 6y agoThe helmet and head are too loosely mechanically coupled. Let's say you have acccelerometer data from a sensor on the helmet and you pass it through an LPF: If you have the helmet bobbying at really high forces you over-represent real G forces and you are right that you could negate that with filtering. _However_, if you have really high forces transmitted from the bobsleigh up to the torso/neck/head it is possible that the inertia of the loosely coupled helmet makes it not register the full force as propagated through the tightely coupled torso/neck/head and you underrepresent the real G forces experienced by the brain/skull. Accelerometer sensors should be coupled with the skull for proper risk/hazard assessment.
- dvt 6y agoPlease take this dismissive Wiki-linking clap-back garbage back to reddit. I come to HN to read insightful, diverse, thought-provoking discussion. It's definitely been slipping, but it's one of the few places on the internet that at least still tries.
- ehnto 6y agoYou could filter it and make it look like what you think it should look like, but it would still be a measurement of the forces applied to the helmet not the head.