Parks Faculty

Sanjay Jayaram, Ph.D.,<br/>Associate Professor

Sanjay Jayaram, Ph.D.,
Associate Professor

Associate Professor

Phone:
(314) 977-8212
Education:

Ph.D. Mechanical Engineering

University of Central Florida

M.S. Mechanical Engineering

University of Central Florida

B.S. Mechanical Engineering

R.V. College of Engineering, Bangalore, India

Sanjay Jayaram joined Saint Louis University in 2005 as an Assistant Professor in the Department of Aerospace & Mechanical Engineering at Parks and became Coordinator of Aerospace Engineering in August 2013. He received his B.S. degree in Mechanical Engineering from Rashtreeya Vidyalaya College of Engineering, India in 2004 and subsequently he received his M.S and Ph.D. degree in Mechanical Engineering from University of Central Florida in 1998 and 2004 respectively. He worked as Research Associate at Florida Space Institute for one year from 1998 to 1999.  He has peer reviewed journal and conference publications in many sources with a focus on advanced control systems design and spacecraft engineering. Jayaram heads/mentors several student-design spacecraft at Saint Louis University.

He is a member to many professional societies, including AIAA, and the American Society for Engineering Education. He is currently serving as Treasurer for the Aerospace Division of ASEE and also as Committee Chair for AIAA/ASEE Leland Atwood Awards Committee.

Research Interests

Dr. Jayaram’s research interests include space systems robust fault tolerant control, nonlinear control, adaptive control, small spacecraft design, high performance spacecraft components, mechatronics, real-time health monitoring and diagnostic methodology, dynamic systems and control and space systems.

Actuator and Sensor Fault Tolerant Control System (FTCS)

A fault-tolerant control system is designed to retain some portion of its control integrity in the event of occurrence of a component or subsystem fault. Fault-tolerant control involves automatically detecting and identifying the failed components and then reconfiguring the control law on-line in response to these decisions. A fault-tolerant control system must have the ability to adjust off-nominal behavior, which occurs during sensor, actuator, or other component faults. The fault-tolerant control system consists of three primary parts: a controller, a fault diagnosis scheme, and a control law reconfiguration mechanism. Key challenges that are addressed in this research are:

  • Develop non-linear mathematical model to depict the behavior of the actual system
  • Develop Lyapunov Direct method based robust measures for actuator fault detection
  • A fault tolerant robust controller which is reconfigurable to redundant back-ups, 
  • A fault-tolerant controller that can engage suitably to either fixed or varied structure to perform its fault-tolerant functions.

Similar theory is developed for sensor fault tolerant framework using a Bank of Extended Kalman Filters.

Nano and Pico Spacecraft Design and Development (Space Systems Research Laboratory)

 The vision of the Space Systems Research Laboratory is to develop and maintain a Space Systems Lab that gives students of many disciplines and levels access to space. The mission of this laboratory is to design, fabricate, test, and operate micro-, nano- and pico-satellites, i.e., satellites in the 50 to 1 kg range, using a broad base of students from aerospace and mechanical engineering, electrical and computer engineering, computer science, and other disciplines. The laboratory supports both research and education. The education mission is to develop interdisciplinary mindset designing simple satellites that give undergraduates and graduate students quick access to space, and a challenging space based educational environment; an example of this is the CubeSat program.

Facilities

The Space Systems Research Lab (SSRL) is equipped to pursue research opportunities in the areas of Autonomous Unmanned Vehicles for Space Systems and Planetary Vehicles as well as Mechatronics/Robotics. Research activities in Advanced Control Systems will also be pursued.

Integration & Testing: The lab has a class 10000 clean facility with a soft-wall clean room (7 ft. x 7 ft. by 9 ft. height) for satellite integration. The laboratory has recently added a small thermal vacuum chamber and a vibration table for environmental analysis and acceptance testing of small spacecraft and components.  A larger vacuum chamber is used for experimental research in spacecraft thrusters and sensors.

Analysis & Training:  Modern design and analysis software is used for developing and evaluating new space systems.  In addition to standard aerospace tools (CAD, simulation, orbit analysis packages), SSRL has hardware testbeds, including the self-contained EyasSat teaching satellite.

