Duane McRuer
Born
Duane Torrance McRuer

(1925-10-25)October 25, 1925
Bakersfield, California, U.S.
DiedJanuary 24, 2007(2007-01-24) (aged 81)
Manhattan Beach, California, U.S.
Alma materCalifornia Institute of Technology (BS, MS)
Occupation(s)Scientist and Engineer
Vehicle Controls Expert
Entrepreneur

Duane Torrance "Mac" McRuer (October 25, 1925 – January 24, 2007) was a scientist, engineer, and expert in aircraft flight and other vehicle controls who cofounded Systems Technology Inc. in 1957. He made many contributions to the theory and practical application of human-machine interaction and control.[1]

Early life and education

McRuer's father, John Torrance McRuer, and his mother, Ruth Inez Bartlett, graduated from Park College in Park City, Missouri in 1910. John later graduated with a master's degree in education from Stanford University, and worked in education throughout his professional life as an instructor and administrator. Ruth developed McRuer's interest in academic pursuits by encouraging him to read and study.

McRuer was born in Bakersfield, and spent the early years of his life in California's Central Valley. His family moved to Los Angeles when he was ten years old, which afforded him close proximity to the various museums at Exposition Park, along with the University of Southern California campus. McRuer was a voracious reader, a habit that made him a polymath.

McRuer served in the US Navy during World War II as a lieutenant, and worked on anti-submarine techniques. He earned a Bachelor of Science degree in Mechanical Engineering in 1945 and a Master of Science degree in Electrical Engineering in 1948, both from the California Institute of Technology.[2][3]

Northrop Corporation

Upon graduation from Caltech, McRuer went to work for the Northrop Corporation.[1] He developed expertise in aircraft flight controls, and made some of the first practical applications of theories developed in academia to hydraulically actuated aircraft. McRuer became the Technology Chief of Flight Controls at the company. He was mentored and befriended by Jack Northrop, a relationship that lasted throughout Northrop's life.

McRuer played a key role in flight control developments for the Northrop N-9M flying wing, an early forerunner of the B-2 Spirit. He also co-invented the sideslip-stability augmenter to reduce Dutch roll,[4] and was one of the first to develop automatic stability systems for aircraft.

Systems Technology Inc.

In 1957 McRuer, his wife Betty, and Northrop engineer Irving Ashkenas co-founded Systems Technology Inc. (STI) in Hawthorne, CA.[5] The company provided research and development consulting to the aircraft and nascent aerospace industries. Later contracts came from both the private and public sector for studies on the interplay of human behavior and a wide variety of dynamical systems. Human-vehicle studies expanded beyond aircraft to include automobiles, trucks, and military vehicles.

STI's reputation for what became known as manual control theory garnered international interest. In 1960 the Franklin Institute awarded McRuer and his coauthor Ezra Krendel its Levy Medal for their studies of human dynamic behavior, in particular the paper "The Human Operator as a Servo System Element".[6] McRuer traveled to speak at professional meetings and symposiums around the world. He retired as president of STI in 1993, but remained chairman of the board.[1] For the 1992–1993 academic year, he served as the Jerome C. Hunsaker Visiting Professor of Aerospace Systems at MIT, and delivered the Mina Martin Lecture "Human Dynamics and Pilot-Induced Oscillations".[7]

Other technical work

McRuers's crossover model is a mathematical description of a dynamical system operated by a human being, and is foundational in the field of human-machine interaction.[8][9][10] The system is typically a vehicle such as an aircraft or automobile. Use of this model led to the design of vehicles with improved performance, safety, and ease of operation. McRuer's books and monographs included "Aircraft Dynamics and Automatic Control," coauthored with Dunstan Graham and Irving Ashkenas.[11] He co-authored "Analysis of Nonlinear Control Systems," also with Graham.[12] His work continues to be cited in modern textbooks on aircraft control.[13]

McRuer was also involved in government and professional service. He was an advisor to NASA on the flight control system of the Space Shuttle. Later, while serving on the NASA Advisory Council, he advised on the redesign of the International Space Station. He chaired a National Research Council study on the phenomenon of pilot induced oscillations, which produced recommendations for improving aircraft safety.[14] He was a longtime member and leader of the Aerospace Control and Guidance Systems Committee (ACGSC), which organizes technical meetings for the field.[15] He was elected to the National Academy of Engineering in 1988 with the citation "For pioneering application of guidance and control theory and to experimental man-machine interactions."[1]

Personal life

McRuer loved the outdoors, and especially the mountains. This interest began during boyhood experiences exploring Yosemite and General Grant (now Kings Canyon) National Parks with family. He joined the Sierra Club in 1962, and was active in the Angeles Chapter, serving as the chair of the Sierra Peaks Section in 1976.[16] By 1985 he had climbed all of the 297 mountains on the Sierra Peaks list, and later climbed the 97 mountains on the Desert Peaks list twice.[17] His pursuit of list finishing included visiting the highest point in every state save for Alaska.

