Design of FBW Flight Control Systems for Modern Combat Aircraft Shyam Chetty Former Director, CSIR-NAL Bangalore

Transcription

1 Design of FBW Flight Control Systems for Modern Combat Aircraft Shyam Chetty Former Director, CSIR-NAL Bangalore 1 IIT Dharwad

2 ABOUT TEJAS Smallest, light-weight, supersonic aircraft Designed for multiple roles Fight other aircraft & establish control over airspace: highly agile, light weight, advanced radar, BVR missiles Spying on enemy (reconnaissance): Special Infra red sensors and cameras Bombing in enemy territory: can carry multiple combination of bombs, advanced radar, stealth, fire laser guided bombs Self-defense: Radar warning receivers, chaffs, flares to fool missiles Electronic warfare: electronic counter-measures Over 4500 flights on 27 Aircraft by 26 Pilots 2

3 TEJAS 3 View - Geometry S = 38.4 m 2 b = 8.2 m AR = t/c ~ 3-4 % 50 o 62.5 o MAC = 5.6 m s max = 17.5 o, 27.5 o, 30 o -30 o to +30 o ab max = 60 o -25 o to +25 o L = 13.2 m 3

4 Required Capabilities of Combat Aircraft in Attacking Air Targets 4

5 Required Capabilities of Combat Aircraft in Attacking Ground (Surface) Objects 5

6 Fully Loaded War Machine 6

7 With Laser Guided Bombs for Precision Ground Attack LGB LDP 7

8 CONTROL CONFIGURED VEHICLE (CCV) AERODYNAMICS CONTROL ACT * STRUCTURES PROPULSION * - ACTIVE CONTROL TECHNOLOGY 8

9 SIX Degrees of Freedom of Motion LATERAL YAW AXIAL ROLL VERTICAL PITCH 9

10 Aircraft Primary Controls Rudder ( Yaw ) Engine ( Thrust) Elevator ( Pitch ) Aileron ( Roll ) 10

11 Aircraft Control (Pitch) Elevators Video 11

12 Aircraft Control (Roll) Aileron Aileron Video 12

13 Aircraft Control (Yaw) Rudder Video 13

14 CONVENTIONAL AIRCRAFT 14

15 FLY-BY-WIRE FLIGHT CONTROL Computers + Sensors Actuators 15

16 A Tale of 4 Forces & 2 Ratios 16

17 How Drag is Reduced? 17

18 How is L/D & T/W increased 18

19 Flight Control Laws Brain 19

20 FBW Flight Control Hardware 20

21 DFCC 21

22 ACTUATORS 22

23 SENSORS 23

24 FCS Software Development 24

25 TEJAS FCS OFP SOFTWARE FUNCTIONS REAL TIME EXECUTIVE (SYNCHRONIZATION, SCHEDULING) 25

26 TEJAS IFCS Test Facilities 26

27 Control Law Schematic Glimpses into the exciting world of modern aircraft design 27

28 Human Pilot Modeling & Pilot- Aircraft Coupling Glimpses into the exciting world of modern aircraft design 28

29 Control Law Block Schematic Glimpses into the exciting world of modern aircraft design 29

30 Cockpit Controls HOTAS Hands On Throttle & Stick (30 to 40 functions being controlled) 38

31 HOTAS Stick Grip 39

32 HOTAS Throttle Grip Glimpses into the exciting world of modern aircraft design 40

33 THROTTLE Grip Controls 41

34 Tejas Cockpit aircraft Ergonomics Glass Cockpit Tejas (TD1, TD2 & PV1) Tejas (PV2) 42

35 TEJAS Cockpit Glass Displays Cockpit 43

36 HUD Head Landing Up display Configuration (HUD) 44

37 Helmet Mounted Display Helmet Mounted Display 45

38 Man-Machine Interaction 46

39 Development of Multi Function Autopilot

40 Development of Multi Function Autopilot

41 Longitudinal Autopilot Modes Altitude Hold In this mode aircraft levels out in pitch (longitudinal axis) and altitude at the time level will be remembered and held. Altitude Select Pilot selects an altitude to reach and engages the mode The aircraft climbs or descents to the pilot selected altitude 42

42 Coupled Autopilot Modes Auto Level In this mode the aircraft is leveled out from unusual attitudes or from disorientation Approach Approach mode generates commands To capture and track the Localizer (LOC) To capture and hold the Glide Slope (GS) 36

43 Flight Director 37

44 H / V NAV Mode Selection 31

45 Autopilot Mode / State Transitions

46 The CLAW Design Cycle 48

47 SIMULATION PLATFORMS Engineer In Loop Pilot In Loop Inflight Simulators 49

48 Iron Bird FCS Test Rig 50

49 Iron Bird Facility 51

50 Structural Coupling Rig 52

51 Airframe Structural Modes 53

52 Test & Integration Facilities 54

53 TEJAS Lightning Tests 55

54 Work Centers of LCA Programme 56

55 Industry Participation in LCA Programme 57

56 58

57 Cold Weather Trials at -15 deg C at Leh 59

58 Amidst Majestic Himalayas Video 60

59 Hot Weather +45 deg. C Trials at Jaisalmer 61

60 Wake Clearance 62

61 Air to Air Refueling 63

62 ??? IIT Dharwad 2018