Satellite Control Station: SSRL has three spacecraft tracking and command systems:  an omnidirectional beacon receiving station, a medium-gain OSCAR UHF/VHF Earth station, and a high-gain 3-meter S-Band station.  The OSCAR station is located atop Oliver Hall, whereas the other two stations are on the roof of McDonnell-Douglas Hall.  These elements are controlled from a central mission operations control room, and are used to control SLU developed space systems.  In addition, SSRL is part of an national satellite control network led by Santa Clara University, and thus SSRL participates in a wider range of University and NASA missions.

Applied FTCS: Autonomous Rendezvous and Docking of Spacecrafts

In this applied FTCS work, the concepts include proximity operations between spacecraft by developing improved relative motion models necessary for spacecraft services such as inspection, interception, rendezvous, and docking. The focus of the research is to detect faulty actuators and sensors which are primarily used to perform precise close proximity maneuvers for rendezvous and docking technologies

Advanced Controls and Mechatronics

This collaborative interdisciplinary research integrates, at a fundamental level, system design, modeling, and control disciplines to obtain improved performance of the dynamic response of engineering systems using feedback. Research topics includes systems integration, dynamic system modeling, feedback control design, and the fundamentals of systems theory as applied to linear and nonlinear dynamic systems, mechatronics, structural control, aerospace, and mechanical engineering disciplines. Systems under this research involves:

  • Unmanned Ground Vehicles
  • Unmanned Air Vehicles
  • Unmanned Underwater Vehicles
  • Spacecraft and Space Systems

Below is a list of Sanjay Jayaram’s selected publications. For more information on each publication, please visit the Parks College Publication Database.

