arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1810.04059math.OCcs.SYeess.SY
收藏

具有收敛保证的动态优化

Dynamic Optimization with Convergence Guarantees

Imperial College London(帝国理工学院)

Martin P. Neuenhofen, Eric C. Kerrigan

AI总结:

本文提出了一种新颖的直接转录方法来求解带有非线性微分和不等约束的优化问题,通过合理的 mild 假设证明了数值方法的收敛性,无需唯一性、可微性或约束资格,并避免使用拉格朗日乘数,采用惩罚-屏障方法,通过有限元和惩罚-屏障内点非线性规划求解器进行数值最小化,即使解的组成部分不连续也能推导收敛阶结果,并通过数值实验验证了方法的有效性。

摘要:

我们提出了一种新颖的直接转录方法来求解受非线性微分和不等约束影响的优化问题。我们在合理轻微的假设下证明了数值方法的收敛性:问题定义函数的有界性和利普希茨连续性。我们不需要唯一性、可微性或约束资格成立,并避免使用拉格朗日乘数。我们的方法与基于插值的已知方法有根本不同;我们采用惩罚-屏障方法,在等式路径约束和点约束上计算积分二次惩罚,在不等式路径约束上计算积分对数屏障。所得到的惩罚-屏障函数可以使用有限元和惩罚-屏障内点非线性规划求解器进行数值最小化。即使解的组成部分不连续,也能推导出收敛阶结果。我们还通过数值结果将我们的方法与插值方法进行比较。数值结果表明,对于相同次数和网格,计算成本相似,但新方法可以在插值方法失败的情况下实现更小的误差并收敛。

英文摘要:

We present a novel direct transcription method to solve optimization problems subject to nonlinear differential and inequality constraints. We prove convergence of our numerical method under reasonably mild assumptions: boundedness and Lipschitz-continuity of the problem-defining functions. We do not require uniqueness, differentiability or constraint qualifications to hold and we avoid the use of Lagrange multipliers. Our approach differs fundamentally from well-known methods based on collocation; we follow a penalty-barrier approach, where we compute integral quadratic penalties on the equality path constraints and point constraints, and integral log-barriers on the inequality path constraints. The resulting penalty-barrier functional can be minimized numerically using finite elements and penalty-barrier interior-point nonlinear programming solvers. Order of convergence results are derived, even if components of the solution are discontinuous. We also present numerical results to compare our method against collocation methods. The numerical results show that for the same degree and mesh, the computational cost is similar, but that the new method can achieve a smaller error and converges in cases where collocation methods fail.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