News
2023
September
Congratulations to Amit and Maia for passing the Ph.D. Qualifying Exams!
Our journal article "Fundamental Investigation into Output-Based Prediction of Whirl Flutter Bifurcations" has been accepted for publication in the Journal of Fluids and Structures (the first article from our group!). This article reports the first investigation of bifurcation forecasting, an output-based approach to predicting bifurcation diagrams based on pre-flutter transient responses, in the context of whirl flutter for an isolated propeller-nacelle system. Additionally, the paper presents the first comprehensive error analysis of bifurcation forecasting for a wide range of output data choices and of the strength of the smooth structural nonlinearities. [Preprint]
Cristina gives an invited seminar in the Department of Mechanical Engineering at the University of California, Merced.
August
Amit has been selected to attend the NextProf Pathfinder workshop at the University of Michigan this October.
Tarun defends his M.S. thesis proposal on track to completing the M.S. portion of his B.S./M.S. degree this December.
July
Aniela receives a Presidential Undergraduate Research Award supporting her research on the aeroelasticity of very flexible wings this Fall.
June
Cristina attends the second University of Maryland's High-Speed Rotorcraft Workshop.
Cristina is one of the 35 recipients of the Oak Ridge Associated Universities (ORAU) Ralph E. Powe Junior Faculty Enhancement Award. [ORAU News][GTAE News]
May
Cristina is elected a member of the Vertical Flight Society Dynamics Technical Committee.
Todd (B.S.A.E.), Lauren (B.S.M.E.), and Jouwairia (M.S.A.E.) are our first graduates. Congratulations!
April
Cristina attends the Aerospace Flutter and Dynamics Council meeting at NASA Langley Research Center.
Our journal article "Geometrically Nonlinear Effects in Wing Aeroelastic Dynamics at Large Deflections" has been accepted for publication in the Journal of Fluids and Structures. This paper reports an investigation of the impact of nonlinear kinematics and follower aerodynamics on the Pazy wing benchmark case we have studied under the frame of the aeroelastic prediction workshop. [Link][Preprint]
Our journal article "Bifurcation-Diagram-Free Post-Flutter Response Constraint for Design Optimization" has been accepted for publication in the AIAA Journal. This paper reports a new methodology to constrain post-flutter responses (limit-cycle oscillations) in design optimization by bounding the recovery rate to equilibrium. We demonstrated the methodology by optimizing a basic typical section model with an initially subcritical bifurcation, showing that the optimizer is able to shift the flutter point and reshape the bifurcation diagram with no need to compute it explicitly. [Link] [Preprint]
March
Todd delivers his brown-bag presentation "Streamlining Whirl Flutter Prediction Considering Multiple Varying Parameters" to qualify for our B.S./M.S. program.
February
Our journal article "High-Fidelity Gradient-Based Wing Structural Optimization Including Geometrically Nonlinear Flutter Constraint" has been accepted for publication in the AIAA Journal. This paper reports the first structural optimization of a detailed wing model including a flutter constraint that accounts for geometrically nonlinear effects associated with large static aeroelastic deflections. The work is a prequel to the paper below, though accepted later. [Link][Preprint]
January
Our journal article "High-Fidelity Aerostructural Optimization with a Geometrically Nonlinear Flutter Constraint" has been accepted for publication in the AIAA Journal. This paper reports the first aerostructural optimization of a detailed wing model including a flutter constraint that accounts for geometrically nonlinear effects associated with large static aeroelastic deflections. The work is part of our previous collaboration with the University of Michigan MDOlab under the frame of the Airbur-Michigan Center for Aero-Servo-Elasticity of Very Flexible Aircraft. [Link][Preprint]
We present three new conference papers at the AIAA SciTech Forum in National Harbor:
Gali, Goehmann, and Riso, "Predicting Whirl Flutter Bifurcations Using Pre-Flutter Output-Data" (first publication all from our group!) [Link][Preprint][Recording]
Riso and Cesnik, "Investigation of Geometrically Nonlinear Effects in the Aeroelastic Behavior of a Very Flexible Wing" [Link][Preprint][Recording][Data]
Sanghi, Cesnik, and Riso, "Roll Maneuvers of Very Flexible Aircraft with Flared Folding Wingtips" [Link][Preprint][Recording]
Cristina attends the Third AIAA Aeroelastic Prediction Workshop (AePW3) held in conjunction with the AIAA SciTech Forum. Cristina has been a contributor to the Large Deflection Working Group, which focused on investigating our current ability to predict flutter boundaries of very flexible wings. [AePW3 website]
Our journal article "Impact of Low-Order Modeling on Aeroelastic Predictions for Very Flexible Wings" accepted in 2022 has been published online in the Journal of Aircraft. [Link][Preprint][Data][Twitter Thread]
2022
December: Cristina contributes to a news article by the Georgia Tech College of Engineering providing an outlook on 2023. [Link]
December: Our group is awarded funding for two new one-year collaborative projects by the Georgia Tech AE Fellows program:
"Constraining Limit-Cycle Oscillations in Gradient-Based Design Optimization" in collaboration with Dr. Graeme Kennedy
"Hypersonic Magnetohydrodynamic Actuation for Entry, Descent, and Landing" in collaboration with Drs. Alvaro Romero-Calvo and Joe Oefelein
December: Cristina co-authors Aerospace America's Year in Review article highlighting the 2022 achievements of the structural dynamics community. The article highlights five major experimental efforts in developing and testing new aeroelastic demonstrators. [Link]
November: Cristina and Vishal attend the first GT VLRCOE Annual Review of the 2021-2016 cycle, presenting the accomplishments for Task 8.
