Timeline for How to sensor Jerk=$d^3{\bf r}/dt^3$, or higher derivatives (4th, 5th, 6th order) when applied in the equation of motion of a ballistic missile?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Jan 28, 2016 at 11:19 | vote | accept | Randy Welt | ||
| Jan 22, 2016 at 17:53 | comment | added | Mike Dunlavey | @DukeofSam: It's difficult to take derivatives of physical signals because the noise is amplified. The reason accelerometers are so useful is that you can integrate them, once to get velocity, and twice to get position. They do need to be calibrated to offset constant error, and they do drift, as gyroscopes do, so they occasionally need correction. But there's no good way to take numerical derivatives without heavy smoothing. | |
| Jan 22, 2016 at 17:40 | comment | added | Duke of Sam | The 6th order ode is just what you'd expect from a Taylor expansion for position wrt time. i.e. x0 + vt + at^2/2 + ... | |
| Jan 22, 2016 at 17:38 | comment | added | Duke of Sam | What's wrong with using a bog standard accelerometer and measuring its 1st to 4th derivatives? | |
| Jan 22, 2016 at 13:51 | answer | added | Mike Dunlavey | timeline score: 2 | |
| Jan 21, 2016 at 23:10 | comment | added | Mikael Kuisma | Just out of curiosity, could you link to this 6th order differential equation? | |
| Jan 21, 2016 at 18:55 | history | edited | Qmechanic♦ | CC BY-SA 3.0 |
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| Jan 21, 2016 at 18:38 | history | asked | Randy Welt | CC BY-SA 3.0 |