Recognizing the need for better trained hiking and mountaineering leaders, he wrote the Sierra Club Leadership Reference Book, and edited future versions. This work served as a model for the entire Sierra Club, leading to a set of standards to be a Sierra Club Certified Leader. McRuer taught many snow, rock, and navigation training classes.[16]

McRuer and wife Betty had two children, Lara McRuer and Steven Harsey.

Awards and honors

Engineering

Sierra Club

  • 1973 – Phil Bernay's Service Award (Angeles Chapter, Hundred Peaks Section)[16]
  • 1981 – Chester Versteeg Outings Award (Angeles Chapter)[16]
  • 1997 – Oliver Kehrlein Award for Outstanding Leadership (National Organization)[16]
  • 1998 – Lifelong Service Award (Angeles Chapter)[16]
  • 1998 – Leadership Award (Angeles Chapter, Sierra Peaks Section)[16]
  • 1999 – John Backus Leadership Award (Angeles Chapter, Hundred Peaks Section)[16]

Selected publications

Books

  • McRuer DT, Ashkenas IL, Graham D (1974). Aircraft Dynamics and Automatic Control. Princeton, NJ, USA: Princeton University Press. ISBN 9780691630328.
  • Graham D, McRuer DT (1961). Analysis of Nonlinear Control Systems. New York, NY, USA: John Wiley.

Patents

  • Flight control system, (1958).[20]
  • Sideslip stability augmenter, (1958).[4]
  • Longitudinal stability augmenter, (1960).[21]
  • Apparatus for measuring operator performance, (1969).[22]

Papers

Reports

References

  1. 1 2 3 4 5 National Academy of Engineering. "Mr. Duane T. McRuer".
  2. 1 2 Caltech Mechanical and Civil Engineering. "Distinguished Alumni".
  3. ↑ "Duane T. McRuer". National Academies Press. Retrieved March 22, 2022.
  4. 1 2 US 2833495, Feeney, Thomas A.; McRuer, Duane T. & Kulda, Richard J. et al., "Sideslip stability augmenter", published 1958-05-06, assigned to Northrop Aircraft Inc.
  5. ↑ Systems Technology Inc. "A Tribute to Duane T. McRuer".
  6. 1 2 The Franklin Institute Awards (13 January 2014). "Duane T. McRuer".
  7. ↑ Murman EM, Hastings DE, et al. (1993). Reports to the President for the Year Ended June 30, 1993 (Report). MIT. hdl:1721.3/59072.
  8. ↑ Lone M, Cooke A (2014). "Review of pilot models used in aircraft flight dynamics". Aerospace Science and Technology. 34: 55–74. doi:10.1016/j.ast.2014.02.003.
  9. ↑ Xu S, Tan W, Efremov AV, Sun L, Qu X (2017). "Review of control models for human pilot behavior". Annual Reviews in Control. 44: 274–291. doi:10.1016/j.arcontrol.2017.09.009.
  10. ↑ Scibilia A, Pedrocchi N, Fortuna L (2022). "Human control model estimation in physical human-machine interaction: A survey". Sensors. 22 (5): 1732. Bibcode:2022Senso..22.1732S. doi:10.3390/s22051732. PMC 8914850. PMID 35270878.
  11. ↑ McRuer DT, Ashkenas IL, Graham D (1974). Aircraft Dynamics and Automatic Control. Princeton, NJ, USA: Princeton University Press. ISBN 9780691630328.
  12. ↑ Graham D, McRuer DT (1961). Analysis of Nonlinear Control Systems. New York, NY, USA: John Wiley.
  13. ↑ Stevens BL, Lewis FL, Johnson EN (2016). Aircraft Control and Simulation (3rd ed.). Hoboken, NJ, USA: John Wiley & Sons. ISBN 978-1-118-87099-0.
  14. ↑ National Research Council (1997). Aviation Safety and Pilot Control: Understanding and Preventing Unfavorable Pilot-Vehicle Interactions (Report). Washington, DC, USA: National Academies Press. doi:10.17226/5469. ISBN 978-0-309-05688-5.
  15. ↑ Aerospace Control and Guidance Systems Committee. "ACGSC History".
  16. 1 2 3 4 5 6 7 8 Sierra Club, Angeles Chapter (5 December 2011). "Great Leaders".
  17. ↑ Sierra Club, Angeles Chapter, Sierra Peaks Section (21 October 2016). "List Completions".{{cite web}}: CS1 maint: multiple names: authors list (link)
  18. ↑ SAE International. "SAE Aerospace Engineering Leadership Award".
  19. ↑ American Institute of Aeronautics and Astronautics. "AIAA Honorary Fellows" (PDF).
  20. ↑ US 2833496, McRuer, Duane T.; Kulda, Richard J. & Vogel, Alvin R., "Flight control system", published 1958-05-06, assigned to Northrop Aircraft Inc.
  21. ↑ US 2958483, McRuer, Duane T.; Kulda, Richard J. & Vogel, Alvin R., "Longitudinal stability augmenter", published 1960-11-01, assigned to Northrop Corporation
  22. ↑ US 3483302, Ashkenas, Irving L.; Durand, Tulvio S. & McRuer, Duane T., "Apparatus for measuring operator performance", published 1969-12-09, assigned to Systems Technology Inc.
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