https://itohi.com/tags/vibration/Recent content in Vibration on ITOHI — Open-Source Hardware, Embedded Systems & DIY BuildsHugo -- gohugo.ioen2022 @ ITOHI - All rights reservedThu, 13 Aug 2026 00:00:00 +0000https://itohi.com/fpv/meteor75-pro-ii-fighting-resonances/Thu, 13 Aug 2026 00:00:00 +0000https://itohi.com/fpv/meteor75-pro-ii-fighting-resonances/ <!-- DRAFT NOTES FOR ANDRIUS — delete this comment block before publishing. 1. TITLE / DATE — still yours to confirm. series is [FPV Builds] to match the other FPV posts, thumbnail is meteor75-pro-vs-pro-ii.jpg. Both language files match on series and thumbnail. 2. LITHUANIAN TERMINOLOGY — needs your review. Five coinages I could not validate, all in index.lt.md: - "vibracijos gaubtinė" (vibration envelope) - "struktūrinė moda" (structural mode) - "atsako dozė" (dose-response) - "prisukta masė" (sprung mass) - "struktūrai fiksuota ypatybė" (structure-fixed feature) Betaflight parameter names and metric labels are deliberately left in English throughout — intentional, not an oversight. 3. NUMBERS STATED TWO WAYS — RESOLVED. Rather than silently picking one value, the opening of "Method notes worth keeping" now names the two analysis windows and explains every apparent disagreement: - 34.8/24.6 vs 34.5/24.5, +66% vs +65%, 0.789% vs 0.812%, 0.04% vs 0.076% -> different impact-exclusion pad or a different log, not a correction - foam post-filter roll 0.50 vs 0.67 deg/s -> two different metrics (Welch above 60 Hz vs an 80-780 Hz bandpass RMS) - the two five-mount sets (37.7/26.2/33.0/30.1/41.0 and 38.3/26.0/31.0/26.6/42.5) -> outdoor RPM-binned vs steady-flight throttle-banded windows The intro now says "seven of them, itemised later" and matches the seven H3s under "Everything I got wrong". The stray "wrong for the fifth time" is gone. 4. chart8 in snake-chart-data.json (outside this folder) had a stale "Peak 48.8 -> 28.0 deg/s (-43%)" annotation. Already corrected there; the retired figure survives only in a _retracted metadata field as an audit trail, so regenerating from the JSON will not reintroduce it. 5. EXIF — GPS IFD removed from all five photos, remaining tags kept per the GPS-only rule. Verified before committing. 6. TONE — all four photographs were rebuilt from the originals with anchored monotone L-channel curves, not brightness multiplication. Every one passes the verification gate. The screenshot is deliberately uncurved. --> <p>Craft name <strong>Snake</strong>. It started life as a Meteor75 Pro, and it is now a Meteor75 Pro II — frame and canopy ordered off AliExpress, everything expensive carried straight over. Same <strong>Matrix 1S 3-in-1 FC</strong>. Same <strong>narrow-FOV DJI O4</strong> air unit. New shell, old guts, and by the time I was done, 169 flights and 15,574 seconds of logs to argue with.</p>