Printed Archival Peer-Reviewed Journals
  • S. Jayaram, “Fault Tolerant Autonomous Rendezvous and Docking Architecture for Spacecraft in Presence of Control Actuator Failures”, International Journal of Intelligent Unmanned Systems, Volume 1, Issue 1, pp. 5-20, 2013. DOI: 10.1108/20496421311298116 
  • S. Jayaram, “Sensors for Mechatronics”, Book Review, In Press, To Appear in Sensors Review, Volume 33, Issue 1, 2013. (DOI – not yet provided)
  • S. Jayaram, D. Pais, “Model-based Simulation of Passive Attitude Control of SLUCUBE-2 Using Nonlinear Hysteresis and Geomagnetic Models”, In Press, To appear in International Journal of Aerospace Sciences, Vol.1, No.4, pp. 77-84, 2012. doi: 10.5923/j.aerospace.20120104.04
  • S. Jayaram, M. McQuilling, “PRO/MECHANICA-based Structural and Random Vibration Analysis of Picosatellite Structure”, International Journal of Computer Aided Engineering and Technology, Vol. 4, No.1, pp. 90 - 100, 2012. doi: 10.1504/IJCAET.2012.044585
  • S. Jayaram, E. Gonzalez, “Design and Construction of a Low-Cost Economical Thermal Vacuum Chamber for Spacecraft Environmental Testing”, Journal of Engineering, Design and Technology Volume 9, Issue 1, pp. 47 – 62, 2011. doi: 10.1108/17260531111121468
  • S. Jayaram, R. Johnson, “Robust Fault Tolerant Control Architecture – Actuator Fault Detection and Reconfiguration”, Journal of Control and Intelligent Systems Volume 38, Issue 1, pp. 1 – 8, 2010. doi: 10.2316/Journal.201.2010.1.201-2033
  • S. Jayaram, L. Boyer, J. George, K. Ravindra, K. Mitchell, “Project-Based Introduction to Aerospace Engineering Course: A Model Rocket”, Acta Astronautica,  Volume 66, Issue 9 – 10, pp. 1525 – 1533, 2010. doi: 10.1016/j.actaastro.2009.10.038
  • S. Jayaram, “A New Fast Converging Kalman Filter for Sensor Fault Detection and Isolation”, Sensor Review, Volume 30, Issue 3, pp. 210 – 224, 2010. DOI: 10.1108/02602281011051407
  • S. Jayaram, “Design of Template to Fabricate Magnetic Torquer Coils for Nano and Picosatellite Missions”, Journal of Engineering, Design and Technology, Volume 8, No. 2, pp. 158 – 167, 2010. doi: 10.1108/17260531011062537
  • S. Jayaram, “Model-based Actuator Fault Tolerant Robust Control Architecture: An Unmanned Aerial Vehicle Example”, International Review of Aerospace Engineering, Volume 2, No. 4, pp. 192-198, 2009.
  • S. Jayaram, “Design and Analysis of Nano Momentum Wheel for Picosatellite Attitude Control System”, International Journal of Aircraft Engineering and Aerospace Technologies, Volume 81, Issue 5, pp. 424-431, 2009. doi: 10.1108/00022660910983707
  • S. Jayaram, “Development of Payload Housing for Temperature and Pressure Control of Bio fuel Cells for Space Applications”, Journal of Engineering, Design and Technology, Volume 7, Issue 3, pp. 323-334, 2009. doi: 10.1108/17260530910998712
  • S. Jayaram, “SLUCUBE: Innovative high performance nanosatellite science and technology demonstration mission”, Acta Astronautica, Volume 65, Issue 11-12, pp 1804-1812, 2009. doi: http://dx.doi.org/10.1016/j.actaastro.2009.04.001
  • S. Jayaram, “Spacecraft Engineering Education and Research Overview at Saint Louis University”, IEEE Aerospace and Electronics Systems Magazine, Volume 24, Issue 10, pp 12-16, 2009. doi: 10.1109/MAES.2009.5317779
  • R. Johnson, S. Jayaram, “A New Real-Time Automated Ground Health Monitoring At A Satellite Ground Control Station”, International Journal of Control and Intelligent Systems, Vol. 32, No. 1, pp. 27-34, January 2004. doi: 10.2316/Journal.201.2004.1.201-1132
Peer-Reviewed Conference Papers
  • Jayaram, S., Swartwout, M. A., (2013). “An Introductory Course in Practical Systems Engineering”. 120th ASEE Annual Conference, Atlanta, GA, 25 June 2013. Paper 6816.
  • S. Jayaram, “Implementation of Active Cooperative Learning and Problem-based Learning in an Undergraduate Control Systems Course”, 2013 ASEE Annual Conference.
  • J. Christian, S. Jayaram,  M. Swartwout, “Feasibility of a Deployable Boom aboard Picosatellites for Instrumentation and Control Purposes”, IEEE Aerospace Conference, 2012.
  • M. Swartwout, S. Jayaram, R. Reed, R. Weller, “Argus: A flight campaign for modeling the effects of space radiation on modern electronics”, IEEE Aerospace Conference, 2012.
  • M. Swartwout, S. Jayaram, “The Argus Mission:  Detecting Thruster Plumes for Space Situational Awareness”, IEEE Aerospace Conference, 2011.
