Department of Mechanical Engineering
The University of Texas at Austin
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
SPRING 2017 | 144L
FALL 2016 |144L | 383Q | 386M

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 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.
  • Gohean, J.R., E.R. Larson,  B.H. Hsi, M. Kurusz, M., R.W. Smalling, and R.G. Longoria, Scaling the low-shear pulsatile TORVAD for pediatric heart failure, ASAIO Journal (accepted Nov. 2016)
  • Gohean, J.R., M.J. George, K.W. Chang, E.R. Larson, T.D. Pate, M. Kurusz, R.G. Longoria, and R.W. Smalling,  Preservation Of Native Aortic Valve Flow And Full Hemodynamic Support With The TORVAD Using A Computational Model Of The Cardiovascular System, ASAIO Journal, Vol. 61, No. 3, pp. 259-265, May-Jun, 2015
  • Gohean, J.R., M.J. George, T.D. Pate, M. Kurusz, R.G. Longoria, and R.W. Smalling RW, Verification of a computational cardiovascular system model comparing the hemodynamics of a continuous flow to a synchronous valveless pulsatile flow left ventricular assist device, ASAIO Journal, Vol. 59,No. 2, pp. 107-116, March/April 2013
  • Letsou, G.V., Pate, T.D., Gohean, J.R., Kurusz, M., Longoria, R.G., Kaiser, L., Smalling, R.W., Improved left ventricular unloading and circulatory support with synchronized pulsatile left ventricular assistance compared with continuous-flow left ventricular assistance in an acute porcine left ventricular failure model, Journal Of Thoracic And Cardiovascular Surgery, Vol. 140, No. 5, pp. 1181-1188, 2010
  • 5 issued patents with UT-System as assignee

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.

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
  • Hearn, C.S., M. C. Lewis, S. B. Pratap, R. E. Hebner, F. M. Uriarte, D. Chen and R. G. Longoria, Utilization of Optimal Control Law to Size Grid-Level Flywheel Energy Storage, IEEE Transactions on Sustainable Energy, Vol. 4, no. 3, pp. 611-618, July 2013
  • 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

Vehicle System Dynamics, Controls, Mobility, and Power Systems
  • 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

  1. Soovadeep Bakshi, Modeling and control of transition dynamics in a two-piston toroidal blood pump (M.S., exp. May 2017)
  2. Etse-oghena Y Campbell, An evaluation and re-design of a vision-based feedback controls experiment for undergraduate dynamic systems laboratory (M.S., exp. Fall 2016)
  3. Joaquin Campos, Pulse forming networks for conditioning and storage of renewal energy sources (Ph.D., exp. May 2017)
  4. Da Fang, Modeling an inner-tire sensor and design of algorithms for estimating tire-surface contact metrics (M.S., exp. May 2017)
  5. Jeff Gohean (PhD, pre-qual; topic TBD)
  6. Ethan Rapp, Evaluation of Optimal Pulsatile LVAD Support using a Hybrid Mock Circulatory Loop (PhD, pre-qual.)
  7. Trevor Ricker (M.S., topic TBD; exp. Dec 2017)
  8. Sijie Yu, Developing a hydropneumatic pulse-forming network into a cyberphsical energy-storage system (M.S., exp. May 2017)
Supervision of part-time doctoral students
The following students are pursuing a doctoral degree on a part-time basis while employed outside of the University of Texas at Austin
  1. Albert Espinoza (currently teaching at Polytechnic Univ of Puerto Rico, Mechanical Engineering), topic TBD
  2. John Osborn (on leave from NASA-JSC, Houston), Vehicle handling qualities with application to spacecraft design (Ph.D., pre-qualified - biomechanics area)
Graduated students | See this page
This list of students will give an idea of the range of topics we have studied within my group.

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 February 3, 2017

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