Rework filter tuning, add dynamic notch filters #3467
Conversation
julianoes
commented
Nov 20, 2024
julianoes
commented
- Expand the filters with sub-headings.
- Extend one static notch to two.
- Add dynamic notch filters.
- Expand the filters with sub-headings. - Extend one static notch to two. - Add dynamic notch filters.
en/config_mc/filter_tuning.md
Outdated
|
|
||
| #### Dynamic Notch Filters | ||
|
|
||
| Dynamic notch filters use ESC RPM feedback and/or the onboard FFT analysis to track the rotor blade pass frequency and its harmonics. |
There was a problem hiding this comment.
The static notch filter appears to serve the same purpose - filter blade frequency and its first harmonic (vs dynamic multiple harmonics).
- So when would you use one or the other?
- The example in Daniels' original PR filtered crap from props with slight damage - I presume that results in more noise and harmonics?
There was a problem hiding this comment.
I suppose the dynamic one is generally better but only possible when you have ESC feedback. Not sure about the FFT one?
@dagar when would you use the FFT instead of the static notch filter?
There was a problem hiding this comment.
Shall we merge and you chase him for this answer offline? My concern is that he will be too busy to respond, and we end up merging this in 2 years, no better or worse off.
There was a problem hiding this comment.
Let me ping @bresch as well, he might know and answer quicker.
There was a problem hiding this comment.
The FFT is to track a moving vibration peak (e.g.; the blade-pass frequency when ESC telemetry is not available). The static notch is usually to cover a structural mode of the airframe.
I would say that you either use the ESC feedback or the FFT to move the dynamic notches, but you can use a static notch in addition to the dynamic ones.
|
Thanks for the review @hamishwillee! |
Co-authored-by: Mathieu Bresciani <brescianimathieu@gmail.com>
|
No flaws found |
