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Chris Leshikar successfully defended his Ph.D. dissertation on May 28th, 2025.  Chris has been with VSCL since his freshman year in Fall 2016 setting the record for longest duration working in VSCL of 8.83 years. The title of his dissertation is: Markov Parameter Based Methods for System Identification

Chris’s dissertation investigates modifying and extending subspace system identification methods for flight vehicle system identification. The development of accurate dynamical models of flight vehicles is a critical aspect of ensuring overall safety of flight. The development of accurate models using flight data requires the utilization of system identification techniques, which are often denoted as white-box or black-box models. This dissertation develops an approach which extends the Eigensystem Realization Algorithm, a black-box, Markov Parameter based subspace identification method, which permits the inclusion of prior model knowledge, the computation of parameter confidence bounds, and direct identification of continuous-time matrices. This is accomplished by the inclusion of the output model structure which results in a recursive Markov Parameter definition which may be reformulated into the ordinary least squares problem using the Markov Parameters. The effects of process and measurement noise, sampling rate, and data filtering on the developed approach are investigated using a simple second-order system. The theory is further extended for the identification of non-dimensional stability & control derivatives. The benefits of the approach in identifying open-loop models from closed-loop data are also presented. The developed technique is evaluated against standard flight vehicle system identification methods using experimental flight test data of multirotor and fixed-winged Unmanned Air Systems, a fixed-wing manned transport aircraft, and a supersonic commercial transport aircraft.

Chris will do a short postdoc with VSCL and then begin seminary formation for the Catholic Diocese of Victoria later this year. Chris’s research is supported by the National Science Foundation under the Center for Autonomous Air Mobility and Sensors (CAAMS). Chris’s is the 63^rd graduate degree that Dr. John Valasek has advised, and 16th Ph.D. student.

Hannah Lehman successfully defended her Ph.D. dissertation on May 27th, 2025.  Hannah has been with VSCL since her freshman year in Spring 2017, for a total of 8.42 years with VSCL during which she implemented the Theory-Computation-Experiment paradigm. The title of her dissertation is: Hierarchical Auctions for the Coordination of Heterogeneous Agents using Machine Learning

Hannah’s dissertation investigates autonomous multiagent coordination.  Machine learning has long been discussed as a candidate for facilitating autonomous multiagent vehicle coordination. Many methods of autonomous multiagent coordination have been proposed, however few if any solutions consider realistic communication challenges. By using machine learning on multiple levels, and a self organizing hierarchical system, an autonomous, pseudo decentralized, heterogeneous, system can dynamically complete tasks without being fully connected. This approach, called Hierarchical Auctions for the Coordination of Heterogeneous Agents (HACHA) will be investigated and demonstrated on four simple, proof of concept simulations. Each simulation scenario is designed to demonstrate HACHA’s applicability to a different subset of multiagent problems and address specific requirements. Within HACHA, specific algorithm and data choices will be motivated real-world hardware constraints and informed by time complexity analysis of sub-algorithms. Results show that a parallel auction coordination framework can be used to organize multiple heterogeneous agents with different sensors, movement modalities, graph connectedness, and controllers to complete a task requiring multiple agents. The auction framework is independent of individual agents and has been utilized in this paper by a combination of reinforcement learning trained agents and optimally controlled agents to complete tasks. HACHA auction propagation methods are explored and recommended use case rules are developed based on theoretical and computational investigations and results. The HACHA auction choice is explored and compared to other popular auction methods over a variety of relevant network characteristics including dynamicism, sparsity, and number of tasks.

Hannah will be doing a short postdoc with VSCL and then starting full-time at Sandia National Laboratories, where she has now done four graduate internships, in July. Hannah’s is the 62^nd graduate degree advised by Dr. John Valasek and the 15^th Ph.D. student.

VSCL is proud to welcome two new graduate research assistants:

Sadie Binz is a recent graduate of Texas A&M University with a Bachelor of Science in Aerospace Engineering. During her undergraduate studies, she was a member of Sigma Gamma Tau, the Aerospace Engineering Honor Society, and the SAE Aero Design Team, as well as an intern at Bell Helicopter. From this experience, Sadie developed an interest in flight testing and hopes to obtain her private pilot’s license in the future. She has undergraduate research experience in VSCL, primarily in system identification, and is excited to continue researching in VSCL as a graduate student pursuing a A Master of Science degree.

 

 

Raul Santos graduated from Texas A&M University in Spring 2025 with a Bachelor’s in Aerospace Engineering with minors in Computer Science and Mathematics. As an undergraduate, he co-founded the Society of Sonic Flight Engineers and began working with the VSCL as an undergraduate assistant. Raul has interned at Albers Aerospace with their Digital Engineering team as a Systems Engineering Intern, and at the Air Force Research Laboratory as a Safe Autonomy Intern with their Autonomy Capability Team. These experiences have motivated Raul to continue pursuing his interests in flight testing and aerospace autonomy as a graduate assistant researcher at the VSCL, beginning Fall 2025.

Congratulations to the VSCL undergraduate research assistants who graduated with a Bachelor of Science in Aerospace Engineering from Texas A&M University on May 9th 2025!

VSCL Undergraduate Carla Zaramella graduated in December 2024 with her Bachelor of Science degree in Aerospace Engineering. Carla will be joining VSCL as a Masters student starting in Spring 2025. She has been an active member of VSCL since January 2022 and has contributed towards the System Identification project and aided with Flight Testing. Carla has interned with Raytheon Technologies over the last two summers, working on land/air radar defense systems.

In October Dr. John Valasek reached a career milestone by presenting at his 100th invited seminar/lecture/panelist.

