powder_flowability_class — DRIVE granular op

• Data kinds: scalar → table

• Call: import fullseye as fs; fs.ledger.powder_flowability_class(phi_deg: 'float') -> 'dict' (to call the implementation directly, import granular; granular.powder_flowability_class(phi_deg: 'float') -> 'dict'; from the registry, opsdrive.get("powder_flowability_class"))

Usage

Angle of repose → flowability class (USP <1174> Table 1, original source Carr 1965).

> The detailed description below is the original text — the summary and the headings are translated.

返り: cls(excellent / good / fair / passable / poor / very poor / very, very poor)、phi_int(表を引いた整数の度 = 四捨五入)、tabulated(表の下限 25 度以上か)、band_upper_deg(その区分の上限; 上限の無い最後の区分は None —— 返りに inf を入れない、JSON に載らないため)。表は整数の度なので 30.5 は 31(good)、30.4 は 30(excellent)。Raises ValueError: 角が (0, 90) の外。

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• poc_granular_heap_repose — py -3.11 examples/poc_granular_heap_repose.py

Ops the type connects to (they accept table as input)

course_layout · course_occupancy · course_contains · world_build · world_camera · world_move · lidar_scan · rss_longitudinal_same

Same category (granular)

heap_volume_cone · heap_mass · heap_volume_heightmap · beverloo_rate · beverloo_fit · discharge_synth · dispense_mass_from_video · hopper_discharge_rate

*Provenance: granular.py — DRIVE operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.