Bryce Roth, Ph.D.
Aerospace Systems Design Laboratory
School of Aerospace Engineering
Georgia Institute of Technology

Title: Research Engineer II
Status: Professional Research Staff, ASDL
Office: Rm 322, Weber Bldg.

Phone: (404)894-7779
Fax: (404)894-6596
e-mail: bryce.roth@ae.gatech.edu

Primary
Responsibilities:

Management of GEAE University Strategic Alliance Program in Probabilistic and Robust Engine Design Methods
Technical lead for propulsion systems research at ASDL
Development and application of advanced vehicle design methods
Research proposal preparation

Research Interests and Areas of Expertise:

Advanced vehicle and engine design Methods, including:
1) Work potential methods for engine and aircraft design
2) Engine technology evaluation methods
3) Probabilistic engine design methods
System design and analysis Projects including:
1) Engine design, especially variable cycle gas turbine types
2) Aircraft design and analysis
3) Engine/airframe integration
4) Hypersonic vehicle design
5) Missile systems design

Summary of Research Experience: Dr. Roth has been involved with research in propulsion systems design and fixed-wing aircraft design since 1995. He has expertise in aerodynamics, aerothermodynamics, propulsion system cycle design, engine/airframe integration and installation analysis, mission analysis, vehicle design, and vehicle sizing/synthesis. His doctoral topic was development of methods for vehicle analysis based on the concept of thermodynamic work potential allowable within the bounds of the second law of thermodynamics. As part of this thesis research, Dr. Roth devised and demonstrated a completely new approach to vehicle mission analysis and weight control. This method relates usage of thermodynamic work potential during the vehicle mission to vehicle fuel weight and life cycle cost, resulting in what is effectively the first unified performance/weight/cost theory of modern vehicle design. He has published extensively on this subject and is a recognized leader in the field.

In his current job as a Research Engineer, Dr. Roth is directing various propulsion-related research projects. His primary responsibility is management of three contracts: 1) GE Aircraft Engines University Strategic Alliance (USA) in Probabilistic and Robust Design, 2) management of a NASA Glenn contract to develop NPSS-based tools for analysis of revolutionary aeropropulsion concepts, and 3) management of a NASA Glenn research grant investigating the systems potential of thermoacoustic propulsors. Dr. Roth is also responsible for the preparation of various research proposals and participates in the development of new business contracts for the Aerospace Systems Design Laboratory.

In addition, Dr. Roth has been involved in a variety of related research projects within the past eight years. The most notable of these projects include: 1) development of NPSS-based variable cycle engine models for supersonic business jet applications, 2) development of advanced propulsion system technology evaluation/selection methods, 3) propulsion system design for high-speed standoff missiles, 4) probabilistic design methods for commercial aircraft engines, and 5) probabilistic approaches to engine/airframe matching. He has also worked closely with GE Aircraft Engines since 1995 on a variety of research projects pertaining to the above-mentioned research initiatives. Finally, Dr. Roth served as the 1996 High Speed Civil Transport (HSCT) design team leader and was also responsible for HSCT propulsion system design and simulation.

Education:

B.S. Aerospace Engineering, Georgia Institute of Technology, 1995

M.S. Aerospace Engineering, Georgia Tech, 1997

Ph.D. Aerospace Engineering, Georgia Tech, 2000

Ph.D. Qualifying Areas: 1) high temperature gas dynamics, 2) structural analysis, 3) vehicle design.
Out-of-Qualifier Area: robust/optimal controls.

Professional Societies: American Institute of Aeronautics and Astronautics, Society of Allied Weight Engineers, Association of Old Crows

List of Published Articles, Books, Monographs, and Reports - Roth

Doctoral Dissertation:

Roth, B.A., A Theoretical Treatment of Technical Risk in Modern Propulsion System Design, Ph.D. Thesis, Georgia Institute of Technology, Atlanta, GA, March 30, 2002.

