Rais-Rohani: Reduced Order & Surrogate Modeling Research - Mechanical Engineering

UMaine Alert

Posted: April 19, 2024 - 1:32 PM

At approximately 9:24 a.m. on Friday, April 19, a University of Maine graduate student was struck by a university vehicle on Long Road at the University of Maine campus in Orono. The student reports that they are at a local hospital with minor injuries.

Emergency services, including the Orono Fire Department, University Volunteer Ambulance Corps, University of Maine Police Department, Orono Police Department and Penobscot County Sheriff’s Office responded to the scene.

The university vehicle involved in the incident was a Chevrolet Express van. It was being operated by a university employee.

Counseling services and support are available for students, faculty or staff who may have been affected. The Counseling Center can be reached at 207-581-1392 and the Dean of Students Office can be reached at 207-581-1406.

The scene has been cleared and Long Road is now accessible. An investigation is being conducted by the University of Maine Police Department with assistance from the Penobscot County Sheriff’s Office Crash Reconstruction Unit. Any witnesses to the incident are encouraged to contact Lt. Noel Santiago at noel.santiago@maine.edu.

Masoud Rais-Rohani: Reduced Order & Surrogate Modeling Research

The goal of this research is to facilitate simulation-based design optimization involving computationally expensive and often noisy responses using both parametric and non-parametric surrogate-modeling (metamodeling) techniques and to develop a new approach based on an optimized ensemble of surrogate models.

Highlights of research sponsored by DOE, NASA and ERDC:

Surrogate-based optimization of automotive structures under multiple design criteria
Ensemble of metamodels with weight factors optimized using alternative cross validation metrics
Surrogate modeling in multi-objective optimization

Surrogate Modeling of Crash-Induced Responses graphic

A full-frontal or side impact simulation for estimation of a response function (e.g., peak acceleration, intrusion distance) could take several hours on a computer cluster. Through surrogate modeling, a smooth and computationally efficient representation of each response function can be generated. Such models can be extremely helpful in both trade space exploration and design optimization pursuits.

Publications:

Parrish, J., Rais-Rohani, M., and Janus, M., “Reduced Order Techniques for Sensitivity Analysis and Design Optimization of Aerospace Systems,” AIAA Journal, Vol. 53, No. 12, pp. 3567-3576, 2015.
Parrish, J., Rais-Rohani, M., and Janus, M., “Application of Reduced Order Techniques for Sensitivity Analysis to Multidisciplinary Aerospace Systems,” AIAA SciTech 2015: 56^th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Kissimmee, FL, Jan 5-9, 2015.
Parrish, J., Rais-Rohani, M., and Janus, M., “Reduced Order Techniques for Sensitivity Analysis and Design Optimization of Aerospace Systems,” AIAA SciTech 2014: 10^th AIAA Multidisciplinary Design Optimization Specialist Conference, National Harbor, MD, Jan 13-17, 2014.
Kiani, M., Gandikota, I., Parrish, A., Motoyama, K., and Rais-Rohani, M., “Surrogate-Based Optimisation of Automotive Structures Under Multiple Crash and Vibration Design Criteria,” International Journal of Crashworthiness, Vol. 18, No. 5, pp. 473-482, 2013.
Acar, E. and Rais-Rohani, M., “Ensemble of Metamodels with Optimized Weight Factors,” Structural and Multidisciplinary Optimization, Vol. 37, No. 3, pp. 279-294, 2009.
Acar, E. and Rais-Rohani, M., “Ensemble of Metamodels with Optimized Weight Factors,” 4^th AIAA Multidisciplinary Design Optimization Specialists Conference, Schaumburg, IL, Apr 7-10, 2008.
Fang, H., Rais-Rohani, M., Liu, Z., and Horstemeyer, M., “A Comparative Study of Metamodeling Methods for Multi-objective Crashworthiness Optimization,” Computers and Structures, Vol. 83, pp. 2121-2136, 2005.
Rais-Rohani, M. and Singh, M., “Comparison of Global and Local Response Surface Techniques in Reliability-Based Optimization of Composite Structures,” Structural and Multidisciplinary Optimization, Vol. 26, No. 5, pp. 333-345, 2004.
Fang, H., Rais-Rohani, M., and Horstemeyer, M.F., “Multi-objective Crashworthiness Optimization with Radial Basis Functions,” 10^th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, Albany, NY, Aug 30-Sep 1, 2004.
Rais-Rohani, M. and Singh, M. N., “Efficient Response Surface Approach for Reliability Estimation of Composite Structures,” AIAA-2002-5604, 9^th AIAA/ISSMO Symposium on Multidisciplinary Analysis and Optimization, Atlanta, GA, Sep 4-6, 2002.
Su, B., Rais-Rohani, M., and Singh, M. N., “Reliability-Based Optimization of Anisotropic Cylindrical Shells with Response Surface Approximations of Buckling Instability,” AIAA-2002-1386, 43^rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Denver, CO, Apr 22-25, 2002.