Chronologically:

#1 “Fighter Agility Metrics, Research, and Test,” Lockheed Advanced Development Projects Division (Skunk Works), Burbank, CA, 13 July 1990.

#100 “Multiple-Time-Scale Nonlinear Output Feedback Control of Systems With Model Uncertainties,” Department of Aerospace Engineering, University of Maryland, College Park, MD, 9 October 2024.

Congratulations Dr. Valasek!

Cassie-Kay McQuinn graduated with her MS degree in aerospace engineering. Cassie is the 60th graduate student advised to completion of their degree by Dr. Valasek, and the title of her thesis is “Online Near-Real Time Open-Loop System Identification from Closed-Loop Flight Test Data”. This work is sponsored by the National Science Foundation (NSF) Center for Autonomous Air Mobility & Sensing (CAAMS) as one part of the project “Integration of System Theory with Machine Learning Tools for Data Driven System Identification”. Cassie investigated identifying state-space linear dynamic models generated onboard in near-real time, for vehicles with and without an active flight controller.

Cassie is continuing on to the PhD with VSCL, and her dissertation will be based upon work she has been conducting on STARS (Safe Trusted Autonomy for Responsible Spacecraft) during a year-round internship for the Air Force Research Laboratory.

        

In conjunction with Dr. Moble Benedict (AVFL Lab – TAMU), Dr Puneet Singla (CASS Lab – Penn State), and Dr. Randy Beard (MAGICC Lab – BYU), Dr. Valasek presented the current updates of the System Identification project at the National Science Foundation (NSF) CAAMS Summer Industry Advisory Board Meeting.

The project “Integration of System Theory with Machine Learning Tools for Data Driven System Identification” integrates system theory with machine learning tools for data driven system identification. The objective is to derive nonlinear dynamical models by employing a unique handshake between linear time varying subspace methods and sparse approximation tools from high fidelity flight simulations and flight experiments.

The center is a partnership between academia, industry, and government to offer pre-competitive research in autonomous air mobility and sensing. Pictured (left to right) are Undergraduate Researcher Halle Vandersloot, PhD student Cassie-Kay McQuinn, Dr. Valasek, and TAMU AERO alum and VP of Engineering of VectorNav Dr. Jeremy Davis.

VSCL hosts Mr. Clay Chen, an entrepreneur interested in UAS systems. Mr. Chen met with VSCL lab director Dr. Valasek and VSCL graduate and undergraduate students  to discuss the UAS research and platform developments that VSCL conducts at the flight testing facility.

Many students of the Texas A&M Vehicle Systems & Control Laboratory have been selected for offsite internships for the Summer of 2023. These internships show VSCL student representation at a variety of companies and institutions across the United States. Students which have been selected for internships in the Summer of 2023 include:

VSCL Graduate Research Assistant and Ph.D Student Chris Leshikar has been selected for a Summer 2023 internship with the Gulfstream Aerospace Corporation this summer in Savannah, GA. Chris will be working in the Flight Dynamics group on system identification methods and analyses for jets going through the certification process.

 

 

 

 

 

VSCL Graduate Research Assistant and Ph.D Student Hannah Lehman has been selected for a Summer 2023 research internship at Sandia National Laboratory in Albuquerque, NM. Hannah has been working as a Year-Round Research & Development Intern since 2020, with a principal focus of applying machine learning to defense vehicles.

 

 

 

 

 

VSCL Graduate Research Assistant and MS student MD-Nazmus Sunbeam has been selected for a Summer 2023 internship with Starfish Space in Seattle, WA. Sunbeam will be working on computer vision / navigation DL algorithms for space vehicles.

 

 

 

 

 

 

VSCL Graduate Research Assistant and MS Student Cassie-Kay McQuinn has been selected for a Summer 2023 research internship at the Airforce Research Labatory at Wright-Patterson Air Force Base near Dayton, OH.

 

 

 

 

 

 

VSCL Graduate Research Assistant Jillian Bennett has been selected for a Summer 2023 research internship with VSCL. Jillian will be starting the adaptive time scale control project.

 

 

 

 

VSCL Undergraduate Research Assistant Seth Johnson has been selected for a Summer 2023 internship with VectorNav in Dallas, TX. Seth will be working as a Nevigation Engineer.

VSCL Undergraduate Research Assistant Yuki Janvier has been selected for a Summer 2023 internship with Atlassian in Austin, TX. Yuki will be working as a Software Engineering Intern.

VSCL Undergraduate Research Assistant Katelyn Lancaster has been selected for a Summer 2023 internship with Lockheed Martin in Marietta, GA. Katelyn will be doing Test and Evaluation engineering.

VSCL Undergraduate Research Assistant Carla Zaramella has been selected for a Summer 2023 internship with Raytheon in Tewsbury, MA. Carla will be working as a “Whole Life Program – Systems Engineering Intern” in RTX Missiles and Defense. She will be working with a team to ensure that hardware and systems are effective, reliable and maintainable, the goal of WLE.

VSCL Undergraduate Research Assistant Laura Escamilla has been selected for a Summer 2023 research internship with VSCL. Laura will be working with a Vector nav calibration for the anaconda, and will support the Robust Threat Detection project.

VSCL Undergraduate Research Assistant Abby Andrews has been selected for a Summer 2023 research internship with Impact Systems Engineering in Temple, TX. Abby will be working with 4200 and 5200 3D printers, with her role primarily focusing on de-powering parts and structuring builds units.

VSCL Undergraduate Research Assistant Payton Clem has been selected for a Summer 2023 research internship with VSCL. Payton will be working with systems architecture on the Robust Threat Detection project.