Here begins a long list of I’m confused questions. Setting up a brand new frame X, 15-inch props, slightly offset in height slightly tilted forward. Am I right in thinking 142Hz is the problem child here? I am not really sure what I am looking at.
Notice that normally the second peak is at twice or trice or four times the frequency of the first. Those are called harmonics. You set the filter for the lowest frequency and explain the filter that (in your case) you want to suppress the third multiple frequency as well.
The harmonic notch filter (as the name suggests) will then suppress the main (lower frequency peak) as well as the other peak.
Take a look at the excellent documentation, it`s worth a read.
Actually, I had multiple peaks. from my understanding, the increasing harmonics should have less amplitude. But in my case, the harmonics of 192 hz were suppressed correctly within the bandwidth of the filter. However, a peak higher than the harmonic’s amplitude occurred at 60 hz.
here is my data, if you’re willing to take a look:
Hi. I think my drone got a little light ( Quad , Total flight weight is 7140 grams, T-motor MN6007II ) so when forward flight ( Mapping mission ) C1 and C3 motors spins a little slower and I get a vibration alert on Z axis . ( I am using foldable props ) . Can i solve this problem using notch filter ?
If I can’t solve this problem with filter , I will either use a non-foldable propeller or use more weight for high rpm .
Hi can someone explain me. I did set the throttle based notch few months ago and now If my octocopter is flying with different loads and:
“MOT_THST_HOVER” is changing depends on the weight of the flying copter. Should I change
“INS_HNTCH_REF” to match this new value ?
So If the: “MOT_THST_HOVER” is now is 0.29 and “INS_HNTCH_REF” is 0.27 should I change the “INS_HNTCH_REF” to 0.29 ?
Maybe, but by changing the weight you will have also changed the tune and the rpm at hover so really you should do the whole setup again - this is the problem with the throttle based notch. Same applies winter vs summer - different air density gives different results.