1) Balakrishna, S. and Jategaonkar, R. V., “Autoregressive Modelling and Damping Evaluation from Random Excitation Response of Structures.” Proceedings of the National Systems Conference, PSG Coimbatore, India, June 1977, pp. B1.1-B1.5.
2) Sundara Murthy, Jategaonkar & S Balakrishna: Dynamic Stability measurements from tunnel unsteadiness excited random response, AIAA-1978-831, 1978.
3) JJ Thibodeaux & S Balakrishna: Automatic Control of 0.3m Cryogenic Test Facility, Journal of Guidance, Control and Dynamics, AIAA0731-5090, 1981.
4) JR Raol, RV Jategaonkar and S Balakrishna: Determination of Model order for Dynamical System, IEEE Journal of Systems, Man and Cybernetics, Vol SMC-12, 1982.
5) S Balakrishna, MS Rajamurthy, JR Raol: Congruent Pitch Motion Cues on Human Activity in Compensatory tracking Experiments, IFAC Journal Automatica, Vol 19, No 6, pp-749-754, 1983.
6) R Jategaonkar & S Balakrishna: Effects of Flap position on Longitudinal Parameters of HFB-320 Aircraft, DFVLR-IB-111-85/15,1985.
7) S.Balakrishna, T Niranjana: A Wind Tunnel Dynamic Flying Study of the Pitching Moment characteristics of the SDM model in active Control, AIAA Atmospheric Flight Mechanics Conference at Monterey, AIAA 87-2626,1987.
8) S Balakrishna, WA Kilgore & JJ Thibodeaux: Control of large Cryogenic Tunnels, 17th AIAA Aerospace Ground Testing Conference, AIAA 92-3930,1992
9) Buerhle RD, Young CP, Balakrishna S, & WA Kilgore
Experimental Study of Dynamic interaction between model support structure and high speed Research Model in National transonic facility AIAA-1994-1623
10) W A Kilgore & S Balakrishna: Reduction of Tunnel Dynamics at the National Transonic facility, AIAA-2001-1162, January 2001.
11) WA Kilgore, S Balakrishna, CW Bobbitt & JB Adcock: Recent NTF test process Improvements, AIAA2001-756, January 2001.
12) WA Kilgore, S.Balakrishna, CW Bobbitt & P Underwood
Recent Enhancements to the National Transonic Facility
AIAA-2003-0754, January 2003
13) WA Kilgore, David Chan, S.Balakrishna & J B Adcock
Recent Enhancements to the National Transonic Facility -Mixed Mode Operation
AIAA-2006-0507, Reno, January 2006
14) S Balakrishna, H Houlden, Dh Butler, R white
Development of a wind tunnel active Vibration reduction system
AIAA-2007-961
15) S.Balakrishna , MJ Acheson
Analysis of NASA Common Research Model Dynamic Data
AIAA-2011-1127-444, January 2011
16) Gregory Jones, S.Balakrishna, Joshua Demoss, Scott Goodliff, Matthew Baily Influences of Models on the Unsteady Pressure Characteristics of the NASA National Transonic Facility (invited)
AIAA 2015-1557
17) Scott Goodliff, Gregory Jones, S Balakrishna
Force Measurement Improvements to the National Transonic Facility Sidewall Model Support System
AIAA 2016-0648
18) DT Chan, S Balakrishna, E Walker, Scott Goodliff
Mach Stability Improvements Using an Existing Second Throat Capability at the National Transonic Facility (Invited)
AIAA-20015-0622
19) Melissa Rivers, S Balakrishna; NASA Common Research Model Test Envelope Extension with Active Sting Damping at NTF
AIAA 2014-3135
20) Scott L. Goodliff1, Gregory S. Jones2, Sundareswara Balakrishna3,
David T. Chan4, William E. Milholen, II5, David Butler6, C. Mark Cagle
Force Measurement Improvements to the National Transonic Facility Sidewall Model Support System
AIAA-2015
21) Gregory Jones1, Sundareswara Balakrishna2, Joshua DeMoss3, Scott Goodliff4, Matthew Bailey5
Pressure fluctuations have been measured over the course of several tests in the National
AIAA-2015
21) S.Balakrishna, Ranjan Mooditaya, S nagabhushana
NAL ISRO Acoustic test facility
Sadhana Vol18, Part I march 1993
22) Enhancements to National transonic Facility Semispan force measurement system, KC Lynn, K G Toro, S.Balakrishna, And D Landman, Journal of Aircraft Vol 52, N 6, Nov-December 2015
23) Balakrishna, S., Kilgore, W. A., and Butler, D. A., “Temperature Control of External Balances for Semi-Span Models in Cryogenic Tunnels,” 2nd International Symposium for Strain Gage Balances, 1999.

