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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. „

“

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