Quasi-Newton method for truss optimization problem.

版本 2.0.0 (24.3 KB) 作者: ibrahim aydogdu
This code is designed for solving the truss optimization problem with continuous design variables via quasi-Newton gradient methods.
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更新时间 2025/12/17

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This code is designed for solving the truss optimization problem with continuous design variables via quasi-Newton gradient methods. The problem firstly make gradient check to adapt the quasi-Newton gradient method to truss optimization problem. Then solve it using MATLAB fmincon tool.
Changelog:
  • Refactor (Objective Function): Stripped the penalty term from truss_objective.m. The function now returns the pure "Raw Weight," allowing fmincon to handle constraints natively via truss_constraints.m (nonlcon).
  • Feature (History Logging): Implemented a "Best-So-Far" (monotonic) filter in the fmincon_capture_penalized_history function. This prevents the logging of high-penalty (infeasible) spikes during the line-search process, resulting in a cleaner convergence graph.
  • Fix (3D FEM Analysis): Corrected the Degree of Freedom (DOF) mapping and the B-matrix size in truss_analysis_and_sensitivity.m to correctly support 3D truss structures (3 DOFs per node).
  • Improvement (Reporting): The script now manually calculates the "Penalized Weight" (W⋅(1+P)^2 for the final output, ensuring that QN results are directly comparable to GA results in the FeasibilityPerformance.txt report.

引用格式

ibrahim aydogdu (2025). Quasi-Newton method for truss optimization problem. (https://ww2.mathworks.cn/matlabcentral/fileexchange/182261-quasi-newton-method-for-truss-optimization-problem), MATLAB Central File Exchange. 检索时间: .

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版本 已发布 发行说明
2.0.0

This update refines the interaction between fmincon and the objective function, fixes 3D FEM formulation details, and improves the convergence history logging to prevent infeasible spikes.
1.0.0