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RESEARCH | CURRENT GROUP

Areas of current and past research work:
Modeling
Cardio/VAD | Vehicles | Power systems
TEACHING & COURSES
UT CANVAS | UT DIRECT
Fall 2017 | 144L | 383Q | 386M
SUMMER 2017 | w344
SPRING 2017 | 144L


NOTICES:
  • Congratulations to Joaquin Campos who successfully defended his doctoral dissertation on August 9, 2017!
  • Interest in RA or research: currently not recruiting for any funded positions but willing to discuss interests after Fall term begins (Send current resume after September 1)

RAUL G. LONGORIA, PHD, PE
Professor
Department of Mechanical Engineering
The University of Texas at Austin

pref
My ME Department page
R.G. Longoria CV
E-mail: r.longoria@mail.utexas.edu

Mailing Address:
The University of Texas at Austin
Department of Mechanical Engineering
204 E. Dean Keeton Street; Stop C2200
Austin, Texas 78712-1591

Shipping Services Address:
The University of Texas at Austin
Department of Mechanical Engineering
204 E. Dean Keeton, Rm. 1.210A
Austin, TX 78712


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RESEARCH AREAS AND SELECTED PUBLICATIONS
My core expertise lies in physical system modeling, simulation and control, and my research interest is in advancing principles and methods in these areas and in their application to solve practical problems.  I have active projects in:
  • modeling, design, and development of a human-implantable, mechanical circulatory support  device (i.e., a left-ventricular assist device or LVAD),
  • cyber-physical system modeling and assertion-driven debugging, and
  • sensing and actuation in ground vehicle systems

Cardiovascular System Modeling and Mechanical Circulatory Support
We are developing a new class of pulsatile left-ventricular assist device (LVAD) for human implantation. This work is a c
ollaboration with a UT startup based in Austin, TX,  Windmill Cardiovascular Systems, Inc, and with Dr. Richard Smalling, UTHealth (Houston) and is sponsored through WCS via funding from NIH-NLBHI and private investment.
Supervised dissertations/theses:
  • Thomas D. Pate, Design and Development of a Circular Left-Ventricular Assist Device, August 2005

CPS Synergy: Physically-Informed Assertions for CPS Development and Debugging
This is a collaboration with Christine Julien and Sarfraz Khursid (UT-ECE) and Miryung Kim (UCLA-ECE).  Project sponsored by National Science Foundation.

Supervised theses:
  • Sijie Yu, A Cyber-Physical System Implementation for a Hydro-Pneumatic Pulse Forming Network (MS), May 2017
  • Dongyi Kim, Model Based Assertions and Robust Control for Cyber-Physical Systems Autonomous Intersection Management System (MS), May 2016
  • Garrett Idler, Model-Based Assertions: A System Design Tool for Cyber-Physical Systems (MS), May 2015

Multidisciplinary System Dynamics, Modeling and Simulation
  • Hearn, C.S., S.B. Pratap, D. Chen, and R.G. Longoria, Dynamic Performance of Lumped Parameter Model for Superconducting Levitation, IEEE Transactions on Applied Superconductivity, Vol 24, no. 2, September 2016
  • Hearn, C.S., S.B. Pratap, D. Chen, and R.G. Longoria, Lumped Parameter Model to Describe Dynamic Translational Interaction for High Temperature Superconducting Bearings, IEEE Transactions on Applied Superconductivity, Vol 26, no. 2, April 2014
  • Hearn, C.S., S.B. Pratap, D. Chen, and R.G. Longoria, Reduced Order Dynamic Model of Permanent Magnet and HTSC Interaction in an Axisymmetric Frame, IEEE Transactions on Mechatronics, Vol. 19, no. 4, pp. 1226-1233, August 2014
  • Connolly, T.J.M., Longoria, R.G., An Approach for Actuation Specification and Synthesis of Dynamic Systems, Journal Of Dynamic Systems, Measurement, And Control, Vol. 131, No. 3, 2009
  • Campos, J., Crawford, M., Longoria, R.G., Rotordynamic Modeling Using Bond Graphs: Modeling the Jeffcott Rotor,'' IEEE Transactions On Magnetics, Vol. 41, 2005, No. 1, pp. 274--280
  • Kypuros, J.A., and R.G. Longoria, Model Synthesis for Design of Switched Systems Using Variable Structure Theory, ASME Journal Of Dynamics Systems, Measurement, And Control, Vol. 125, No. 4, pp. 618-629, 2003
  • Compere, M.D. and R.G. Longoria, Combined DAE and Sliding Mode Control Methods for Simulation of Constrained Mechanical Systems, ASME Journal Of Dynamics Systems, Measurement, And Control, Vol. 122, No. 4, pp. 691-698, December 2000
Selected supervised dissertations/theses:
  • Clay Hearn, Design methodologies for advanced flywheel energy storage  (Ph.D., co-advised with Dongmei Chen), August 2013 
  • Chayawee Wangcharoenrung, Development of Adaptive Transducer Based on Biological Sensory Mechanism (PhD), May 2005
  • Fu Zhang, Simulation of dynamic systems with uncertain parameters (PhD), August 2004
  • Seyoon Kim, A Bond Graph Approach to Analysis, Synthesis, and Design of Dynamic Systems (PhD), December 2003
  • Marc Compere, Simulation of Engineering Systems Described by High-Index DAE and Discontinuous ODE Using Single Step Methods (PhD), August 2001
  • Hanzhong Zhang, A Moving Boundary Problem in a Distributed-Parameter System with Application to Diode Modeling (PhD, with Prof. M. Driga, UT ECE), August 2001
  • Javier A. Kypuros, Variable structure model synthesis for switched systems (PhD), May 2001
  • Thomas J. Connolly, Synthesis of Multiple Energy Active Elements for Mechanical Systems (PhD), May 2000
  • Nick Kiritsis, Modeling of Microdialysis Processes and Systems used for In Vitro Experiments (PhD), August 1999