October: Cristina serves on the panel "Launching into Grad School with WoAA and AIAA" hosted by WoAA and AIAA. The panel discussed a range of topics related to applying for and succeeding in Ph.D. programs. [Event Link]
October: Cristina gives a talk in the Department of Mechanical, Aerospace, and Biomedical Engineering at the University of Tennessee, Knoxville entitled "Predicting Wing Self-Excited Oscillations for Designing the Next Generation of Aircraft."
September: Our journal article "Impact of Low-Order Modeling on Aeroelastic Predictions for Very Flexible Wings" has been accepted for publication in the Journal of Aircraft. This paper reports an extensive aeroelastic model fidelity study for very flexible wings conducted by Cristina in collaboration with Carlos Cesnik (U-M) as part of their work under the Third Aeroelastic Prediction Workshop Large Deflection Working Group.
September: Cristina attends the AIAA Structural Dynamics Technical Committee Mid-Year meeting hosted at the University of Maryland, College Park.
August: Amit is the second Ph.D. student to join the group! Maia also joins the group as a Ph.D. student.
July: Divya (former U-M mentee) defends her Ph.D. dissertation "Maneuverability, Load Alleviation, and Ride Qualities in Transonic High-Aspect-Ratio-Wing Aircraft" based on five years of hard work in partnership with Airbus Flight Physics. Congratulations Dr. Sanghi! [Post]
July: Cristina attends the Closure Meeting of the Airbus-Michigan Center for Aero-Servo-Elasticity of Very Flexible Aircraft at Airbus Toulouse, France. This event concludes five years of partnership with Airbus Flight Physics on developing computational aeroelasticity tools for future aircraft.
June: We present three new conference papers at the International Forum on Aeroelastic and Structural Dynamics in Madrid: [Conference Website]
Riso and Cesnik, "Post-Flutter Analysis of the Pazy Wing Geometrically Nonlinear Benchmark Model" [Preprint][Data]
Sanghi, Riso, Cesnik, and Vetrano, "Analysis of Ride Qualities in Transonic High-Aspect-Ratio-Wing Aircraft" [Preprint]
Gray, Riso, Jonsson, Martins, and Cesnik, "High-Fidelity Aerostructural Optimization with a Geometrically Nonlinear Flutter Constraint" [Preprint]
May: Our article "Estimating Flutter Bifurcation Diagrams Using the State Velocity" is published in the AIAA Journal. [Link][Preprint]
May: Cristina becomes an NSF Panel Fellow for completing the 2022 edition of the NSF CMMI Game Changer Academies (CGCA) Program. [Certificate]
May: Vishal is the first Ph.D. student to join the group! He will work on our project "Whirl Flutter and Stability Analysis for Advanced VTOL Concepts" under the frame of the 2021–2026 Georgia Tech Vertical Lift Center of Excellence (VLRCOE).
January: We present three new conference papers at the AIAA SciTech Forum in San Diego:
Riso and Cesnik, "Low-Order Geometrically Nonlinear Aeroelastic Modeling and Analysis of the Pazy Wing Experiment" [Link][Preprint][Recording][Data]
Jonsson, Riso, Monteiro, Gray, Martins, and Cesnik, "High-Fidelity Gradient-Based Wing Structural Optimization Including a Geometrically Nonlinear Flutter Constraint" [Link][Preprint][Recording]
Sanghi, Riso, Cesnik, and Vetrano, "Conventional and Unconventional Control Effectors for Load Alleviation in High-Aspect-Ratio-Wing Aircraft" [Link][Preprint][Recording]
January: Cristina joins the Daniel Guggenheim School of Aerospace Engineering at Georgia Tech as a tenure-track Assistant Professor.
2021
December: Cristina gives virtual seminars on "Predicting Flutter Bifurcations for Designing Future Aircraft" at:
Department of Aerospace Engineering Sciences and Technologies at the Polytechnic University of Milan
Department of Mechanical and Aerospace Engineering at Sapienza University of Rome
October: Cristina is selected for the 2022 edition of the NSF CMMI Game Changer Academies (CGCA) Program. [Program Website]
August: We present a new paper at the AIAA AVIATION Forum (virtual due to COVID-19):
July: Our first grant "Whirl Flutter and Stability Analysis for Advanced VTOL Concepts" is selected for funding by the U.S. Army, U.S. Navy, and NASA under the frame of the 2021–2026 Georgia Tech Vertical Lift Center of Excellence (VLRCOE) Award! [News Article]
June: Cristina serves as an invited panelist for NextProf Engineering. [Program]
May: Cristina is selected as a member of the AIAA Structural Dynamics Technical Committee.
March: Cristina will join the Daniel Guggenheim School of Aerospace Engineering at Georgia Tech as an Assistant Professor in January 2022!
January: Cristina gives virtual seminars on "Modeling of Flight Dynamics and Nonlinear Aeroelasticity for Designing Next-Generation Aircraft" at:
Department of Mechanical and Aerospace Engineering at the University of Central Florida
Daniel Guggenheim School of Aerospace Engineering at Georgia Tech
January: We present a new paper at the AIAA SciTech Forum (virtual due to COVID-19)