Jim GregoryProfessor, Dept of Mechanical & Aerospace Engineering
Director, Aerospace Research [email protected]
614-292-5024
Safe and Efficient Navigation of UASin the Urban Environment
Overview
• Flight hazards in the urban wind field
• Flying anemometer for measurement of urban wind fields
• Vehicle dynamic response
• Unmanned Aircraft Traffic Management in Ohio
FLIGHT HAZARDS
Urban Wind Fields
4
Isolated Roughness Flow
Wake Interference Flow Skimming Flow
Zajic, D., et al (2011)
Vortex Ring State
• Loss of vehicle control, thrust
• Random, violent pitch and yaw motions (Johnson, 2004)
• Formation of large, unsteady toroidal structure
• Limited descent speed
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Johnson, 2005
FLYING ANEMOMETER
Drone Flights in Gusting Urban Wind Fields: Wake Response
Thorpe et al. AIAA 2018-4218
Sutkowy et al. AHS 74-2018-0135
Flying Anemometer
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A UAV mounted anemometer will be used to acquire high-frequency wind field characteristics
Can be positioned anywhere desired
Thorpe et al. AIAA 2018-4218
Atmospheric Measurements
9 Thorpe et al. AIAA 2018-4218
Atmospheric Measurements
• Building wake survey
– 12-m roof-level
– 5-m leeward side
– Airfield center freestream
• 5-minute/location survey
Atmospheric Measurements
• Distinct increase in large scale turbulent structures in wake of building roof
• Reduction in turbulence intensity in leeward shadow
• 16 Hz spike due to vehicle vibration
VEHICLE RESPONSE
Quadcopter Flight Mechanics
Singhal et al. AHS 75-2019-0391
Quadcopter Flight Mechanics
Singhal et al. AHS 75-2019-0391
Dynamic Maneuvers
Singhal et al. AHS 75-2019-0391
Unmanned Aircraft Traffic Managementfor OhioJim Gregory
Professor, Mechanical and Aerospace EngineeringDirector, Aerospace Research Center
Unmanned Aircraft Traffic Management
Turnkey UTM solution for the US 33 Smart Corridor, and a scalable solution for Ohio.
Active Radar and Spectrum Sensing
R1400 Active Radar
S1200 RF Spectrum Sensor
Passive Radar
• Radar system utilizing existing “illuminators of opportunity”
– No active transmitter (no FCC license necessary)
– Tuned to receive cell, digital TV, radio, etc. signals
– Equivalent performance to active radar systems
• Low-cost, scalable solution
– Simple hardware components
– Distributed processing network
• Fills gaps between active radar coverage areas – critical for statewide implementation of UTM
• Higher risk research, higher reward
UAS Radar Cross Section Measurement
• Develop extensive library of UAS RCS signatures
– Expansion of existing RCS library developed at OSU Electro Science Laboratory
– Multi-band characterization for active and passive radar systems
– Provides truth data for active and passive radar systems
UAS Service SupplierAiRXOS Autonomous Services Platform
Key Integrated Services
• UAV traffic management
• Coordinated airspace management
• Flight and operational authorization
• Conformance monitoring
• Public and private UTM options
• Cyber-secure architecture
• Integrated with non-cooperative detection solution
Summary
• Flight Hazards in the Urban Wind Environment
• Flying Anemometer
• Quadcopter Response
• UTM