Vehicle System Dynamics, Controls, and Mobility
  • LeSage, J.R., and R.G. Longoria, Mobile system shutdown prevention via energy storage-aware predictive control, American Control Conference (ACC), 2016, July 6-8, 2016, Boston, MA.
  • LeSage, J.R. and R.G. Longoria, Mission Feasibility Assessment for Mobile Robotic Systems Operating in Stochastic Environments, Journal of Dynamic Systems, Measurement and Control, Special Issue on Stochastic Models, Control and Algorithms in Robotics, Vol. 137, no.3, October 2014
  • LeSage, J.R. and R.G. Longoria, Characterization of Load Uncertainty in Unstructured Terrains and Applications to Battery Remaining Run-time Prediction, Journal of Field Robotics, Vol. 30, No. 3, pp. 472–487, May/June 2013
  • Solis, J.M., Longoria, R.G., Modeling Track-Terrain Interaction for Transient Robotic Vehicle Maneuvers,  Journal Of Terramechanics, Vol. 45, 2008, No. 3, pp. 65-78
  • Wang, J., Longoria, R.G., Coordinated and Reconfigurable Vehicle Dynamics Control, IEEE Transactions On Control System Technology, Vol.17, 2008, No. 3, pp. 723-732
  • Wang, J., Longoria, R.G., Effect of Computational Delay on the Performance of a Hybrid Adaptive Cruise Control System, 2006-01-0800, SAE Journal Of Passenger Cars - Electronic & Electrical Systems, Vol. 115, pp. 307-316, 2006
Supervised dissertations/theses:


Power Systems / Electric Ship Power Reconfiguration
Supervised dissertations/theses:

CURRENT GRADUATE STUDENTS
  1. Albert Espinoza* Stochastic Vehicle-Terrain Identification for Robotic Vehicle Control (PhD); currently teaching at Polytechnic Univ of Puerto Rico, Mechanical Engineering (pre-qual)
  2. Da Fang, Modeling an inner-tire sensor and design of algorithms for estimating tire-surface contact metrics (MS), exp. Fall 2017
  3. Jeff Gohean* Cardiovascular system modeling and LVAD control - tentative topic title (PhD), pre-qual
  4. John Osborn Requirements for Satisfactory Handling Qualities of Manned Spacecraft (PhD); on leave from NASA-JSC, Houston (PhD candidate - biomechanics area)
  5. Suraj Pawar Methods for Design of Hardware-in-the-Loop Simulation for Cyber-Physical System Applications (MS), exp. Spring 2019
  6. Ethan Rapp, Evaluation of Optimal Pulsatile LVAD Support using a Hybrid Mock Circulatory Loop (PhD), pre-qual
*Indicates a part-time student
Full list of graduated students | See this page
This list of students will give an idea of the range of topics we have studied within my group.



TEACHING / CURRENT AND PAST COURSES | UT Canvas
I teach courses in dynamic system modeling, bond graph methods, simulation, controls, and experimentation, and an applied course in vehicle system dynamics and controls.  In past years I have taught courses in mechatronics, fluid mechanics, and vibrations.

Last updated October 2017