SimEnterprise Benefits:Aerospace Use Cases
VI-grade
Agenda
Introducing VI-grade Virtual System Approach for Aircraft Systems including Landing Gear, Flight controls, Stores SeparationSuccess Stories
Why VI-grade?
VI is the maximum climbingdifficulty grade according to
the original Welzenbachscale
“Climbing the peaks of simulation and testing”
VI = Virtual Innovation
Company Mission Statement
VI grade’s mission is to provide solutions for virtual product development to manufacturers of complex mechatronic products, by offering integrated high class simulation software, research and consulting services. „
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Global Sales Coverage of VI-gradeGermany:
Headquarters,Distribution and Services
Italy: Development team
USA:Distribution and Services
Japan:Distribution and Services
Distributors in:KoreaChinaIndiaJapan ScandinaviaUK
VI-grade Software Solutions
Global MSC.Software partner for development and distribution of vertical products based on MSC.ADAMS simulation technology• VI-SportsCar (MSC ADAMS Motorsports, Car and Chassis)
• VI-CarRealTime (MSC ADAMS/Car Realtime)
• VI-Aircraft (MSC ADAMS/Aircraft)
• VI-MotorCycle (MSC ADAMS Motorcycle)
• VI-Rail (MSC ADAMS Rail)
• VI-AutoFlex (MSC ADAMS Autoflex)
• VI-Road
Industry Focus of VI-grade
VI-Sportscar VI-Aircraft
VI-MotorcycleVI-Rail
System Approach to System Approach to Virtual Product Development Virtual Product Development
Components
Subsystem
Systems
AircraftAircraft
VI-Aircraft – System Simulation Environment
Full Aircraft
Airframe Engines Landing Gear Cargo/Stores
Airframe
Aerodynamics
Control Surfaces
Cockpit/Controls
Thrust Forces
Reversers
Engine Controls
Mechanisms
NLG & MLG
Tires
Brakes
Steering
Atmosphere
Pilot
Test Rigs
Runway
Utility Syst.
Passengers Hydraulics
Cargo Fuel
Fuel Tanks HVAC
Weapons Emergency
Performance Noise /Vibration Dur./Damage Safety/Crash
System Approach – Landing GearDesign Virtual Test Lab Validation
Component TestsComponent Tests
SubsystemSubsystem
Full AircraftFull Aircraft
ComponentComponentStress AnalysisStress Analysis
Full A/C SimulationFull A/C Simulation
CorrelationCorrelation
Drop TestsDrop Tests
Flight TestsFlight Tests
Virtual DropVirtual Drop
Landing Gear Issues Solved with VI-Aircraft
Energy requirements including crashVibration coupling during brakingAvoiding shimmy problemsCertification of redesignsSpecification for suppliersDeveloping new efficient designs
VI-Aircraft Landing Gear: Complete Set of Pre-defined Subsystems, Assemblies, Simulations
SimulationsSubsystems Assemblies
Wheel(s)
Brakes
Hydraulics
Control Laws
Airframe
Engine
LGR
Wheel
LGR Structure(w/o wheels)
LGR Dynamics(w/ wheels)
Full Aircraft
Wheel/Tire
Steady Axle Load
DropRetract-Extend
•Attitude•Dyn. Tipback•Taxi & Shimmy•Braking•Turning•Co-Simulation
•Landing•Catapult•Arrestment•Towing•In-flight
• full vehicle
• subsystem
• subsystem
• component
Drop Test Example
1. Create rigid or flexible assembly from library
2. Specify metering pin or orifice settings
3. Specify drop height and impact angles
4. Use spun or stationary tire5. Run “virtual drop” to determine
energy absorbed
Anti-skid Co-Simulation ExampleVI-Aircraft EASY5 or MATLAB
1. Define gear strut (rigid or flex), tire from library2. Specify anti-skid characteristics (EASY5 or MATLAB)3. Use ADAMS/Controls to connect cosimulation4. Determine aircraft accelerations over variety of
conditions
Case Study: VI-Aircraft/DYTRAN IntegrationCase Study: VI-Aircraft/DYTRAN IntegrationSafety: Helicopter Crash Assessment Process
1. Define multibody model in VI-Aircraft to include tire, strut
2. Define fuselage mesh in Dytran3. Run co-simulations for crash
conditions, or export crash loads
Stores Separation Issues Solved with VI-Aircraft
Hydraulic and mechanical sizingClearance and separation studiesSeparation loads and responses
ASEP Subsystem-based Approach
SimulationsSubsystems Assemblies
Wheel(s)
Brakes
Hydraulics
Control Laws
Engine
LGR
Wheel
LGR Structure(w/o wheels)
LGR Dynamics(w/ wheels)
Full Aircraft
Wheel/Tire
Steady Axle Load
DropRetract-Extend
•Dyn. Tipback•Taxi & Shimmy•Braking
•Landing•Catapult•In-flight
• full vehicle
• subsystem
• subsystem
• component
Airframe
StoresFull Aircraft Stores •StoreMotion
•Basic In-flight•Full maneuver
•Simulation•Basic In-flight•Full maneuver•Pit ejection
• full vehicle stores
ASEP Templates
Flexible Parts:(from NASTRAN / ANSYS)
PistonsSwaybraces
Flexible Connections:Airframe attachmentsReleasable lugsSwaybrace padsPiston/Housing bearings
Friction:Piston/Housing bearingsSwaybrace pads
Freeplay:Piston/Housing bearings
Assembly & Automated SimulationComprised of rigid and/or flexible subsystemsReady for automated landing gear and/or store-related simulations
Design Virtual Test Lab Validation
Component TestsComponent Tests
SubsystemSubsystem
Full AircraftFull Aircraft
ComponentComponent
Iron Bird TestsIron Bird TestsVirtual BirdVirtual Bird
Flight TestsFlight Tests
Integrated AnalysisIntegrated Analysis
CorrelationCorrelation
System Approach – Flight Controls
Full A/C SimulationFull A/C Simulation
Flight Controls Issues Solved with VI-Aircraft
High lift device bindingHydraulic and mechanical sizingPilot feel and handling qualitiesSafety and fault toleranceFlight controls efficiency
Full Virtual Prototype of Flap
Summary Benefits of VI-Aircraft + MSC.ADAMS
MSC.ADAMSIndustry standard solver used by all landing gear and major airframe companies
VI-AircraftLower costs for model building – demonstrated factor of 4 improvement Improved model robustness and solution timesBetter efficiency for critical resources, more time on design improvement studiesSystem level approach for aircraft / landing gear / flight controls / stores interactions