STUDYING OF A FORCE EQUALIZATION ALGORITHM FOR TWO ACTUATORS SIMULTANEOUSLY TURNING ASIDE THE FLIGHT CONTROL SURFACE OF NARROW-BODY CIVIL AIRCRAFT
Abstract
Some civil aircraft assume two actuators simultaneously turning aside the flight control surface
(rudder, in some cases aileron or elevator). Thus resulting in onset of the force fighting (mutual
loading force). There are several ways to reduce the mutual loading force. One of them is to insert
specific force equalization algorithm in actuators steering. This article deals with effectiveness of
force equalization algorithm as well as its influence on system “2 active actuators - elevator”. Mathematic model of two actuators on elevator has been formed and tested by the developed testing method
that reproduces the most severe operation conditions. There are several nonlinearities which is
contained in mathematic model: sleeve-travel physical limits, nonlinear effects of fluid foil, rod-travel
physical limits and attachment rigidity. Force equalization algorithm comprises a pressure differential
feedback loop with PID regulator. The results show that force equalization algorithm is highly
efficient (mutual loading force has been reduced over than 90%) in mode test without external load.
However, in test mode with external load it is necessary to introduce a limitation on the magnitude of
the corrective signal so as decrease the rod drop to level specified in terms of reference. Algorithm
has no effect on stability margin of the system. In conclusion, results of this study could also be useful
to expand the test program for two actuators simultaneously turning aside the flight control surfaces
to further simplify the implementation of the force equalization algorithm.
References
popravkami 1-7), p. 25.671 [Aviation regulations. Part 25. Airworthiness standards transport
category airplanes (with amendments 1 to 7), p. 25.671]. Moscow: MAK, 2014.
2. Aleshin B.S., Bazhenov S.G., Didenko Yu.I., Shelyukhin Yu.F. Sistemy distantsionnogo
upravleniya magistral'nykh samoletov [Remote control systems of mainline aircraft]. Moscow:
Izd-vo Nauka, 2013.
3. Rukovodstvo po letnoy ekspluatatsii Airbus A320 FCOM [Airbus A320 FCOM Flight Operation
Manual].
4. Tucker B.G.S. Primary Flight Control System – Philosophy and Implementation, RAeS Conference
– Advanced Avionics on the A330/340 and the Boeing 777, November 1993.
5. Gidravlicheskie privody letatel'nykh apparatov [Hydraulic drives of aircraft], ed. by
V.I. Koreeva. Moscow: Izd-vo Mashinostroenie, 1992.
6. Chen C., Liao P. Fuzzy controller design for positioning and synchronization of electrohydraulic
system, Second IEEE Conference on Industrial Electronics and Applications. Harbin, China,
2007, pp. 971-976.
7. Alekseenkov A.S., Erofeev E.V., Naydenov A.V. Issledovanie silovogo vzaimonagruzheniya
raznorodnykh elektrogidravlicheskikh rulevykh privodov pri ikh sovmestnoy rabote [Investigation
of the power mutual loading of heterogeneous electrohydraulic steering drives when
they work together], Sovremennye naukoemkie tekhnologii [Modern high-tech technologies],
2019, No. 9, pp. 26-30.
8. Lijian Wang, Jean-Charles Mare. A force equalization controller for active/active redundant
actuation system involving servo-hydraulic and electro-mechanical technologies, Proc IMechE
Part G: j of Aerospace Engineering. Toulouse, 2014, Vol. 228 (10), pp. 1768-1787.
9. Waheed Ur Rehman, Wang Shaoping, Wang Xingjian, Fan Lei, Kamran Ali Shah. Motion
synchronization in a dual redundant HA/EHA system by using a hybrid integrated intelligent
control design, Chinese Journal of Aeronautics, 2016, pp. 789-798.
10. Alekseenkov A.S., Ermakov S.A., Konstantinov S.V., Kuznetsov V.E., Obolenskiy Yu.G., Red'ko
P.G. Sistemy elektrogidravlicheskikh rulevykh privodov kompleksov upravleniya potom
samoletov [Systems of electrohydraulic steering drives of aircraft engine control systems],
ed. by d-ra tekhn. nauk, prof. S.V. Konstantinova. Saint Petersburg: Izd-vo SPbGE, 2019.
11. Gus'kov Yu.P., Zagaynov G.I. Upravlenie poletom samoletov [Aircraft flight control.]. Moscow:
Izd-vo «Mashinostroenie», 1991.
12. Steffens M. RRJ Aileron Actuator. Liebherr-Aerospace, 2006.
13. Alekseenkov A.S. Uluchshenie dinamicheskikh svoystv i issledovanie rabochikh protsessov
aviatsionnogo rulevogo gidroprivoda s kombinirovannym regulirovaniem skorosti pri
uvelichenii vneshney nagruzki: diss. … kand. tekhn. nauk [Improvement of dynamic properties
and study of operational processes of an aircraft hydraulic steering drive with combined
speed control with an increase in external load: cand. of eng. sc. diss.]: 05.02.02. MAI (NIU).
Moscow, 2014, 144 p.
14. Erofeev E., Skryabin A., Steblinkin A., Khaletskiy L. Methodologies and test-rig configurations
for the experimental improvement of flight control actuation systems, Recent Advances in
Aerospace Actuation Systems and Component 2018 Conference proceedings. Toulouse,
France, 2018, pp. 109-116.
15. Roben T., Stumpf E., Grom T., Weber G. An Innovative All-Active Hybrid Actuation System
Demonstrator. American Institute of Aeronautics and Astronautics, 2017.
16. Raymond E.T., Chenoweth C.C. Aircraft Flight Control Actuation System Design», USA, Society
of Automotive Engineers, Inc., 1993.
17. Kuo B. Teoriya i proektirovanie tsifrovykh sistem upravleniya [Theory and design of digital
control systems]. Moscow: Izd-vo «Mashinostroenie», 1986.
18. Kim D.P. Teoriya avtomaticheskogo upravleniya [Theory of automatic control]. Moscow: Izdvo
«Fizmatlit», 2007.
19. Obolenskiy Yu.G. Upravlenie poletom manevrennykh samoletov [Flight control of maneuverable
aircraft]. Moscow: Voenizdat, 2007, pp. 150-208.
20. SAE Aerospace – AS94900 «Flight Control Systems», 2018, pp. 62-63.
