{ "case": "BESO airplane bearing bracket", "scope": "Numerical comparison on the downloadable coarse mesh; header animation shows a separate finer CAD mesh.", "reference": { "title": "CalculiX BESO Example 3, downloadable coarse case", "url": "https://github.com/calculix/beso/wiki/Example-3:-airplane-bearing-bracket", "archive_url": "https://raw.githubusercontent.com/calculix/beso/master/wiki_files/example_3/work_files.zip", "archive_sha256": "1e95e16148f6931e4317ffd3bd654f956b0df210528e2b1e6d94b0eb20be682a", "state_file": "analysis_files/file073.vtk", "iteration": 73, "elements": 14027, "filter_radius_m": 0.01 }, "setup": { "material": { "E": 200000000000.0, "nu": 0.27, "rho": 7833.0 }, "loads_N": [ [ 281, 0, 0 ], [ 298, -298, 0 ], [ 0, -562, 0 ] ], "bearing_reference_m": [ 0.1016, -0.00207, 0 ], "target_design_mass_fraction": 0.1, "optimizer": { "kind": "structural_topology", "name": "Structural Topology Optimization", "mesh_id": null, "objective": "compliance", "volume_fraction": 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Topology overlap is reported separately. This criterion does not assert optimization convergence.", "coarse_run": { "iterations": 66, "reason": "oscillation", "converged": false, "history": [ { "iteration": 1, "objective": 0.028113880165591406, "constraints": { "volume_fraction": 9.0 }, "design_change": 1.0, "continuation": { "evaluated_design_mass_fraction": 1.0, "maximum_failure": 0.04515873194821115, "maximum_design_failure": 0.03338006861167317, "design_mass_fraction": 0.9197997348748137, "failures": 0, "frozen": false } }, { "iteration": 2, "objective": 0.028290171793205872, "constraints": { "volume_fraction": 8.197996546744685 }, "design_change": 1.0, "continuation": { "evaluated_design_mass_fraction": 0.9197997348748137, "maximum_failure": 0.04652532642841182, "maximum_design_failure": 0.03338006931424096, "design_mass_fraction": 0.8830477618711358, "failures": 0, "frozen": false } }, { "iteration": 3, "objective": 0.028495179531375623, "constraints": { "volume_fraction": 7.830476449187807 }, "design_change": 1.0, 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the published download.", "Reference-design compliance is computed by Torso; no independently published CalculiX compliance value is claimed.", "Torso coarse run stopped on a two-cycle oscillation; the finer run reached its iteration limit.", "The reference five-iteration mean failure-index stopping test is not implemented in the current Torso BESO optimizer.", "Connectivity, manufacturability and fatigue are not acceptance criteria for this comparison." ] }