Journal Publications:

Roth, B.A., Graham, M., Mavris, D., "Adaptive Selection of Aircraft Engine Technologies in the Presence of Risk," J. of Engineering for Gas Turbines and Power, Vol. 126, No. 1, Jan. 2004.
Roth, B.A., Mavris, D.N., "A Method for Propulsion Technology Impact Via Thermodynamic Work Potential," J. of Aircraft, Vol. 40, No. 1, Jan-Feb 2003.
Roth, B.A., "Aerodynamic Drag Loss Chargeability and Its Implications in the Vehicle Design Process," J.of Aircraft, Vol. 40, No. 1, Jan-Feb 2003.
Roth, B.A., "A Work Potential Perspective of Engine Component Performance," J. of Propulsion and Power, Vol. 18, No. 6, pp. 1183-1190, Nov-Dec 2002.
Roth, B.A., Mavris, D.N., "A Comparison of Thermodynamic Loss Models Suitable for Gas Turbine Propulsion," J. of Propulsion and Power, Vol. 17, No. 2, pp. 324-332, Mar-Apr 2001.
Roth, B.A., Mavris, D.N., "Technology Evaluation via Loss Management Models Formulated in Terms of Vehicle Weight," Weight Engineering, Vol. 60, No. 1, pp. 53-77 (see also SAWE3001), Fall 2000.

Pending Journal Publications:

Roth, B., Patel, C., "Application of Genetic Algorithms in the Engine Technology Selection Process," J. of Engineering for Gas Turbines and Power, GT-2003-38482.

Conference Publications:

Roth, B.A., "The Role of Thermodynamic Work Potential in Aerospace Vehicle Design," Cleveland, 16th ISABE, Sept. 2003.

Roth, B., Patel, C., "Application of Genetic Algorithms in the Engine Technology Selection Process," ASME Turbo Expo, Atlanta, June 16-19 2003, GT-2003-38482.

Roth, B.A., Mavris, D.N., Macsotai, N.I., "Adaptive Selection of Pareto-Optimal Engine Technology Solution Sets," 23rd Congress of the International Aeronautical Sciences, Toronto, 8-13 Sept. 2002, ICAS2002-5.9.4.

Roth, B.A., Ender, T., Mavris, D.N., "Technology Portfolio Assessments Using a Modified Genetic Algorithm Approach," AIAA Multidisciplinary Analysis Conference, Atlanta, 3-5 Sept. 2002, AIAA2002-5424.

Roth, B.A., McDonald, R.M., Mavris, D.N., "A Method for Thermodynamic Work Potential Analysis of Aircraft Engines," Joint Propulsion Conference, Indianapolis, IN, 7-10 July 2002, AIAA2002-3768.

Roth, B.A., Graham, M., Mavris, D., "Adaptive Selection of Aircraft Engine Technologies in the Presence of Risk," ASME Turbo Expo, Amsterdam, 3-6 June 2002, GT-2002-30623.

Riggins, D., Wilson, C., Roth, B., McDonald, R., "Performance Characterization of Turboshaft Engines Via Availability and Second Law Analysis," 58th American Helicopter Society Forum, Montreal, Canada, 4-6 June 2002.

Roth, B.A., Mavris, D.N., "A Stochastic Approach to Designing Affordable, Environmentally Acceptable Systems," Presented at the 2002 NSF DMII Grantee's Conference, San Juan, January 2002.

Roth, B.A., “Aerodynamic Drag Loss Chargeability and Its Implications in the Vehicle Design Process,” 2001 Aviation Week/AIAA Technology & Operations Conference, Los Angeles, Oct. 2001, AIAA2001-5236.

Roth, B.A., German, B.J., Mavris, D.N., "Commercial Engine Architecture Selection in the Presence of Uncertainty and Evolving Requirements," 14^th ISABE, Bangalore, India, Sept. 2001, ISABE2001-1169.

Roth, B.A., Mavris, D.N., "A Method for Comprehensive Evaluation of Propulsion System Thermodynamic Performance and Loss," 2001 AIAA/ASME/SAE Joint Propulsion Conference, Salt Lake City, UT, 8-11July, 2001, AIAA2001-3301.

Roth, B.A., "A Work Potential Perspective of Engine Component Performance," 2001 AIAA/ASME/SAE Joint Propulsion Conference, Salt Lake City, UT, 8-11July, 2001, AIAA2001-3300.

Roth, B.A., German, B.J., Macsotai, N.I., Mavris, D.N., "Adaptive Selection of Engine Technology Solution Sets from a Large Combinatorial Space," 2001 AIAA/ASME/SAE Joint Propulsion Conference, Salt Lake City, UT, 8-11July, 2001, AIAA2001-3208.

Roth, B.A., Mavris, D.N., "Minimizing Vehicle Environmental and Economic Cost Via Thermodynamic Work Potential," 2001 NSF DMII Grantees Conference, Tampa, FL, Jan. 2001.

