vault backup: 2025-02-05 14:38:06
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# State of the Art
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1. RCBench macht probleme. --> konstant verbindungsprobleme und stürzt ab. Zu viel vibration hinter scich? Crack irgendwo?
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2. Konnte keine wirklich messbare kraft/moment in pitch oder roll messen too much noise
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1. Soll ich highpass filter verwenden um etwas zu erkennen? #question
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3. Äussere achse verbogen, kriege teil nicht weg: teil ist nachgeschickt worden von inigo, kommt morgen an
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4. Werde morgen mit alter testplatform und unterem propeller fixed pitch testen abzuheben.
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5. Neue motoren sollten morgen ankommen.
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# Probleme
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- Krasse vibrationen, vorallem wegen teststand, sobald mit virt-swash getestet wird.
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- Fixed blade holder ist kein problem, resonance peaks können übersprungen werden
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- Rcbench beschädigt?
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- Position sensor not perfectly mounted --> non-linear distortions
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- Create sensor calibration method (use stepper motor to control exact position?)
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- Non linar distortion induce vibrations
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- Vibrations
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- RCB mount too flexible
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- Props not perfectly balanced (3D prints are not precise)
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- Haven't found a good way to balace articulated lead-lag props
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- Actuation not perfect due to position sensor distortion (see above)
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Swash leveling
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[https://www.rchelicopterfun.com/blade-tracking.html](https://www.rchelicopterfun.com/blade-tracking.html)
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Animations
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[Coaxial Helicopter Rotor Animation](https://www.youtube.com/watch?v=akgJO5GCe6I)
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First tests until 15:21 (time) were with
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Second part: starting from 15.23 I used all default parameters.
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> [!caution] This page contained a drawing which was not converted.
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# Buylist
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- [ ] Grease, wd40
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- [ ] Metall röhrchen (ptfe,
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# Mechanical Part
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Blade holder pin to 11.5mm
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3.4mm
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10mm
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11.5mm
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4.5mm
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45°
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Problems:
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- Sinusoidal noise in the position encoder, as seen [here](https://www.melexis.com/en/product/MLX90324/Triaxis-mainstream-rotary-position-sensor-IC-Analog-PWM-SENT)
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- Do calibration and use calibration points to linearize output from position encoder.
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