mdr_spring_bed — DRIVE tacdome op

• Data kinds: scalar × scalar × table → table

• Call: import fullseye as fs; fs.ledger.mdr_spring_bed(delta: 'float', L: 'float', lin: 'dict', n_springs: 'int' = 4000) -> 'dict' (to call the implementation directly, import tacdome; tacdome.mdr_spring_bed(delta: 'float', L: 'float', lin: 'dict', n_springs: 'int' = 4000) -> 'dict'; from the registry, opsdrive.get("mdr_spring_bed"))

Usage

Directly integrates a 1D array of nonlinear springs with the midpoint rule (second (independent) implementation of the closed forms largedef_correction / largedef_radius_ratio).

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

ばね x ∈ [0, a_L] (片側、力は 2 倍): MDR の断面 g = g_coef·xᵖ、長さ ℓ = L − g、伸び λ = (L − δ)/ℓ、力 E*·dx·ℓ·(λ⁻² − λ)/3 (線形の極限で E*·dx·(δ − g) = MDR)、幅は λ^{−1/2} 倍。平頭は g = 0(全部 λ = 1 − d)。返り: x・g・length・ stretch・width_factor・x_deformed(幅の累積 = 変形後の位置)・F・F_lin・kappa(= F/F_lin)・a・ radius_ratio(= a/a_L)・strain_max・spring_force(dF/dx)。Raises ValueError: n_springs < 16、δ/L が (0, 1) 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_tacdome_large_deformation — py -3.11 examples/poc_tacdome_large_deformation.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 (tacdome)

powerlaw_linear_contact · largedef_correction · largedef_radius_ratio · largedef_universal_correction · large_deformation_contact · large_deformation_inverse · neohookean_cylinder_exact · hertz_small_strain_error


*Provenance: tacdome.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.