Roth, B.A., Mavris, D.N., "A Work Availability Perspective of Turbofan Engine Performance," AIAA Aerospace Sciences Meeting, Reno, NV, Jan 2001, AIAA2001-0391.

Roth, B.A., Mavris, D.N., "Evaluation and Selection of Technology Concepts for a Hypersonic High Speed Standoff Missile," AIAA Missile Sciences Conference, Monterey, CA, Nov. 2000.

Roth, B.A., Mavris, D.N., "A Generalized Model for Vehicle Thermodynamic Loss Management and Technology Concept Evaluation," World Aviation Congress and Exposition, San Diego, CA, Oct. 2000, SAE2000-01-5562.

Roth, B.A., Mavris, D.N., "A Method for Propulsion Technology Impact Evaluation Via Thermodynamic Work Potential," 8^th Multidisciplinary Analysis and Optimization Conference, Long Beach, CA, Sept. 2000, AIAA2000-4854.

Roth, B.A., Mavris, D.N., "A Comparison of Thermodynamic Loss Models Suitable for Gas Turbine Propulsion: Theory and Taxonomy," 36^th Joint Propulsion Conference and Exhibit, Huntsville, AL, July 2000, AIAA2000-3714.

Roth, B.A., Mavris, D.N., "A Comparison of Thermodynamic Loss Models Applied to the J-79 Turbojet Engine," 36^th Joint Propulsion Conference and Exhibit, Huntsville, AL, July 2000, AIAA2000-3715.

Roth, B.A., Mavris, D.N., "Technology Evaluation via Loss Management Models Formulated in Terms of Vehicle Weight," 59^th International Conference of the Society of Allied Weight Engineers, St. Louis, June, 2000, SAWE Paper No. 3001.

Roth, B., Mavris, D., "Formulation of Available Energy-Based Methods to Assess System Affordability," Presented at the 2000 NSF Grantees Conference, Vancouver, Jan. 2000.

Mavris, D.N., Roth, B.A., and Macsotai, N.I., "A Method for Probabilistic Sensitivity Analysis of Commercial Aircraft Engines," 14th ISABE, Florence, Italy, Sept. 1999.

Roth, B., and Mavris, D., "Analysis of Advanced Technology Impact on HSCT Engine Cycle Performance," 35th Joint Propulsion Conference, Los Angeles, June 1999, AIAA 99-2379.

Roth, B., Mavris, D., "A Stochastic Approach to Designing Affordable, Environmentally Acceptable Systems," 1999 NSF Grantees Conference, Long Beach, CA, Jan. 1999.

Mavris, D.N., Macsotai, N.I., Roth, B.A., "A Probabilistic Design Methodology for Commercial Aircraft Engine Cycle Selection," 1998 World Aviation Congress and Exposition, Anaheim, CA, September 28-30, 1998. SAE-985510.

Roth, B., Mavris, D., and Elliott, D., "A Probabilistic Approach to UCAV Engine Sizing," 34th Joint Propulsion Conference, July 13-15, 1998, Cleveland, OH, AIAA98-3264.

Mavris, D.N., Roth, B., "A Methodology for Robust Design of Impingement cooled HSCT Combustion Liners," 35th Aerospace Sciences Meeting and Exhibit, Reno, NV, January 6-9, 1997. AIAA-97-0288.

Pending Conference Publications:

Roth, B.A., "A Work Transfer Perspective of Propulsion System Performance," submitted to 2004 AIAA/ASME/ASEE/SAE Joint Propulsion Conference, Ft. Lauderdale, FL, July 2004.

Other Published Works:

