hopper_discharge_rate — DRIVE granular op

• Data kinds: signal × signal × scalar → table

• Call: import fullseye as fs; fs.ledger.hopper_discharge_rate(mass_below, times, mass_total: 'float', *, lo: 'float' = 0.2, hi: 'float' = 0.8) -> 'dict' (to call the implementation directly, import granular; granular.hopper_discharge_rate(mass_below, times, mass_total: 'float', *, lo: 'float' = 0.2, hi: 'float' = 0.8) -> 'dict'; from the registry, opsdrive.get("hopper_discharge_rate"))

Usage

> This operator's description has not been translated yet. The original text follows as it is.

底板より下の質量の列 `m(t) から排出率 [kg/s] —— 全質量の lo〜hi` の帯だけを直線で当てる(立ち上がりと

止まり際を除く; Beverloo の定常流の仮定)。返り: `rate, n_frames(帯のコマ数), t_range, rms` [kg]。

Raises `ValueError`: 帯に 3 コマ未満(排出が速すぎてコマが無い —— 黙って 2 点の傾きを返さない)/ 時刻が単調でない。

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 · spoon_tilt_critical

*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.