discharge_synth — DRIVE `granular` op

• Data kinds: scalar × scalar × scalar × scalar × scalar × scalar → table

• Call: import fullseye as fs; fs.ledger.discharge_synth(D0: 'float', d: 'float', bulk_density: 'float', phi_deg: 'float', pitch: 'float', duration: 'float', n_frames: 'int' = 8, grid: 'int' = 256, C: 'float' = 0.58, k: 'float' = 1.4, noise: 'float' = 0.0, seed: 'int | None' = None) -> 'dict' (to call the implementation directly, import granular; granular.discharge_synth(D0: 'float', d: 'float', bulk_density: 'float', phi_deg: 'float', pitch: 'float', duration: 'float', n_frames: 'int' = 8, grid: 'int' = 256, C: 'float' = 0.58, k: 'float' = 1.4, noise: 'float' = 0.0, seed: 'int | None' = None) -> 'dict'; from the registry, opsdrive.get("discharge_synth"))

Usage

Synthesizes a sequence of heightmaps in which powder falling from a circular orifice D0 at the Beverloo rate piles up below into a cone with angle of repose φ.

V(t) = W t / ρ_b, R(t) = (3 V / (π tan φ))^{1/3}. Returns: frames (n_frames frames, (grid, grid) [m]), times [s], W (true rate [kg/s]), masses (sequence of true masses). noise = σ [m] of Gaussian noise added to the height map (a stand-in for range-sensor noise; since the ground also fluctuates, the volume is clipped at 0 and biased —— that bias is measured by the gate). If the pile extends beyond the grid, ValueError (the volume is not silently truncated).

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 · dispense_mass_from_video · hopper_discharge_rate · spoon_tilt_critical

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

discharge_synth — DRIVE granular op