Education:

• PhD in Engineering, Indian Institute of Science, Bangalore, India, 1976
• BE (BS) in Electrical Engineering, University of Mysore, India, 1960

Management positions held

• Head, Systems Engineering Division, NAL/CSIR, Bangalore, 1982-87
• Head, Flight Mechanics & Control Division, NAL/CSIR, Bangalore, 1989-91

Professional experience

Research and experimental development in modeling Aeronautical and space ground Support facilities at National Aeronautical Laboratory, Bangalore India (1960-1991) Viz.

Modeling and control of aerodynamic processes

• Human pilot modeling in Time domain & Time series
• Blowdown Wind Tunnel control system design/commissioning
• Fatigue testing of full aircraft/ Design-Commissioning
• Flight Simulation & Motion based simulator development,
• Design/establishment of 1100cum 150 db acoustic facility
• Parameter Identification & Flight data analysis (Jaguar, HFB320 etc)
• Multidegree freedom dynamic wind tunnel flow based simulation
• Dynamic Derivative estimation from wind tunnel testing

Cryogenic Wind tunnel and related experimental activities NASA Langley Research Center through Vigyan Inc (1978-80), (1987-89) and 1991 to date

• Thermodynamic Modeling of the 0.3-M TCT at NASA
• Principle Investigator SBIR
  • Modeling and control of Large Cryogenic tunnels Ph 1 (1989-90)
  • Consultant to same project 1991-93 Phase
  • Consultant to Vigyan on Arnold AFB TN 37389-9011 Contract No. FA9101-05-M-0032, SBIR Phase I & II on Active damping in Wind Tunnel Stings

Thermal analysis of NTF water cooling system and its enhancement

NTF IGV hydraulic system thermal issues and design of heating system

NTF Sidewall thermal control

Structural analysis of the NTF high-speed leg vibrations

Turbulence analysis of NTF high-speed leg

MATLAB/SIMULINK modeling of NASA LaRC’s

• UPWT, 14by22, NTF, 8ftTFPT, LTPT, 0.3M TCT etc

Enhancement of NTF Mach no to 1.2

0.3-M TCT adaptive Flexible wall system

NTF Model Protection & Safety System (MPSS) –ISA based

NTF Buffet test system model attitude control

NTF model buffet severity on-line analysis via MPSS

A Stub Sting mounted Vortex Generator Ring for alleviating model wake effects on Arc Sector at NTF

NTF Pathfinder sting damper for NTF113C balance and Sting 1D

NTF CLV Damper design and evaluation at NTF and Ames 11 foot

Design /synthesis of a 25 MBTU cooling coil system for NASA LaRC 14by22
Low speed tunnel

Design /development of DSP based model protection system MPSS
For both NTF and 14by22 and installation as primary safety system

NTF Common research Model (CRM) damper design and evaluation in T213

NTF CRM damper evaluation at -250 F with heated damper

CRM buffet analysis and documentation

Redesign of the Balance Cavity Recirculation system for FASTMAC/ RECEE

T225 data analysis for Mishap Investigation Board (MIB) as subject expert

Testing and recommendations to MIB

Design development of the Model Support Area Protection system (MSAPS)
For MIB and installation

Digital hotwire using DSP Vigyan SBIR I

Redesign of NTF temperature control law using proportional valves and Commissioning

Design development of a cryogenic 70 HP/16000 rpm Permanent Magnet
Motor for open rotor testing at NTF

3MTCT operational envelop development for different customer needs

Design development of a 2 ton Roll damper sting with active roll damping for
AEDC 16T facility

Propeller Tests stand design development for NASA LSAWT as SBIR ph. III

AEDC pitch-yaw damper SBIR Ph I

PI development of 400kW 25000 rpm tail Cone Thruster motor

PI  AEDC pitch Yaw damper for 16T PWT

• NASA Exceptional Engineering achievement Medal, 2015
• AIAA GTTC Best paper AWARDS (ref 20-2015) (ref 14-2007)