loading page

Solving Singular Control Problems using Uniform Trigonometrization Method
  • Kshitij Mall,
  • Ehsan Taheri,
  • Prathamesh Prabhu
Kshitij Mall
Auburn University

Corresponding Author:[email protected]

Author Profile
Ehsan Taheri
Auburn University
Author Profile
Prathamesh Prabhu
Purdue University
Author Profile


This study investigates the application of a recently developed construct, the Uniform Trigonometrization Method (UTM), to the singular control problems in chemical engineering. The UTM involves minimal modifications to the original problem, thereby generating near-singular control solutions that can be used for conceptual design and serve as an alternate to direct techniques like nested and simultaneous approaches. Eight classical singular control problems with known analytical solutions and three complex singular control problems from chemical engineering domain are solved in this study. The results obtained using the UTM for these problems are found to match well with the literature and are of higher resolution as compared to the results obtained using a direct pseudospectral based solver. The ability of the UTM to handle complex chemical engineering problems with both singular controls and state path constraints has also been demonstrated in this study.
26 May 2020Submitted to AIChE Journal
29 May 2020Submission Checks Completed
29 May 2020Assigned to Editor
03 Jun 2020Reviewer(s) Assigned
22 Jul 2020Editorial Decision: Revise Major
06 Sep 20201st Revision Received
08 Sep 2020Submission Checks Completed
08 Sep 2020Assigned to Editor
13 Sep 2020Reviewer(s) Assigned
21 Dec 2020Editorial Decision: Revise Minor
30 Dec 20202nd Revision Received
01 Jan 2021Submission Checks Completed
01 Jan 2021Assigned to Editor
10 Jan 2021Editorial Decision: Accept
Jun 2021Published in AIChE Journal volume 67 issue 6. 10.1002/aic.17209