Roth, B.A., "Drawbacks of the Delta Wing for Supersonic Transport Configurations, or Why the Supersonic Delta is a Dog," White Paper, Georgia Institute of Technology, November, 2003.
Roth, Danner, McClure, and Mavris, Revolutionary/Unconventional Aeropropulsion Technology Evaluation Through Thermodynamic Work Potential, Phase I Final Report to NASA Glenn, 5 March 2003.
Roth, B.A.," A Day in the Life of a Warbird," Article in Autopilot Magazine, July 2002, PP. 19.
Roth, B.A., McDonald, R., Mavris, D., Working Tables and Charts for Estimation of Thermodynamic Work Potential in Equilibrium Mixtures of Jet-A and Air, Final Report for NASA Contract NAG3-2586, June 2002.
Roth, B.A., "The Role of Thermodynamic Work Potential in Aerospace Vehicle Design," White Paper, Georgia Institute of Technology, June 2000.
Roth et al, "DKM119 Fast Attack, Air Launched Air to Ground Missile," Proposal for the 1999 AIAA Graduate Missile Design Competition, Georgia Institute of Technology, Atlanta, GA, June 1999.
Tai, J., Roth, B., Mavris, D., Schrage, D., NASA HSR Phase IIA Metrics Study, Final Report, NASA Glenn Research Center, March, 1999.
Mavris, D.N., Macsotai, N.I., Roth, B.A., "Probability Methods in Engine Design," Article in Aerospace Engineering Magazine, Vol. 19, No. 6, June 1998, PP30-33.
Roth et al, HSCT Design Team Final Report, Georgia Institute of Technology, Atlanta, GA, December 1996.
Roth et al, "An HSCT High Performance Low Bypass Mixed Flow Turbofan," Design Proposal for the 1995 AIAA Undergraduate Engine Design Competition, Georgia Institute of Technology, Atlanta, GA, June 1995.
Roth, Pulsed Air Jet Flow Definition, Georgia Tech Report GIT AER-EAG-94-8, February 1995.

Unpublished and/or Proprietary Works:

Roth et al, “Engine Technology Identification, Evaluation, and Selection (TIES) Version 4.0 Toolbox: Theoretical Manual, User's Manual, and Code Listing” Software Documentation prepared for GE Aircraft Engines, Nov. 2003.
Roth and Hollingsworth, "Gaussian Process Toolbox, Theory and User's Manual," Software Documentation Prepared for GE Aircraft Engines, May 2003.
Roth et al., "Engine Technology Identification, Evaluation, and Selection (TIES) Toolbox Version 2.1: Theoretical Manual, User’s Manual, and Code Listing," Software Documentation Prepared for GE Aircraft Engines, Oct. 2002.
Roth, B.A., "Sonic Cruiser Propulsion System Analysis," Consultancy, Sept. 2001.
Roth, B.A., Macsotai, N.I., Mavris, D.N., Scaled GE90 Robust Engine Study, Final Report to General Electric Aircraft Engines, Georgia Institute of Technology, Atlanta, GA, Jan. 1998.

Contributions to Other Projects/Proposals:

"Rapid Assessment of Materials and Process Technology for Aircraft Engines," proposal to GE Aircraft Engines, June 2003.
"Thermodynamic Loss Analysis of the Light Medium Tactical Vehicle," proposal to Engineered Machined Products, Inc. March 2003.
"Request for Assignment: P-51 Red Nose, S/N 44-73843" proposal to Aircraft Assignment Committee, Commemorative Air Force Headquarters, Aug. 2002.
"An Integrated System Approach to Revolutionary Aeropropulsion and Power Technologies," a URETI proposal submitted to NASA Glenn RC, Dec 2001.
"A White Paper on a NASA Aeropropulsion and Power Institute for Multidisciplinary Science, Technology, Engineering, and Integration," a URETI white paper submitted to NASA Glenn RC, June 2001.
"Probabilistic Core Sizing and Cycle Selection for Commercial Aircraft Engines," proposal to NASA Glenn RC, May 2001.
"Revolutionary/Unconventional Aeropropulsion Technology Evaluation through Thermodynamic Work Potential," proposal to NASA Glenn RC, January 2001.
"An Investigation of Applications for Thermodynamic Work Potential to Turboshaft Engine Technology Evaluation," proposal to US Army Aviation & Missile Command, Redstone Arsenal, December 2000.
"Advanced Probabilistic Design Methods for Gas Turbine Power Systems," proposal to GE Power Systems, May 2000.
"Research of Advanced Probabilistic Methods for Propulsion System Design," proposal to NASA Glenn Research Center, June, 1999.
"University Strategic Alliance in Probabilistic and Robust Propulsion Systems Design," proposal to General Electric Aircraft Engines, June, 1999.
"Evolutionary and Revolutionary Methods for the Design of Affordable, Environmentally Friendly Transportation Systems," proposal to the Packard Foundation, March 1999.
Notional UCAV Technology Impact Forecasting Study, US Air Force Research Laboratory, May, 1998.
"Decision-Based Design Methodology for Affordability," proposal to the General Electric Corporation, Mar, 1998.
"An Integrated Product and Process Development Approach to Environmentally Conscious Design," proposal to the National Science Foundation, October, 1996.