Presentation on theme: "ABSOLUTE FLOW CONTROL AVTECH Sweden AB Linköpings University."— Presentation transcript:
ABSOLUTE FLOW CONTROL AVTECH Sweden AB Linköpings University
Jon H. Ertzgaard, AVTECH Sweden AB RNoAF, USAF ETPS Saab Chief Test Pilot and Project Test Manager -J35F Draken-AJ37 Viggen, Saab 340, Saab 2000, man. guided missiles. J39 Gripen Flight Control System CAAChief Test Pilot Saab 340 Certif. SASLine Capt., Instructor, Project Pilot, Headed the AI/Airline A340/A320 Cockpit-Systems Integration Group Cosultant to NASA (Ames), Fokker etc.Saab Friction Tester Håkan Andersson, University of Linköping Master of Science, Comunication and transportation systems
AIR TRAFFIC CONTROL - problem solving of a continuously selfgenerating chaotic situation – ¤DENSITY VARIATIONS ¤ ATC INTERVENTION ¤ STRATEGIC planning – TACTICAL intervention ¤ SLOT TIMES
SEPARATION VIOLATION CONFLICT None – Metered Flow Flow Time Min. separation WASTE
Metered Flow Inbound Flow Time Final approach- ATC Approach Control METERING Conflict Land None-metered Flow Maximum approach flow RWYRWY En-route Minimum landing separation OLD AOC -X
DISTANCE vs TIME 8 NM / minute 2,5 NM / minute NM / minute ? Distance compression
Metered Flow Inbound Flow Time Final approach- FineMETERINGFineMETERING Land RWYRWY En-route Minimum landing separation ATM Flow planning METERING NEW Maximum approach flow AOC
METERED FLOW 4-D NAV 4-D NAV Planning # 4-D NAV 4-D NAV Execution # Optimum flight (Free Flight)
Routes Flown for Trials 33 RTA trial flights conducted by Smiths Aerospace with SAS. Swedish CAA provided undisturbed priority servicing. 17 different flight crews. Smiths Aerospace test conductor in jumpseat with SONY Digital- 8 camcorder.
TRAIL Accurate Time Separation based on Distance and Ground Speed only Tactical Sequencing and Separation tool ATC defined – Flight Crew executed Requires accurate positioning Accuracy equal to or better than 4-D Nav.
Flow – Density Relation to Air-traffic Method – Analogy from Road-traffic R/D – Assumed as 1-dimensional flow – Focus on final approach (traffic stream) Definition of – Critical factors – Max and optimal density
ROAD TRAFFIC FLOW Old problem (1950) Flow models Similarities with Air traffic flow – Precision of a second – Compressible Differences – Need of speed – Leakages of flow
Flow - density Final approach Traffic stream K opt => q max K max = sep. min Resulting Flow, q (veh/hr) Planned Density, k (veh/mi) k opt k max Free flow Forced flow Over saturated flow V max V min q max
Touch down distribution Number of touch downs Touch down separation (time) Sep. min Present system Improved system Reduction of waste
Present ATC control loop PilotAircraft Radar Controller
Improved control loop PilotAircraft High accuracy A/C position ADS-B Controller F(t) F(t) = Control law
Automatic control loop Pilot Aircraft GNSS Controller F(t) F(t) = Control law
TRAIL CONTROL LAW Requires relative position and Ground Speed PDI-Controller Input = Time Error Output = Acceleration Required time Time error Air – Air Information Relative Position
STRATEGIC PLANNING based on 4-D navigation CONCEPT 4-D navigation or transition to TRAIL STATEGIC PLANNING based on 4-D navigation information OPTIMUM FLIGHT based on 4-D navigation PLANNING AND EXECUTING A METERED FLOW
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