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基于 SOC 职业分类
| name | fe-analyst-orcaflex-discretization |
| description | Sub-skill of fe-analyst: OrcaFlex Discretization (+3). |
| version | 1.0.0 |
| category | engineering |
| type | reference |
| scripts_exempt | true |
OrcaFlex segments are the mesh elements. Each segment has:
EI of the elementdef assess_mesh_quality(segment_lengths, OD, min_radius_of_curvature):
"""
Assess FE mesh quality for a slender structure.
Returns a dict of quality flags.
"""
L_max = max(segment_lengths)
L_min = min(segment_lengths)
ratio = L_max / L_min
# Rule 1: Segments should not be longer than ~5×OD in regions of high curvature
max_seg_high_curve = min_radius_of_curvature * 0.1 # ~10 segs per 90° arc
# Rule 2: Adjacent segment length ratio (gradual variation)
from itertools import pairwise
adjacent_ratios = [max(a, b) / min(a, b) for a, b in pairwise(segment_lengths)]
max_adj_ratio = max(adjacent_ratios)
# Rule 3: Minimum segment — avoid < OD/2 (over-discretized)
over_refined = any(L < OD / 2 for L in segment_lengths)
return {
"total_segments": len(segment_lengths),
"L_min_m": L_min,
"L_max_m": L_max,
"global_ratio": ratio,
"max_adjacent_ratio": max_adj_ratio, # flag if > 3.0
"over_refined_segments": over_refined,
"high_curvature_adequate": L_max <= max_seg_high_curve,
"pass": max_adj_ratio <= 3.0 and not over_refined and L_min > 0.01,
}
Mesh Summary:
┌─────────────────────┬──────────┬──────────┬──────────┬──────────┐
│ Region │ N segs │ L_min [m]│ L_max [m]│ Ratio │
├─────────────────────┼──────────┼──────────┼──────────┼──────────┤
│ Top section │ 20 │ 0.50 │ 1.00 │ 2.0 ✓ │
│ Mid catenary │ 150 │ 1.00 │ 2.00 │ 2.0 ✓ │
│ TDP zone │ 30 │ 0.25 │ 1.00 │ 4.0 ✗ │
│ Seabed section │ 50 │ 1.00 │ 2.00 │ 2.0 ✓ │
└─────────────────────┴──────────┴──────────┴──────────┴──────────┘
TOTAL: 250 segments | PASS: 3/4 regions
| Region | Guideline | Reason |
|---|---|---|
| TDP zone | ≤ 0.5 × D | Highest curvature, most critical for fatigue |
| Sag bend | ≤ 1.0 × D | Second-highest curvature |
| Free catenary | ≤ 5.0 × D | Low curvature — efficiency |
| Seabed (laid) | ≤ 3.0 × D | Axial walking, upheaval |
| Near clamp/BSJ | ≤ 0.2 × D | Local stress concentration |
| Mooring at fairlead | ≤ 2.0 × D | Curvature under vessel offset |
| Stinger (S-lay) | ≤ 0.5 × D | Bending control critical |