  • S. Jayaram, M. Swartwout, “A Review of the Role of Student-Built Spacecraft in Workforce Training and Innovation: Ten Years of Significant Change”, AIAA 2010-8735, AIAA Space 2010 Conference and Exhibit.
  • S. Jayaram, P. Knudtson, D. Zidar, N. Freed, “Perseus Launch Vehicle: Student Designed Aerospace Engineering Senior Capstone Project”, 2009 ASEE Conference and Exhibit, Austin TX.
  • S. Jayaram, D. Rooney, C. Shotridge, M. Roseman, J. Aschenbrenner, “PASSat: A Cubesat Student Design Project for Active Control System Development and Verification”, 2009 ASEE Conference and Exhibit, Austin TX.
  • B. Corrado, W. Ebel, S. Jayaram, “Cubesat Software Defined Radio Project”, 26th International Communications Satellite Systems Conference (ICSSC), AIAA, 10 - 12 June 2008, San Diego, CA.
  • S. Condoor, S. Jayaram, L. Boyer, “Learning Statics: A Foundational Approach”, 2008 ASEE Conference and Exposition, Pittsburgh, USA.
  • S. Condoor, L. Boyer, S. Jayaram, “The Art of Design Modeling – Teaching Freshmen Engineering Graphics Course”, 2008 ASEE Conference and Exposition, Pittsburgh, USA.
  • S. Jayaram, Darren Pais, Sonia Hernandez, Paul Lemon, Nathaniel Clark, Benjamin Corrado, Brian Vitale, Justin Kerber, Elena Nogales, Jorge Moya, Robert Arechaderra, “BillikenSat-II: The First Bio-Fuel Cell Test Platform for Space, SSC07-XI-3, USU/AIAA Small Satellite Conference, Logan, Utah, 2007.
  • S. Jayaram, “BillikenSat 1: First CubeSat Design at Saint Louis University, 2006 ASEE Conference, Aerospace Division.
  • S. Jayaram, Dr. Roger Johnson, Richard Hull, “A New Real-Time Detection/Diagnosis Methodology for Automated Manufacturing”, Sixth International Conference on Robotics and Manufacturing sponsored by The International Association of Science and Technology for Development – IASTED July 26-29 1998, pp. 161-164.
  • S. Jayaram, Dr. Roger Johnson, “Applications of Extended Kalman Filter at a Satellite Ground Control Station”, Second IASTED International Conference on Control and Applications, July 25-29 1999, pp. 124-127.
  • S. Jayaram, Chrishma Singh Derewa, Derek Shannon, “The Florida Space Institute’s PHOTON Satellite Bus”, Selected for 13th Annual AIAA/Utah State University Conference on Small Satellite - Student Competition to be held from August 23-26 1999. This paper will be published in the AIAA/USU Small Satellite Proceedings. Secured 3rd place in the Student Competition.
  • S. Jayaram, R. Johnson, S. Lei, “Distributed Processing Kalman Filter for Automated Vehicle Parameter Estimation – A Case Study”, IASTED – ASM2000, Jul 24-26, 2000, Banff, Canada, pp. 270-276.
  • S. Jayaram, R. Johnson, S. Lei, C. Ham, “Real-time Attitude and Orbit Control of a Small LEO Satellite with Parallel-Processing Approach in a Ground Station”, 14th Annual AIAA/USU Conference on Small Satellites, 2000, Logan, Utah.
  • S. Jayaram, Roger W. Johnson, Zhi Hua Qu, Yufang Jin, “Autonomous Navigation Vehicle Health Monitoring and Control System Based on Real-Time Model-Based Simulation”, IASTED - Intelligent Systems and Control Conference, Florida, pp. 152 - 157, 2001.
  • S. Jayaram, Roger W. Johnson, Zhi Hua Qu, Yufang Jin, “Autonomous Satellite Health Monitoring And Control System: Redundancy And Fault Tolerance”, International Conference on Nonlinear Problems in Aviation and Aerospace (ICNPAA), Melbourne, Florida 2002.
  • Roger W. Johnson, S. Jayaram, Bhargav Gajjar, Jami Ward, “Flexible Structure Monitoring and Fault Tolerant Control System: Actuator Fault Detection and Reconfiguration”, IASTED – Intelligent Systems and Control Conference, Salzburgh, Austria, pp. 455-459, June 25-27, 2003.
  • S. Jayaram, P. Gupta, G. Prasad, Jami Ward,  “SimBox: a simulation-based scalable architecture for distributed command and control of spaceport and service constellations”, Enabling Technologies for Simulation Science VIII, SPIE Defense and Security Symposium, Orlando, FL., April 13 – 15, 2004.
  • Roger W. Johnson, S. Jayaram, Dan Hand, Jami Ward, “An Approach to Automated Control and Health Monitoring for Small Satellites”, The 18th Annual AIAA/USU Conference on Small Satellites, Aug. 9-12, 2004, Logan Utah.
Conference Posters
  • Jayaram, S., Swartwout, M., Ravindra, K. Hands-on, CubeSat-Oriented Space Systems Engineering Education at Saint Louis University. Presented at 39th COSPAR Scientific Assembly, July 2012, India.